JP4894499B2 - Digital radio and control method - Google Patents

Description

  The present invention relates to a digital radio device and a control method for processing audio data by a vocoder or the like.

  Patent Document 1 discloses a wireless communication system that efficiently transmits the same data from a single wireless base station to a plurality of wireless terminals when reception speeds of the wireless terminals vary. In the wireless communication system, the base station first performs broadcast transmission to a terminal having a preset lower limit receiving speed or higher (base station 1 → terminals 2A and 2C in FIG. 8 of Patent Document 1), and the lower limit. For terminals having a receiving speed lower than the receiving speed, transmission is performed separately at an appropriate time later (see paragraph 0026 of “Patent Document 1”, such as “nighttime... Send. ")

  On the other hand, a conventional digital wireless terminal is equipped with a vocoder. The vocoder generates audio data from the microphone audio signal in the transmission mode, and conversely, in the reception mode, reproduces the audio signal from the audio data and sends it to the speaker. It is flowing. In a typical digital wireless terminal, a full rate and a half rate are prepared as voice encoding rates in vocoder processing, and can be switched as appropriate. For example, the full rate is 7200 bps, the half rate is 3600 bps, and the digital wireless terminal has two transmission rates of 4800 bps and 9600 bps, for example.

  In a typical digital wireless terminal, MIC (microphone) input data is divided every 20 ms in the time axis direction. Therefore, the number of bits per hour segment (for example, 20 ms) in the case of the half rate is 72 (= 3600 × 20 ÷ 1000). On the other hand, the number of bits per hour segment (for example, 20 ms) in the full rate is 144 (= 7200 × 20 ÷ 1000).

  On the other hand, when the transmission rate is 4800 bps, a transmission frame having a transmission time of 80 ms per frame is used. When the transmission rate is 9600 bps, a transmission frame having a transmission time of 40 ms per frame is used. The number of bits of an 80 ms transmission frame at a transmission rate of 4800 bps is 384 (= 4800 × 80 ÷ 1000). The number of bits of a 40 ms transmission frame at a transmission rate of 9600 bps is 384 (= 9600 × 40 ÷ 1000).

  FIG. 12 shows the data correspondence between MIC input data and transmission frames when the vocoder speech coding rate and the digital wireless terminal transmission rate are set to a half rate and 4800 bps, respectively. Since the four time segments of the MIC input data, that is, the number of bits for 80 ms (= 288b) are within the number of bits of one transmission frame of 80 ms (= 384b), each segment M1 to M4 of the MIC input data Are stored as voice channels V1 to V4 in one transmission frame of 80 ms, respectively. In the figure, F at the beginning of the transmission frame means a header and includes a synchronization word, a link information channel, and a low-speed information channel. The data is stored in an area after the header area of the transmission frame. In the case of FIG. 12, audio data can be transmitted by storing audio data of corresponding time segments in each transmission frame.

FIG. 13 shows the data correspondence relationship between the MIC input data and the transmission frame when the voice coding rate of the vocoder and the transmission rate of the digital wireless terminal are set to the full rate and 9600 bps, respectively. Since the two sections of the MIC input data, that is, the number of bits for 40 ms (= 288b) fit within the number of bits of one transmission frame of 40 ms (= 384b), each section M1 to M4 of the MIC input data has a time The transmission frames of 40 ms before and after in the axial direction are respectively stored in two sections, that is, in audio channels V1 and V2 and audio channels V3 and V4, respectively. Also in the case of FIG. 13, it is possible to transmit audio data by storing audio data of corresponding time segments in each transmission frame.
JP 2005-151268 A

  FIG. 14 assumes a data correspondence relationship between MIC input data and transmission frames when the vocoder speech coding rate and the digital wireless terminal transmission rate are set to a half rate and 9600 bps, respectively. Since the four sections of MIC input data, that is, the number of bits for 80 ms (= 288b) is within the number of bits of one transmission frame of 40 ms (= 384b), the sections M1 to M4 for 80 ms of MIC input data are , And can be stored as voice channels V1 to V4, respectively, in one transmission frame of 40 ms.

  In this way, another frame of 40 ms can be transmitted within 80 ms separately from the voice frame. Therefore, as shown in FIG. 14, it is advantageous to transmit voice frames and high-speed information frames alternately.

  The high-speed information channel of the transmission frame is set by the microcomputer, but when every other audio frame is created as shown in FIG. 14, the microcomputer has to insert a high-speed information frame between the audio frames. Prior to the insertion, a process for ascertaining the timing of the voice frame and the high-speed information frame is required, which complicates the process.

  The microcomputer on the transmission side may steal the audio channel of the audio frame as appropriate and replace it with a high-speed information channel. The voice channel switched to the high-speed information channel causes a sound break in the receiving vocoder. Further, when processing the stolen audio channel as the audio data of the last frame (repeated) and processing the audio data of the audio channel so as to repeat the audio data immediately before being stolen, all the high-speed information channels are audio. If the channel is treated as being stealed, the high-speed information channel is also mixed with high-speed information frames, so the number of segments of audio data to be reproduced and the number of segments of audio data to be actually reproduced do not match. The sound reproduction.

  Even when an error occurs in the link information channel or the low-speed information channel of the frame, and the receiving side constructs the frame with the wrong frame structure, the same inconvenience as in the case of the lost frame of the high-speed information channel occurs. Arise. Patent Document 1 mentions the transmission speed but does not mention the audio data processing speed.

  An object of the present invention is to provide a non-voice frame without identifying whether or not a section in which a non-voice frame is inserted is a voice frame in a communication period in which a predetermined amount of voice data can be transmitted in a frame having a half transmission time. It is to provide a digital radio and a control method capable of accurately and efficiently inserting a signal between voice frames.

  An object of the present invention is to provide a digital radio and a control method capable of accurately constructing voice data in a receiving unit even when a non-voice channel is included in a voice frame and a non-voice frame.

  When divided into time segments of a predetermined length in the time axis direction, audio data of each time segment is stored in each audio channel of the frame, and the total number N of audio channels in the frame is N, the total of N audio data time segments A communication period in which two frames are transmitted within the time is called a predetermined communication period.

According to the digital radio of the present invention, the transmission unit includes the following.
Audio data generating means for generating audio data;
Non-voice data generating means for generating non-voice data;
First stage frame generating means for generating a first stage frame so that the same voice data is stored in a corresponding voice channel of two voice frames continuous in a time axis direction in a predetermined communication period;
Second stage frame generating means for generating a second stage frame by replacing one voice frame with a non-voice frame dedicated to non-voice data for each of the two first stage frames continuous in the time axis direction, and a second stage Transmission means for transmitting frames in order.

According to the digital radio of the present invention, the receiving unit includes the following.
Frame receiving means for receiving a frame;
In a predetermined communication period, a frame period dividing means for dividing into a voice frame period and a non-voice frame period based on the header of the received frame;
Audio data construction means for discriminating whether each channel of each audio frame period is an audio channel or a non-audio channel replacing the audio channel, and constructing audio data of each audio frame period based on the discrimination, and Audio signal reproduction means for reproducing an audio signal based on audio data.

The digital radio control method of the present invention includes the following steps.
Generating audio data;
Generating non-voice data;
Generating a first stage frame so that the same voice data is stored in a corresponding voice channel of two voice frames continuous in the time axis direction in a predetermined communication period;
For each of the two first-stage frames that are continuous in the time axis direction, one voice frame is replaced with a non-speech frame dedicated to non-voice data, and a second-stage frame is generated, and the second-stage frame is transmitted in order Step to do.

Another digital radio control method of the present invention includes the following steps.
Receiving a frame;
Dividing the voice frame period and the non-voice frame period based on the header of the received frame in the predetermined communication period;
Determining whether each channel of each voice frame period is a voice channel or a non-voice channel replacing the voice channel, and constructing voice data of each voice frame period based on the discrimination, and Replaying the audio signal based on the step;

  According to the present invention, in the predetermined communication period, in the first stage frame, the two consecutive frames in the time axis direction are set as the same audio data content in the transmission unit. Therefore, at the time of generating the second stage frame, any one of the first stage frames that are continuous in the time axis direction may be replaced with a non-high-speed information frame. The process of determining whether or not it is a voice frame can be omitted.

  According to the present invention, in the predetermined communication period, the receiving unit divides the audio frame period and the non-audio frame period based on the header of the received frame and constructs the audio data from the audio frame period. Even if it exists in the voice frame and the non-voice frame, the voice data can be accurately constructed.

  FIG. 1 is a schematic configuration diagram of a digital wireless terminal 10. In the reception mode of the digital wireless terminal 10, radio waves from a base station or a partner device (both not shown) are captured by the antenna 11 and converted into an RF signal. The RF signal is converted into the first stage IF signal, and then converted into the second stage IF signal in the second stage IF generator 14. The second stage IF signal is amplified by the amplifier 15, supplied to the A / D converter 16, and converted into a digital signal by the A / D converter 16.

  The DSP 20 mounts a vocoder 21. The vocoder 21 demodulates the digital signal from the A / D converter 16, extracts symbol data, and generates a reception frame. The vocoder 21 cooperates with the codec unit 24 to reproduce the audio signal from the audio data from the audio frame in the received frame. The audio signal is amplified by the amplifier 28, adjusted in level by the volume adjusting unit 29, and finally output from the speaker 30 as sound.

  The DSP 20 extracts high-speed information data from the high-speed information channel in the high-speed information frame and the voice frame, and supplies it to the microcomputer 26. The microcomputer 26 issues instructions for various processes to the DSP 20 based on data from the DSP 20 and other data in a ROM (not shown).

  In the transmission mode of the digital wireless terminal 10, the user's voice is converted into an audio (electrical) signal by the microphone 35, and the audio signal is amplified by the amplifier 36 and then input to the codec unit 24. The codec unit 24 cooperates with the vocoder 21 to generate a digital modulation signal based on the audio signal from the amplifier 36.

  The digital modulation signal is supplied to the voltage controlled oscillator 43 through the switch 40, the amplifier 41 and the level adjusting unit 42. The voltage control oscillator 43 generates an RF signal based on the digital modulation signal from the level adjustment unit 42, and the RF signal is transmitted from the antenna 11 by radio waves.

  FIG. 2 shows the data correspondence relationship between MIC (microphone) input data and the first stage frame when the vocoder voice coding rate and the digital wireless terminal transmission rate are half rate and 9600 bps, respectively. Hereinafter, a communication period in which the voice coding rate of the vocoder and the transmission rate of the digital wireless terminal are set to a half rate and 9600 bps, respectively, is referred to as a “half rate / high speed communication period”.

  The illustrated MIC input data M1 to M4 are encoded by the vocoder 21 to generate V1 to V4. Four sections of MIC input data continuous in the time axis direction are defined as one section group, and data sections in each section group are defined as sections M1 to M4 in order from the front. All sections M1 to M4 of each section group, that is, the number of bits for 80 ms (= 288b) falls within the number of bits of one transmission frame of 40 ms (= 384b). The DSP 20 stores the segments M1 to M4 of the same segment group in the audio channels V1 to V4 of two frames continuous in the time axis direction, and generates a first stage frame. That is, each pair of audio frames in the first stage frame has the same audio data content in its data portion.

  During the half-rate / high-speed communication period, the microcomputer 26 maintains, for example, the audio frame on the front side as it is and the audio frame on the back side for any two first-stage frames that are continuous in the time axis direction. A second stage frame is generated by switching to the high-speed information frame. The second stage frame thus generated is shown in FIG. In the two frames shown in FIG. 3, the front side is an audio frame and the rear side is a high-speed information frame, but the front audio frame and the rear high-speed information frame in FIG. It does not necessarily correspond to the front and rear frames of the same audio frame pair in one stage. That is, the front audio frame and the rear high-speed information frame may be a rear frame of the previous frame pair and a front frame of the rear frame pair in a frame pair continuous in the time axis direction.

  In the second stage frame, the microcomputer 26 not only replaces the voice frame of the first stage frame with the high speed information frame but also occasionally steals the voice channel of the frame maintained in the voice frame to the high speed information. FIG. 4 shows various examples in which the voice channel of the voice frame is stolen to the high-speed information channel. Note that the time of one high-speed information channel corresponds to two times of that of the voice channel.

  In FIG. 4A, all of the audio channels V1 to V4 are stolen to two high-speed information channels FA. In FIG. 4B, the voice channels V1 and V2 are stolen to one high-speed information channel FA. In FIG. 4C, the voice channels V3 and V4 are stolen to one high-speed information channel FA.

  Finally, the second stage frame shown in FIGS. 3 and 4 is transmitted from the digital wireless terminal 10 and received by the other party's digital wireless terminal 10.

  FIG. 5 is a flowchart of various processes performed in the DSP 20 during the reception mode of the digital wireless terminal 10. FIG. 5A is a flowchart of a routine executed when link information is detected (link information is in the header of the frame), and FIG. 5B is a high-speed information channel determination time (when a high-speed information channel is detected). FIG. 5C is a flowchart of a routine executed at the initial time (at the start of the reception mode).

  In the flowchart of FIG. 5A, in S51, it is determined whether or not it is a half rate / high speed communication period. If the determination result is positive, the process proceeds to S52, and if not, the routine is immediately terminated. . Various methods are known for distinguishing between full rate and half rate. For example, the audio channel is decoded at full rate and half rate, and the resulting error rate and FEC information are compared. Can be determined.

  In S52, it is determined whether the audio processing permission flag is in the set state (“1”) or the clear state (“0”). If in the set state, the process proceeds to S54 after passing through S53, If it is in the clear state, the process immediately proceeds to S54. In S54, the steal permission flag is reversed.

  In S54, based on the link information, it is determined whether the received frame detected this time is a voice frame or other (eg, high-speed information frame). If the determination is other, the routine is terminated. If the determination is an audio frame, the process proceeds to S55, and both the audio processing permission flag and the steel permission flag are set.

  Thereby, every time the header of the audio frame is detected during the half rate / high-speed communication period, both the audio processing permission flag and the steel permission flag are set. In addition, during the half-rate / high-speed communication period, if the previous detected received frame is an audio frame and the current detected received frame is another frame such as a high-speed information frame, the audio processing permission flag is set. While being maintained, the steal permission flag is cleared.

  In the flowchart of FIG. 5B, in S61, it is determined whether or not it is a half rate / high speed communication period. If the determination result is positive, the process proceeds to S62, and if not, the process proceeds to S63. In S62, it is determined whether the steel flag is in the set state or in the clear state. If it is in the set state, the process proceeds to S63, and if it is in the clear state, the routine ends.

  In S63, a Lost Frame (repeat) process is executed. The fact that the steal (permitted) flag is set in S62 means that the current received frame is an audio frame in the half rate / high speed communication period. The case where the steal (permitted) flag is determined to be in the clear state in S62 is a case where the current received frame is other (eg, high speed information frame) in the half rate / high speed communication period. Furthermore, the case where it is determined as NO in S61 is, for example, a case where the voice channel is stolen to the high-speed information channel in the communication period corresponding to the transmission frames of FIGS.

  In the flowchart of FIG. 5C, in S67 and S68, the audio processing permission flag and the steel permission flag are cleared, respectively.

  FIG. 6 shows the relationship among the received frame in the half rate / high-speed communication period, the execution timing of each flow in FIG. 5, the state of the audio processing permission flag, and the steal permission flag. In FIG. 6, a, b, and c in the flow mean routines (a), (b), and (c) in FIG. In FIG. 6, “X” means a time segment that is neither an audio channel nor a stolen audio channel, “V” means an audio channel time segment, and “L” is an audio channel that has been stolen. Means the time division of the channel. Err (error) means a time segment in which data cannot be extracted due to deterioration of the reception environment or the like.

  Flow c is executed once at the start of the reception mode. Flow b is executed every time a high-speed information channel is detected. The flow a is executed every time a frame header is detected.

  When the voice processing permission flag is set in S55 of FIG. 5, the voice processing permission flag is maintained in the set state during the half rate / high-speed communication period. Therefore, in FIG. 6, the voice processing permission flag is maintained in the set state after the first execution of the flow a. . The steal permission flag is in a clear state during the high-speed information frame reception period, and is in a set state during the voice frame reception period.

  Thus, when a voice channel is detected during a period in which the steal is set, voice data is extracted from the voice channel, and when a high-speed information channel is detected, the high-speed information channel assumes that the voice channel has been stealed. If Frame (repetition) processing is performed, accurate sound data can be constructed, and sound without trouble can be output.

  FIG. 7 is an explanatory diagram of predetermined transmission power control. In the half rate / high speed communication period, in some cases, high speed information data to be transmitted may not be generated. Even in such a case, every other high-speed information frame is mechanically generated as the second stage frame in the time axis direction, but the data of the high-speed information channel of the high-speed information frame is substantially empty. High-speed information frames do not need to be transmitted. Therefore, it is preferable to suppress the power consumption of the battery of the digital wireless terminal 10 by setting the transmission power to 0 or decreasing during the transmission period of the high-speed information frame in which the data is empty.

  When the digital wireless terminal 10 is in the reception mode, there is no problem even if a high-speed information frame of empty data with reduced transmission power is received as shown in FIG. The reception period of the high-speed information frame becomes a detection error, and the flow b in FIG. 6 is not executed for such a reception frame. In every other voice frame reception period, S56 of FIG. 5 is executed, the steal is maintained in the set state, and the set state of steal is also maintained in the high-speed information reception period of the next lower transmission power. However, since the high-speed information channel cannot be detected in the high-speed information reception period in which the transmission power is reduced, error processing is performed on the voice frame channel, but the Lost Frame (repetition) processing is not performed. .

  FIG. 8 is a functional block diagram of the transmission unit 73 of the digital wireless device 72. The digital radio 72 is, for example, the digital radio terminal 10 of FIG. The digital wireless device 72 is not limited to a portable type, and may be a vehicle-mounted type or a stationary type. When divided into time segments of a predetermined length in the time axis direction, audio data of each time segment is stored in each audio channel of the frame, and the total number N of audio channels in the frame is N, the total of N audio data time segments A communication period in which two frames are transmitted within the time is called a predetermined communication period. The predetermined communication period is, for example, a half rate / high speed communication period. N is, for example, 4 in the half rate / high-speed communication period of the digital wireless terminal 10.

  The transmission unit 73 includes audio data generation means 74, non-audio data generation means 75, first stage frame generation means 76, second stage frame generation means 77, and transmission means 78. The sound data generation means 74 generates sound data. The non-voice data generation means 75 generates non-voice data. The first stage frame generation means 76 generates the first stage frame so that the same audio data is stored in the corresponding audio channels of two audio frames continuous in the time axis direction during the predetermined communication period.

  The second stage frame generation means 77 generates a second stage frame by replacing one voice frame with a non-voice frame dedicated to non-voice data for each of the two first stage frames that are continuous in the time axis direction. The transmission means 78 transmits the second stage frame in order.

  The audio data relates to the voice of the user who carries the digital wireless device 72, for example. The voice data generation means 74 is, for example, the vocoder 21 (FIG. 1). The non-voice data and the non-voice channel are, for example, data related to high-speed information and a high-speed information channel. The first and second stage frames are, for example, the first and second stage frames of FIGS.

  When the first stage frame generating means 76 generates a first stage frame in which every other audio frame is arranged in the time axis direction, the second stage frame generating means 77 of the next stage includes the first stage frame. When interrupting a non-speech frame, in order not to crush the speech frame, it is checked whether the interrupt timing is the speech frame timing of the first stage frame, and the timing that is not the speech frame is estimated. Non-voice frames need to be interrupted. On the other hand, in the digital radio 72, the second stage frame generation means 77 only needs to interrupt the non-voice frame into the first stage frame mechanically at every other frame timing in the time axis direction. Processing can be simplified.

  Preferably, the second stage frame generation means 77 appropriately switches the audio channel of the other audio frame to a non-audio channel storing non-audio data.

  Even if the transmission unit 73 replaces the voice channel of the non-voice frame with the non-voice channel, the reception unit distinguishes between the voice frame period and the non-voice frame period, and only the non-voice channel of the voice frame period is switched. Since the determination is made, the receiving unit can construct the voice data without any trouble.

  Preferably, the transmission unit 73 includes transmission power control means 82. The transmission power control means 82 reduces the transmission power during the transmission period of the non-voice frame whose data content is empty. The description of this specific example is described above with reference to FIG.

  FIG. 9 is a functional block diagram of the receiving unit 86 of the digital wireless device 72. The receiving unit 86 includes a frame receiving unit 87, a frame period dividing unit 88, an audio data construction unit 89, and an audio signal reproducing unit 90. The frame receiving means 87 receives a frame. The frame period dividing means 88 divides into a voice frame period and a non-voice frame period based on the header of the received frame in a predetermined communication period.

  The voice data construction unit 89 determines whether each channel in each voice frame period is a voice channel or a non-voice channel obtained by replacing the voice channel, and builds voice data in each voice frame period based on the determination. The audio signal reproduction means 90 reproduces an audio signal based on the constructed audio data.

  As described above, in the predetermined communication period, the receiving unit 86 divides the voice frame period and the non-voice frame period based on the header of the received frame, and the voice data performs the voice data construction process only from the channel of the voice frame period. Accordingly, it is possible to avoid an error that the non-voice channel in the non-voice frame period is a replacement of the voice channel and to construct inappropriate voice data.

  Preferably, the voice data construction unit 89 treats the voice data of the voice channel replaced with the non-voice channel as the voice data of the lost voice channel, and constructs the voice data of each voice frame period. The voice data of the lost voice channel is, for example, silent voice data (if the number of consecutive lost voice channels is small, there is no problem even if it is processed as silent), or the voice of the voice channel immediately before the effective voice channel. Or the same as the data.

  Typically, the audio data construction means 89 has the same number of audio frames as the excess from the oldest for the audio frame period in which the total number of extracted audio channels and replaced audio channels exceeds N. A voice channel for the voice frame period is constructed by replacing the voice channel with an excess new voice channel.

  Due to the deterioration of the reception environment, the header of the received frame cannot be detected temporarily, and although it is actually the next frame, the voice data construction means 89 does not know that the voice frame continues. May construct audio data based on the audio channel of one or more subsequent frames or the switched audio channel, in which case the audio channel of the audio frame or the switched audio channel The total number exceeds N, causing a problem that appropriate audio data cannot be constructed. In response to this, the audio data construction unit 89 can avoid the deterioration of the reproduced sound by setting the number of audio channels to N in each audio frame period.

  FIG. 10 is a flowchart of the transmission control method 100 applied to the digital wireless device 72. In S101, audio data is generated. In S102, non-voice data is generated. In S103, the first stage frame is generated so that the same audio data is stored in the corresponding audio channel of two audio frames continuous in the time axis direction during the predetermined communication period.

  In S104, for each of the two first stage frames continuous in the time axis direction, one voice frame is replaced with a non-voice frame dedicated to non-voice data to generate a second stage frame. In S105, the second stage frame is transmitted in order.

  The processing contents of S101 to S105 correspond to the audio data generation means 74 to transmission means 78 of FIG. The specific function contents of the sound data generation means 74 to the transmission means 78 can also be applied as specific processing contents of the processes of S101 to S105.

  FIG. 11 is a flowchart of the reception control method 110 applied to the digital wireless device 72. In S111, a frame is received. In S112, a predetermined communication period is divided into a voice frame period and a non-voice frame period based on the header of the received frame.

  In S113, it is determined whether each channel in each voice frame period is a voice channel or a non-voice channel obtained by replacing the voice channel, and voice data in each voice frame period is constructed based on the determination. In S114, an audio signal is reproduced based on the constructed audio data.

  The processing contents of S111 to S114 correspond to the frame receiving means 87 to the audio signal reproducing means 90 of FIG. The specific function contents of the frame receiving means 87 to the audio signal reproducing means 90 can also be applied as specific processing contents of the processes of S111 to S114.

  Although the present invention has been described with respect to the best mode, the present invention is not limited to this, and each constituent element in the best mode can be modified and embodied without departing from the gist of the invention. Various inventions can be formed by a convenient combination of a plurality of constituent elements disclosed in the best mode. For example, some components may be deleted from all the components shown in the best mode. Furthermore, it is possible to combine components according to different best modes.

It is a schematic block diagram of a digital wireless terminal. It is a figure which shows the data correspondence of MIC input data and a 1st step frame when the audio | voice coding rate of a vocoder and the transmission rate of a digital wireless terminal are set to a half rate and 9600 bps, respectively. It is a figure which shows a 2nd step frame. It is a figure which shows the various examples in which the audio | voice channel of an audio | voice frame is stolen to the high-speed information channel. 6 is a flowchart of various processes performed in the DSP during the reception mode of the digital wireless terminal.

It is a figure which shows the relationship of the receiving frame etc. of a half rate / high-speed communication period. It is explanatory drawing of predetermined | prescribed transmission power control. It is a functional block diagram of the transmission part of a digital radio. It is a functional block diagram of the receiving part of a digital radio. It is a flowchart of the transmission control method applied to a digital radio.

It is a flowchart of the reception control method applied to a digital radio. It is a figure which shows the data correspondence of MIC input data and a transmission frame when the audio | voice coding rate of a vocoder and the transmission rate of a digital wireless terminal are set to a half rate and 4800 bps, respectively. It is a figure which shows the data correspondence of MIC input data and a transmission frame when the audio | voice coding rate of a vocoder and the transmission rate of a digital wireless terminal are set to a full rate and 9600 bps, respectively. It is explanatory drawing supposing the data correspondence of MIC input data and a transmission frame when the audio | voice coding rate of a vocoder and the transmission rate of a digital wireless terminal are set to a half rate and 9600 bps, respectively.

Explanation of symbols

72: Digital radio, 73: Transmitter, 74: Audio data generation means, 75: Non-audio data generation means, 76: First stage frame generation means, 77: Second stage frame generation means, 78: Transmission means, 82 : Transmission power control means, 86: reception unit, 87: frame reception means, 88: frame period division means, 89: audio data construction means, 90: audio signal reproduction means, 100: transmission control method, 110: reception control method.

Claims (9)

Within the total time of N time segments, when the time data is divided into time segments of a predetermined length in the time axis direction, and the audio data of each time segment is stored in each audio channel of the frame and the total number of audio channels in the frame is N A communication period in which two frames are transmitted at a time is called a predetermined communication period.
The transmitter
Audio data generating means for generating audio data;
Non-voice data generating means for generating non-voice data;
First stage frame generating means for generating a first stage frame so that the same voice data is stored in a corresponding voice channel of two voice frames continuous in a time axis direction in a predetermined communication period;
Second stage frame generating means for generating a second stage frame by replacing one voice frame with a non-voice frame dedicated to non-voice data for each of the two first stage frames continuous in the time axis direction, and a second stage Means for transmitting frames in order,
A digital wireless device comprising:   2. The digital radio according to claim 1, wherein the second-stage frame generation unit appropriately switches a voice channel of the other voice frame to a non-voice channel storing non-voice data. The transmitter is
In the transmission period of non-voice frames in which the data content is empty, power control means for reducing transmission power,
The digital wireless device according to claim 1, further comprising: When divided into time segments of a predetermined length in the time axis direction, audio data of each time segment is stored in each audio channel of the frame, and the total number N of audio channels in the frame is N, the total of N audio data time segments A communication period in which two frames are transmitted within a time period is called a predetermined communication period.
The receiver
Frame receiving means for receiving a frame;
In a predetermined communication period, a frame period dividing means for dividing into a voice frame period and a non-voice frame period based on the header of the received frame;
Audio data construction means for discriminating whether each channel of each audio frame period is an audio channel or a non-audio channel replacing the audio channel, and constructing audio data of each audio frame period based on the discrimination, and Audio signal reproducing means for reproducing an audio signal based on the audio data;
A digital wireless device comprising:   5. The voice data construction means treats voice data of a voice channel replaced with a non-voice channel as voice data of a lost voice channel, and constructs voice data of each voice frame period. Digital radio.   The voice data constructing means, for a voice frame period in which the total number of extracted voice channels and replaced voice channels exceeds N, exceeds the number of voice channels from the earliest number of voice channels. 6. The digital radio apparatus according to claim 4, wherein a voice channel for the voice frame period is constructed by replacing the new voice channel. Within the total time of N time segments, when the time data is divided into time segments of a predetermined length in the time axis direction, and the audio data of each time segment is stored in each audio channel of the frame and the total number of audio channels in the frame is N A communication period in which two frames are transmitted at a time is called a predetermined communication period.
The transmitter
Audio data generating means for generating audio data;
Non-voice data generating means for generating non-voice data;
First stage frame generating means for generating a first stage frame so that the same voice data is stored in a corresponding voice channel of two voice frames continuous in a time axis direction in a predetermined communication period;
Second stage frame generating means for generating a second stage frame by replacing one voice frame with a non-voice frame dedicated to non-voice data for each of the two first stage frames continuous in the time axis direction, and a second stage Means for transmitting frames in order,
With
The receiver
Frame receiving means for receiving a frame;
In a predetermined communication period, a frame period dividing means for dividing into a voice frame period and a non-voice frame period based on the header of the received frame;
Audio data construction means for discriminating whether each channel of each audio frame period is an audio channel or a non-audio channel replacing the audio channel, and constructing audio data of each audio frame period based on the discrimination, and Audio signal reproducing means for reproducing an audio signal based on the audio data;
A digital wireless device comprising: When divided into time segments of a predetermined length in the time axis direction, audio data of each time segment is stored in each audio channel of the frame, and the total number N of audio channels in the frame is N, the total of N audio data time segments A communication period in which two frames are transmitted within a time period is called a predetermined communication period.
Generating audio data;
Generating non-voice data;
Generating a first stage frame so that the same voice data is stored in a corresponding voice channel of two voice frames continuous in the time axis direction in a predetermined communication period;
For each of the two first-stage frames that are continuous in the time axis direction, one voice frame is replaced with a non-speech frame dedicated to non-voice data, and a second-stage frame is generated, and the second-stage frame is transmitted in order Step to do,
A digital radio apparatus control method comprising: When divided into time segments of a predetermined length in the time axis direction, audio data of each time segment is stored in each audio channel of the frame, and the total number N of audio channels in the frame is N, the total of N audio data time segments A communication period in which two frames are transmitted within a time period is called a predetermined communication period.
Receiving a frame;
Dividing the voice frame period and the non-voice frame period based on the header of the received frame in the predetermined communication period;
Determining whether each channel of each voice frame period is a voice channel or a non-voice channel replacing the voice channel, and constructing voice data of each voice frame period based on the discrimination, and Reproducing the audio signal based on,
A digital radio apparatus control method comprising:

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