JP3293457B2 - Mobile radio telephone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record a coded voice signal being a voiced signal for a long time to a recording section by recording accessory information to the recording section when the coded voice signal to be recorded in the recording section is a silent. SOLUTION: A control section 14 that detects voice/silence information discriminated by a voice processing circuit section 3 discriminates a silence period of a coded voice signal to be recorded in a recording section 11. Then the coded voice signal discriminated to be in a silence period is not sent to a recording information generating section 16 as it is but the silence information is sent from the control section 14 to an accessory information generating section 15 and the accessory information generating section 15 generates accessory information denoting the silence state. Furthermore, a recording information generator separate section 16 generates recording information based on the accessory information and the voiced coded voice signal. That is, the coded voice signal for a period when discriminated to be silent is replaced with a signal with a comparatively short signal denoting the silent state and the resulting signal is recorded in the recording section 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital radio telephone and, more particularly, to a mobile radio telephone having means for recording a voice signal transmitted from a communication partner in a long-time recording unit.

[0002]

2. Description of the Related Art In recent years, a mobile radio communication system employing a digital system has been proposed.
HS (Personal Handy Phone S)
system). In a mobile radio system adopting a digital system, generally, an encoded digital audio signal is directly recorded in a memory as a means for recording a long-time conversation content in a small-capacity memory.

[0003] For example, Japanese Patent Laid-Open No. 7-143223, provided existing voice sign-decoding means, in the call state to decode the digital audio signal coded by the voice coder No. decoding means, mode designating means Describes that the encoded digital audio signal is not decoded in the state where the recording mode is designated, and the encoded digital audio signal is stored in the storage means as it is, so that the audio signal for a long time is stored in a small-capacity memory.

[0004]

The conventional mobile radio telephone is configured as described above, and when the storage mode is designated, even if the encoded voice signal to be stored is in a silent state. also stored in any process as this Sarezu as recording unit, if the signal interval of silence has continues for a long time could not almost storing coded speech signal sound state with a sound signal.

Further, such a mobile radio telephone is applied to a mobile communication system using a single encoding system, and a plurality of encoding systems are mixed and encoded by each of these encoding systems. In a system in which a call is made by using a voice signal (in general, the coding system of these mobile radio systems is configured as a single system (for example, the transmission speed is set to 20 ms / frame)). To further increase the efficiency (for example, 40 ms /
Make a frame . The), instead of replacing the base station at once with compression method of 40 ms / frame all of the base stations from different circumstances, for replace with the base station of 20 ms / frame by several units, one system A plurality of coding methods are mixed for a certain period. ), A conventional mobile radio telephone that can only be used for a single coding system could not support each coding system. For example,
When the contents of a call are stored while moving in the wireless zone of the base station using the coding scheme 1, when the mobile phone moves into the wireless zone of the base station using the coding scheme 2 on the way, the voice stored in the memory is stored. The signal has a different encoding method on the way, and the contents of the call stored in this way are not supported by the decoding means even if an attempt is made to reproduce the received voice, and only a part of the stored contents corresponding to the encoding method 1 is received. Could not play back to audio.

In the field of mobile radio telephones,
The ability to store long-time conversation contents in a small-capacity memory is extremely useful from the viewpoint of miniaturization and weight reduction.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. When an encoded audio signal is recorded in a memory, when the encoded audio signal is in a silent state, the encoded audio signal is replaced with the encoded audio signal. A new mobile radiotelephone capable of reducing the capacity of the memory for storing the silent encoded voice signal by storing the auxiliary information indicating the silent state in the memory and storing the encoded voice signal for a long time. The purpose is to provide.

In addition, a coded voice signal for a long time can be stored in the memory, and when the stored coded voice signal is reproduced into a received voice, the line quality of the coded voice signal is reduced.
Also provides novel mobile radio telephone an output or the communication state of the reception voice can inform the user by the output level corresponding to the communication state of the pseudo error rate or the like.

[0009]

[0010]

SUMMARY OF THE INVENTION The mobile radio telephone device according to the invention of claim paragraph 1, a radio circuit for demodulating the modulated wave sound signal from the base station received via the communication line to the encoded audio signal A voice processing circuit for decoding the coded voice signal demodulated by the radio circuit into a digital voice signal; and converting the digital voice signal decoded by the voice processing circuit into the modulated wave voice signal. A voice input / output unit that outputs a corresponding received voice, an auxiliary information generation unit that generates auxiliary information indicating a communication state of the modulated wave audio signal based on the line information of the communication line transmitted from the base station, A recording unit that records the encoded audio signal to which the additional information generated by the additional information generation unit is added,
When the encoded audio signal recorded in the recording section is reproduced into the received voice, the communication state of the encoded audio signal which is read out and reproduced by reading the attached information added to the encoded audio signal. And a control unit for adjusting the output level of the received voice reproduced according to the result of the identification.

According to a second aspect of the present invention, the control section of the mobile radio telephone displays the communication state of the coded voice signal reproduced in the received voice on a display section.

According to a third aspect of the present invention, there is provided a mobile radio telephone, comprising: a radio circuit unit for receiving a modulated wave audio signal transmitted from a base station and demodulating it to an encoded audio signal; and a plurality of decoding means. A voice processing circuit for decoding the encoded voice signal demodulated by the radio circuit into a digital voice signal; and a voice input / output for outputting a received voice corresponding to the modulated wave voice signal from the digital voice signal. And an auxiliary information generation unit that generates, from at least the encoded information of the modulated wave audio signal transmitted from the base station, additional information indicating an encoding scheme of the encoded audio signal at least for each frame in which the encoding scheme changes. Unit, when the encoded audio signal is read from a recording unit that records the encoded audio signal to which the additional information is added, and is reproduced as a received voice, the encoded audio signal is added to the encoded audio signal. An auxiliary information identification unit that reads the recorded auxiliary information to identify the encoding system of the encoded audio signal, and the recording unit that performs the recording by a predetermined decoding unit that corresponds to the encoding system identified by the auxiliary information identification unit. And a control unit for decoding the encoded audio signal recorded in the unit into the digital audio signal.

[0013]

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment. 1 An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing a schematic configuration of a mobile radio telephone according to the present invention, and FIG. 2 is a partial block diagram specifically showing a configuration of a control means shown in FIG. 1 and 2, reference numeral 1 denotes a microphone unit that picks up a user's voice, 2 denotes an A / D converter that converts an analog audio signal picked up by the microphone unit 1 into a digital signal, and 3 denotes an A / D converter. A voice processing circuit unit having a digital signal processing function of performing a coding process on a digital voice signal output from the unit 2 and a desired digital signal process such as a decoding process described later and an error code correction, and 4 A transmission buffer circuit for temporarily storing the encoded voice signal encoded by the processing circuit unit 3 and adjusting the transmission timing to a base station (not shown), and a code input via the transmission buffer circuit 4 The digitally modulated audio signal is used as a modulation signal to perform digital modulation, and an electrically connected antenna unit 6 is provided.
The base station transmits the modulated wave audio signal (hereinafter referred to as RF signal) to the base station (not shown), and encodes the RF signal (modulated wave reception signal) transmitted from the base station and received by the antenna unit 6. A wireless circuit unit having a modulation / demodulation function of digitally demodulating the encoded audio signal;
Temporarily stores the encoded audio signal digitally demodulated according to the above, adjusts the timing of decoding the encoded audio signal into a digital audio signal, and records / reproduces the encoded audio signal with a recording unit described later. The receiving side buffer circuit for adjusting the timing of each of the audio processing circuits 8
A D / A converter 9 for converting a digital audio signal decoded from an encoded audio signal into an analog reception signal by the D / A converter 9;
8 is a speaker unit that outputs a received voice to the outside from the output of No. 8 .

The digital modulation method of the radio circuit unit 5 is π / 4 shift DQPSK (π / 4 shifted).
differentially encoded q
uadure phase shift key
ing) method is generally used, and the audio processing circuit unit 3
VSELP (Vector
-Sum Excited Linear Predi
active coding), PSI-CELP
(Pitch Synchronous Innovat
ion-Code Excited Linear P
A data compression encoding scheme such as a redaction scheme is used. In the case of the VSELP system, the data encoded by these systems is set to PSI every 20 ms.
In the case of the CELP system, each frame is transmitted at a transmission rate of 40 ms.

2 is a control means for controlling various operations of the mobile radio telephone according to the present invention, such as a request for allocating a communication line to a base station, and 11 is a radio circuit unit 5. A recording unit such as a memory for recording a digitally demodulated coded audio signal, 12 is constituted by numeric keys such as dial keys, and an operation unit for instructing recording / reproduction of the coded audio signal from the outside, and 13 is a dial signal generation This is a display unit that displays the telephone number of the other party at the time of the call, and displays the communication status such as the line quality of the coded audio signal reproduced at the time of reproduction of the recorded coded audio signal. Or a device that generates a corresponding notification sound.

In FIG. 2, reference numeral 14 denotes a microprocessor (hereinafter, referred to as a CPU), a ROM, a RAM, and the like, and the CPU executes various control programs (for example, for wireless communication) stored in the ROM or the RAM. A control unit for controlling each unit by a necessary program, a program necessary for recording / reproduction of an encoded audio signal, a program relating to creation of additional information described later, and the like. An accessory information generation unit that creates accessory information indicating a silence state based on the sound or no sound information detected by the control unit 14 from the audio processing circuit unit 3, and a unit 16 that creates recording information to be recorded in the recording unit. Then, a silent signal section of the encoded voice signal digitally demodulated by the wireless circuit unit 5 is created by the auxiliary information generation unit 15. Recording information creation / separation having a function of replacing the recording information read out from the recording unit 11 at the time of reproducing the recording information into a sound coded audio signal and the additional information. parts, 17 writes recording information created by the instruction from the control unit 14 in the recording information creation separation unit 16 to the recording unit 11, and records recorded in the recording unit 11 in response to an instruction from the control section 14 during reproduction of the recorded information A recording information writing / reading unit 18 for reading information is read by the recording information writing / reading unit 17 and receives additional information separated from the corresponding coded audio signal. Reference numeral 11 denotes an attached information identifying unit that identifies a silent state of the encoded audio signal recorded in the audio signal 11.

Next, the operation will be described in detail with reference to FIGS. FIG. 3 is a flowchart showing the recording operation of the mobile radio telephone 36 according to the present invention shown in FIG.
FIG. 3 is a flowchart showing the operation of reproducing the recorded contents of the mobile radio telephone 36. First, the recording operation of the mobile radio telephone 36 according to the present embodiment, particularly the case of recording the contents of a call partner, will be described with reference to FIG. . In the call operation of the mobile radiotelephone 36 , in the transmission system, first, a voice signal uttered by the user is picked up by the microphone unit 1, and then the A / D converter 2, the voice processing circuit unit 3, and the transmitting side. The signal is transmitted in the order of the buffer circuit 4, the radio circuit section 5, and the antenna section 6 and transmitted to the other party through a base station (not shown). In the receiving system, the voice of the other party transmitted through the base station is reversed. Signal is mobile radiotelephone 3
6 , after being received by the antenna section 6, the wireless circuit section 5,
The signal is transmitted in the order of the receiving buffer circuit 7, the audio processing circuit section 3, and the D / A converter 8, and is transmitted from the speaker section 9 to the mobile radio telephone.
This is performed by outputting to 36 users. This call operation is continued in the above manner until the communication is terminated by the call end instruction.

When the user of the mobile radiotelephone 36 records the contents of the call of the other party in the recording unit 11 in the above-mentioned call state, first, the user of the mobile radiotelephone 36 sends the message to the operation unit 12 in step 1a. Performs key input to select a recording mode. When a key input for selecting a recording mode is performed, the operation unit 12 outputs an operation signal to the control unit 14, here, a recording instruction signal for instructing a recording operation. In response to the recording instruction signal from the operation unit 12, the control unit 14 reads the recording control program stored in the ROM or RAM provided therein and executes the subsequent recording operation in addition to the call operation.

When the recording control program is executed by the control unit 14, first, the audio processing circuit unit 3 determines whether the coded audio signal digitally demodulated by the radio circuit unit 5 in step 2a is sounded or silent based on the digital sound signal. judge. The audio processing circuit unit 3 not only determines the sound state or the silent state of the encoded audio signal decoded into the digital audio signal, but also determines how much the silent state continues. Then, the control unit 14 that has detected the sound / non-sound information determined by the sound processing circuit unit 3 executes the recording unit 1 in step 3a.
1 to determine a silent section of the encoded audio signal to be recorded. Here, the encoded audio signal determined to be a voiced section is transmitted to the recording information creation / separation unit 16 as it is, while the encoded audio signal determined to be a silent section is left as it is. The silence information is first transmitted from the control unit 14 to the attached information generation unit 15, and the attached information generation unit 15 creates the attached information indicating a silence state in step 4a. Then, the attached information indicating the silent state is sent to the recorded information creating / separating section 16, and the recorded information creating / separating section 16 creates the recorded information from the attached information and the coded audio signal having sound. That is, if the silent coded audio signal is recorded in the recording unit 11 as it is, if the silent signal section is long, the recording allowance of the voiced signal is reduced, and the code of the section determined to be silent is reduced. The converted audio signal is replaced with a signal having a relatively short data length indicating the silent state and is recorded in the recording unit 11. Then, the record information created by the record information creating / separating unit 16 as shown in FIG.
The recording information is recorded on the recording unit 11 by the recording information writing / reading unit 17 whose writing timing is adjusted by the recording information writing unit 4.

FIG. 5 is an example of recording information created by the recording information creation / separation unit 16 and recorded in the recording unit 11, and is a data configuration diagram showing a data configuration of the recording information.
The recording unit 11 records an encoded audio signal 19 of n frames (n is an integer of 1 or more) and recording information in which encoded data of the fourth to ninth frames is replaced with the attached information 20 . In addition, in FIG. 5, the accessory information 20 summarizes several frames.
Has been replaced Te, but of one frame unit encoded data
A data configuration that is created and replaced for each data may be used.

The accessory information created by the accessory information generator 15 is created by a combination of 0 and 1 data, and can be replaced with a silent coded audio signal using only a few bits of data. .

Step 6a is a step in which the control unit 14 monitors the amount of data recorded in the recording unit 11 by the recording information writing / reading unit 17, and the recording unit 11 stores in the recording unit 11 a data amount of a predetermined value or more. When the recording is performed, the control unit 14 forcibly ends the recording operation. Step 7a is performed by the control unit 14
Is a step of monitoring a recording stop signal from the operation unit 12. The user of the mobile radiotelephone 36 performs a key input for selecting a recording stop mode using the operation unit 12, and the operation unit 1
When the recording stop signal is input from 2 to the control unit 14, the control unit 14 forcibly ends the recording operation as in step 6a. As described above, according to the mobile radio telephone of the present invention according to the present embodiment, when the content of the conversation spoken by the other party is recorded in the recording unit 11, the silent section of the received encoded audio signal is longer. When the continuation is continued, the additional information indicating the silent state is recorded in the recording unit 11 instead of the silent encoded audio signal, so that the capacity of the recording unit 11 for recording the silent signal can be reduced, The voice coded audio signal can be recorded in the recording unit 11 for a long time.

Next, the reproducing operation will be described with reference to FIG. When the user of the mobile radiotelephone 36 according to the present embodiment confirms the contents of the call recorded in the recording unit 11 in the manner shown in FIG. 3, the user first selects the reproduction mode for the operation unit 12 in step 1b. Perform key input. When a key input for selecting a reproduction mode is made, the operation unit 12 controls the control unit 14.
Output a reproduction instruction signal to the device. The control unit 14 reads a reproduction control program stored in a ROM or a RAM provided therein in response to a reproduction instruction signal from the operation unit 12, and executes the subsequent reproduction operation.

When the reproduction control program is executed by the control unit 14, the recording information writing / reading unit 17 first reads the recording information from the recording unit 11 in step 2b in accordance with an instruction from the control unit 14. The record information read by the record information writing / reading unit 17 is composed of a sound coded audio signal and silent additional information as described above, and the record information creating / separating unit 16 indicates silence in step 3b. The ancillary information and the sound coded audio signal are separated. One of the separated
Who came with information is transmitted to the accessory information identification unit 18 by the recording information creation separation unit 16, by the accessory information identification unit 18 identifies the silence in step 4b are made. Then, the identified result is sent to the control unit 14 and returned to a silent encoded audio signal again.
Is transmitted to the audio processing circuit section 3 via the receiving side buffer circuit 7 together with the other coded audio signal separated by the above, and the audio processing circuit section 3 decodes these encoded audio signals in step 5b. . As described above, the recording unit 11
Is decoded, and then reproduced as a received voice via the D / A converter 8 and the speaker unit 9.

Step 6b is a step in which the control unit 14 monitors the reading of the recording information by the recording information writing / reading unit 17. When all the recording information is read from the recording unit 11, the control unit 14 forcibly reproduces the information. End the operation. Also,
Step 7b is a step in which the control unit 14 monitors the playback stop signal from the operation unit 12, and the user of the mobile radio telephone 36 performs a key input for selecting the playback stop mode using the operation unit 12, and controls the operation unit 12. When the reproduction stop signal is input to the unit 14, the control unit 14 forcibly ends the reproduction operation as in step 6a.

Embodiments 2. Next, another embodiment of the present invention will be described. In the above-described embodiment, by replacing the silent encoded audio signal with the additional information, the recording capacity of the silent encoded audio signal for the recording unit is reduced, and the necessary time for recording the necessary encoded audio signal to the recording unit is reduced. But this additional information,
Since only a few bits of data can indicate, for example, the silent state of the encoded audio signal, other information such as the line quality of the encoded audio signal to be recorded in the recording unit 11 is created as additional information. May be recorded on the recording unit 11 at the same time. In this way, information such as line quality can be recorded in the same recording unit as the encoded audio signal without providing an extra memory, and the encoded audio signal is recorded together with the encoded audio signal. information regarding channel quality of the audio signal, for example, can be displayed on the display unit 1 3.

In general, in the case of a mobile communication system in which a wireless communication line is set, a base station that assigns a communication line to each terminal that is connected to the wireless communication line and is talking with a communication partner. The line quality, pseudo error rate, etc. of the telephone line during the call are transmitted. In addition, when each terminal during a call by using such a wireless line records the contents spoken by the other party in a memory provided therein, the communication state with the other party is not considered at all, and the communication state is poor. Was recorded as it was, and when the recorded content was reproduced later, if the line quality was poor, the recorded content could not be heard. The mobile radiotelephone according to the present embodiment creates auxiliary information indicating line quality, pseudo error rate, and the like of a speech line in use, and records an encoded voice signal digitally demodulated by a radio circuit unit in a recording unit. By adding and recording this additional information, at the time of reproduction, the encoded audio signal recorded in the recording unit is decoded, and the corresponding encoded audio signal is added from the additional information added to the decoded encoded audio signal. The communication state of the signal is read, and the output level of the received voice reproduced is adjusted according to the communication state.

FIG. 6 is a block diagram showing the configuration of the mobile radio telephone according to this embodiment. The operation of the mobile radio telephone according to this embodiment will be described with reference to FIG. The same reference numerals in the drawings denote the same or corresponding parts, and a detailed description thereof will be omitted. Further, the control unit 14 of the mobile radiotelephone according to the present embodiment does not cause the attached information generation unit 15 to create the attached information based on the sound / non-sound information detected by the audio processing circuit unit 3 but makes the wireless circuit unit 5 Information generating unit 1 based on a control signal indicating the communication state of the communication line received via the
5 has an internal RO
M or RAM, and when the user performs a key input for selecting a recording mode with the operation unit 12, an operation of creating additional information based on the control signal is performed. That is, in the mobile radiotelephone according to the present embodiment, when the recording mode is selected by the operation unit 12, the control unit 14 first causes the attached information generation unit 15 to create attached information based on the control signal, and then creates and separates the recorded information creation and separation. The recording information is created by adding the additional information created by the additional information generating unit 15 to the encoded audio signal to be recorded in the recording unit 11 by the unit 16, and finally, the recording information writing / reading unit 17 controls the recording information by the control unit. Recording is performed on the recording unit 11 according to the recording timing instruction 14.

FIG. 7 is a data structure diagram showing the data structure of the record information recorded in the recording section of the mobile radio telephone according to the present embodiment. In FIG. After being decoded by the circuit unit 3, the coded voice signal output from the speaker unit 9 to the user as the received voice, and 22 is the coded voice signal 2
1 is additional information recorded in the recording unit 11 in addition to “1”. This additional information indicates the line quality (for example, 1 for a good state, 3 for a bad state, etc.) of the communication line set between the mobile radio telephone according to the present embodiment and the other party. However, information indicating various communication states during a call, such as a pseudo error rate, may be used. The additional information shown in FIG. 7 is added for each coded audio signal of one frame, and the line quality is indicated for the coded audio signal of each frame. If you create additional information for, you can further reduce the storage capacity,
Effective use of memory can be achieved.

At the time of reproduction, the encoded audio signal 21 to which the additional information 22 has been added is read from the recording unit 11, decoded by the audio processing circuit unit 3, and further subjected to digital processing. By adjusting the output level of the audio input / output unit based on the communication state of the encoded audio signal 21 identified from the control unit 22, the control unit 14 sends a received audio level instruction signal corresponding to the content of the attached information to the audio input / output unit. Output even if the call content of the other party recorded in a state where the line quality is poor can be reproduced as a received voice in a state that is easy to hear.

Further, in the mobile radio device according to the above-described embodiment, for example, when it is determined that recording is performed in a state where the line quality is poor, the output level of the received voice is automatically increased and the received voice reproduced is output, so that power consumption is reduced. Is larger than when the output level is low. In addition, since the output level is automatically adjusted, the user of the mobile radio telephone cannot know whether the communication state of the recorded coded voice signal is good or not, and cannot specify a place where the communication state is bad. This may lead to repeated recording in places with poor call conditions, use a rechargeable battery such as a secondary battery as the power supply, and
In the field of mobile radiotelephones that are always carried in use, this leads to extra power consumption and is less desirable. Therefore, the output level of the received voice reproduced at the time of reproducing the recorded content may be adjusted, and the communication state of the encoded voice signal identified from the attached information may be displayed on the display unit 13. In this case, the display means of the display unit 13 may be a display unit of a liquid crystal screen for displaying the dial number of the other party at the time of calling, or a notification sound generating means for generating a notification sound according to the communication state may be provided. Good.

Embodiments 3. Next, another embodiment of the present invention will be described with reference to FIGS. The mobile radio telephone according to the present embodiment is applied to a mobile communication system using a plurality of encoding schemes. In the mobile radio telephone according to the present embodiment, an encoded voice signal recorded in a recording unit is transmitted. At the time of reproduction, in order to realize accurate reproduction according to the encoding system of each encoded audio signal, auxiliary information indicating each encoding system is created. Then, this additional information is added to the corresponding coded audio signal and recorded in the recording section, and at the time of reproduction, the encoding method identified from this additional information is selected to decode the coded audio signal recorded in the recording section. .

FIG. 8 is a block diagram showing a schematic configuration of the mobile radio telephone according to the present embodiment, and FIG. 9 is a partial configuration diagram specifically showing a configuration of the control means. 8 and 9
, A plurality of encoding means 23a and 23b and decoding means 23c and 23d (for example, the method 1 is VSELP
System, and system 2 is a PSI-CELP system). During a call, the coding unit and the decoding unit that are the same coding system as the base station constituting the wireless communication line set with the other party are selected. The voice processing circuit unit 24 is internally configured as shown in FIG. 9, and is used for allocating a communication line (Common Signaling Channel) when setting a wireless communication line by a base station.
l: Hereinafter, referred to as CSC. ) By a control signal including a signal for specifying a coding scheme transmitted from the base station via, it is set between the communication partner from among the encoding means and decoding means the audio processing circuit section 2 3 The same coding method as that of the base station forming the communication line is selected, and the coded voice signal digitally demodulated by the wireless circuit unit 5 is recorded in the recording unit 11 in response to a recording instruction signal from the operation unit 12. A control unit 25 that performs a series of operation controls includes an auxiliary information generation unit 25 that generates auxiliary information indicating an encoding method of an encoded audio signal to be recorded in the recording unit 11 according to an instruction from the control unit 24.
Reference numeral 6 designates the coded audio signal to be recorded in the recording unit 11, adds the additional information generated by the additional information generation unit 25 to create recording information, and records the recording information read from the recording unit 11 with the encoded audio signal recording information creation separation unit for separating the information 27 recorded on the writing or recording unit 11 to the recording unit 11 the recording information created in the recording information operation component <br/> away portion 26 in accordance with an instruction from the control unit 24 The recording information writing / reading unit 28 for reading the recording information is read by the recording information writing / reading unit 27, and the additional information separated from the coded audio signal is input, and is recorded in the recording unit 11 from this additional information. This is an attached information identification unit that identifies the encoding method of the encoded audio signal.
The same reference numerals in the drawings denote the same or corresponding parts, and a detailed description thereof will be omitted.

Further, FIG. 1 0 is a system configuration diagram showing a mobile communication system in which mobile radio telephone 29 is used according to the present embodiment shown in FIG. 8, a plurality of base to the line control station 30 connected to a public network Station kn (n is an integer of 1 or more)
Are connected to each other to form a communication area 31 including a plurality of wireless zones En (n is an integer of 1 or more). Further, in FIG. 1 0, the base station k 1 is VSELP method, the base station k 2 is assumed to employ respectively an encoding scheme of PSI-CELP method, the mobile radio telephone 29 is first base station k 1 to form At the point A in the wireless zone, a call is made with the other party via the communication line T1, and after that, the mobile station moves to the point B in the wireless zone formed by the base station k2 while continuing the call (at the point B , the communication line T2 is used). intends line call.) shows.

Next, the operation will be described in detail with reference to FIGS. FIG. 11 is a flowchart showing a recording operation of the mobile radio telephone 29 according to the present embodiment shown in FIG. 8, and FIG. 12 is a flowchart showing a reproduction operation of the recorded contents. Will be described with reference to FIG. Note that FIG.
The flowchart shown in FIG.
In the state shown in FIG.
3 shows the operation when recording. At the point A, when the user of the mobile radiotelephone 29 communicating with the other party through the communication line T1 records the contents of the other party's call in the recording unit 11, the user first operates the operation unit 12 in the recording mode. Enter key to select (Step 1)
c). When a key input for selecting a recording mode is performed, the operation unit 12 outputs a recording instruction signal for instructing a recording operation to the control unit 24. When the recording instruction signal is input from the operation unit 12, the control unit 24 reads out a recording control program stored in a ROM or a RAM provided therein and executes the subsequent recording operation in addition to the call operation.

When the control unit 24 executes the recording control program by selecting the recording mode, first, it determines the encoding system of the encoded audio signal digitally demodulated by the wireless circuit unit 5 (step 2c). In the mobile radio telephone 29 according to the present embodiment, since the coding method is determined based on the coding method designation signal included in the control signal transmitted from the base station via the CSC, the communication line is Even in the case of switching, the coding method used by the base station constituting the switched wireless communication line can be determined when the new wireless communication line is set. Then, the control unit 24 first causes the additional information generation unit 25 to generate additional information according to the result of the determination, and then adds the additional information indicating the encoding method to the encoded audio signal by the recording information creation / separation unit 26. Create record information,
Finally, the recording information is written into the recording unit 11 by the recording information writing / reading unit 27 (step 3c). Step 4c is a step in which the control unit 24 monitors the data amount recorded in the recording unit 11 by the recording information writing / reading unit 27, and the recording unit 11 records a data amount of a predetermined value or more in the recording unit 11. Then, the control unit 24 forcibly ends the recording operation. Step 5c is a step in which the control unit 24 monitors the recording stop signal from the operation unit 12,
9, the user inputs a key to select a recording stop mode using the operation unit 12, and when a recording stop signal is input from the operation unit 12 to the control unit 24, the control unit 24 performs a recording operation in the same manner as in step 4c. Force termination.

Step 6c is a step of monitoring the switching of the wireless communication line. When the wireless communication line T1 set between the mobile telephone and the other party is switched to the wireless communication line T2 by the movement of the mobile wireless telephone 29, The control unit 24 returns to step 2c and returns to the base station via the CSC again.
To determine the encoding method used in the base station k 2 constituting a wireless communication line T2 has been switched on the basis of the transmitted control signals from k 2. If the wireless communication line T1 is not switched, steps 3c to 5c are continued until the recording is completed. The radio communication line between the mobile radiotelephone 29 and the other party at the position of the point C in FIG. 10 can be set to either T1 or T2, but usually the line control station 30 to which each base station is connected. (network side), the channel use state of each base station, for example, monitors the traffic state, but to be connected to any of the radio speech channel by the network side determines via the base station k 1 or the base station k 2 Mobile radio telephone 2
9. This instruction is performed by the control signal via the CSC. In addition, each base station detects the radio wave intensity of the transmission signal transmitted from the mobile radio telephone 29 to each base station k1 or k2 , and connects to the wireless communication line of the base station having the higher radio wave intensity. You may instruct. FIG.
Is a data configuration diagram showing a data configuration of recording information recorded in the recording unit 11 as described above.

In FIG. 13, reference numeral 32 denotes an encoded audio signal of n frames (n is an integer of 1 or more) recorded in the recording unit 11 for each frame, and 33 denotes an encoded audio signal 3
This is the additional information added to No. 2. In FIG. 13, V is VSE
LP scheme and P indicate PSI-CELP scheme. Auxiliary information 33 indicating an encoding method, as shown in Figures 1 to 3 are respectively added to each coded speech signal for one frame.

FIG. 14 shows the data recorded in the recording unit 11.
FIG. 14 is a data configuration diagram showing another data configuration of recording information. Figure
At 13, additional information is created for each frame, and
Is added to the coded audio signal of each frame
As a result of the identification of the encoding system by the control unit 24, the encoding system is changed.
, That is, the wireless communication line uses another encoding method.
Is switched to the calling line of the base station (see FIG. 10).
As shown, the position of the mobile radiotelephone 29 isAFrom a pointCTo a point
Move), the encoded audio signal of the first frame
The additional information may be added only to the issue. FIG.4
During,kIndicates the encoding method, and this encoding methodkButk+1
When the mode is switched to
The report P is added.

Next, the reproducing operation will be described with reference to FIG. When the user of the mobile radiotelephone 29 according to the present embodiment confirms the call content recorded in the recording unit 11 in the manner shown in FIG. 11, the user first performs a key input to the operation unit 12 to select a reproduction mode. (Step 1d). Operation unit 1
2 outputs a reproduction instruction signal to the control unit 24 when a key input for selecting a reproduction mode is made. The control unit 24 reads a reproduction control program stored in a ROM or a RAM provided therein in response to a reproduction instruction signal from the operation unit 12, and executes the subsequent reproduction operation.

When the reproduction control program is executed by the control unit 24, first, the recording information writing / reading unit 27
In response to the instruction of 4, for example, the recording information shown in FIG. Next, the read recording information is separated by the recording information creation / separation unit 26 into additional information 33 indicating an encoding method and an encoded audio signal 32 of the encoding method indicated by the additional information 33. One coded speech signal 32 that has been separated is transmitted via the reception buffer circuit 7 to the audio processing circuit unit 2 3, but is decoded to a digital audio signal by the selected decoding means described later, the decoding The selection of the conversion means is performed based on the identification of the attached information in the attached information identification unit 28. That is, the attached information identification unit 28 identifies the encoding method from the other attached information 33 separated by the recording information creation / separation unit 26, and the control unit 24 outputs one of the encoded audio separated according to the identification result. Select a decoding means corresponding to the signal encoding method (step 2
d). Selection of decoding means is performed by the control unit 24 outputs the coding scheme selection signal to the audio processing circuit section 2 3. Then, in terms of the recording information creation separation section 26 one of the encoded audio signal 32 separated by it is decoded into digital audio signals by decoding means selected by the control unit 24 (FIG. 13, the encoded data 1 And 2 are V
The data is decoded by the SELP method, and the encoded data n is PSI-
Decoded by the CELP method. ). The digital audio signal decoded by the selected decoding means is
The received voice is reproduced through the / A converter 8 and the speaker unit 9 (step 3d).

Step 4d is a step in which the control unit 24 monitors reading of the recording information by the recording information writing / reading unit 27. When all the recording information is read from the recording unit 11, the control unit 24 forcibly reproduces. End the operation. Also,
Step 5d is a step in which the control unit 24 monitors the reproduction stop signal from the operation unit 12, and the user of the mobile radio telephone 29 according to the present embodiment performs a key input for selecting the reproduction stop mode using the operation unit 12, When a reproduction stop signal is input from the operation unit 12 to the control unit 24, the control unit 24
Terminates the reproducing operation forcibly as in step 4d.

Embodiments 4. In the mobile radio telephone according to the above embodiment, all the encoded audio signals digitally demodulated by the radio circuit unit 5 are recorded in the recording unit 11, but they are necessary for decoding when recording in the recording unit. (A class) and other data (B class: data relating to sound quality, etc.), and only the A class data may be selected and recorded in the recording unit 11 (memory saving mode). . For example, the memory saving mode can be selected when the user gives a recording instruction from the operation unit 12. By doing so, the received voice at the time of reproduction slightly deteriorates.
1 can reduce the recording capacity of the coded audio signal recorded in
Further, the encoded audio signal for a longer time can be recorded in the recording unit 11.

FIG. 15 is a data structure diagram showing the data structure of the record information recorded in the recording unit 11 of the mobile radio telephone according to the present embodiment. Indicates recording information recorded in the recording unit 11 when is selected by the operation unit 12. As shown in FIG. 15, when the memory saving mode is selected, only the coded data of the A class is recorded in the recording unit 11.

[0046]

[0047]

As described above , according to the first aspect of the present invention, a radio circuit unit for demodulating a modulated wave audio signal from a base station received via a communication line into an encoded audio signal, An audio processing circuit for decoding the coded audio signal demodulated by the radio circuit into a digital audio signal; and a receiver corresponding to the modulated wave audio signal from the digital audio signal decoded by the audio processing circuit. An audio input / output unit that outputs audio, an auxiliary information generation unit that generates auxiliary information indicating a communication state of the modulated wave audio signal based on the line information of the communication line transmitted from the base station, and an auxiliary information generation unit. A recording unit that records the encoded audio signal to which the additional information generated by the unit is added; and the encoded sound when the encoded audio signal recorded in the recording unit is reproduced into the received voice. A control unit for identifying the communication state of the encoded audio signal to be read and reproduced by reading out the attached information recorded in addition to the signal, and adjusting an output level of the received voice reproduced according to the identification result; Was established,
It is possible to record the contents of a long-time call in the recording unit, and it is possible to adjust the output level of the received voice according to the line quality, pseudo error rate, etc. of the coded audio signal recorded when the recording information is reproduced in the recording unit. .

According to the second aspect of the present invention, the control unit displays the communication state of the coded voice signal reproduced in the received voice on the display unit. The line quality, pseudo error rate, etc. of the coded voice signal are displayed or reported to the user, and the communication state at the recorded position can be recognized.

According to the third aspect of the present invention, there is provided a radio circuit unit for receiving a modulated wave audio signal transmitted from a base station and demodulating the modulated audio signal into an encoded audio signal, and a plurality of decoding means. An audio processing circuit unit that decodes the encoded audio signal demodulated by the wireless circuit unit into a digital audio signal,
A voice input / output unit that outputs a received voice corresponding to the modulated wave voice signal from the digital voice signal, and a code of the coded voice signal from the coded information of the modulated wave voice signal transmitted from the base station. Less auxiliary information indicating
When reading the encoded audio signal from the recording unit that records the encoded audio signal to which the additional information is added, and reproduces the received audio, from the recording unit that records the encoded audio signal to which the additional information is added. An additional information identification unit for reading out the additional information recorded in addition to the encoded audio signal and identifying an encoding method of the encoded audio signal;
And a control unit for decoding the coded audio signal recorded in the recording unit by the predetermined decoding unit corresponding to the encoding method identified by the attached information identification unit into the digital audio signal. Even if the communication line is switched to another base station line while recording the content and multiple types of coded audio signals coded by different coding methods are recorded, each coded voice signal is converted to that coding method. The recorded contents can be decoded by the corresponding decoding means so that the recorded contents can be continuously reproduced, and the recording unit can record the encoded audio signal for a long time.

[0050]

[Brief description of the drawings]

FIG. 1 is a block diagram showing a mobile radio telephone according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a control unit of the mobile radio telephone shown in FIG.

FIG. 3 is a flowchart showing a recording operation of the mobile radio telephone shown in FIGS. 1 and 2;

FIG. 4 is a flowchart showing a reproducing operation of the mobile radio telephone shown in FIGS. 1 and 2;

FIG. 5 is a data configuration diagram of recording information recorded in a recording unit of the mobile radio telephone shown in FIGS. 1 and 2.

FIG. 6 shows an embodiment of the present invention. 2 is a block diagram showing a control unit of the mobile radio telephone according to No. 2; FIG.

FIG. 7 is a data configuration diagram of recording information recorded in a recording unit of the mobile radio telephone shown in FIG.

FIG. 8 shows an embodiment of the present invention. FIG. 3 is a block diagram showing a mobile radio telephone according to Embodiment 3;

FIG. 9 is a block diagram showing a control unit of the mobile radio telephone shown in FIG.

FIG. 10 is a system configuration diagram showing a mobile communication system to which the mobile radio telephone shown in FIGS. 8 and 9 is applied.

FIG. 11 is a flowchart showing a recording operation of the mobile radio telephone shown in FIGS. 8 and 9;

FIG. 12 is a flowchart showing a reproducing operation of the mobile radio telephone shown in FIGS. 8 and 9;

FIG. 13 is a data configuration diagram of recording information recorded in a recording unit of the mobile radio telephone shown in FIGS. 8 and 9;

FIG. 14 is another data configuration diagram of recording information recorded in the recording unit of the mobile radio telephone shown in FIGS. 8 and 9.

15 is a data configuration diagram of the record information recorded in the recording unit of the mobile radio telephone device according to the present invention when the memory saving mode selection.

[Explanation of symbols]

 3, 23 voice processing circuit section 5 wireless circuit section 9 speaker section 10 control means 11 recording section 12 operation section 13 display section 14, 24 control section 15, 25 attached information generation section 18, 28 attached information identification section

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 7/26 G10L 11/06 G10L 19/00 H04M 1/65

Claims (3)

(57) [Claims] 1. A radio circuit unit for demodulating a modulated wave audio signal received from a base station via a communication line into an encoded audio signal, and a digital audio signal demodulated by the radio circuit unit. An audio processing circuit for decoding into a signal,
A voice input / output unit that outputs a received voice corresponding to the modulated wave voice signal from the digital voice signal decoded by the voice processing circuit unit, and the voice input / output unit based on the line information of the communication line transmitted from the base station. An additional information generation unit that generates additional information indicating a communication state of the modulated wave audio signal; a recording unit that records the encoded audio signal to which the additional information generated by the additional information generation unit is added; When the coded audio signal recorded in the section is reproduced into the received voice, the communication state of the coded audio signal which is read out and read out from the attached information added to the coded audio signal and reproduced is identified. And a control unit for adjusting an output level of the received voice reproduced according to the identification result. 2. A mobile radio telephone of the control unit according to the first claims, characterized in that on the display unit of the communication state of the encoded audio signal reproduced in the received voice. 3. A wireless circuit unit for receiving a modulated wave audio signal transmitted from a base station and demodulating the modulated wave audio signal into an encoded audio signal, and a plurality of decoding means are provided, and the code demodulated by the wireless circuit unit is provided. A voice processing circuit for decoding the converted voice signal into a digital voice signal, a voice input / output unit for outputting a received voice corresponding to the modulated wave voice signal from the digital voice signal, and the voice input / output unit transmitted from the base station. From the encoded information of the modulated wave audio signal, additional information indicating the encoding method of the encoded audio signal is converted into at least a frame in which the encoding method changes.
And auxiliary information generation unit which generates for each, when reproducing the received voice from the recording unit for recording the encoded audio signal in which the accessory information added reads the coded speech signal, to the encoded audio signal An additional information identifying unit that reads the additional information recorded in addition and identifies the encoding system of the encoded audio signal; and a predetermined decoding unit corresponding to the encoding system identified by the additional information identifying unit. A control unit for decoding the encoded audio signal recorded in the recording unit into the digital audio signal.