阅读说明：本技术 显示装置 (Display device ) 是由 黃善晧 林庆律 李寅揆 于 2021-01-14 设计创作，主要内容包括：一种可拆卸显示装置包括：主机盒,该主机盒包括麦克风和主处理器；以及显示器,该显示器包括放大器和扬声器,该放大器被配置为放大从主处理器接收的音频信号,扬声器被配置为将经放大的音频信号转换为声音并输出声音。主处理器被配置为基于由主处理器输出的音频信号、均衡信息和音量信息对音频信号执行声学回声消除AEC。(A detachable display device includes: a main chassis including a microphone and a main processor; and a display including an amplifier configured to amplify an audio signal received from the main processor and a speaker configured to convert the amplified audio signal into sound and output the sound. The main processor is configured to perform acoustic echo cancellation AEC on the audio signal based on the audio signal, the equalization information, and the volume information output by the main processor.)

1. A detachable display device, comprising:

a main chassis including a microphone and a main processor; and

a display including an amplifier configured to amplify an audio signal received from the main processor and a speaker configured to convert the amplified audio signal into sound and output the sound,

wherein the main processor is configured to perform Acoustic Echo Cancellation (AEC) on the audio signal based on the audio signal, equalization information, and volume information output by the main processor.

2. The detachable display device according to claim 1, wherein the equalization information includes a degree of amplification or a degree of attenuation of a specific frequency band of the audio signal, and

wherein the volume information includes a degree of amplification of the amplitude of the audio signal.

3. A detachable display device according to claim 2, wherein the equalization information and the volume information are information on the amplifier, and

wherein the main processor is configured to store the equalization information and the volume information in advance.

4. The detachable display device of claim 2, wherein the main processor is configured to:

amplifying or attenuating the specific frequency band of the audio signal by using the equalization information; and is

Adjusting the amplitude of the audio signal by using the volume information.

5. The detachable display apparatus according to claim 4, wherein the main processor is configured to copy the audio signal having the adjusted specific frequency band and the adjusted amplitude, and remove an input audio signal input through the microphone when the copied audio signal is the same as the input audio signal.

6. The detachable display device of claim 1, wherein said host box and said display are configured to communicate by wire or wirelessly.

7. The detachable display device of claim 1, wherein the main chassis further comprises a transmitting chip configured to transmit the audio signal to the display, and

wherein the display further comprises a receiving chip configured to receive the audio signal from the transmitting chip.

8. The detachable display device of claim 7, wherein the main processor is configured to:

transmitting the audio signal to the transmitting chip by an integrated inter-chip sound I2S standard; and is

Acquiring the audio signal output by the main processor by connecting a pin outputting the audio signal back to the main processor.

9. The removable display apparatus of claim 1, wherein the microphone is configured to receive a wake-up word for activating a voice function of the removable display apparatus.

10. A detachable display device, comprising:

a main chassis including a microphone and a main processor; and

a display including an amplifier configured to amplify an audio signal received from the main processor and a speaker configured to convert the amplified audio signal into sound and output the sound,

wherein the main processor further comprises a pre-processing amplifier identical to the amplifier and is configured to perform acoustic echo cancellation, AEC, on a pre-processed audio signal, the pre-processed audio signal being an output of the pre-processing amplifier for the audio signal.

11. The removable display apparatus of claim 10, wherein the pre-processing amplifier is configured to output a same feedback signal as an output audio signal output by the amplifier.

12. The detachable display device according to claim 10, wherein the main processor is configured to perform communication through a data line (SDA) and a clock line (SCL) for synchronization of communication with the amplifier and the pre-processing amplifier.

13. A method of operating a detachable display apparatus including a main chassis and a display, the method comprising the steps of:

sending an audio signal to the display through the host box;

amplifying the audio signal received from the main chassis through an amplifier included in the display;

converting the amplified audio signal into sound through a speaker included in the display and outputting the sound; and

performing, by the host box, Acoustic Echo Cancellation (AEC) on the audio signal based on the audio signal, equalization information, and volume information output by the host box.

14. The operating method of claim 13, wherein the equalization information comprises a degree of amplification or a degree of attenuation of a particular frequency band of the audio signal, and

wherein the volume information includes a degree of amplification of the amplitude of the audio signal.

15. The operating method of claim 14, wherein the equalization information and the volume information are information about the amplifier, and

wherein the main processor is configured to store the equalization information and the volume information in advance.

16. The method of operation of claim 14, wherein the step of performing the acoustic echo cancellation AEC comprises the steps of:

amplifying or attenuating the specific frequency band of the audio signal by using the equalization information; and

adjusting the amplitude of the audio signal by using the volume information.

17. The method of operation of claim 16, wherein the step of performing the acoustic echo cancellation AEC comprises the steps of:

copying the audio signal of which the specific frequency band is adjusted and the amplitude is adjusted; and

removing the input audio signal when the copied audio signal is the same as the input audio signal input through the microphone.

18. The operating method of claim 17, wherein the host box and the display are configured to communicate by wired or wireless means.

Technical Field

The present disclosure relates to a display apparatus, and more particularly, to a detachable display apparatus in which a display is separated from a main box (main box) for controlling the display.

Background

Digital TV services using wired or wireless communication networks are becoming widespread. The digital TV service can provide various services that cannot be provided in the existing analog broadcasting service.

For example, an Internet Protocol Television (IPTV) or a smart TV service, which is one of digital TV services, provides a bidirectional service (bidirectional service) that allows a user to actively select a type of program to be viewed, a viewing time, and the like. The IPTV or smart TV service may provide various additional services (e.g., internet browsing, home shopping, and online games, etc.) based on bidirectionality.

Further, in the conventional TV, a system on a chip (SoC) and an amplifier for audio output are located on the same board. Therefore, there is no problem in the process of performing acoustic echo cancellation (hereinafter referred to as AEC) by the audio output of the amplifier.

However, recently, new display devices employ a detachable display device in which an amplifier for audio output and a main SoC are separated.

In the case of a detachable display apparatus, when the main SoC receives an audio signal output from the amplifier as a feedback signal, AEC may not be normally processed because there is a delay before the feedback signal is transmitted.

Disclosure of Invention

The present disclosure is directed to providing a detachable display apparatus capable of effectively performing Acoustic Echo Cancellation (AEC).

The present disclosure is directed to providing a display device capable of improving remote voice recognition performance.

According to an embodiment of the present disclosure, a display device includes: the main machine box comprises a microphone and a main processor; and a display including an amplifier configured to amplify an audio signal received from the main processor and a speaker configured to convert the amplified audio signal into sound and output the sound, wherein the main processor is configured to perform Acoustic Echo Cancellation (AEC) on the audio signal based on the audio signal, the equalization information, and the volume information output by the main processor.

The equalization information may include a degree of amplification or a degree of attenuation of a specific frequency band of the audio signal, and the volume information may include a degree of amplification of the amplitude of the audio signal.

The equalization information and the volume information may be information on the amplifier, and the main processor may be configured to store the equalization information and the volume information in advance.

The main processor may be configured to amplify or attenuate a specific frequency band of the audio signal by using the equalization information and adjust the amplitude of the audio signal by using the volume information.

The main processor may be configured to copy the audio signal of which the specific frequency band is adjusted and the amplitude is adjusted, and remove the input audio signal when the copied audio signal is the same as the input audio signal input through the microphone.

The main chassis may further include a transmitting chip configured to transmit an audio signal to the display, and the display may further include a receiving chip configured to receive the audio signal from the transmitting chip.

The host processor may be configured to send audio signals to the transmit chip via an integrated inter-chip sound (I2S) standard and to retrieve audio signals output by the host processor by connecting pins outputting the audio signals back to the host processor.

The microphone may be configured to receive a wake-up word for activating a voice function of the display device.

According to another embodiment of the present disclosure, a display device includes: the main machine box comprises a microphone and a main processor; and a display including an amplifier configured to amplify an audio signal received from the main processor and a speaker configured to convert the amplified audio signal into sound and output the sound, wherein the main processor further includes a pre-processing amplifier identical to the amplifier and configured to perform Acoustic Echo Cancellation (AEC) on the pre-processed audio signal, which is an output of the pre-processing amplifier for the audio signal.

The pre-processing amplifier may be configured to output the same feedback signal as the output audio signal output by the amplifier.

The host processor may be configured to perform communication through a data line (SDA) and a Synchronized Clock Line (SCL) for communication with the amplifier and the pre-processing amplifier.

The details of one or more implementations are set forth in the accompanying drawings and the description below. Other features will be apparent from the description and drawings, and from the claims.

Drawings

Fig. 1 is a block diagram illustrating a configuration of a display device according to an embodiment of the present disclosure.

Fig. 2 is a diagram for describing a display apparatus in which a host box having a main SoC and a display are separated according to an embodiment of the present disclosure.

Fig. 3 and 4 are diagrams showing detailed configurations of the detachable display device.

Fig. 5 and 6 are diagrams for describing a feedback signal processing method of a detachable display apparatus according to an embodiment of the present disclosure.

Fig. 7 is a flowchart for describing an operation method of a detachable display apparatus according to an embodiment of the present disclosure.

Fig. 8 is a diagram illustrating a configuration of a detachable display apparatus according to another embodiment of the present disclosure.

Fig. 9 is a diagram for describing an AEC processing method according to another embodiment of the present disclosure.

Fig. 10 is a diagram for describing the I2C communication standard.

Fig. 11 is a diagram illustrating a configuration in which a main SoC and a pre-processing amplifier are connected by an I2C communication standard according to an embodiment of the present disclosure.

Detailed Description

Hereinafter, embodiments related to the present disclosure will be described in detail with reference to the accompanying drawings. The suffixes "module" and "unit" for components used in the following description are assigned or mixed in consideration of the ease of writing the specification, and do not have unique meanings or roles themselves.

The display device according to the embodiment of the present disclosure is, for example, a smart display device in which a computer support function is added to a broadcast reception function. An internet function or the like is added to a video display device mainly having a broadcast receiving function. Thus, the video display device may include an easy-to-use interface such as a writing input device, a touch screen, or a spatial remote control device.

The video display apparatus may be connected to the internet and a computer and perform functions such as e-mail, web browsing, banking or gaming, with the support of wired or wireless internet functions. To perform these various functions, a standardized general-purpose OS may be used.

Fig. 1 is a diagram for describing an audio feedback signal processing procedure of a conventional display apparatus.

Referring to fig. 1, a conventional display device 10 includes a main system on chip (SoC)11, a first amplifier 11, a second amplifier 12, a first speaker 13, a second speaker 14, and a microphone 15.

The host SoC 11 may transmit an audio signal to the first amplifier 11 and the second amplifier 12. In this case, the transmitted audio signal may be a digital signal.

The host SoC 11 may transmit the digital audio signal to the first amplifier 11 and the second amplifier 12 by using an integrated inter-chip sound (I2S) standard.

The I2S standard lines may include lines for asynchronous bidirectional transmission (asynchronous bidirectional transmission), lines for clock signal transmission, and lines for a direction signal called word select (word select).

The first amplifier 11 may amplify a digital audio signal received from the main SoC 11 and transmit the amplified digital audio signal to the first speaker 13.

The second amplifier 12 may amplify a digital audio signal received from the main SoC 11 and transmit the amplified digital audio signal to the second speaker 14.

The main SoC 11 may receive a feedback signal from each of the first amplifier 11 and the second amplifier 12. The feedback signal may be the final signal output from the amplifier to the speaker.

The main SoC 11 may perform Acoustic Echo Cancellation (AEC) based on the feedback signal received from each amplifier.

AEC may denote an algorithm of canceling an echo caused because a sound output from a speaker is input to a microphone as an echo in a state where the speaker and the microphone coexist.

AEC may be processing of removing a feedback signal received from the amplifier from a sound signal received by the microphone 15.

The first speaker 13 may convert the digital audio signal amplified by the first amplifier 11 into a sound wave and output the sound wave.

The second speaker 14 may convert the digital audio signal amplified by the second amplifier 12 into a sound wave and output the sound wave.

The microphone 15 may receive a voice uttered by a user and convert the received voice into an electric sound signal.

Since the conventional display apparatus 1 includes the main SoC 11 and the first and second amplifiers 11 and 12, the conventional display apparatus 1 may perform AEC by a feedback signal output from each amplifier.

Fig. 2 is a diagram for describing a display apparatus in which a host box having a main SoC and a display are separated according to an embodiment of the present disclosure.

Referring to fig. 2, the display device 2 may include a display 20 and a main chassis 30.

The display 20 may display an image. The display 20 may include one or more speakers (not shown) that output sound synchronized with the image.

The main box 30 may be a box including a main SoC controlling the operation of the display 20.

The main housing 30 may include a microphone (not shown) that receives voice uttered by the user.

The display 20 and the main cabinet 30 may be connected to each other by wire or wirelessly.

The main chassis 30 may transmit image data and audio data to the display 20. The display 20 may display an image based on image data received from the main chassis 30 and output a sound through a speaker based on received audio data.

Fig. 3 and 4 are diagrams showing detailed configurations of the detachable display device.

Referring to fig. 3, the detachable display device 2 may include a main chassis 30 and a display 20.

The display 20 may include a display panel (not shown) for displaying an image, one or more amplifiers 21 and 23, and one or more speakers 25 and 27.

Fig. 3 shows that the display 20 comprises two amplifiers and two loudspeakers, but this is only an example. The display 20 may include more amplifiers and more speakers.

The main box 30 may include a main SoC 31 and a microphone 33. Fig. 3 shows that the main chassis 30 includes one microphone, but this is just an example. The main chassis 30 may include more microphones.

The main SoC 31 can transmit the I2S standard digital audio signal to the first amplifier 21 and the second amplifier 23 through the connection cable 26.

The main SoC 31 may transmit a first digital audio signal to the first amplifier 21 through the first connection line 26a, and may transmit a second digital audio signal to the second amplifier 23 through the second connection line 26 b.

The first amplifier 21 may amplify the first digital audio signal and output the amplified first digital audio signal to the first speaker 25.

The first speaker 25 may convert the amplified first digital audio signal into a first sound and output the first sound.

The second amplifier 23 may amplify the second digital audio signal and output the amplified second digital audio signal to the second speaker 27.

The second speaker 27 may convert the amplified second digital audio signal into a second sound and output the second sound.

Thus, in the detachable display apparatus 2, the arrangement position between the main SoC 31 and the amplifier is different. Therefore, the main SoC 31 cannot process the feedback signal output from the amplifier.

That is, when the main SoC 31 receives the feedback signal output from each of the first amplifier 21 and the second amplifier 23 through the connection cable 26, a delay may occur before the feedback signal reaches the main SoC 31. Due to such a delay, the main SoC 31 cannot perform AEC processing by the feedback signal.

Fig. 4 is a diagram for describing signal processing performed inside each of the main chassis 30 and the display 20.

The main box 30 may include a main SoC 31, a transmitting IC (or transmitting chip 35), and two microphones 33a and 33 b.

Referring to fig. 4, the master SoC 31 may transmit Serial Data (SDA) and Serial Clock (SCL) of I2C standard to the transmission IC 35.

The transmitting chip 35 may transmit data to the receiving chip 29 provided in the display 20 by a wired or wireless manner.

The SDA of the I2C standard may be audio data.

The SCL of the I2C standard may be a clock signal used for communication synchronization.

The master SoC 31 may transmit AUD _ SCK, AUD _ LRCH, and AUD _ LRCK to the transmission IC 35.

The AUD _ SCK (continuous serial clock) may be a bit clock (bit clock). AUD _ SCK may be a reference signal for reading a digital audio signal.

The AUD _ LRCH indicates a word clock (word clock) and may include information indicating left or right. When the value of AUD _ LRCH is low, it may be data for left, and when the value of AUD _ LRCH is high, it may be data for right.

The AUD _ LRCK may indicate serial data (audio data). That is, the AUD _ LRCK may indicate audio data to be output to an actual speaker.

The main SoC 31 may receive a voice signal from each of the first and second microphones 33a and 33 b.

The voice signal may correspond to a wake-up word or an action word (action word) uttered by the user.

The wake-up word may be a command for activating a voice recognition function of the display apparatus 2.

The action word may be a command for performing a specific operation of the display apparatus 2 after the voice recognition function is activated. For example, the action word may be a command for channel tuning, menu display, and content search.

The display 20 may include a receiving chip 29, a preamplifier 22, a woofer amplifier 24, and a plurality of speakers 25, 27, 28a, and 28 b.

The receiving chip 29 may receive data from the transmitting chip 35 of the main casing 30 through wired or wireless communication.

The preamplifier 22 may amplify the digital audio signal received from the receiving chip 29 and transmit the amplified digital audio signal to the first speaker 25 and the second speaker 27.

The woofer amplifier 24 may amplify the digital audio signal received from the receiving chip 29 and transmit the amplified digital audio signal to the third speaker 28a and the fourth speaker 28 b.

The receiving chip 29 is I2S standard and may receive a first feedback signal I2S _ AMP1_ FRONT from the pre-amplifier 22 and a second feedback signal I2S _ AMP2_ WF from the woofer amplifier 24.

The first feedback signal I2S _ AMP1_ FRON may be an audio signal output from the pre-amplifier 22, and the second feedback signal I2S _ AMP2_ WF may be an audio signal output from the woofer amplifier 24.

The receiving chip 29 may transmit the first feedback signal I2S _ AMP1_ FRONT and the second feedback signal I2S _ AMP2_ WF to the transmitting chip 35.

The transmitting chip 35 may transmit the first feedback signal I2S _ AMP1_ FRONT and the second feedback signal I2S _ AMP2_ WF received from the receiving chip 29 to the main SoC 31.

That is, the first feedback signal I2S _ AMP1_ FRONT and the second feedback signal I2S _ AMP2_ WF are generated by the display 20 and transmitted to the main box 30.

In this case, a delay occurs due to the time taken for the main SoC 31 to receive the first feedback signal I2S _ AMP1_ FRONT and the second feedback signal I2S _ AMP2_ WF. Therefore, a problem may arise in that AEC cannot be performed.

To solve this problem, in the embodiment of the present disclosure, the audio signal output from the main SoC 31 may be directly used for the processing of the AEC.

Fig. 5 and 6 are diagrams for describing a feedback signal processing method of a detachable display apparatus according to an embodiment of the present disclosure.

The components of the detachable display device 2 of fig. 5 are the same as those of the detachable display device 2 of fig. 3.

However, it is different from fig. 3 in that the feedback signal output from the first amplifier 21 and the feedback signal output from the second amplifier 23 are not transmitted through the connection cable 26.

The main SoC 31 may transmit the first digital audio signal of the I2S standard to the first amplifier 21 through the first connection line 26a, and transmit the second digital audio signal of the I2S standard to the second amplifier 23 through the second connection line 26 b.

The first digital audio signal may be the same as the second digital audio signal.

Meanwhile, the main SoC 31 may acquire the first digital audio signal output by itself as the first feedback signal 1 for AEC processing, and acquire the second digital audio signal as the second feedback signal 2.

The host SoC 31 may perform preprocessing on each feedback signal. Specifically, the main SoC 31 may perform preprocessing on the feedback signal using the amplifier information.

The amplifier information may include equalization information (equalization information) and volume information (volume information). The equalization information may include a degree of amplification or a degree of attenuation of a particular frequency band of the audio signal.

The volume information may include information on an output amplitude of the audio signal.

That is, the volume information may include the degree to which the amplitude of the audio signal is amplified by the amplifier.

The main SoC 31 may amplify or attenuate a specific frequency band of the feedback signal by using the equalization information. Meanwhile, the master SoC 31 may adjust the amplitude of the feedback signal by using the volume information.

That is, the feedback signal preprocessing may be a process of amplifying/reducing a specific frequency band of the feedback signal and adjusting the amplitude of the feedback signal.

More specifically, the feedback signal preprocessing may be a process of reflecting the equalization information and the volume information to the feedback signal in order to make the feedback signal the same as the audio signal output from the actual speaker.

The main SoC 31 may further include an additional pre-processor for pre-processing the feedback signal.

The host SoC 31 may be referred to as a host processor.

The main SoC 31 may perform AEC by using the preprocessed feedback signal. The main SoC 31 may perform AEC by copying (duplicating) the preprocessed feedback signal and removing the copied feedback signal.

In this way, according to the embodiments of the present disclosure, AEC processing can be effectively performed in a detachable display apparatus in which a display and a main chassis are separated. Therefore, the recognition performance of the wake-up word can be prevented from deteriorating.

In fig. 6, the master SoC 31 may perform preprocessing on AUD _ LRCK (audio signal) output by itself.

The master SoC 31 may obtain the AUD _ LRCK by connecting the pin outputting the AUD _ LRCK back to itself.

The master SoC 31 may perform preprocessing on the AUD _ LRCK by using the equalization information and the volume information held in advance by the master SoC 31.

To store the balance information and the volume information, the main SOC 31 may include a memory (not shown). A memory (not shown) may be provided separately from the main SoC 31.

That is, according to the embodiment of fig. 6, the transmitting chip 35 does not receive the feedback signal output from the pre-amplifier 22 or the feedback signal output from the woofer amplifier 24 from the receiving chip 29.

Therefore, it is possible to avoid a situation in which AEC cannot be normally performed according to the transmission delay of the feedback signal.

Fig. 7 is a flowchart for describing an operation method of a detachable display apparatus according to an embodiment of the present disclosure.

Referring to fig. 7, the master SoC 31 acquires equalization information and volume information (S701).

The equalization information and the volume information may be characteristic information of a final output audio signal output by an amplifier provided in the display 20.

The equalization information may include information indicating the degree of amplification or attenuation of a particular frequency band of the audio signal.

The volume information may include information indicating a degree of amplification of the amplitude of the audio signal.

The master SoC 31 acquires the output audio signal generated by itself (S703).

The main SoC 31 may receive the output audio signal again while transmitting the output audio signal to the transmitting chip 35.

The main SoC 31 pre-processes the output audio signal by using the equalization information and the volume information (S705).

The host SoC 31 may amplify or attenuate a specific frequency band of the output audio signal based on the equalization information.

The master SoC 31 may increase or decrease the amplitude of the output audio signal based on the volume information.

The main SoC 31 may pre-process the output audio signal by using the equalization information and the volume information so that the output audio signal is identical to the final output audio signal output to the speaker by the amplifier.

The main SoC 31 may correct a difference between the value of the output audio signal output by itself and the value of the audio signal output by the amplifier using the equalization information and the volume information.

The main SoC 31 performs AEC on the preprocessed output audio signal (S707).

The host SoC 31 may take the pre-processed output audio signal as a feedback signal and replicate the feedback signal.

The main SoC 31 may remove an input signal when the same signal as the copied feedback signal is input through the microphone 33. The treatment may be an AEC.

Fig. 8 is a diagram showing a configuration of a detachable display apparatus according to another embodiment of the present disclosure, and fig. 9 is a diagram for describing an AEC processing method according to another embodiment of the present disclosure.

Referring to fig. 8, the main chassis 30 may include a main SoC 31, a microphone 33, a first pre-processing amplifier 37, and a second pre-processing amplifier 39.

That is, in comparison with the configuration of the main cabinet 30 of fig. 5, the main cabinet 30 of fig. 8 may further include a first pre-processing amplifier 37 and a second pre-processing amplifier 39.

The first and second pre-processing amplifiers 37 and 39 may be used for AEC processing of the audio signal output by the main SoC 31, rather than for outputting the amplified audio signal to a speaker.

The host SoC 31 may control the first pre-processing amplifier 37 and the second pre-processing amplifier 39 through the I2C communication standard.

The I2C communication standard is a standard in which communication is performed by one line for the SDA and two lines for the SCL.

The I2C communication standard will be described below.

The first pre-processing amplifier 37 may have the same characteristics as those of the first amplifier 25. That is, the equalization information and the volume information applied to the first pre-processing amplifier 37 may be the same as the equalization information and the volume information applied to the first amplifier 21.

Therefore, the first audio signal output from the first pre-processing amplifier 37 may be the same as the signal output from the first amplifier 21 to the first speaker 25.

Similarly, the equalization information and the volume information applied to the second pre-processing amplifier 39 may be the same as the equalization information and the volume information applied to the second amplifier 23.

Therefore, the second audio signal output from the second pre-processing amplifier 39 may be the same as the signal output from the second amplifier 23 to the second speaker 27.

The main SoC 31 may copy the first audio signal output from the first pre-processing amplifier 37 and the second audio signal output from the second pre-processing amplifier 39.

When the signal input through the microphone 33 is the same as the first audio signal or the second audio signal, the main SoC 31 may remove the input signal.

Referring to fig. 9, the main SoC 31 generates an audio signal (S901).

The audio signal generated by the main SoC 31 may be a signal transmitted to the first amplifier 21 and the second amplifier 23 provided in the display 20 through the connection cable 26.

Further, the audio signal generated by the main SoC 31 may be a signal sent to the pre-processing amplifiers 37 and 39.

The master SoC 31 transmits the generated audio signal to the preprocessing amplifiers 37 and 39 (S903).

The preprocessing amplifiers 37 and 39 can amplify and output audio signals.

The preprocessing amplifiers 37 and 39 can perform preprocessing on the audio signal. The preprocessing amplifiers 37 and 39 include equalizers by which a specific frequency band of the audio signal is amplified or attenuated.

The preprocessing amplifiers 37 and 39 can amplify the amplitude of the audio signal to a certain degree.

The pre-processing amplifiers 37 and 39 may transmit the pre-processed audio signal in which a specific frequency band and amplitude of the audio signal are adjusted to the main SoC 31.

The preprocessing amplifiers 37 and 39 may be the same amplifiers as the amplifiers 21 and 23 provided in the display 20.

Therefore, the preprocessed audio signals output from the preprocessing amplifiers 37 and 39 may be the same as the audio signals output from the amplifiers 21 and 23 provided in the display 20.

The main SoC 31 performs AEC by using the audio signals of the preprocessed tones output from the preprocessing amplifiers 37 and 39 (S905).

The main SoC 31 may copy the same audio signal as the pre-processed audio signal and may remove the input signal when the same signal as the copied audio signal is input through the microphone 33. The treatment may be an AEC.

In this way, according to the embodiment of the present disclosure, the same signal as the audio signal output by the amplifier provided in the display 20 may be obtained by the pre-processing amplifier provided in the main cabinet 30.

Accordingly, AEC can be performed without receiving a feedback signal from an amplifier provided in the display 20.

Fig. 10 is a diagram for describing an I2C communication standard, and fig. 11 is a diagram showing a configuration in which a main SoC and a pre-processing amplifier are connected by an I2C (Inter Integrated Circuit) communication standard according to an embodiment of the present disclosure.

The I2C communication standard is a standard for communication between a master device (master) and a slave device (slave), and includes two lines SCL and SDA as bidirectional open drain lines (bidirectional open drain lines).

SCL is a clock line for synchronous communication, and SDA is a data line. The master device may output a clock for synchronization to the SCL, and the slave device may output or receive data through the SDA in synchronization with the clock output to the SCL.

The I2C communication standard can only perform half-duplex communication since data is exchanged only over the SDA.

Since both SCL and SDA are open-drain, a pull-up resistor is connected to each line.

Since the master device and all slave devices share the SCL and SDA, the master device can identify the slave devices by their addresses in order to individually designate the slave devices.

In the embodiment of fig. 8, the master SoC 31 becomes a master device, and the first pre-processing amplifier 37 and the first amplifier 21 provided in the display 20 become slave devices.

That is, referring to fig. 11, the main SoC 31 and the first pre-processing amplifier 37 are connected through SCL and SDA, and the main SoC 31 and the first amplifier 21 are also connected through SCL and SDA.

That is, the first amplifier 21 and the first pre-processing amplifier 37 may be connected through the same SCL and SDA.

Similarly, the second amplifier 23 and the second pre-processing amplifier 39 may also be connected by the same SCL and SDA.

In the following, the embodiment applied between the first pre-processing amplifier 37 and the first amplifier 21 may also be applied between the second pre-processing amplifier 39 and the second amplifier 23.

The main SoC 31 may transmit the I2S standard digital audio signal to the first pre-processing amplifier 37 and the first amplifier 21.

The first pre-processing amplifier 37 and the first amplifier 21 may be the same amplifier. However, the first pre-processing amplifier 37 may be an amplifier used only for extracting the feedback signal and not for speaker output purposes.

Since the first amplifier 21 and the first pre-processing amplifier 37 are connected to the main SoC 31 through the same SCL and SDA, a collision may occur. Therefore, the following I2C control method may be used.

In one embodiment, the master SoC 31 may send different addresses to the amplifiers through SCL and SDA in order to distinguish the first pre-processing amplifier 37 from the first amplifier 21.

In another embodiment, the master SoC 31 may assign the same address to the first amplifier 21 and the first pre-processing amplifier 37. In this case, the main SoC 31 may receive ACK from the first amplifier 21 and the first pre-processing amplifier 37. After the main SoC 31 receives the ACK twice, the main SoC 31 may perform AEC on the preprocessed audio signal received from the first preprocessing amplifier 37.

In another embodiment, either one of the first amplifier 21 and the first pre-processing amplifier 37 may be designed not to send an ACK to the master SoC 31.

According to the embodiments of the present disclosure, Acoustic Echo Cancellation (AEC) can be effectively performed even in a detachable display device.

Thus, speech recognition performance (e.g., recognition of a wake word) can be greatly improved.

According to an embodiment of the present disclosure, the above method may be implemented as processor readable code on a medium in which a program is recorded. Examples of the processor-readable medium include ROM, RAM, CD-ROM, magnetic tapes, floppy disks, optical data storage devices, and the like, and may be implemented in the form of a carrier wave (e.g., transmission through the internet).

The above-described display device may not be limited to the configurations and methods applied to the above-described embodiments, but may configure the embodiments by selectively combining all or some of the embodiments, so that various modifications may be made.