JPH11252280A - Communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sent voice data and non-voice data simultaneously with a small communication channel capacity. SOLUTION: An insertion processing section 103 replaces bits at predetermined positions and giving a less effect on voice quality among the bits of voice data inputted from a voice data processing section 101 with the bits of non-voice data inputted from a non-voice data processing section 102 and the result is sent via a portable telephone set 200. An extract processing section 104 extracts the bits at predetermined positions among the voice data received via the portable telephone set 200 and outputs them to the non-voice data processing section 102 and the voice data whose extracted bits are replaced with dummy bits are outputted to the voice data processing section 101.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for simultaneously transmitting voice data and non-voice data using a digital telephone terminal device.

[0002]

2. Description of the Related Art A technique for simultaneously transmitting voice data and non-voice data in digital communication as described in "Development of a simultaneous voice / data transmission adapter in PDC" at the 1997 IEICE General Conference. There is known a technique for alternately transmitting and receiving a voice data frame and a non-voice data frame.

Hereinafter, this technique will be described.

FIG. 5 shows a configuration of a communication apparatus for performing such simultaneous transmission, which is a time-division multiplexing of simultaneously transmitted voice data frames and non-voice data frames.

[0005] On the transmission side, the voice control unit 13 receives the voice data input from the outside via the voice input / output device 15 shown in FIG.
Generates a half-rate audio data frame shown in FIG. 6 (a). Also, based on the non-voice data input from the data input / output device 16, the data control unit 14
A full-rate non-voice data frame shown in FIG. The demultiplexing unit 12 receives the generated voice data frame and the non-voice data frame alternately every 20 ms, and transmits the received voice data frame and the non-voice data frame to the receiving side via the wireless processing device 11 as shown in FIG.
Each frame is transmitted by the full rate method shown in (c).

Here, the half-rate system and the full-rate system are defined as RCR (Reseach & Development Center for Radio).
Systems: Radio System Development Center) This is a standard of the frame rate specified in the standardized document RCR STD-27F issued by the RCR STD-27F. In the full rate system, frames are transmitted at twice the frame rate of the half rate system.

On the other hand, the demultiplexing section 12 on the receiving side monitors the signals received via the radio processing apparatus 11, establishes frame synchronization, and combines voice frames and non-voice data frames within a certain time. Is detected, and FIG. 6 (c)
Are also established for each of the audio data frame and the non-audio data frame.

The demultiplexing unit 12 extracts a voice data frame and a non-voice data frame in accordance with the synchronization of the established voice data frame and the non-voice data frame, and outputs the voice data frame to the voice control unit 13 and the non-voice frame. The data is passed to the data control unit 14. Voice control unit 13
Recovers the voice data from the received voice data frame and outputs it to the voice input / output device 15, and the data control unit 14 recovers the non-voice data from the received voice data frame and outputs it to the data input / output device 16.

[0009]

In the techniques shown in FIGS. 5 and 6, when simultaneous transmission of voice data and non-voice data is performed, a transmission rate equivalent to a half-rate system of voice data frames is secured and real-time transmission of voice data is performed. In order not to hinder proper transmission / reception, the entire voice data frame and the non-voice data frame are transmitted by the full-rate method. For this reason, twice the line capacity is required as compared with half-rate transmission when transmitting audio data.

Accordingly, an object of the present invention is to simultaneously transmit voice data and non-voice data with a smaller line capacity.

[0011]

In order to achieve the above object,
The present invention relates to a communication device for simultaneously transmitting voice data and non-voice data, wherein, among the bits constituting the voice data to be input, bits having a small effect on predetermined voice quality, Means for transmitting by replacing the bits of the received voice data, and extracting bits having a small effect on the predetermined voice quality from the bits constituting the received voice data, outputting the bits as non-voice data, and extracting at least the received voice data. Means for outputting audio data including a portion excluding the extracted bits.

[0012] According to such a communication apparatus, bits of the audio data which have less influence on the audio quality are replaced with non-audio data and transmitted / received. Therefore, even when simultaneous transmission of voice data and non-voice data is performed, the same line capacity as communication using only voice data is sufficient. However, since a part of the audio data is replaced with the non-audio data, the guaranteed quality of the audio data itself is lower than that in the case of performing communication using only the audio data. However, in the present invention, since the portion of the audio data to be replaced with the non-audio data is a portion having little effect on the audio quality, substantially,
The quality of the audio data does not significantly deteriorate.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a communication device according to the present invention will be described below by taking as an example an application to a form in which a communication function is added to a navigation device.

FIG. 1 shows a configuration of a communication apparatus according to the present embodiment.

As shown in the figure, the communication device according to this embodiment includes a mobile phone device 200, a navigation device 300,
It comprises a simultaneous transmission processing device 100. Further, the communication device according to the present embodiment is mounted on a mobile body such as an automobile.

The portable telephone device 200 is, for example, a digital cellular communication terminal, performs frequency conversion and demodulation of a signal received via a radio communication line, restores a transmission frame, and outputs the frame to the simultaneous transmission processing device 100. It has a function of performing modulation and frequency conversion on a transmission frame input from the simultaneous transmission processing device 100 and transmitting the result to a wireless communication line.

Next, the navigation device 300 uses the CP
U301, storage device 302, stored road map data
Various measurements such as an external storage device 304 such as a CD-ROM driver equipped with a CD-ROM, a display device 306, an audio processing device 307, a speaker 308, a microphone 309, a GPS receiver, a vehicle speed sensor, a geomagnetic sensor, and a gyro sensor. Device 315, various interface processing units 310 and 31
1, 312, 313, 303, 305, 314, and the like.

CPU 301 of navigation device 300
Executes the program stored in the storage device 302,
Measuring device 3 read via interface unit 314
The current position of the moving object is calculated on the basis of the measured values of No. 15 and the road map data read from the external storage device 304 via the interface unit 303. Display processing on the display device 306. Also, the CPU 301
From the simultaneous transmission processing device 100 to the interface unit 31
2 to process non-voice data input via The content of the processing of the non-voice data differs depending on the type of the non-voice data. For example, when the non-voice data is the notification information to the user, a process of displaying the information on the display device 306 can be considered. Further, the CPU 301 performs a process of outputting non-voice data to be transmitted via the communication line to the simultaneous transmission processing device 100 via the interface unit 313. The non-voice data to be transmitted includes the navigation device 3
Data indicating the state of 00, data input by the user, and the like can be considered. Also, the audio processing device 307 has a CPU
Under the control of 301, the audio represented by the audio data transmitted from the simultaneous transmission processing device 100 via the interface unit 310 is output from the speaker 308. The audio processing device 307 also controls the microphone 30 under the control of the CPU 301.
9 is converted into audio data and output to the simultaneous transmission processing device 100 via the interface unit 312.

FIG. 2 shows the configuration of the simultaneous transmission processing device 100.

As shown in FIG.
Are the voice data processing unit 101 and the non-voice data processing unit 10
2. It has an insertion processing unit 103 and an extraction processing unit 104.

The audio data processing unit 102 performs, for example, compression / expansion of audio data defined by the above-mentioned half rate system of RCR STD-27F, and communication channel coding / decoding.

That is, the audio data processing unit on the transmission side compresses and encodes the audio data sent from the navigation device 300 by a predetermined compression encoding algorithm for each unit amount. The compressed audio data is referred to as “compressed audio data”), and a compressed audio data frame is generated. In addition, in order to make the compressed audio data frame suitable for transmission, the compressed audio data of each compressed audio data frame is further channel-coded according to a predetermined channel coding algorithm. The data is referred to as “channel-coded voice data”), and a channel-coded voice data frame is generated. In this channel coding, among bits of various parameters forming compressed audio data of each compressed audio data frame, a bit having a large influence on a predetermined audio quality is set as an error protection target bit, and a bit corresponding to the remaining audio quality is determined. Bits that have little effect are excluded from error protection. The error protection target bits are encoded with a predetermined convolutional code after adding a CRC code for error detection. Then, both the bits to be protected and the bits not to be protected after the convolutional code are bit-interleaved in a predetermined order. Then, it further performs frame interleaving to generate a channel-coded audio data frame, and
Send to 3.

On the contrary, the audio data processing unit on the receiving side converts the channel encoded audio data of each channel encoded audio data frame transmitted from the extraction processing unit 104 into
A process of restoring each compressed audio data frame and a process of restoring audio data from the compressed audio data of each compressed audio data frame are performed. Then, the finally restored audio data is output to the navigation device 300. When restoring the compressed audio data from the channel-encoded audio data, error detection is performed on the error protection target bits using a CRC code, and processing such as discarding the compressed audio data frame containing the error is performed. .

Next, the non-voice data processing section 102 sends the non-voice data input from the navigation device 300 to the insertion processing section 103. The non-voice data sent from the extraction processing unit 104 is output to the navigation device 300.

Next, the insertion processing unit 103 and the extraction processing unit 10
4 will be described in detail.

First, the insertion processing unit 103 will be described.

FIG. 3 shows the internal configuration of the insertion processing unit 103.

As shown in the figure, an insertion position indicating unit 20, an insertion bit counting unit 21, and a bit insertion unit 22 are provided.

The insertion position instructing section 20 detects the position of a predetermined bit in the channel-encoded audio data frame sent from the audio data processing section 101, and determines the position as an insertion bit counting section 21. It instructs the bit insertion unit 22. Here, a predetermined number of bits having less influence on voice quality among the bits not subject to error protection are sequentially detected from the least influential bits so that the bits detected in advance in the channel coding frame of the channel are not detected. The position and the order of detection should be determined.

Next, when the position is indicated by the insertion position instructing section 20, the insertion bit counting section 21 receives the non-speech data from the non-speech data processing section 102, that is, the non-speech data to be transmitted. When data exists, the non-voice data is sent to the bit insertion processing unit 22 for one bit. Further, the insertion bit counting unit 21 counts the number of bits transmitted to the bit insertion processing unit 22 for each channel-coded audio data frame. Then, when the above processing is completed for one channel encoded voice data frame, the counting result is sent to the bit insertion processing unit 22. However, when the insertion bit counting unit 21 is instructed by the insertion position instructing unit 20 during processing of a certain channel-coded audio data frame,
If there is no non-speech data to be transmitted and the bit of the non-speech data for the position is not sent to the bit inserting unit 22, the non-speech data to be transmitted thereafter is processed during the processing of the channel encoded speech data frame. Even if data is generated, the bit of the non-voice data is not sent to the bit insertion unit 22.

When the bit of the non-speech data is sent from the insertion bit counting unit 21, the bit insertion processing unit 22 replaces the bit of the channel coded speech data at the position designated by the insertion position designation unit 20. .

Then, the transmission frame including the channel-coded voice frame in which the bits are replaced with non-voice data and the counting result sent from the insertion bit counting unit 21 added before the channel-coded voice frame is generated. It is created and output to the mobile phone device 200.

Next, the extraction processing unit 104 will be described.

FIG. 4 shows the internal configuration of the extraction processing unit 104.

As shown in the figure, the extraction processing unit has an insertion bit number detection unit 30, an extraction position instruction unit 31, and a bit extraction unit 32.

The number-of-inserted-bits detecting section 30 detects the counting result included in the transmission frame input from the mobile phone 200 and sends the number indicated by the detected counting result to the extraction position indicating section 31.

The extraction position instructing section 31 is provided in the portable telephone device 20.
The position of the same bit as the bit detected by the insertion position indicator 20 in the channel encoded speech data frame in the transmission frame input from 0 is determined by the number of insertion positions indicated by the insertion bit number detector 30. The detection is performed in the same order as 20 and the detected position is instructed to the bit extraction unit 32.

The bit extracting unit 32 is used for the mobile phone 200
Of the channel-encoded voice data in the channel-encoded voice data frame in the transmission frame input from the input unit, extracts the bits at the positions indicated by the extraction position instructing unit 31 in the order instructed, and extracts the non-voice data processing unit 102 Output to Further, a channel-coded audio data frame in which the extracted bits are replaced with predetermined dummy bits is output to the audio data processing unit 101.

As a result of the above processing, bits of the audio data that have less influence on the audio quality are transmitted and received after being replaced with non-audio data. Therefore, even when simultaneous transmission of voice data and non-voice data is performed, the same line capacity as communication using only voice data is sufficient.

Of course, since a part of the voice data is replaced with the non-voice data, the guaranteed quality of the voice data itself is lower than that in the case of performing the communication using only the voice data.
However, since the portion of the audio data that is replaced by the non-audio data is a portion that has little effect on the audio quality, the quality of the audio data does not substantially deteriorate substantially. For example, the RCR standard allows an error of up to 3% of the audio data, but in this case, if the non-error-protected bits in the RCR STD-27F to be replaced with the audio data are set to 6 bits or less, the RCR STD-27 Since the channel-coded audio data frame length in 27F is 224 bits, the error in the audio data due to this replacement is
It will be within the allowable range of the standard.

According to the present embodiment, the number of bits obtained by replacing the audio data with the non-audio data is transmitted from the transmission side to the reception side, so that the audio quality does not deteriorate from zero to an allowable value. , Non-voice data can be transmitted and received at an arbitrary rate.

As will be understood from the above, the present embodiment has a remarkable advantage particularly in a system for transmitting and receiving non-voice data at a low rate and in an application for intermittently transmitting non-voice data. It is a thing.

The embodiment of the present invention has been described above.

In the above embodiment, the number of non-error bits replaced by non-voice data bits (the result of counting by the insertion bit number counting unit 21) is added to the channel-coded voice data frame for transmission / reception. However, by replacing a few bits in the channel coded voice data frame that have the least effect on the voice quality of the non-error bits in the channel coded voice data frame, the counting result is calculated by the channel coded voice data frame. You may make it transmit and receive.

In the above embodiment, RCR STD-27F
Although the example in which a part of the non-error target bits are replaced with non-speech data bits for transmission has been described, the present embodiment is similarly applied to the case of handling speech data encoded by other methods. be able to. That is, of the bits of the audio data of an arbitrary format, the number of bits within the range in which the deterioration of the audio quality is permissible is replaced with the bits of the non-audio data, and the bits are transmitted and received, from the bit having the least influence on the audio quality. do it. For example, in the simplest case, when voice data is transmitted by a PCM code, the least significant bit of each data has the least effect on voice quality. What should I do?

Further, the simultaneous communication device is included in the portable telephone device, and voice input / output is performed from a microphone and a speaker of the portable telephone, and only non-voice data is inputted between the portable telephone device and an external data processing device. You may make it output. Alternatively, the mobile phone device may have a function of processing the non-voice data, such as displaying the non-voice data on a display device provided in the mobile phone.

[0047]

As described above, according to the present invention, simultaneous transmission of voice data and non-voice data can be performed with a smaller line capacity.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a communication device.

FIG. 2 is a block diagram illustrating a configuration of a simultaneous transmission processing device.

FIG. 3 is a block diagram illustrating a configuration of an insertion processing unit.

FIG. 4 is a block diagram illustrating a configuration of an extraction processing unit.

FIG. 5 is a block diagram showing a configuration of a conventional communication device.

FIG. 6 is a diagram showing a conventional simultaneous transmission of voice data and non-voice data.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 ... Insertion position indication part 21 ... Insertion bit number counting part 22 ... Bit insertion part 30 ... Insertion bit number detection part 31 ... Extraction position indication part 32 ... Bit extraction part 100 ... Simultaneous transmission processing device 101 ... Audio data processing part 102 ... Non-speech data processing unit 103: insertion processing unit 104: extraction processing unit 200: mobile phone device 300: navigation device

Continued on the front page (72) Inventor Yasuaki Takahara 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the multimedia system development headquarters of Hitachi, Ltd. (72) Inventor Kazuhisa Kobayashi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa (72) Inventor Toru Nakamura 2-4991 Hironodai, Zama City, Kanagawa Prefecture, Japan Incorporated Company Zanavi Informatics (72) Inventor Yukio Takeuchi 2-4991 Hironodai, Zama City, Kanagawa Prefecture Address Co., Ltd. in Xanavi Informatics

Claims (6)

[Claims] 1. A communication device for simultaneously transmitting voice data and non-voice data, wherein bits of input voice data which have a small effect on predetermined voice quality are input to the non-voice Means for transmitting by replacing data bits, and extracting bits having a small effect on the predetermined voice quality from bits constituting the received voice data, outputting the bits as non-voice data, and outputting at least the received voice data. Means for outputting audio data including a part excluding the extracted bits. 2. A communication apparatus for simultaneously transmitting voice data and non-voice data, wherein when non-voice data to be transmitted exists, a predetermined position of bits constituting input voice data is Means for replacing certain bits with bits of non-speech data to be transmitted in a predetermined order, and transmitting the bits together with the number of replacement bits indicating the number of replaced bits; and The bit at the specified position is extracted by the number indicated by the number of received replacement bits, in the predetermined order, and output as non-voice data, and voice data including at least a portion excluding the extracted bits of the received voice data is output. And a communication device. 3. The communication device according to claim 2, wherein the predetermined position is a position of a bit having a small effect on voice quality, and the predetermined order is a bit position having no influence on voice quality. A communication device wherein the positions of smaller bits are in the order of being earlier. 4. A communication device for simultaneously transmitting voice data and non-voice data, comprising: means for generating a voice data frame in accordance with RCR STD-27F; Means for replacing at least a predetermined part of the bits with bits of non-voice data to be input and transmitting the bits via a wireless transmission system, and among bits constituting a voice data frame received via a wireless transmission system, Means for extracting a predetermined part and outputting the same as non-speech data, and outputting a sound data frame including a part excluding at least the extracted bits of the received sound data. 5. An in-vehicle system mounted on a vehicle and communicating via a mobile phone terminal, comprising: a navigation unit for navigating the driving of the vehicle; and a simultaneous transmission processing unit. A simultaneous communication processing unit, a processing unit for processing non-voice data and voice data to be input / output, and the simultaneous transmission processing unit encodes voice data input from the navigation unit, and configures the coded voice data. Of the bits, a bit having a small effect on predetermined voice quality is replaced with a bit of non-voice data input from the navigation unit, and means for transmitting via the mobile phone terminal; and via the mobile phone terminal, Out of the bits constituting the encoded audio data received by the Means for outputting encoded non-audio data to the navigation unit, decoding encoded audio data including a portion excluding at least extracted bits of the received encoded audio data, and outputting the decoded audio data to the navigation unit. An in-vehicle system characterized by the following. 6. A method for simultaneously transmitting voice data and non-voice data, comprising: transmitting, on a transmission side, bits that have a small effect on predetermined voice quality among bits forming voice data to be transmitted; On the receiving side, bits that have a small effect on the predetermined voice quality are extracted from the bits constituting the received voice data and processed as non-voice data. A simultaneous transmission method, characterized in that at least a portion of extracted audio data excluding extracted bits is processed as audio data.