JP2012129715A - Radio communication apparatus, radio transmission method, and reproduction quality evaluation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform the comparative evaluation of effects of multiple kinds of filter processing to be applicable to voice data before compression encoding by the acoustic feeling of reproduction voice.SOLUTION: A radio communication apparatus 1 includes a digital filter unit 11, a compression encoding unit 12, and a radio transmission unit 13. The digital filter unit 11 performs mutually different multiple kinds of filter processing with respect to one kind of voice data (VD1) and generates multiple kinds of processed voice data (e.g. FD1-FD3). The compression encoding unit 12 performs compression encoding with respect to the multiple kinds of processed voice data and generates multiple kinds of encoding data (e.g. ED1-ED3). The radio transmission unit 13 transmits the multiple kind of encoding data by radio, thereby to allow respective analog decoding voices, which are obtained by decoding the multiple kinds of encoding data, to be continuously reproduced in a receiver.

Description

  The present invention relates to wireless communication in which audio data is compression-encoded and transmitted, and more particularly to a method for evaluating a difference in reproduction quality on hearing due to a difference in filter processing applied to audio data.

  A digital wireless communication apparatus (for example, a mobile phone terminal, a PTT (Push To Talk) transceiver) capable of voice communication compresses and encodes an analog voice signal using a voice codec. In general, speech codecs can be broadly classified into three types: a waveform coding method, a vocoder method, and a hybrid method that combines a waveform coding method and a vocoder method.

  The vocoder method and hybrid method characterized by high compression rate are models that model the vocal cords that are the sound source and the human generation structure that includes the components of the vocal tract such as the throat, oral cavity, nasal cavity, tongue, and lips. is there. Since the vocoder method and the hybrid method are specialized for conversational speech (human voice), the reproduction quality of the decoded speech is degraded when a signal on which an acoustic component other than the human voice is superimposed is compression-coded. There is a drawback that is remarkable. Therefore, it is desired that the audio data before compression encoding obtained by sampling the analog audio signal is not affected by noise superimposition or the frequency characteristics of the reception conversion system such as a microphone. Therefore, a configuration is generally adopted in which a digital filter such as a noise cut filter and a frequency equalizer is disposed in front of the compression encoder, and compression encoding is performed after filtering the audio data. The combined compatibility of the characteristics of the digital filter with the quality of noise superimposed on the audio data and the frequency characteristics of the input system affects the reproduction quality of the decoded audio.

  By the way, Patent Document 1 discloses a compression encoding device that processes one data in parallel by a plurality of digital filters, and compresses and encodes one of these filter outputs.

  Patent Document 2 stores, in a memory, compressed and encoded voice data that is wirelessly transmitted to a communication partner apparatus, and stores the compressed and encoded voice data demodulated from a received signal from the communication partner apparatus. A wireless communication apparatus configured to decode and reproduce the compressed and encoded data stored in the memory in response to a user's terminal operation is disclosed.

JP-A-3-270415 JP-A-9-135313

  When configuring a wireless communication device so that the user can set the content of filter processing to be performed on digital audio data before compression encoding, which filter processing is appropriate to determine the filter processing to be applied specifically It is necessary to evaluate whether or not. The evaluation of the filter is generally performed by determining the reproduction quality of the decoded sound based on human hearing. However, when it is desired to compare the effects of each of the plurality of filter processes, the user operates the terminal (wireless communication apparatus) to set the filter process, inputs audio data, performs compression encoding and decompression decoding, and the speaker. It is necessary to repeatedly perform a series of operations for each filter process by listening to the decoded speech output from and evaluating the quality. Therefore, when listening to and comparing reproduced speech based on different filter processing, the terminal operation time for switching the filter processing is required, and the impression of the previously heard speech is diminished, making it difficult to perform accurate comparative evaluation. There is a problem. Also, the reproduction quality evaluation sound input to the microphone is not the same sound data but different sound data for each filtering process even if the user intends to emit the same sound. . That is, there is also a problem that it is difficult to ensure the strictness of the evaluation because the sound data that is the basis of the evaluation is different for each filtering process.

  Because of these problems, there is a problem that it is difficult for a user to compare and evaluate the effects of a plurality of filter processes applicable to audio data before compression encoding based on the audibility of reproduced audio. Note that Patent Documents 1 and 2 described above do not disclose any means for solving the problem.

  The present invention has been made on the basis of the above-mentioned knowledge by the inventor, and makes it possible to easily compare and evaluate the effects of a plurality of filter processes that can be applied to audio data before compression coding by listening to reproduced audio. For the purpose.

  A first aspect of the present invention includes a wireless communication device. The wireless communication apparatus includes a digital filter unit, a compression encoding unit, and a wireless transmission unit. The digital filter unit performs a plurality of different filter processes on one piece of sound data to generate a plurality of processed sound data. The compression encoding unit performs compression encoding on the plurality of processed audio data to generate a plurality of encoded data. Further, the wireless transmission unit wirelessly transmits the plurality of encoded data so that each of the plurality of analog decoded speech obtained by decoding the plurality of encoded data is continuously reproduced in the reception device. .

  In the first aspect of the present invention described above, the audio data may be audio data for reproduction quality evaluation that is transmitted in order to compare and evaluate the effects of the plurality of filter processes based on the audibility of the reproduction audio.

  In the first aspect of the present invention described above, the wireless transmission unit transmits the plurality of pieces of encoded data in response to a user operation on the wireless communication apparatus that instructs the start of transmission of reproduction quality evaluation audio. It may be configured to do.

  In the first aspect of the present invention described above, the wireless communication device may be configured to be switchable between a first operation mode and a second operation mode. The first operation mode is an operation mode for reproduction quality evaluation in which the plurality of filter processes are performed on the audio data and the plurality of encoded data are wirelessly transmitted. The second operation mode is an operation mode for a normal call in which any one of the plurality of filter processes is performed on the voice data and the encoded data is wirelessly transmitted.

  In the first aspect of the present invention described above, the wireless transmission unit may sequentially perform modulation processing on each piece of encoded data included in the plurality of pieces of encoded data and perform wireless transmission in order.

  The wireless communication apparatus according to the first aspect of the present invention described above may further include a first memory capable of simultaneously holding the plurality of encoded data, and the wireless transmission unit May read each encoded data from the first memory and sequentially perform the modulation processing.

  The above-described wireless communication apparatus according to the first aspect of the present invention may further include a microphone, an A / D conversion unit, and a second memory. The A / D conversion unit samples the analog audio signal obtained by the microphone and generates the audio data. The second memory can hold the audio data generated by the A / D converter. In addition, the digital filter unit includes a digital signal processor that sequentially executes each filter process included in the plurality of filter processes on the audio data read from the second memory by switching a filter coefficient setting. You may have.

  In the first aspect of the present invention described above, the radio signal transmitted from the radio transmission unit includes a plurality of first signal sections each modulated by any one of the plurality of encoded data, and gap data. And a second signal section that is modulated and inserted between two adjacent first signal sections.

  The wireless communication apparatus according to the first aspect of the present invention described above reads out the plurality of pieces of encoded data from the first memory capable of simultaneously holding the plurality of pieces of encoded data, You may further provide the reproduction | regeneration processing part which performs a digital-analog conversion process and outputs each of the obtained some analog decoded audio | voice to a speaker continuously.

  The wireless communication apparatus according to the first aspect of the present invention described above includes the wireless communication among the plurality of pieces of encoded data held in the first memory capable of simultaneously holding the plurality of pieces of encoded data. It may further include a reproduction processing unit that reads out an arbitrary one designated by a user operation on the device, performs decompression decoding processing and digital-analog conversion processing, and outputs the obtained analog decoded audio to a speaker.

  A second aspect of the present invention includes a wireless communication device. The wireless communication apparatus includes a digital filter unit, a compression encoding unit, a wireless transmission unit, a memory, and a reproduction processing unit. The digital filter unit performs a filtering process on the audio data to generate processed audio data. The compression encoding unit performs compression encoding on the processed audio data to generate encoded data. The wireless transmission unit wirelessly transmits the encoded data. In the memory, the digital filter unit performs a plurality of different filter processes on the audio data to generate a plurality of processed audio data, and the compression encoding unit compresses each of the plurality of processed audio data. A plurality of encoded data generated by encoding can be held. The reproduction processing unit reads the plurality of encoded data from the memory, performs decompression decoding processing and digital-analog conversion processing, and outputs each of the obtained plurality of analog decoded speech to a speaker continuously.

  In the second aspect of the present invention described above, the reproduction processing unit is configured to continuously generate a plurality of analog decoded voices triggered by a user operation on the wireless communication apparatus that instructs to start reproduction of reproduction quality evaluation voices. May be played back.

A third aspect of the present invention includes a wireless transmission method. The method includes the following steps (a) to (c).
(A) performing a plurality of different filter processes on one audio data to generate a plurality of processed audio data;
(B) performing a compression encoding on the plurality of processed speech data to generate a plurality of encoded data; and (c) each of a plurality of analog decoded speech obtained by decoding the plurality of encoded data. A step of wirelessly transmitting the plurality of encoded data so as to be continuously reproduced in a communication partner apparatus;

  In the third aspect of the present invention described above, the method generates the plurality of processed audio data in response to accepting a user operation on the wireless communication apparatus instructing to start transmission of reproduction quality evaluation audio. The method may further include generating the plurality of pieces of encoded data and starting an operation mode for reproduction quality evaluation including wireless transmission of the plurality of pieces of encoded data.

The fourth aspect of the present invention includes a reproduction quality evaluation method. The method includes the following steps (a) to (e).
(A) performing a plurality of different filter processes on one piece of audio data to generate a plurality of processed audio data in the transmission device;
(B) In the transmission apparatus, a step of performing compression encoding on the plurality of processed audio data to generate a plurality of encoded data;
(C) a step of wirelessly transmitting the plurality of encoded data in the transmission device;
(D) receiving a radio signal carrying the plurality of encoded audio data in the receiving device; and (e) decoding the plurality of encoded data demodulated from the radio signal in the receiving device. Outputting each of a plurality of obtained analog decoded sounds to a speaker continuously.

  According to each aspect of the present invention described above, a plurality of analog decodings obtained by compressing and encoding a plurality of processed audio data obtained by performing different filter processes on one audio data and further decompressing and decoding the same. Audio can be played continuously. For this reason, the user can continuously listen to a plurality of analog decoded voices having different filter processes applied before compression encoding. Further, since a plurality of filter processes are performed using the same input voice (one voice data), it is possible to suppress evaluation fluctuation due to a difference in input voice. Therefore, according to each aspect of the present invention, it is possible to easily compare and evaluate the effects of a plurality of filter processes that can be applied to audio data before compression encoding by listening to the reproduced audio.

It is a block diagram which shows the structural example of the radio | wireless communication apparatus which concerns on Embodiment 1 of this invention. 3 is a flowchart showing a procedure for transmitting audio for reproduction quality evaluation by the wireless communication apparatus shown in FIG. 1. It is a conceptual diagram which shows the structure of the radio signal which carries the audio | voice data for reproduction quality evaluation transmitted from the radio | wireless communication apparatus shown in FIG. It is a block diagram which shows the specific structural example of the radio | wireless communication apparatus which concerns on Embodiment 1 of this invention. 6 is a flowchart showing a procedure for generating a plurality of encoded data by the wireless communication apparatus shown in FIG. 4. 5 is a flowchart showing a sequence of transmitting a plurality of encoded data by the wireless communication apparatus shown in FIG. It is a block diagram which shows the specific structural example of the radio | wireless communication apparatus which concerns on Embodiment 2 of this invention. FIG. 8 is a block diagram showing a sequence of reproducing a plurality of encoded data by the wireless communication apparatus shown in FIG. 7.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. In each drawing, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted as necessary for clarification of the description.

<Embodiment 1 of the Invention>
The wireless communication apparatus 1 according to the present embodiment is based on a difference in filter processing applied to voice data recorded and converted into voice data together with background noise caused by the environmental conditions used by the user of the wireless communication apparatus 1. In order to evaluate the difference in reproduction quality in terms of audibility, a plurality of pieces of processed sound data are generated by performing a plurality of different filter processes on one piece of sound data. And the radio | wireless communication apparatus 1 performs the compression encoding of these some process audio | voice data, and produces | generates several encoding data. Further, the wireless communication device 1 has a plurality of codes so that each of a plurality of analog decoded voices obtained by decoding a plurality of encoded data is continuously reproduced in a wireless communication device on the receiving side (communication partner). Data is transmitted wirelessly.

  When the wireless communication device 1 performs the above-described transmission operation, the receiving-side wireless communication device that has received a wireless signal carrying a plurality of encoded data performs a plurality of analog operations obtained by decompressing and decoding the plurality of encoded data. The decoded voice can be reproduced continuously. For this reason, the user of the receiving-side wireless communication apparatus can continuously listen to a plurality of analog decoded voices having different filter processes applied before compression encoding. In addition, since the wireless communication device 1 performs a plurality of filter processes using the same input sound (single sound data), it is possible to suppress evaluation fluctuation due to a difference in input sound. Therefore, according to the wireless communication apparatus 1, it is possible to easily compare and evaluate the effects of a plurality of filter processes that can be applied to the sound data before compression coding based on the audibility of the reproduced sound.

  Here, “continuous reproduction” of a plurality of analog decoded voices by the wireless communication device on the receiving side (communication partner) does not mean that a plurality of analog decoded voices are strictly reproduced continuously. . For example, a silence interval may be provided between the reproduction of one analog decoded voice and the subsequent reproduction of the analog decoded voice. Further, for example, another voice (for example, a guidance voice indicating a filter type) may be played back between the playback of one analog decoded voice and the subsequent playback of the analog decoded voice. By providing a silent section or reproducing other audio, the boundary of the analog decoded audio becomes clear, so that the user can easily evaluate. In addition, by reproducing the guidance voice indicating the filter type, the user can easily recognize the filter type.

  The wireless communication device 1 may be configured to be able to switch between an operation mode (normal mode) for performing a normal voice call and an operation mode (evaluation mode) for performing voice transmission for reproduction quality evaluation. In the evaluation mode, the wireless communication device 1 generates an audio data by sampling an analog audio signal for evaluation of reproduction quality, performs a plurality of filter processes on the audio data for evaluation, and outputs a plurality of encoded data. Is generated and transmitted wirelessly. On the other hand, in the normal mode, the wireless communication device 1 samples the analog audio signal to generate audio data, performs one filter process (for example, the filter process determined to have the best reproduction quality in the evaluation mode), One encoded data is generated, and this encoded data is transmitted by radio.

  Switching between the normal mode and the evaluation mode may be performed by a user operation on the wireless communication device 1. For example, the wireless communication device 1 performs the above-described transmission operation of a plurality of pieces of encoded data for reproduction quality evaluation in response to reception of an instruction to transmit reproduction quality evaluation audio by a user operation on the wireless communication device 1. Just do it. The user's operation is, for example, input by an operation button (not shown), voice operation using a microphone (not shown), or the like. The wireless communication device 1 has a plurality of user operations based on a two-stage user operation of a first user operation instructing generation of a plurality of encoded data and a second user operation instructing transmission of the plurality of encoded data. The encoded data transmission operation may be performed. Further, the wireless communication device 1 may execute the evaluation mode in the startup process when the wireless communication device 1 is powered on.

  The wireless communication method applied to the wireless communication device 1 and the terminal type of the wireless communication device 1 are not particularly limited. That is, the wireless communication method applied to the wireless communication device 1 may be any of duplex (full duplex), half duplex, and simplex. Further, the wireless communication device 1 may be, for example, a mobile phone terminal or a transceiver, or may be a transmission-only terminal that does not have a reception function.

  Hereinafter, a specific example of the configuration and operation of the wireless communication device 1 will be described in detail with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration example of the wireless communication device 1. The digital filter unit 11 receives the audio data VD1 and performs a plurality of different filter processes on the audio data VD1 to generate a plurality of processed audio data. In the example of FIG. 1, the digital filter unit 11 performs three types of filter processing to generate three processed audio data FD1 to FD3. Note that the number of the plurality of filter processes applied to one piece of reproduction quality evaluation audio data VD1 may be two or more, and the number of filter processes is only an example.

  The digital filter unit 11 may be configured using a general-purpose DSP (Digital Signal Processor), or may be configured by dedicated hardware (such as a delay element and a product-sum calculator). Further, the digital filter unit 11 may sequentially generate the processed audio data FD1 to FD3 by sequentially changing the coefficient setting of one digital filter. By adopting such a configuration, it is possible to generate a plurality of processed audio data using a digital filter for performing normal audio transmission. Therefore, there is an advantage that it is not necessary to adopt a redundant configuration for reproduction quality evaluation. is there. However, the digital filter unit 11 may have a configuration in which a plurality of digital filters are arranged in parallel, and may generate the processed audio data FD1 to FD3 in parallel.

  The compression encoding unit 12 generates a plurality of encoded data by performing compression encoding of the plurality of processed audio data. In the example of FIG. 1, the compression encoding unit 12 performs compression encoding of the three processed audio data FD1 to FD3 to generate encoded data ED1 to ED3. The compression encoding unit 12 may sequentially input the processed audio data FD1 to FD3 generated by the digital filter unit 11 and sequentially generate the encoded data ED1 to ED3. By adopting such a configuration, a plurality of processed audio data can be generated using a compression encoding circuit for performing normal audio transmission, so that it is not necessary to employ a redundant configuration for reproduction quality evaluation. There are advantages. However, the compression encoding unit 12 may have a configuration in which a plurality of encoders are arranged in parallel, and may perform compression encoding of the processed audio data FD1 to FD3 input in parallel.

  The wireless transmission unit 13 inputs a plurality of encoded data (three encoded data ED1 to ED3 in the example of FIG. 1), performs modulation, up-conversion to an RF (Radio Frequency) band, power amplification, and the like. The radio signal RS carrying a plurality of encoded data is transmitted from the antenna 14. As described above, the wireless transmission unit 13 generates a wireless signal so that a plurality of analog decoded voices obtained by decoding a plurality of encoded data are continuously reproduced in a device that receives the wireless signal RS. .

  For example, when reproduction processing of encoded data is performed in the order received in the voice channel, such as a normal voice call using a mobile phone terminal, a PTT transceiver, etc., the wireless transmission unit 13 includes a plurality of encoded data. What is necessary is just to perform the modulation processing with respect to ED1-ED3 sequentially, and to carry out wireless transmission in order. As another example, there is a case where data is once stored in a receiving apparatus, such as an MPEG-2 audio elementary stream, and the reproduction order is determined based on reproduction time information given to the audio packet. . In this case, with respect to the encoded data ED1 to ED3, in the compression encoding process by the compression encoding unit 12, a plurality of analog decoded voices decoded from the plurality of encoded data ED1 to ED3 are continuously reproduced. What is necessary is just to give reproduction time information. Then, the wireless transmission unit 13 may wirelessly transmit the encoded data ED1 to ED3 to which the reproduction time information is given so as to be reproduced continuously.

  Next, an example of a procedure for transmitting audio data for reproduction quality evaluation by the wireless communication apparatus 1 shown in FIG. 1 will be described with reference to the flowchart of FIG. In step S101, the digital filter unit 11 performs filter processing using the three types of filter coefficient groups # 1 to # 3 on the audio data VD1, and generates three types of processed audio data FD1 to FD3. In step S102, the compression encoding unit 12 compresses and encodes the processed audio data FD1 to FD3 after the filter processing, and generates encoded data ED1 to ED3. In step S103, the wireless transmission unit 13 performs modulation, up-conversion to the RF band, and signal amplification using the encoded data ED1 to ED3, and transmits the wireless signal RS that carries the encoded data ED1 to ED3.

  FIGS. 3A and 3B are conceptual diagrams showing a configuration example of a radio signal RS carrying audio data for evaluation of reproduction quality. In the example of FIG. 3A, the symbol interval S1 modulated by the encoded data ED1, the symbol interval S2 modulated by the encoded data ED2, and the symbol interval S3 modulated by the encoded data ED3 are strictly continuous. ing. The receiving-side apparatus that has received the radio signal shown in FIG. 3 (a) reproduces the three analog decoded voices strictly in succession. On the other hand, in the example of FIG. 3B, gap intervals G1 and G2 are arranged between the symbol intervals S1, S2, and S3 modulated by the encoded data. The gap section may be a silent section, or may be a section in which a guide voice indicating a filter number is encoded. The apparatus on the receiving side that has received the radio signal shown in FIG. 3B reproduces audio based on the gap interval between reproduction of one analog decoded audio and reproduction of the next analog decoded audio.

  Subsequently, a more specific example of the configuration and operation of the wireless communication apparatus 1 according to the present embodiment will be described below. FIG. 4 is a block diagram illustrating a configuration example when the wireless communication device 1 is a simplex (PTT) transceiver. In the configuration example of FIG. 4, the A / D converter 102 generates the audio data VD <b> 1 by sampling the analog audio signal collected by the microphone 100 and the microphone amplifier 101. The audio data VD1 is stored in the audio data memory 103.

  In the configuration example of FIG. 4, the digital filter unit 11 is configured using a DSP. Filter coefficient settings (filter coefficient groups # 1 to # 3) for generating the processed audio data FD1 to FD3 are stored in the filter coefficient memory 104. The digital filter unit 11 repeatedly reads out the audio data VD1 from the audio data memory 103 and sequentially uses the filter coefficient groups # 1 to # 3 held in the filter coefficient memory 104 to generate processed audio data FD1 to FD3.

  The compression encoding unit 12 sequentially acquires the processed audio data FD1 to FD3, performs compression encoding, and generates encoded data ED1 to ED3. The encoded data ED1 to ED3 are stored in the encoded data memory 105.

  In the configuration example of FIG. 4, the wireless transmission unit 13 includes a modulation unit 131 and a transmission RF unit 132. The modulation unit 131 sequentially reads the encoded data ED1 to ED3 from the encoded data memory 105, performs modulation processing in the intermediate frequency band, and generates a modulated signal. The transmission RF unit 132 up-converts the modulated signal into an RF band to generate a radio signal RS, performs signal amplification, and supplies the signal to the antenna 14. The wireless transmission unit 13 may be a direct conversion method that directly modulates an RF signal with encoded data.

  The switch 106 is arranged for switching transmission / reception of the simplex transceiver, and operates in conjunction with a PTT button (not shown). That is, the switch 106 connects the wireless transmission unit 13 to the antenna 14 when the user presses the PTT button for transmission, and connects the wireless reception unit 107 to the antenna 14 when the PTT button is not pressed. .

  A reception signal processing system from the wireless reception unit 107 to the speaker 113 is arranged to reproduce audio received from the communication partner apparatus. The radio reception unit 107 includes a reception RF unit 108 and a demodulation unit 109. The reception RF unit 108 amplifies the received signal, down-converts it, converts it into a digital signal, and supplies it to the demodulation unit 109. Demodulation section 109 performs demodulation processing on the received signal.

  The decompression decoding unit 110 decompresses and decodes the received audio data from the demodulated encoded data. The received audio data is returned to an analog signal by the D / A converter 111. The analog reception signal is amplified by the speaker amplifier 112 and then output from the speaker 113.

  The controller 114 switches between an operation mode in which normal audio transmission is performed (normal mode) and an operation mode in which audio transmission for reproduction quality evaluation is performed (evaluation mode), and according to the operation mode, the digital filter unit 11, The operations of the compression encoding unit 12 and the modulation unit 131 are controlled.

  Subsequently, an operation example of the wireless communication apparatus 1 shown in FIG. 4 from the start of reproduction quality evaluation to the time when the encoded data ED1 to ED3 are stored in the encoded data memory 105 will be described with reference to the flowchart of FIG.

  In step S201, the wireless communication device 1 accepts a user operation that instructs the start of reproduction quality evaluation. In response to the reception of the user operation, in step S202, the controller 114 deletes the data in the audio data memory 103. At this time, the controller 114 may set the filter coefficient group # 1 in the digital filter unit 11. In step S203, the microphone 100 and the microphone amplifier 101 start to acquire an analog audio signal for reproduction quality evaluation. In step S <b> 204, the A / D converter 102 generates an audio data VD <b> 1 by sampling an analog audio signal for reproduction quality evaluation, and stores the audio data VD <b> 1 in the audio data memory 103. The generation processing of the audio data VD1 in steps S203 and S204 may be performed according to the user's audio input operation (for example, PTT button ON).

  In steps S205 to S210, the filter coefficient setting for the digital filter unit 11 is sequentially switched to the filter coefficient groups # 1, # 2, and # 3, and the processed audio data FD1 to FD3 are sequentially generated, and the compression encoding unit 12 performs The encoded data ED1 to ED3 are generated sequentially. The generated encoded data ED1 to ED3 are stored in the encoded data memory 105. By performing the operations in steps S201 to S210, a plurality of pieces of encoded data by a plurality of filter processes can be generated based on a single input audio signal for reproduction quality evaluation.

  Next, a specific example of a sequence of transmitting a plurality of encoded data by the wireless communication apparatus 1 shown in FIG. 4 will be described with reference to the flowchart of FIG. In step S301, the wireless communication device 1 accepts a user operation that instructs to start a series of transmission operations. Note that the wireless communication device 1 automatically performs a series of transmission operations subsequent to the generation processing of the encoded data ED1 to ED3 as shown in FIG. 5 without accepting the explicit instruction of the user shown in step S301. You may start.

  In step S302, the modulation unit 131 sequentially reads the encoded data ED1 to ED3 from the encoded data memory 105, and generates a modulated signal. In step S <b> 303, the transmission RF unit 132 performs up-conversion and signal amplification of the modulated signal, and transmits the radio signal RS from the antenna 14.

<Embodiment 2 of the Invention>
In the present embodiment, a modification of radio communication apparatus 1 according to Embodiment 1 will be described. The wireless communication apparatus 2 according to the present embodiment, like the wireless communication apparatus 1 described above, converts a plurality of pieces of encoded data obtained by performing a plurality of different filter processes on one audio data to the plurality of encoded data. Each of a plurality of analog decoded voices obtained by decoding the encoded data is wirelessly transmitted so that it is continuously reproduced by the receiving apparatus. Further, the wireless communication device 2 is configured to decompress and decode a plurality of pieces of encoded data within the own device and to continuously reproduce each of the obtained plurality of analog decoded voices by the own device.

  FIG. 7 is a block diagram illustrating a configuration example when the wireless communication device 2 is a simplex (PTT) transceiver, similarly to the wireless communication device 1 illustrated in FIG. 4. In the configuration example of FIG. 7, the encoded data ED1 to ED3 stored in the encoded data memory 105 for transmission from the wireless transmission unit 13 is converted into a reproduction processing system (that is, the decompression decoding unit 110 and the D / A converter 111). Is provided with a switch 215. The switch 215 connects the decompression decoding unit 110 to the encoded data memory 105 when the reproduction operation of the reproduction quality evaluation audio is performed in the evaluation apparatus. The operation of the switch 215 is controlled by the controller 214 that switches the operation mode of the wireless communication apparatus 2.

  Similarly to the controller 114 described above, the controller 214 switches the operation mode between the normal mode and the evaluation mode, and the operations of the digital filter unit 11, the compression encoding unit 12, and the modulation unit 131 according to the operation mode. To control. Further, the controller 214 performs the switch 215 and the decompression so that the decompression decoding and the reproduction of the encoded data ED1 to ED3 are started in response to the instruction to reproduce the reproduction quality evaluation sound in its own device. The operation of the decoding unit 110 is controlled.

  Subsequently, a specific example of a sequence of a sequence of reproducing a plurality of encoded data by the wireless communication device 2 shown in FIG. 7 will be described with reference to the flowchart of FIG. In step S401, the wireless communication device 2 accepts a user operation for instructing start of a series reproduction operation. In step S <b> 402, the controller 214 switches the switch 215 in response to accepting a user operation, and connects the decompression decoding unit 110 to the encoded data memory 105. In step S403, the reproduction processing system (that is, the decompression decoding unit 110 and the D / A converter 111) sequentially reads the encoded data ED1 to ED3 and performs decompression decoding and D / A conversion. As a result, three analog decoded audio signals are sequentially generated. In step S <b> 404, the three analog decoded audio signals sequentially generated by the D / A converter 111 are supplied to the speaker amplifier 112, and the three analog decoded audio signals are continuously output from the speaker 113.

  Note that “continuous reproduction” of a plurality of analog decoded voices by the wireless communication device 2 does not mean that a plurality of analog decoded voices are reproduced strictly continuously. For example, a silence interval may be provided between the reproduction of one analog decoded voice and the subsequent reproduction of the analog decoded voice. Further, for example, another voice (for example, a guidance voice indicating a filter type) may be played back between the playback of one analog decoded voice and the subsequent playback of the analog decoded voice. By providing a silent section or reproducing other audio, the boundary of the analog decoded audio becomes clear, so that the user can easily evaluate. In addition, by reproducing the guidance voice indicating the filter type, the user can easily recognize the filter type.

  As described above, in the present embodiment, the plurality of analog decoded voices can be continuously reproduced by the wireless communication device 2 on the transmission side. As a result, the difference in reproduction quality on hearing due to the difference in filter processing can be easily evaluated on the transmission side. For example, even when there is no wireless device on the reception side, it is possible to evaluate the reproduction quality by the user on the transmission side alone using the wireless communication device 2 on the transmission side. In particular, in the case of digital wireless communication, communication deterioration in the wireless transmission path is theoretically small compared to analog wireless communication. Therefore, the evaluation result in the wireless communication device 2 on the transmission side is the same as the evaluation result in the device on the reception side. We can expect no difference.

<Other embodiments>
In the second embodiment of the present invention described above, a plurality of encoded data (ED1 to ED3) obtained by performing a plurality of different filter processes on one piece of reproduction quality evaluation audio data (VD1) is wirelessly transmitted. The configuration in which the wireless communication device 2 performs both the operation and the operation of continuously reproducing a plurality of encoded data (ED1 to ED3) by the own device has been described. However, the wireless communication device 2 may be modified so as to perform only an operation of reproducing by itself without performing an operation of wirelessly transmitting a plurality of encoded data (ED1 to ED3). As described above, in the case of digital wireless communication, it can be expected that the evaluation result on the transmitting side is not different from the evaluation result on the receiving device.

  In the second embodiment of the present invention described above, the operation of sequentially decompressing and decoding a plurality of encoded data (ED1 to ED3) and continuously reproducing a plurality of analog decoded audio signals has been described. However, the wireless communication device 2 reads out any one of the plurality of pieces of encoded data stored in the encoded data memory 105 that is designated by a user operation on the wireless communication device 2, and performs decompression decoding processing and D / A conversion. The processing may be performed so that one obtained analog decoded audio signal is output to the speaker 113.

  Furthermore, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention described above.

DESCRIPTION OF SYMBOLS 1, 2 Wireless communication apparatus 11 Digital filter part 12 Compression encoding part 13 Wireless transmission part 14 Antenna 100 Microphone 101 Microphone amplifier 102 A / D converter 103 Voice data memory 104 Filter coefficient memory 105 Encoded data memory 106 Switch 107 Wireless reception Unit 108 reception RF unit 109 demodulation unit 110 decompression decoding unit 111 D / A converter 112 speaker amplifier 113 speaker 114 controller 131 modulation unit 132 transmission RF unit 214 controller 215 switch

Claims (16)

A digital filter unit that generates a plurality of processed sound data by performing a plurality of different filter processes on one sound data;
A compression encoding unit that performs compression encoding on the plurality of processed audio data to generate a plurality of encoded data;
A wireless transmission unit that wirelessly transmits the plurality of encoded data so that each of a plurality of analog decoded speech obtained by decoding the plurality of encoded data is continuously reproduced in a reception device;
A wireless communication device comprising:   The radio communication apparatus according to claim 1, wherein the audio data is audio data for reproduction quality evaluation transmitted to compare and evaluate the effects of the plurality of filter processes based on the audibility of the reproduction audio.   3. The wireless communication according to claim 1, wherein the wireless transmission unit transmits the plurality of encoded data in response to a user operation on the wireless communication apparatus that instructs to start transmission of audio for reproduction quality evaluation. apparatus. The wireless communication device
A first operation mode for reproduction quality evaluation that performs the plurality of filtering processes on the audio data and wirelessly transmits the plurality of encoded data;
A second operation mode for a normal call in which any one of the plurality of filtering processes is performed on the voice data and the encoded data is wirelessly transmitted;
The wireless communication device according to claim 1, wherein the wireless communication device is configured to be switchable.   The wireless communication device according to claim 1, wherein the wireless transmission unit sequentially performs modulation processing on each piece of encoded data included in the plurality of pieces of encoded data and wirelessly transmits the data sequentially. A first memory capable of simultaneously holding the plurality of encoded data;
The wireless transmission unit reads each encoded data from the first memory and sequentially performs the modulation processing.
The wireless communication apparatus according to claim 5. With a microphone,
An A / D converter that samples the analog audio signal obtained by the microphone and generates the audio data;
A second memory capable of holding the audio data generated by the A / D converter;
Further comprising
The digital filter unit includes a digital signal processor that sequentially executes each filter process included in the plurality of filter processes on the audio data read from the second memory by switching a filter coefficient setting.
The wireless communication apparatus according to claim 1.   The wireless signal transmitted from the wireless transmission unit is modulated by gap data and a plurality of first signal sections each modulated by one of the plurality of encoded data, and two adjacent first signals The wireless communication apparatus according to claim 1, further comprising a second signal section inserted between the signal sections.   A reproduction processing unit that reads the plurality of pieces of encoded data from the first memory, performs decompression decoding processing and digital-analog conversion processing, and continuously outputs each of the obtained plurality of analog decoded sounds to a speaker; The wireless communication apparatus according to any one of claims 7 to 8, wherein the wireless communication apparatus is provided.   An arbitrary analog data obtained by reading any one of the plurality of encoded data held in the first memory designated by a user operation on the wireless communication device and performing a decompression decoding process and a digital-analog conversion process. The wireless communication apparatus according to claim 6, further comprising a reproduction processing unit that outputs the decoded sound to a speaker. A digital filter unit that filters the audio data to generate processed audio data;
A compression encoding unit that performs compression encoding on the processed audio data to generate encoded data;
A wireless transmission unit for wirelessly transmitting the encoded data;
The digital filter unit performs a plurality of different filter processes on the audio data to generate a plurality of processed audio data, and the compression encoding unit performs compression encoding on each of the plurality of processed audio data A memory capable of holding a plurality of encoded data generated by
A reproduction processing unit that reads the plurality of encoded data from the memory, performs decompression decoding processing and digital-analog conversion processing, and continuously outputs each of the obtained plurality of analog decoded speech to a speaker;
A wireless communication device comprising:   12. The wireless communication according to claim 11, wherein the reproduction processing unit performs continuous reproduction of the plurality of analog decoded audio in response to a user operation on the wireless communication apparatus that instructs to start reproduction of audio for reproduction quality evaluation. Communication device. Performing a plurality of different filter processes on one audio data to generate a plurality of processed audio data;
Performing compression encoding on the plurality of processed audio data to generate a plurality of encoded data;
Wirelessly transmitting the plurality of encoded data such that each of a plurality of analog decoded voices obtained by decoding the plurality of encoded data is continuously reproduced in a communication partner device;
A wireless transmission method using a wireless communication device.   14. The wireless transmission method according to claim 13, wherein the audio data is audio data for reproduction quality evaluation that is transmitted in order to compare and evaluate the effects of the plurality of filter processes by listening to the reproduction audio. Triggered by accepting a user operation on the wireless communication device that instructs transmission start of audio for reproduction quality evaluation, generates the plurality of processed audio data, generates the plurality of encoded data, and generates the plurality of encoded data. Starting an operation mode for reproduction quality evaluation including wireless transmission of encoded data;
The wireless transmission method according to claim 13 or 14, comprising: In the transmission device, a plurality of different processing processes are performed on one piece of sound data to generate a plurality of processed sound data,
In the transmission device, a plurality of encoded data is generated by performing compression encoding on the plurality of processed audio data,
In the transmission device, the plurality of encoded data is wirelessly transmitted,
In the receiving device, a radio signal carrying the plurality of encoded audio data is received,
In the receiving device, each of a plurality of analog decoded voices obtained by decoding the plurality of encoded data demodulated from the radio signal is continuously output to a speaker.
Reproduction quality evaluation method.

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