JPH07235977A - Communication equipment with recording function - Google Patents

Abstract

PURPOSE:To form communication equipment with a simple structure capable of performing incoming call response simultaneous recording. CONSTITUTION:When an incoming call is received in an automatic answering recording mode, a response message stored in memory 13 for recording is read out at the timing of extension processing in the restoration of reception sound data by a burst signal processing part 23, and a message sent from a caller is written on the memory 13 for recording at the timing of compression processing when transmitted sound data is generated. Therefore, the incoming call response simultaneous recording can be performed even without providing a reproduction circuit and a recording circuit separately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital communication system for performing bidirectional voice transmission over a wireless line by a digital system.
The present invention relates to a communication device such as a cordless telephone device or a digital portable telephone device, and particularly to a communication device having a recording / playback function.

[0002]

2. Description of the Related Art In recent years, two-way voice transmission between a base unit and a handset by a wireless line is performed by a digital system, and the handset can be used outdoors like the existing mobile telephones. The PHP (Personal Handy Phone) system that has been developed is being put to practical use. When the digital cordless telephone device of the PHP system is used indoors, both the parent device and the child device can talk in the same form as the current cordless telephone device.
When used outdoors, for example, install a large number of wireless base stations (corresponding to wireless base stations of mobile phone devices) in public telephone boxes scattered throughout the city, and connect each to a public telephone line. Incidentally, by assuming this wireless base station as, so to speak, a base unit of a cordless telephone, it becomes possible to make a call using the handset even when out of the office.

[0003]

By the way, it is desired to add the recording / playback function provided in the conventional analog cordless telephone apparatus also to the above-mentioned digital cordless telephone apparatus. For example, in the case of recording an answering machine, a recording / playback function for performing so-called simultaneous recording of incoming call, such as recording a voice signal of a caller at the same time as playing back a response message of a user when an incoming call arrives, is of course desired.

Therefore, when the recording / playback function for performing such simultaneous recording of incoming call response is to be added to the above-mentioned digital cordless telephone device, the first conceivable idea is to apply it to the current analog cordless telephone device. It is to use the existing structure as it is. That is, an IC memory for storing a response message, an IC memory for recording a call or a tape recorder and a voice codec circuit for reading and writing voice data to and from the IC memory used in the current analog cordless telephone device are built in the device. All you have to do is do it.

However, if a circuit for reproducing a response message for simultaneous recording of an incoming call and a circuit for recording and reproducing a message from a caller are provided independently of each other, the circuit scale is increased, and the device is downsized and reduced in size. It is an obstacle to cost reduction.

An object of the present invention is to provide a communication device capable of recording and reproducing a response message or a caller's message without providing a dedicated circuit for recording and reproducing.

[0007]

DISCLOSURE OF THE INVENTION According to the present invention, burst audio data is compressed at a predetermined time interval to generate a transmission burst signal and is received at a timing different from the transmission timing of the transmission burst signal. In a communication device including a burst signal processing unit for time-expanding a signal to restore received voice data, a first storage unit for storing a response message and a second storage unit for storing a message of a calling party.
Storage means for reproducing the response message stored in the first storage means in the decompression processing circuit section in the burst signal processing section, and storing the message of the caller in the second storage means. The recording is performed by the compression processing circuit section in the burst signal processing section.

[0008]

In the present invention, the decompression circuit section in the burst signal processing section originally provided in the communication device reproduces the user response message stored in the first storage means, and the compression processing circuit section reproduces the second response message. Since the caller's message is recorded in the storage means, the timing of reproducing the response message and the timing of recording the message of the caller are deviated in time. Therefore, simultaneous incoming call recording can be realized without providing a dedicated recording / reproducing circuit, and the circuit of the communication device can be simplified.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. This embodiment will be described focusing on an embodiment in which the present invention is applied to a master unit of a digital cordless telephone device (PHP), and further to an embodiment applied to a slave unit of the digital cordless telephone device. To do.

First, FIG. 1 is a block diagram showing a hardware configuration of the entire apparatus in an embodiment in which the configuration of the present invention is applied to a master unit of a digital cordless telephone system.
As shown in the figure, the main unit of the digital cordless telephone device is a line interface unit 1, a line switching unit 2, a handset 3, a speaker 4, a microphone 5, a system control unit 6, a key input unit 7, a hook switch 8, Display unit 9, ringing tone generation unit 10, DTMF code memory (DT
MF is Dual Tone Multiple Frequency) 11, DTM
The F receiver 12, the recording memory 13, and the wireless communication device unit 20 are included in the configuration, and the wireless communication device unit 20 includes a communication control unit 21, an audio codec unit 22, and a burst signal processing unit. 23, digital modulation / demodulation unit 2
4, an RF section (high frequency section) 25, and an antenna 26.

Here, the line interface unit 1 performs an interface operation between the master unit of the digital cordless telephone device and an outside line (public telephone line). For example, when a call is received from the outside line. , A ringer signal is received from the outside line and a ringer detection signal is given to the system control section 6. On the other hand, when a line connection signal is given from the system control section 6, the built-in line switch is turned on. Is connected, and the voice signal of the caller coming from the outside line is supplied to the line switching unit 2 with the connection of this line (the opposite operation when making a call). Further, the line switching unit 2 receives the voice signal of the calling party given from the line interface unit 1 from the handset 3
Or the recording memory 1 via the wireless communication unit 20.
3 or a slave unit (not shown in the figure) is switched according to the type of the line switching signal supplied from the system control unit 6, and the ringing tone signal generated by the ringing tone generating unit 10 is switched to the speaker 4. To the speaker 4 or the voice signal of the caller given from the recording memory 13 via the wireless communication unit 20 or a response message of the user input from the microphone 5 or the like.
Whether to give it to the recording memory 13 via the like is also switched according to the type of the above-mentioned line switching signal.

On the other hand, the system control unit 6 controls the entire base unit of the digital cordless telephone device, and the operation mode of the device is set to a call mode for the user to directly receive a telephone call from an outside line. In this case, when the ringer detection signal is given from the line interface section 1, the ringing tone generating section 10 is controlled to generate the ringing tone signal, and the ringing tone signal thus generated is output to the speaker. 4, a line switching signal for emitting a sound is given to the line switching unit 2, and thereafter, when the user picks up the handset 3 and the hook switch 8 is turned off, the control of the ringing tone generation unit 10 is released. At the same time, a line connection signal is given to the line interface section 1 to connect the line, and the caller's The voice signal adapted to provide a line switching signal to sound from the handset 3 to the outside line switching unit 2.

Further, when the operation mode of the device is set to the answering machine recording mode for recording a telephone call from an outside line when the user is absent, the system control section 6 outputs a ringer detection signal from the line interface section 1. Is given, a line connection signal is immediately given to the line interface unit 1 to connect the line, and at the same time as the connection of this line,
The communication control unit 21 controls the burst signal processing unit 23 of the wireless communication unit 20 to provide response message data (described later) stored in the recording memory 13, and at the same time, controls the connection of the line. A line switching signal for giving the voice signal of the calling party given to the voice codec unit 22 of the wireless communication unit 20 is given to the line switching unit 2.

As the operation modes of the apparatus, in addition to the above-mentioned call mode and answering machine recording mode, a registration mode for registering a response message in the recording memory 13,
A reproduction mode for reading and reproducing the voice signal data of the caller written in the same recording memory 13 is prepared, and the system control unit 6 sets the operation mode to the registration mode. Is applied to the line switching unit 2 for supplying the user's response message input from the microphone 5 or the like to the voice codec unit 22 of the wireless communication unit 20, while the operation mode is set to the reproduction mode. In this case, the communication control unit 21 controls to read out the voice signal data of the caller written in the recording memory 13 and give it to the burst signal processing unit 23 of the wireless communication unit 20. Also, when the operation mode of the device is set to the call mode,
When the user operates the key input unit 7 to make a call, the system control unit 6 causes the display unit 9 to display the telephone number related to the operation of the key input unit 7 and displays the key code corresponding to the telephone number. DTMF code memory 1
1 and further, a control of supplying a digital DTMF code corresponding to the key code to the voice codec unit 22 of the wireless communication unit 20 is performed.

The operation modes are set by the user operating the key input unit 7, inputting a key code given from the communication control unit 21 of the wireless communication unit 20, or
Analog DTM given from audio codec unit 22
This is performed by inputting a key code obtained by receiving the F code by the DTMF receiver 12.

The wireless communication unit 20 performs a two-way voice transmission by a digital line with a slave unit of the digital cordless telephone device by a digital system.
The communication control unit 21 among them performs synchronization control of the voice codec unit 22, the burst signal processing unit 23, the digital modulation / demodulation unit 24, and the RF unit 25 by the timing control data given from the system control unit 6, and this synchronization control is performed. Enables transmission / reception of voice information between the master unit and the slave units (up to 4 units), using 4-channel TDMA / using a single carrier wave.
The TDD method (4 channel time division multiple access / time division duplex method) is used.

That is, when the master unit of this digital cordless telephone apparatus transmits voice information to the slave unit, first, the voice codec unit 22 performs ADPCM on the voice signal of the caller given from the line switching unit 2. Transmission voice data is generated by encoding in real time by a method (adaptive differential pulse code modulation method), and then the burst signal processing unit 23 compresses the generated transmission voice data at predetermined time intervals. Then, a transmission burst signal is generated (details will be described later), and the digital modulation / demodulation unit 24 further modulates the generated transmission burst signal by the π / 4 shift QPSK method (π / 4 shift quaternary phase modulation method). Then, finally, the RF unit 25 frequency-converts the modulated transmission burst signal into a predetermined carrier wave and then amplifies the power. , Digitized voice information,
It is adapted to be transmitted to the slave unit at a predetermined time slot via the antenna 26.

On the other hand, when the master unit of this digital cordless telephone apparatus receives voice information to be transmitted from the slave unit according to the same principle as above, first, the RF unit 2
5 high-frequency-amplifies the signal input from the antenna 26 in a time slot different from the time slot used when transmitting from the master unit to the slave unit, and then frequency-converts the signal into a predetermined baseband. , The frequency-converted signal is demodulated into a reception burst signal by the π / 4 shift QPSK method described above, and the burst signal processing unit 23 further time-expands the demodulated reception burst signal into reception voice data. Then, the audio codec unit 22 finally restores the restored received audio data by the above-mentioned A.
By decoding in real time by the DPCM method,
The voice information transmitted from the child device is converted into an analog voice signal and given to the line switching unit 2.

In addition to the above control, the communication control unit 21 adds a header indicating the type of the transmission burst signal to the transmission burst signal generated at each predetermined time slot in the burst signal processing unit 23. At the same time, the header added to the received burst signal demodulated by the digital modulation / demodulation unit 24 is extracted from the burst signal processing unit 25 and given to the system control unit 6. In addition, from the slave unit, the antenna 26, the RF unit 25,
The above-mentioned key code for operation mode setting, which is given through the digital modulation / demodulation unit 24 and the burst signal processing unit 23, is given to the system control unit 6.

The voice codec unit 22 encodes a user response message and a caller's message (voice signal) given from the line switching unit 2 and the like under the control of the system control unit 6, and the encoded response. message·
Burst signal processing unit 23 for data and voice signal data
And the response message data and voice signal data given from the recording memory 13 to the burst signal processing unit 23 under the control of the system control unit 6 and the communication control unit 21 are decoded, and the decoded response message And a voice signal to the line switching unit 2 and the like. Also, the voice codec unit 22 is the line interface unit 1
An analog DTMF signal for operating mode setting, which is given from an external line via the, is given to the DTMF receiver 12.

Next, FIG. 2 is a block diagram showing an actual hardware configuration of the burst signal processing unit 23 shown in FIG. Further, FIG. 3 similarly shows a 4-channel TDMA realized by the burst signal processing unit 23 shown in FIG.
It is a figure which shows the slot arrangement | positioning of / TDD system.

As shown in FIG. 2, the burst signal processing unit 23 includes a first shift register 31, a first P / S converter (P / S converter is a parallel / serial converter) 3.
2, a first register 33, a scrambler 34, a descrambler 35, a unique word detection unit (hereinafter referred to as UW detection unit) 36, a channel type detection unit (hereinafter referred to as CI detection unit) 37, a second register 38 , A second shift register 39, and a second P / S converter 40.

Here, the first shift register 31 sequentially accumulates the serial transmission audio data provided from the audio codec section 22 in real time, sets the serial transmission audio data in a parallel state, and outputs the first P / P. It is given to the S converter 32. Further, the first P / S converter 32 converts the parallel transmission voice data supplied from the first shift register 31 into serial transmission voice data at high speed and supplies the serial transmission voice data to the scrambler 34. That is, the first shift register 31 and the first P /
Due to the function of the S converter 32, the audio codec unit 22
The transmission voice data given by the above is compressed on the time axis.

On the other hand, the first register 33 has a scrambler 34 which adds data to the beginning of the compressed transmission voice data obtained by the first P / S converter 32, that is, the type of transmission data. (CI (channel type) data for indicating the type in this case is voice data) and SA (low-speed associated control channel, to be exact, SACCH) data such as low-speed packet data are stored. These CI and SA are communication control unit 2
Given from 1.). Further, from the communication control unit 21 to the scrambler 34, a header including a UW (unique word) for indicating the beginning portion is given to the transmission voice data in which the CI and SA are added. It is like this. As a result, in the scrambler 34, the transmission voice data in which the header including UW, CI, and SA are added in order from the beginning can be obtained. Hereinafter, the parity part is added to the last part of the transmission voice data in this state. 240 bits / bit with CRC (Cyclic Redundancy Check) bit for checking
A transmit burst signal with a transmission rate of 625 microseconds is generated.

That is, referring to FIG. 3, the burst signal processing unit 23 converts the transmission voice data of 5 milliseconds from the transmission burst signal of 625 microseconds (slot T) corresponding to 1/8 of the transmission voice data. ₍ Corresponding to ₁ , T ₂ , T ₃ , or T ₄ ) is generated, and thereafter, this transmission burst signal is transmitted via the digital modulation / demodulation unit 24, RF unit 25, and antenna 26 under the control of the communication control unit 21. It is transmitted to any of the four slave units (a, b, c, or d).

On the other hand, the received burst signal (slot R ₁ shown in FIG. 3,
(Corresponding to R ₂ , R ₃ , or R ₄ ) is given to the descrambler 35, and the UW detector 36 and the CI detector 37. The received voice data obtained by removing the header including UW, CI, SA, CRC, etc. from the signal is given to the second shift register 39, and the UW detection unit 36
The CI detector 37 detects the UW and CI, and supplies them to the communication controller 21. The second register 38 is also used by the descrambler 3
The SA removed by 5 is individually given to the communication control unit 21. At this time, the communication control unit 2
The system control unit 6 recognizes the type of the received data (in this case, voice data) by the CI given to 1, the beginning of the received voice data by the UW, and the packet data by SA. become.

On the other hand, the second shift register 39 sequentially accumulates the high-speed serial reception voice data supplied from the descrambler 35, and at the moment when the accumulation of the reception voice data is completed, the serial reception is completed. The audio data is provided in parallel to the second P / S converter 40. In addition, the second P / S converter 4
0 is adapted to low-speed convert the high-speed parallel reception voice data given from the second shift register 39 into the serial reception voice data and give it to the voice codec section 22. That is, the 240-bit / 625-microsecond received voice data signal provided from the descrambler 35 is expanded on the time axis by the functions of the second shift register 39 and the second P / S converter 40. As a result, the reception burst signal given from the digital modulation / demodulation unit 24 is converted into reception voice data of a transmission rate that can be decoded by the voice codec unit 22.

The compressed data obtained by the first P / S converter 32 is written in the recording memory 13 under the control of the communication control unit 21, and the recording is performed. The data read from the memory 13 under the control of the communication controller 21 is the scrambler 34.
Alternatively, it is given to the second shift register 39 and sent to the speaker 4 of the slave unit or the master unit or the outside line.

Next, the operation of the master unit of the digital cordless telephone device configured as described above will be described. Here, the operation of setting the operation mode for the digital cordless telephone device and the operations of the registration mode and the answering machine recording mode after setting the operation mode will be particularly described.

First, the operation mode setting for this digital cordless telephone device is performed by the key input unit 7, the outside line,
Or it is performed by a child machine. That is, the key input unit 7
To set the operation mode by, the user operates a mode key (not shown) of the key input unit 7 to select a desired operation mode, and the system control unit 6 selects the operation mode related to the user's selection. It is performed by determining. To set the operation mode by the outside line, the user operates a push button (not shown) such as a public telephone (not shown) of the outside line and designates a desired operation mode by a personal identification number or the like. An analog DTMF signal for setting the operation mode according to the designation is transmitted from the outside line through the line interface unit 1, the line switching unit 2, and the voice codec unit 22.
It is given to the TMF receiver 12 and further this DTMF
When the key code corresponding to the DTMF signal is given from the receiver 12 to the system control unit 6, the system control unit 6 discriminates the operation mode indicated by the key code. On the other hand, the user sets the operation mode by operating the mode key (not shown) of the key input unit (not shown in the figure) of the child device in the same manner as described above. .

When the operation mode of the apparatus is set to the registration mode as described above, the system control section 6 sends a line switching signal for giving the voice codec section 22 a user's response message input from the microphone 5. The burst signal processing unit 2 supplies the line switching unit 2 with the response message provided to the voice codec unit 22 and encodes the response message into response message data.
3 is controlled. Furthermore, the first shift register 31 and the first P / S of the burst signal processing unit 23 are provided.
The response message data to be compressed by the converter 32 is controlled at high speed by controlling the communication control unit 21 to a predetermined address (response message storage area) of the recording memory 13 (details will be described later). To).
Further, when the registration mode is set by the outside line, the system control unit 6 gives a line switching signal for giving the voice codec unit 22 a user's response message given from the public telephone or the like of the outside line via the line interface unit 1. Is supplied to the line switching unit 2 and the response message supplied to the voice codec unit 22 is encoded into response message data and then supplied to the burst signal processing unit 23. The response message data is controlled to be written at a predetermined address of the recording memory 13 at a high speed in the same manner as when the registration mode is set by. On the other hand, when the registration mode is set by the slave unit, the system control unit 6 sends a response message from the user to the burst signal processing unit 23 via the antenna 26, the RF unit 25, and the digital modulation / demodulation unit 24. The data is passed through the descrambler 35 and then written at a predetermined address in the recording memory 13 at high speed.

Then, after the response message is actually registered in the registration mode, the operation mode is set to the answering machine recording mode, and when a call is received from an outside line in this state,
When the ringer detection signal is given from the line interface unit 1, the system control unit 6 immediately gives the line interface unit 1 a line connection signal to connect the line,
Simultaneously with the connection of this line, by controlling the communication control unit 21, the response message data is read (reproduced) from a predetermined address of the recording memory 13 at high speed, and the read response message data is burst signal processed. The second shift register 39 and the second P of the section 23.
After the expansion processing is performed by the / S converter 40, the response message data after the expansion processing is controlled to be given to the voice codec unit 22. Simultaneously with this control, the system control unit 6 gives the line switching unit 2 a line switching signal for giving the voice codec unit 22 a message of the caller given in connection with the line connection, whereby the voice codec is supplied. By controlling the communication control unit 21, the audio signal data for 5 milliseconds given from the unit 22 to the burst signal processing unit 23 is controlled by the first shift register 31 and the first shift register 31.
After being compressed on the time axis by the P / S converter 32, the compressed audio signal data is stored in another address of the recording memory 13 (an address different from the predetermined address where the response message data is stored). ) Is written at high speed.

That is, the response message data is read from the recording memory 13 by the second shift register 3
9 and the second P / S converter 40 performs the decompression process when the received voice data is restored, while the voice signal data is written in the recording memory 13 by the first shift register 31 and the second shift register 31. This is performed at the timing of compression processing when the transmission voice data is generated by the P / S converter 39 of No. 1. In addition, the timing of the decompression process at the time of decompressing the received voice data and the timing of the compression process at the time of generating the transmission voice data at this time are performed using different time slots, and are deviated in time (FIG. As a matter of course, the timing of reproducing the response message data and the timing of recording the voice signal data are also deviated in time. Therefore, the burst signal processing unit 23 and the one recording memory 13 included in the digital cordless telephone device can be used to record an incoming call at the same time, and a dedicated message for recording and reproducing a response message and a caller's message can be recorded. No circuit is needed.

The master unit of the digital cordless telephone system of this embodiment is also capable of simultaneously recording an incoming call for a call from a slave unit. In this case, the response message stored in the response message storage area of the recording memory 13 is reproduced at the compression processing timing when the transmission voice data is generated, and the response message storage area of the recording memory 13 is stored. The audio signal from the slave unit may be recorded at the expansion processing timing when the received audio data is restored. More specifically, when there is a call from the handset in a state where the answering machine recording mode is set, the communication control unit 21 is controlled and the response message stored in the response message storage area of the recording memory 13 is stored. At the transmission timing (slot T
_1, T _2, T ₃ or reads one by 5 milliseconds in accordance with the T _4),, UW, given with CI data and SA data to the scrambler 34, CRC scrambler 34
After adding bits and the like, the signal is transmitted from the antenna 26 to the slave unit via the digital modulation / demodulation unit 24 and the RF unit 25. At the same time, the antenna 26 and the RF unit 2
5, the received voice data in the burst signal received via the digital modulator / demodulator 24, that is, the received voice data output from the descrambler 35 is stored in the incoming message storage area of the recording memory 13 at high speed. . Reception timing of the burst signal received via the antenna 26 and RF unit 25, the slot corresponding to the transmission slot (when the transmission slot is T _1, the slots R ₁₎ because it is, by the above-described process, the slave unit Simultaneous recording of incoming calls for calls from can be performed.

In addition, regarding the operation when the operation mode of the apparatus is set to the reproduction mode, when the reproduction mode is set by the key input unit 7 or the outside line, the system control unit 6 The control for reproducing the voice signal data is performed in the same manner as the reproduction of the response message data in the answering machine recording mode described above, and when the setting is performed by the slave unit, the system control unit 6 causes the recording memory 13 to perform recording. The voice signal data read from the voice signal data is given to the digital modulation / demodulation unit 24 via the scrambler 34, and then the voice signal data is controlled to be given to the slave unit via the RF unit 25 and the antenna 26. Will be played on the child device.

Next, an embodiment in which the configuration of the present invention is applied to a slave unit of a digital cordless telephone system will be described. FIG. 4 is a block diagram showing the hardware configuration of the entire apparatus of the second embodiment in which the configuration of the present invention is applied to a child device of a digital cordless telephone device.

As shown in the figure, the slave unit of the digital cordless telephone system of the second embodiment is provided with a receiving speaker 4
3a, transmission microphone 43b (these correspond to the above-mentioned handset), speaker 44, system control unit 4
6, key input section 47, display section 49, recording memory 53,
And a radio communication unit 60 (communication control unit 61, voice codec unit 62, burst signal processing unit 63, digital modulation / demodulation unit 64, RF unit 65, and antenna 66).

Since the slave unit of this digital cordless telephone system has the radio communication unit 60 having the same structure as the master unit, the burst signal processing unit 63 included therein has
By connecting one recording memory 53 for obtaining the recording / playback function and performing the same processing as the incoming simultaneous recording processing for the call from the child device in the parent device, the response of the user from the recording memory 53 is obtained. Message playback,
Simultaneous processing with the recording of the voice signal of the calling party in the recording memory 53 can be performed without providing a dedicated recording / reproducing circuit as in the case of the above-described parent device.

Next, FIG. 5 shows a three-channel TDMA / FD applied to a digital portable telephone device for mobile communication.
It is a figure which shows the slot allocation of D system (3 channel time division multiple access / frequency division multiplex system).

As shown in the figure, in the digital portable telephone device (not shown), since the same TDMA system as that of the above-mentioned digital cordless telephone device is applied, the mobile station from the base station side (downlink) is applied. The reception timing of the carrier (slot T _B-M1 → slot R _B-M1 ) given to the side (M1) and the carrier (slot T _M1-B → given from the mobile station (M1) to the base station (uplink)) Slot R _M1-B )
The transmission timing of is shifted in time.

Therefore, one semiconductor integrated circuit memory (not shown) for obtaining a recording / reproducing function is connected to the burst signal processing section (not shown) in this digital portable telephone device, and the digital cordless device described above is connected. The master unit of the telephone device performs the same process as the incoming call simultaneous recording process for the call from the slave unit to reproduce the user's response message from the semiconductor integrated circuit memory and the caller's voice to the semiconductor integrated circuit memory. Simultaneous processing with signal recording can be performed without providing a dedicated recording / reproducing circuit, just as in the case of the master unit of the digital cordless telephone device.

[0042]

According to the present invention, the burst signal processing section originally provided in the communication device performs the reproduction of the response message and the recording of the message of the caller at timings different from each other. It is possible to simultaneously record an incoming call response without separately providing a response message reproduction circuit and a caller message recording circuit. Further, this makes it possible to reduce the size and cost of the device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a hardware configuration of a digital cordless telephone device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an actual hardware configuration of a burst signal processing unit shown in FIG.

3 is a diagram showing a slot arrangement of a 4-channel TDMA / TDD system realized by the burst signal processing unit shown in FIG.

FIG. 4 is a block diagram showing a hardware configuration of a slave unit of the digital cordless telephone system according to the second embodiment of the present invention.

FIG. 5 is a diagram showing a slot arrangement of a 3-channel TDMA / FDD system applied to a digital mobile phone device.

[Explanation of symbols]

 1 line interface unit 2 line switching unit 6 system control unit 13 recording memory 20 wireless communication unit 22 voice codec unit 23 burst signal processing unit 31 first shift register 32 first P / S converter 39 second shift Register 40 Second P / S converter

Claims (1)

[Claims] 1. A transmission voice signal is compressed every predetermined time to generate a transmission burst signal, and a burst signal received at a timing different from the transmission timing of the transmission burst signal is time-expanded and received. In a communication device including a burst signal processing unit for restoring voice data, a first storage unit for storing a response message and a second storage unit for storing a message of a calling party are provided, and the first storage unit is provided. The response message stored in the means is reproduced by the decompression processing circuit unit for restoring the received voice data in the burst signal processing unit, and the caller's message is recorded in the second storage unit by the burst signal. A communication device with a recording function, which is performed by a compression processing circuit unit for compressing transmission voice data in a processing unit.