阅读说明：本技术 发送设备、接收设备和收发系统 (Transmitting apparatus, receiving apparatus, and transmitting/receiving system ) 是由 和田存功 于 2021-04-19 设计创作，主要内容包括：本发明提供发送设备、接收设备和收发系统,即,发送设备(100)、与发送设备相对应的接收设备(200)、以及收发系统,包括：第一A/D转换部(120),其将模拟音频信号转换为数字信号；压缩部(130),其对转换后的数字信号进行压缩；调制部(140),其通过对压缩后的数字信号进行调制来生成调制信号；全通滤波器(150),其减少调制信号中所包括的相位失真；以及发送部(160),其发送由于利用全通滤波器减少调制信号的相位失真而产生的相位失真消除信号。(The present invention provides a transmitting device, a receiving device, and a transceiving system, namely, a transmitting device (100), a receiving device (200) corresponding to the transmitting device, and a transceiving system, including: a first A/D conversion unit (120) that converts an analog audio signal into a digital signal; a compression unit (130) that compresses the converted digital signal; a modulation unit (140) which modulates the compressed digital signal to generate a modulated signal; an all-pass filter (150) that reduces phase distortion included in the modulated signal; and a transmission unit (160) that transmits a phase distortion removal signal generated by reducing the phase distortion of the modulated signal using the all-pass filter.)

1. A transmitting device, comprising:

a first A/D conversion section for converting an analog audio signal into a digital signal;

a compression section for compressing the converted digital signal;

a modulation section for generating a modulated signal by modulating the compressed digital signal;

a first all-pass filter for reducing phase distortion included in the modulation signal; and

a transmitting section for transmitting a phase distortion removal signal generated by reducing phase distortion of the modulated signal by the first all-pass filter.

2. The transmitting device of claim 1, further comprising:

a conversion section for converting an input sound into the analog audio signal.

3. The transmission apparatus according to claim 1 or 2, wherein F is the cut-off frequency₀、ω₀＝2πF₀And the Q factor is Q, the first all-pass filter has a characteristic of a transfer function h(s) having an absolute value of 1 as shown in the following equation:

4. a receiving device, comprising:

a receiving section for receiving a modulated signal;

a second a/D conversion section for converting the modulation signal into a digital signal;

a demodulation section for generating a demodulation signal by demodulating the converted digital signal;

an expansion section for expanding the demodulated signal;

a D/a conversion section for converting a signal generated by the expansion section into an analog signal; and

an output section for outputting the analog signal, wherein the reception apparatus further includes at least one of a second all-pass filter provided between the second a/D conversion section and the demodulation section and for reducing phase distortion included in the digital signal converted by the second a/D conversion section, and a third all-pass filter provided between the demodulation section and the extension section and for reducing phase distortion included in the demodulated signal demodulated by the demodulation section.

5. The receiving device of claim 4, wherein F is the cutoff frequency₀、ω₀＝2πF₀And the Q factor is Q, at least one of the second all-pass filter and the third all-pass filter has a characteristic of a transfer function h(s) having an absolute value of 1, as shown in the following equation:

6. a transceiver system, comprising:

a transmitting apparatus, and

a receiving device for receiving the signal transmitted by the transmitting device, wherein,

the transmission device has:

a first A/D conversion section for converting an analog audio signal into a digital signal;

a compression section for compressing the converted digital signal;

a modulation section for generating a modulated signal by modulating the compressed digital signal; and

a transmitting section for transmitting the modulated signal, an

The receiving apparatus has:

a receiving section for receiving the modulated signal;

a second a/D conversion section for converting the modulation signal into a digital signal;

a demodulation section for generating a demodulation signal by demodulating the digital signal converted by the second a/D conversion section;

an expansion section for expanding the demodulated signal;

a D/a conversion section for converting a signal generated by the expansion section into an analog signal; and

an output section for outputting the analog signal, an

Wherein the transceiver system comprises at least one of the following filters:

a first all-pass filter provided between the modulation section and the transmission section and configured to reduce phase distortion included in the modulation signal generated by the modulation section;

a second all-pass filter provided between the second a/D conversion section and the demodulation section and configured to reduce phase distortion included in the digital signal converted by the second a/D conversion section; and

a third all-pass filter provided between the demodulation section and the extension section and configured to reduce phase distortion included in the demodulated signal demodulated by the demodulation section.

7. The transceiving system of claim 6, wherein said transmitting device further comprises a converting section for converting an input sound into said analog audio signal.

8. Transceiving system according to claim 6 or 7, wherein at a cut-off frequency F₀、ω₀＝2πF₀And a Q factor is Q, at least one of the first all-pass filter, the second all-pass filter, and the third all-pass filter has a characteristic of a transfer function h(s) having an absolute value of 1 as shown in the following equation:

Technical Field

The invention relates to a transmitting device, a receiving device and a transceiving system.

Background

A transceiving system is known which transmits a compressed signal which is an audio signal that has been compressed, and restores the audio signal by expanding the received compressed signal (for example, see patent document 1, japanese patent laid-open No. 2015-19146). In addition, it is known that processing such as pre-emphasis (pre-emphasis) or compression is also performed in analog communication. However, it is difficult to accurately perform such processing on an analog signal due to performance degradation caused by a change in components, wiring, temperature change, or the like. Therefore, there is a known method of performing wireless transmission by converting an analog signal into a digital signal, then pre-emphasizing or compressing the digital signal, or the like, and then re-converting the digital signal into an analog signal.

Disclosure of Invention

Problems to be solved by the invention

Such a transceiving system can transmit and receive a modulated signal as a compressed signal that has been modulated. In this case, there is a problem that the phase of the compressed signal becomes nonlinear in modulation and demodulation or the like, and thus the extended audio signal is distorted.

The present invention focuses on this point, and has an object to suppress distortion occurring in an audio signal in a transceiving system that transmits and receives an audio signal by performing modulation and demodulation.

Means for solving the problems

A first aspect of the present invention provides: a transmitting device, comprising: a first A/D conversion section for converting an analog audio signal into a digital signal; a compression section for compressing the converted digital signal; a modulation section for generating a modulation signal by modulating the digital signal after the compression processing; a first all-pass filter for reducing phase distortion included in the modulation signal; and a transmitting section for transmitting a phase distortion removal signal generated by reducing phase distortion of the modulated signal by the first all-pass filter.

The transmitting apparatus may further include a converting section for converting an input sound into the analog audio signal.

At a cut-off frequency of F₀、ω₀＝2πF₀And the Q factor is Q, the first all-pass filter may have a characteristic of a transfer function h(s) having an absolute value of 1 as shown in the following equation:

a second aspect of the present invention provides a receiving apparatus comprising: a receiving section for receiving a modulated signal; a second a/D conversion section for converting the modulation signal into a digital signal; a demodulation section for generating a demodulation signal by demodulating the converted digital signal; an expansion section for expanding the demodulated signal; a D/a conversion section for converting a signal generated by the expansion section into an analog signal; and an output section for outputting the analog signal, wherein the reception apparatus further includes at least one of a second all-pass filter provided between the second a/D conversion section and the demodulation section and for reducing phase distortion included in the digital signal converted by the second a/D conversion section, and a third all-pass filter provided between the demodulation section and the extension section and for reducing phase distortion included in the demodulated signal demodulated by the demodulation section.

At a cut-off frequency of F₀、ω₀＝2πF₀And the Q factor is Q, at least one of the second all-pass filter and the third all-pass filter may have a characteristic of a transfer function h(s) having an absolute value of 1 as shown in the following equation:

a second aspect of the present invention provides a transceiving system, comprising: a transmitting device and a receiving device for receiving a signal transmitted by the transmitting device, wherein the transmitting device has: a first A/D conversion section for converting an analog audio signal into a digital signal; a compression section for compressing the converted digital signal; a modulation section for generating a modulated signal by modulating the compressed digital signal; and a transmitting section for transmitting the modulated signal, and the receiving apparatus has: a receiving section for receiving the modulated signal; a second a/D conversion section for converting the modulation signal into a digital signal; a demodulation section for generating a demodulation signal by demodulating the digital signal converted by the second a/D conversion section; an expansion section for expanding the demodulated signal; a D/a conversion section for converting a signal generated by the expansion section into an analog signal; and an output for outputting the analog signal, and wherein the transceiver system comprises at least one of the following filters: a first all-pass filter provided between the modulation section and the transmission section and configured to reduce phase distortion included in the modulation signal generated by the modulation section; a second all-pass filter provided between the second a/D conversion section and the demodulation section and configured to reduce phase distortion included in the digital signal converted by the second a/D conversion section; and a third all-pass filter provided between the demodulation section and the extension section and configured to reduce phase distortion included in the demodulated signal demodulated by the demodulation section.

The transmitting apparatus may further include a converting section for converting an input sound into the analog audio signal.

At a cut-off frequency of F₀、ω₀＝2πF₀And the Q factor is Q, at least one of the first all-pass filter, the second all-pass filter, and the third all-pass filter may have a characteristic of a transfer function h(s) having an absolute value of 1 as shown in the following equation:

ADVANTAGEOUS EFFECTS OF INVENTION

The present invention achieves the effect of suppressing distortion occurring in an audio signal in a transceiving system that transmits and receives an audio signal by performing modulation and demodulation.

Drawings

Fig. 1 shows a configuration example of a transmission apparatus 100 according to the present embodiment.

Fig. 2 shows an example of the result of phase correction using the all-pass filter 150 according to the present embodiment.

Fig. 3 shows a structural example of the receiving apparatus 200 according to the present embodiment.

Reference numerals

100 transmitting device

110 conversion part

120 first A/D conversion part

130 compression part

140 modulation part

150 all-pass filter

160 transmitting part

162D/A converter

164 first filter

166 first amplifier circuit

168 transmission circuit

200 receiving apparatus

210 receiving part

212 receiving circuit

214 second amplifier circuit

216 second filter

220 second A/D conversion part

230 all-pass filter

240 demodulation unit

250 expansion part

260D/A conversion part

270 output unit

Detailed Description

< structural example of the transmitting apparatus 100 >

Fig. 1 shows a configuration example of a transmission apparatus 100 according to the present embodiment. The transmitting apparatus 100 converts an input sound into an electric signal, modulates the converted electric signal, and transmits it to an external device by radio. The transmission apparatus 100 suppresses nonlinearity of the phase of the electric signal occurring in modulation using a filtering process. The transmission apparatus 100 includes a conversion section 110, a first a/D conversion section 120, a compression section 130, a modulation section 140, an all-pass filter 150, and a transmission section 160.

The conversion section 110 converts an input sound into an analog audio signal. The conversion part 110 converts sound transmitted along with the air vibration into an electric signal. The conversion unit 110 is, for example, a microphone.

The first a/D conversion section 120 converts the analog audio signal converted by the conversion section 110 into a digital signal. The first a/D conversion section 120 has, for example, an a/D converter, and samples the analog audio signal at predetermined intervals. In addition, the first a/D conversion part 120 may first filter the analog audio signal and then convert it into a digital signal. In this case, the first a/D conversion section 120 preferably has a low-pass filter serving as an anti-aliasing filter.

The compression section 130 compresses the converted digital signal converted by the first a/D conversion section 120. The compression section 130 performs compression using techniques such as encoding, pattern recognition, and linear prediction, for example. Since the compression by the compression unit 130 is known as sound compression, a detailed description thereof is omitted here.

The modulation unit 140 generates a modulation signal by modulating the compressed digital signal. The modulation unit 140 generates a modulation signal by, for example, Frequency Modulation (FM). Alternatively, the modulation section 140 may generate a modulation signal by Amplitude Shift Keying (ASK) modulation, Phase Shift Keying (PSK) modulation, Frequency Shift Keying (FSK) modulation, or the like.

The modulation section 140 preferably first converts the frequency of the compressed digital signal and then generates a modulation signal. In this case, the modulation section 140 further includes a frequency conversion circuit. The frequency conversion circuit converts the frequency of the compressed digital signal to a higher frequency. The frequency conversion circuit converts, for example, the frequency of the compressed digital signal into a frequency of a frequency band that can be transmitted by radio.

Such frequency conversion processing and/or modulation by the modulation section 140 may cause nonlinearity in the phase of the digital signal. In addition, analog circuits such as analog filters may cause non-linearity in the phase of the output signal. Such non-linearity of the phase means deterioration of the digital signal before compression, and makes it difficult to transmit the audio signal with high accuracy. Therefore, the transmission apparatus 100 according to the present embodiment corrects such nonlinearity using the all-pass filter 150.

The all-pass filter 150 reduces phase distortion included in the modulated signal generated by the modulation unit 140.

The all-pass filter 150 has a characteristic of a transfer function h(s) having an absolute value of 1 such as shown in the following equation.

Here, assume that the cutoff frequency is F₀，ω₀＝2πF₀And the Q factor (Q factor) is Q.

The transfer function h(s) of the all-pass filter 150 represented by equation 1 represents a second order transfer function, but the all-pass filter 150 may have characteristics of a higher order transfer function. The filter coefficient of the all-pass filter 150 is preferably determined in advance according to the characteristics of the modulation unit 140. Such an all-pass filter 150 may correct the nonlinear phase of the modulated signal to approach a linear phase.

The transmission unit 160 transmits a phase distortion removal signal generated by reducing the phase distortion of the modulation signal by the all-pass filter 150 to an external device. The transmitting section 160 first converts the phase distortion removal signal into an analog signal and then transmits the analog signal. The transmission unit 160 includes, for example, a D/a converter 162, a first filter 164, a first amplifier circuit 166, and a transmission circuit 168.

The D/a converter 162 converts the phase distortion removal signal into an analog signal. The first filter 164 passes analog signal components of a predetermined frequency band within the analog signal converted by the D/a converter 162. For example, the first filter 164 passes analog signal components of a frequency band including information of the sound input to the conversion unit 110. The first filter 164 is, for example, a low-pass filter, and functions as an anti-aliasing filter.

The first amplifier circuit 166 amplifies the analog signal component that has passed through by the first filter 164. The transmission circuit 168 transmits the signal amplified by the first amplifier circuit 166 to an external device. The transmission circuit 168 includes, for example, an LED, and transmits a signal, which is an amplified signal amplified by the first amplifier circuit 166 and converted into an optical signal, as a transmission signal to an external apparatus. In this case, the wavelength of the optical signal is, for example, a wavelength in the infrared region. Alternatively, the transmission circuit 168 has an antenna, and may transmit a signal, which is an amplified signal amplified by the first amplifier circuit 166 and converted into a radio signal, as the transmission signal.

As described above, the transmission apparatus 100 according to the present embodiment transmits to an external device a phase distortion removal signal which is a modulation signal whose nonlinear phase has been corrected to a linear phase by the all-pass filter 150. Accordingly, the receiving apparatus that receives the transmission signal transmitted by the transmitting apparatus 100 can restore the audio signal whose phase distortion has been suppressed by spreading the received signal.

< example of the result of phase correction >

Fig. 2 shows an example of the result of phase correction by the all-pass filter 150 according to the present embodiment. The horizontal axis of fig. 2 represents frequency, and the vertical axis represents phase of a signal. In fig. 2, a broken line indicates the frequency characteristic of a signal having a nonlinear phase. In other words, the broken line is an example of a transmission signal output from a transmission apparatus without the all-pass filter 150.

In contrast, the solid line represents the frequency characteristic of a signal having a nonlinear phase that has passed through the all-pass filter 150. In other words, the solid line is an example of the transmission signal output from the transmission apparatus 100 having the all-pass filter 150. The frequency band in which the frequency characteristic of the phase becomes linear is expanded in the waveform indicated by the solid line as compared with the waveform indicated by the broken line. In this way, the all-pass filter 150 can correct the nonlinear phase of the modulated signal to a linear phase.

The all-pass filter 150 may be disposed on a transmission line of the digital signal, and the all-pass filter 150 is preferably disposed at an output stage side of the transmission line of the digital signal. For example, the all-pass filter 150 is more preferably disposed at the extreme end of the transmission line of the digital signal, such as immediately before the D/a converter 162 of the transmitting section 160m, as shown in the example of fig. 1.

It should be noted that the receiving apparatus may also have a function of correcting such a nonlinear phase to a linear phase instead of or in addition to the transmitting apparatus 100. Next, a receiving apparatus having a correction function will be described.

< structural example of the reception apparatus 200 >

Fig. 3 shows a structural example of the receiving apparatus 200 according to the present embodiment. The receiving apparatus 200 receives the modulated audio signal and restores the audio signal by first demodulating the modulated audio signal and then expanding the demodulated audio signal. The receiving apparatus 200 uses a filtering process to suppress nonlinearity of the phase of the electric signal occurring in modulation and/or demodulation. The reception apparatus 200 includes a reception section 210, a second a/D conversion section 220, an all-pass filter 230, a demodulation section 240, an expansion section 250, a D/a conversion section 260, and an output section 270.

The receiving unit 210 receives the modulated signal. The reception unit 210 receives a modulated signal modulated by frequency modulation, for example. Alternatively, the receiving part 210 may receive a signal modulated using amplitude shift keying, phase shift keying, frequency shift keying, or the like. The receiving unit 210 receives a modulated signal in which nonlinearity occurs in phase due to modulation, for example. In the present embodiment, an example will be explained in which the receiving section 210 receives an optical signal which has a wavelength in the infrared region and has been modulated. The receiving unit 210 includes, for example, a receiving circuit 212, a second amplifier circuit 214, and a second filter 216.

The receiving circuit 212 converts the modulated optical signal into an electrical signal. The receiving circuit 212 has, for example, a photodiode capable of receiving light in the infrared region. Further, in the case where the modulated signal is a radio wave, the receiving circuit 212 has an antenna, and converts the radio wave into an electric signal.

The second amplification circuit 214 amplifies the electric signal converted by the reception circuit 212. The second filter 216 passes an analog signal component of a predetermined frequency band of the electric signal amplified by the second amplifier circuit 214. The second filter 216 passes, for example, an analog signal component in a frequency band including information to be converted into an audio signal by the receiving apparatus 200 of the output stage. The second filter 216 is, for example, a low-pass filter, and functions as an anti-aliasing filter.

The second a/D conversion section 220 converts the modulated signal received by the reception section 210 into a digital signal. The second a/D conversion section 220 converts the analog signal component passed by the second filter 216 into a digital signal.

It should be noted that since the above-described frequency conversion processing and/or modulation has been applied to the modulated signal received by the receiving section 210, there may be a case where the phase of the modulated signal has nonlinearity. In this case, if the modulation signal is converted into an audio signal, sound may be deteriorated. Therefore, the receiving apparatus 200 according to the present embodiment corrects such nonlinearity using the all-pass filter 230.

The all-pass filter 230 reduces phase distortion included in the digital signal converted by the second a/D conversion section 220. The all-pass filter 230 has a characteristic of a transfer function h(s) having an absolute value of 1 as represented by equation 1, for example. The all-pass filter 230 has the characteristics of (i) a second order transfer function or (ii) a third or higher order transfer function. The all-pass filter 230 may correct the nonlinear phase of the modulated signal to approximate a linear phase. The all-pass filter 230 outputs a signal in which the phase distortion of the digital signal converted from the modulation signal has been reduced as a phase distortion removal signal.

The demodulation section 240 demodulates the phase distortion removal signal generated as a result of reducing the phase distortion of the digital signal by the all-pass filter 230 to generate a demodulated signal. For example, when the modulated signal received by the frequency modulation generation receiving unit 210 is used, the demodulating unit 240 performs FM demodulation on the phase distortion removal signal. In addition, when the modulation signal is frequency-converted, the demodulation section 240 converts the frequency into the original frequency.

It should be noted that the frequency conversion processing and/or demodulation by the demodulation section 240 may also cause nonlinearity in the phase of the digital signal. Therefore, the all-pass filter 230 can output the phase distortion removal signal corrected (including correction of nonlinearity occurring in the demodulation section 240). In this case, the parameters of the all-pass filter 230 are preferably predetermined so that both phase distortions are corrected based on both (i) the phase distortion occurring in the demodulation section 240 and (ii) the phase distortion of the modulated signal received by the reception section 210, which are measured in advance. By so doing, even if the demodulation section 240 causes nonlinearity to occur, the demodulation section 240 can output a demodulated signal that has been corrected to be close to a linear phase.

The spreading section 250 spreads the demodulated signal demodulated by the demodulation section 240. The expansion section 250 applies expansion corresponding to the compression that has been applied to the modulated signal received by the reception section 210 to the demodulated signal. Since the expansion performed by the expansion section 250 is also known as sound compression, a detailed description thereof is omitted here.

The D/a conversion section 260 converts the signal generated by the expansion section 250 into an analog signal. The D/a converter 260 includes, for example, a D/a converter. The D/a conversion section 260 may also filter the converted analog signal. In this case, the D/a conversion section 260 preferably has a low-pass filter serving as an anti-aliasing filter.

The output section 270 outputs the analog signal converted by the D/a conversion section 260. The output section 270 outputs an analog signal by, for example, converting the analog signal into sound transmitted along with air vibration. The output unit 270 is, for example, a speaker, an earphone, or the like.

As described above, in the receiving apparatus 200 according to the present embodiment, the all-pass filter 230 corrects the nonlinear phase of the modulation signal to the linear phase. As a result, even if phase distortion occurs in the received modulated signal, the receiving apparatus 200 can restore the audio signal with suppressed phase distortion. In addition, the all-pass filter 230 may correct a nonlinear phase occurring in the demodulation section 240 to a linear phase. Therefore, even if phase distortion occurs in demodulation, the receiving apparatus 200 can recover an audio signal with suppressed phase distortion.

In the above-described embodiment, an example in which the receiving apparatus 200 receives a modulated signal having a nonlinear phase is explained. In this case, the receiving apparatus 200 forms a transceiving system together with a transmitting apparatus without the all-pass filter 150, but is not limited thereto. The receiving apparatus 200 may receive the transmission signal transmitted by the transmitting apparatus 100 described in fig. 1 as a modulated signal. In this case, the transmitting apparatus 100 and the receiving apparatus 200 form a transceiving system.

In such a transceiving system, the phase of the modulated signal received by the receiving apparatus 200 is approximately a linear phase. Accordingly, the filter coefficient of the all-pass filter 230 may be set to correct the nonlinear phase occurring in the demodulation part 240 to a linear phase. By doing so, the transceiving system can accurately propagate and recover the audio signal because the phase distortion occurring in the process of modulating the transmission signal is suppressed by the transmitting apparatus 100, and the phase distortion occurring in the process of demodulating the reception signal is suppressed by the receiving apparatus 200.

In the above description of the reception apparatus 200 according to the present embodiment, an example is shown in which the all-pass filter 230 is provided between the second a/D conversion section 220 and the demodulation section 240, but the reception apparatus 200 is not limited thereto. The all-pass filter 230 may be disposed, for example, between the demodulation section 240 and the extension section 250. As described above, the all-pass filter 230 is more preferably provided at the output stage of the portion where the nonlinearity occurs.

In this case, the demodulation section 240 demodulates the digital signal converted by the second a/D conversion section 220 to generate a demodulated signal. Then, all-pass filter 230 reduces phase distortion included in the demodulated signal demodulated by demodulation section 240. The expansion unit 250 expands the phase distortion removal signal generated by reducing the phase distortion by the all-pass filter 230. Even in such a configuration, the receiving apparatus 200 can restore the audio signal with suppressed phase distortion by correcting the modulation signal with the nonlinear phase. Further, even if phase distortion occurs in demodulation, the receiving apparatus 200 can restore an audio signal with suppressed phase distortion.

An example in which one all-pass filter is provided in the transmitting apparatus 100 and/or the receiving apparatus 200 is explained in the transmitting and receiving system according to the present embodiment, but the present invention is not limited thereto. For example, a plurality of all-pass filters 150 may be provided in the transmitting apparatus 100. Also, a plurality of all-pass filters 230 may be provided in the receiving apparatus 200.

The transceiving system according to the present embodiment can transmit sound by radio and restore the inputted sound at a position distant from the inputted sound. Such a transmitting and receiving system can be used as, for example, a karaoke machine, a conference system, a real-time audio transmission system, or the like.

At least a part of the transceiving system according to the above embodiment is preferably formed of an integrated circuit or the like. For example, the transceiver system may include a Field Programmable Gate Array (FPGA), a Digital Signal Processor (DSP), and/or a Central Processing Unit (CPU).

In the case where at least a part of the transmission/reception system is formed of a computer or the like, the transmission/reception system includes a storage unit. The storage unit includes, for example, a Read Only Memory (ROM) that stores a Basic Input Output System (BIOS) or the like of a computer or the like that implements the audio signal processing device 10, and a Random Access Memory (RAM) that serves as a work area. In addition, the storage unit may store various information including an Operating System (OS), an application program, and/or a database referred to when the application program is executed. That is, the storage unit may include a large-capacity device such as a Hard Disk Drive (HDD) and/or a Solid State Drive (SSD). A processor such as a CPU functions as a transmitting and receiving system by executing a program stored in a storage unit.

The invention is illustrated on the basis of an exemplary embodiment. The technical scope of the present invention is not limited to the scope explained in the above embodiments, and various changes and modifications may be made within the scope of the present invention. For example, all or part of the device may be configured to be functionally or physically dispersed and integrated in any unit. Further, a new exemplary embodiment generated by any combination of these exemplary embodiments is included in the exemplary embodiments of the present invention. The effect of the new embodiment produced by the combination has the effect of the original embodiment together.