JPH08251260A - Digital cordless telephone system - Google Patents

Abstract

PURPOSE: To store and reproduce the communication contents of a slave unit at a low cost and to miniaturize a system by using A/D and D/A conversion circuits for communication in common to the storage and reproduction of the communication contents. CONSTITUTION: By the ON of a communication button 113, a control circuit 103 radio-connects a TDMA control circuit 106 and a radio circuit 102. Then, a communication state is attained by a dial button 104 and the voice of an opposite party is passed through the circuits 102, 106, a CODEC circuit 110, the D/A conversion circuit 109, converted into analog voice signals, outputted to a speaker 111 and recorded in a RAM 107. Further, the circuit 110 judges the presence/absence of the communication contents and a silence interval and the circuit 103 performs recording to the RAM 107 at the time of sound and the ON of a storage button 114 and performs the control of recording stoppage at the time of silence. Thus, the RAM 107 is effectively utilized. In such a manner, since the audible signals of the circuit 106 are recorded and the circuit 103 controls the recording and the reproduction, the circuits 108 and 109 are used in common to the recording and the reproduction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital cordless telephone device equipped with a base unit and a handset unit, and in particular, can realize a function of storing and reproducing call contents in the handset unit at a low cost and downsizing the unit. In addition, the present invention relates to a digital cordless telephone device in which only a voiced section of a call content is recorded to improve the use efficiency of a storage unit.

[0002]

2. Description of the Related Art As a conventional cordless telephone device, there is known a configuration in which a master IC or a slave device is provided with a dedicated IC circuit for storing and reproducing to store and reproduce a voice signal as a communication content. An example in which the master unit is equipped with a recording / playback IC and a voice memory is disclosed in Japanese Patent Laid-Open No. 5-10311.
There is one disclosed in No. 7.

FIG. 4 shows a block diagram of a slave unit in an analog cordless telephone device having a conventional storage and reproduction function. In the same figure, the slave unit of this conventional example includes an antenna 401, a radio circuit 402, and a control circuit (microcomputer) 40.
3, dial button 404, power battery 405, A / D,
D / A conversion circuit 406, recording / playback circuit (including A / D, D / A conversion circuit) and audio memory 407, analog AF
The circuit includes a circuit 408, a microphone 409, and a speaker 410, and the call button 4 is used as a control button.
11, a memory button 412 and a play button 413 are provided.

In any of the conventional analog cordless telephone devices as described above, in order to store the contents of the call during a call, the A / D for recording and reproducing is stored in either the slave unit or the master unit. It was necessary to provide a dedicated IC circuit including the conversion circuit and the D / A conversion circuit.

[0005]

Therefore, if the structure for realizing the storage and reproduction functions in the conventional analog cordless telephone device is directly applied to the digital cordless telephone device, either the master unit or the slave unit can be used. To
In order to realize the storage and reproduction functions, it is necessary to provide a dedicated IC circuit equipped with an A / D conversion circuit and a D / A conversion circuit. The A / D conversion circuit and the D / A conversion circuit are used for communication, and Since it is provided twice for storage and reproduction, there is a problem in that the circuit configuration cannot be effectively used and the miniaturization of the device is hindered.

[0006] Further, the call content to be stored includes a voiced section and a silent section, and the silent section is also recorded until the memory is stopped regardless of the voiced or silent state. There was a problem that it wasted in vain.

The present invention has been made in view of the above-mentioned problems of the prior art. The A / D conversion circuit and the D / A conversion circuit for a call are commonly used for storing and reproducing the contents of a call, and a child is used. It is possible to realize the function of storing and reproducing the contents of the call on the machine at low cost.
It is an object of the present invention to provide a digital cordless telephone device that can be downsized.

Another object of the present invention is to provide a digital cordless telephone device which can record only a voiced section of a call content and effectively use a storage means for storing the call content.

[0009]

In order to solve the above problems, a digital cordless telephone device according to claim 1 of the present invention comprises a master unit connected to a wired line and a slave unit connectable to a wireless line. In the digital cordless telephone device, the slave unit includes a communication control unit that controls communication between the slave unit and the master unit, an A / D conversion unit that converts an analog audible signal into a digital signal, and the communication control unit. D / for converting a digital audible signal output from the means into an analog signal
A conversion means, electrically rewritable storage means for storing the digital audible signal output from the communication control means, and each constituent element of the slave unit for storing and reproducing the call contents in the digital cordless telephone device. And control means for controlling.

According to a second aspect of the present invention, in the digital cordless telephone apparatus according to the first aspect, the slave unit communicates with the master unit by the TDMA communication method, and the communication control means is , A TDMA control circuit for controlling TDMA communication and a COD for encoding the output of the A / D conversion means and decoding the digital audible signal output by the TDMA control circuit or the storage means.
And an EC circuit.

According to a third aspect of the present invention, there is provided a digital cordless telephone device according to the first aspect, wherein the slave unit communicates with the master unit by a CDMA communication system, and the communication control means is , A CDMA control circuit for controlling CDMA communication and a COD for encoding the output of the A / D conversion means and decoding the digital audio signal output by the CDMA control circuit or the storage means.
And an EC circuit.

A digital cordless telephone device according to a fourth aspect is the digital cordless telephone device according to the first, second or third aspect, wherein the digital cordless telephone device is the power of the analog audio signal after the D / A conversion. The control means controls the storage of the digital audible signal in the storage means based on the detection result of the power detection means.

A digital cordless telephone device according to a fifth aspect is the digital cordless telephone device according to the first, second or third aspect, wherein the communication control means includes a power detection means for detecting the power of the digital audible signal. The control means controls the storage of the digital audible signal in the storage means based on the detection result of the power detection means.

Further, the digital cordless telephone device according to a sixth aspect is the digital cordless telephone device according to the second, third, fourth or fifth aspect, wherein the communication control means is provided from the TDMA control circuit or the CDMA control circuit to the C controller.
An opening / closing means for opening / closing a supply path of a digital audible signal to the ODEC circuit is provided, and the control means, during the reproduction,
The opening / closing means is controlled to an open state.

[0015]

In the digital cordless telephone device according to the first aspect of the present invention, in the slave unit connectable to the master unit connected to the wired line via the wireless line, the communication control unit for controlling the communication with the master unit is output. The digital audible signal
It should be stored in an electrically rewritable storage means,
In addition, the control means is configured to store and reproduce the contents of the call in the digital cordless telephone device, each component of the slave unit,
That is, communication control means, storage means, A / D conversion means, and D /
The A conversion means and the like are controlled. That is, the A / D conversion means and D / A conversion means for a call are shared for storage and reproduction of call contents, and the A / D conversion means and the D / A conversion means for a call and for storage and reproduction are used as in the conventional case. Without duplication of the A conversion means, the function of storing and reproducing the content of the call in the handset can be realized at low cost, and the device can be downsized.

In the digital cordless telephone device according to the second aspect of the invention, the cordless handset is a TDMA (Time Division Multip
le Access) Communication with the master unit is performed by the communication method, and the communication control means is the TDMA for controlling the TDMA communication.
The control circuit and the output of the A / D conversion means are encoded, and TDM
The A control circuit or a CODEC (Coder and Decoder) circuit for decoding the digital audible signal output from the storage means is provided. As a result, the digital cordless telephone device of the present invention can be installed in a PHS (Personal Handiphon
When applied to an e-system) or the like, it can be applied to a TDMA communication system, which is a standard specification of the product, and a TDD (Time Division Duplex) communication system in which time slots are evenly distributed for transmission and reception.

In the digital cordless telephone device according to the third aspect, the slave unit is a CDMA (Code Division Multip
le Access) Communication with the master unit is performed by the communication method, and the communication control means is the CDMA that controls the CDMA communication.
The control circuit and the output of the A / D conversion means are encoded, and the CDM
The A control circuit or the CODEC circuit for decoding the digital audible signal output from the storage means is provided. As a result, the digital cordless telephone device of the present invention is applied to the spread spectrum communication system (SS communication; Spread Spect).
rum), especially CDMA communication system.

Further, in the digital cordless telephone apparatus according to the fourth aspect, the power detecting means detects the power of the analog audible signal after the D / A conversion, and the control means determines the power based on the detection result of the power detecting means. The storage of the digital audio signal in the storage means is controlled. For example, when the power detection result is a certain value or less, the storage means is controlled not to store the digital audible signal, so that only the voiced section of the call content is recorded and the call content of the storage means is stored. It can be effectively used.

Further, in the digital cordless telephone apparatus according to the present invention, the power detecting means detects the power of the digital audible signal possessed by the communication control means, and the control means stores the power based on the detection result of the power detecting means. The storage of the digital audio signal in the means is controlled. For example, when the power detection result is a certain value or less, the storage means is controlled not to store the digital audible signal, so that only the voiced section of the call content is recorded and the call content of the storage means is stored. It can be effectively used.

Further, a commercially available CODEC circuit has a sound /
In many cases, a power detection function is provided in order to realize a VOX function for determining silence and generating background noise in order to eliminate a speaker's discomfort when there is no sound. Therefore, since the function of claim 5 can be realized by using the existing power detection function and transmitting the result of the power detection to the control means, the above effect can be obtained without adding a new component. You can

Further, in the digital cordless telephone device according to the sixth aspect, the opening / closing means is controlled by the control means.
At the time of reproduction, the supply path of the digital audible signal from the TDMA control circuit or the CDMA control circuit to the CODEC circuit is opened (disconnected). As a result, during reproduction, the received audible signal can be cut off, and the audible signal of high quality that does not include unnecessary audible signals can be reproduced without a feeling of strangeness.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the digital cordless telephone device of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of a slave unit in a digital cordless telephone device according to an embodiment of the present invention. The digital cordless telephone device of this embodiment has a configuration applicable to PHS and the like, and is a standard specification of the product, TD.
It is assumed that wireless communication is performed between the master unit and the slave unit by the MA communication method.

In the figure, the slave unit in the digital cordless telephone system of this embodiment is an antenna 101, a radio circuit 102, a control circuit (control means in the claims) 10
3, dial button 104, power battery 105, TDMA
Control circuit 106, RAM (Random Access Memory; storage means) 107, A / D conversion circuit (A / D conversion means) 10
8, D / A conversion circuit (D / A conversion means) 109, COD
An EC circuit 110, a speaker 111, a microphone 112, and a recording switch (opening / closing means) 116 are provided, and a call button 113 and a memory button 1 are used as control buttons.
14 and a play button 115. In the figure, 1
21-141 are signal lines.

The TDMA control circuit 106 controls the communication by the slave unit to the master unit by the TDMA communication system. In the case of the TDD communication system in which the time slots are evenly distributed to the transmission and reception, the TDMA control circuit 106 operates as a TDD control circuit. Become. RAM
Reference numeral 107 denotes an electrically rewritable storage unit that stores a digital audible signal output from the TDMA control circuit 106. The storage unit 107 is provided independently between the TDMA control circuit 106 and the RAM 107 or by a part of the RAM 107 due to design restrictions. It is also conceivable to have a configuration including a buffer consisting of

The A / D conversion circuit 108 converts an analog audible signal input from the microphone 112 into a digital signal and supplies the digital signal to the CODEC circuit 110. Further, the D / A conversion circuit 109 converts the digital audible signal output from the CODEC circuit 110 into an analog signal and outputs the speaker 111.
Supply to.

The CODEC circuit 110 encodes the digital signal from the A / D conversion circuit 108 and supplies it to the TDMA control circuit 106, and also receives the digital audio signal received from the TDMA control circuit 106 or the digital signal to be reproduced from the RAM 107. The audible signal is decoded and supplied to the D / A conversion circuit 109.

FIG. 2 shows a basic circuit configuration diagram of the CODEC circuit 110. In the figure, the CODEC circuit 11
0 is the compander 201, encoder 202, decoder 20
3, it is provided with an expander 204 and a power detector 205.

The power detector 205 detects the power of a signal obtained by decoding the digital audible signal of the TDMA control circuit 106 by the decoder 203 and indicates whether the communication content is a voiced section or a silent section. VOX output 213
Is supplied to the control circuit 103.

In the control circuit 103, the power detector 20
The storage of the digital audible signal in the RAM 107 is controlled on the basis of the VOX output 213 from the RAM 5. For example, V
When the OX output 213 indicates that the communication content is a silent section, the RAM 107 is controlled not to store the digital audible signal. As a result, only the voiced section of the call content can be recorded, and the RAM 107 for storing the call content can be effectively used.

The CODEC circuit 110 used in this embodiment
Is, for example, an existing 1-channel full-duplex ADP that mutually exchanges voice band analog signals and ADPCM data.
It can be configured by the technology used in the CODEC-LSI for CM. The LSI is provided with a power detection function in order to realize a VOX function for determining whether there is sound or no sound and generating background noise in order to eliminate discomfort of the speaker when there is no sound. Therefore, the function of storing only the voiced section of the call contents can be realized by utilizing such an existing power detection function and transmitting the result of the power detection to the control means. It is possible to effectively use the RAM 107 without adding a component.

At the time of reproduction, the recording switch 116 opens (disconnects) the supply path 112 of the digital audible signal from the TDMA control circuit 106 to the CODEC circuit 110 under the control of the control circuit 103. As a result, during reproduction, the received audible signal can be cut off, reproduction can be performed with a high-quality audible signal that does not include unnecessary audible signals, and the user can listen to the reproduced sound without discomfort.

The control circuit 103 is realized by a microcomputer,
In addition to the storage control of only the voiced section based on the VOX output 213 and the OFF control of the reception audible signal at the time of reproduction, the operation of each component of the slave unit in order to store and reproduce the call contents in the digital cordless telephone device. Is controlled by each control signal.

In the digital cordless telephone device of this embodiment, the power detector 205 in the CODEC circuit 110 is used.
Thus, the power of the signal obtained by decoding the digital audible signal is detected. However, the present invention is not limited to this, and if the CODEC circuit 110 does not have a VOX function, the power detector 205 is separately added. Good.

On the output side of the D / A conversion circuit 109,
A power detection means for detecting the power of the analog audible signal after D / A conversion is configured, and the control circuit 103 controls the storage of the digital audible signal in the RAM 107 based on the detection result of the power detection means. Good.
For example, if the power detection result is below a certain value,
By controlling the RAM 107 not to store a digital audible signal, only the voiced section of the call content is recorded,
It is possible to effectively use the RAM 107 that stores the content of the call.

Furthermore, in order to make the digital cordless telephone device of this embodiment compatible with the spread spectrum communication system, especially the CDMA communication system, in the configuration of FIG.
It is realized by replacing the control circuit 106 with a CDMA control circuit that controls CDMA communication.

Next, the processing operation of the telephone, recording and reproducing functions of the slave in the digital cordless telephone system of this embodiment will be described in detail with reference to the flow chart shown in FIG.

First, the call processing will be described. In the standby state of step S301, the call button 113
When is turned on, steps S302 to S3
03, the control circuit 103 determines that the TDMA control circuit 1
06 and the wireless circuit 102 are controlled to establish a wireless connection.

Next, in step S304, the call is started by the dial processing by the dial button 104.
When the call state is entered, the voice signal of the other party is supplied to the wireless circuit 102 as a reception signal, and is further supplied to the TDMA control circuit 106 via the wireless circuit 102. The digital audio signal of the TDMA control circuit 106 is converted into an analog audio signal via the CODEC circuit 110 and the D / A conversion circuit 109, output from the speaker 111, and recorded (stored) in the RAM 107.

Next, the recording process during a call will be described. At the time of a call, the power detector 205 in the CODEC circuit 110 detects the power of a signal obtained by decoding a digital audible signal, and always determines whether the communication content is a voiced section or a silent section. The VOX output 213, which is the determination result, is supplied to the control circuit 103. Here, in the voice determination, the output value of the expander 204 in the CODEC circuit 110 is, for example, −30.
When it is [dBm0] or more, it is considered to be voiced.

That is, if it is determined in the voiced determination in step S305 that the voiced section is present and the storage button 114 is ON at this time, the process proceeds to step S306, and the control circuit 103 stores the call content in the RAM 107. Control to record (remember). Further, when it is determined in the silence determination in step S307 that there is a silent section, the process proceeds to step S308, the control circuit 103 determines to stop recording (storing) the call content in the RAM 107, and the call content in the RAM 107. Control not to record on.

In step S309, the record button 1
When 14 is turned off, the control circuit 103 outputs a recording stop request to the TDMA control circuit 106 and the RAM 107 so as not to record the call content in the RAM 107. If the record button 114 remains ON,
Returning to step S305, the above processing is repeated. That is, only the voiced section is recorded until the record button 114 is turned off.

Further, the above steps S305 to S30
The processes up to 9 are repeated until the call button 113 is turned off in step S310. As a result, it is possible to effectively use the RAM 107 that stores the call content by recording only the voiced section without recording the silent section of the call content. When the call button 113 is turned off in step S310, the wireless connection is released in step S311, and the standby state of step S301 is restored.

Next, the reproducing process will be described. In the standby state of step S302, the call button 113
If is OFF, it is possible to start the reproduction process, and the process proceeds to step S320, and the control circuit 103
Determines whether or not the reproduction button 115 has been turned on and a reproduction start request has been issued by a user operation. If there is no reproduction start request, the process returns to the standby state of step S301, and if there is a reproduction start request, the reproduction process from step S321 is started.

In step S321, the recording switch 116 is opened by the control circuit 103. As a result, even if a call is started after the reproduction process is started, the call is stopped or put on hold, and the user can listen to the reproduced voice without a feeling of strangeness.

Next, when the reproduction process is started in step S322, a reproduction stop request is made in step S323, that is, the reproduction button 115 is turned on by the user's operation.
The reproduction process continues until FF is set. Step S
When a reproduction stop request is made in step S323, step S324.
In step S325, the control circuit 103 stops reading the call content from the RAM 107,
The recording switch 116 is closed, and step S3 is performed again.
Return to the standby state of 01.

As described above, in the digital cordless telephone device of this embodiment, the TDMA control circuit (or CDMA) is used.
The digital audible signal of the control circuit) 106 is stored in the RAM 1
07, and the control circuit 103 controls each component of the slave unit to store and reproduce the call contents in the digital cordless telephone device, and the A / D conversion circuit and the D / A conversion circuit for the call are The call contents are shared for storage and reproduction, and since the A / D conversion circuit and the D / A conversion circuit for communication and storage and reproduction do not overlap as in the conventional case, the communication contents in the slave unit The storage and playback functions can be realized at low cost, and the device can be downsized.

[0048]

As described above, claim 1 of the present invention
According to the digital cordless telephone device of the invention, in the slave unit connectable to the master unit connected to the wired line via the wireless line, the digital audible signal output from the communication control unit that controls the communication with the master unit, It is stored in an electrically rewritable storage means, and the control means stores each component of the slave unit, that is, communication control means, storage means, A / Since the D conversion means and the D / A conversion means are controlled and the A / D conversion means and the D / A conversion means for a call are shared for storing and reproducing the call contents, the storage of the call contents in the slave unit is performed. And the playback function can be realized at low cost,
It is possible to provide a digital cordless telephone device that can be downsized.

According to the second aspect of the digital cordless telephone apparatus, the slave unit communicates with the master unit by the TDMA communication system, the communication control means is a TDMA control circuit for controlling the TDMA communication, Since the output of the A / D conversion means is encoded and the CODEC circuit for decoding the digital audible signal output from the TDMA control circuit or the storage means is provided, it is applicable to PHS and the like, and TDM
It is possible to provide a digital cordless telephone device compatible with the A communication system and the TDD communication system.

According to the third aspect of the digital cordless telephone apparatus, the slave unit communicates with the master unit by the CDMA communication system, the communication control means is the CDMA control circuit for controlling the CDMA communication, Since the output of the A / D conversion means is encoded and the CODEC circuit which decodes the digital audible signal output from the CDMA control circuit or the storage means is provided, a digital cordless telephone device compatible with the CDMA communication system is provided. Can be provided.

According to the digital cordless telephone device of the present invention, the power of the analog audible signal after D / A conversion is detected by the power detection means, and the control means is based on the detection result of the power detection means. Control the storage of the digital audible signal in the storage means. For example, when the power detection result is below a certain value, the storage means controls not to store the digital audible signal. It is possible to provide a digital cordless telephone device capable of effectively utilizing the storage means for recording only the voiced section and storing the call contents.

According to the fifth aspect of the digital cordless telephone apparatus, the power detecting means detects the power of the digital audible signal possessed by the communication control means, and based on the detection result of the power detecting means, the control means. Control the storage of the digital audible signal in the storage means. For example, when the power detection result is below a certain value, the storage means controls not to store the digital audible signal. It is possible to record only the voiced section and effectively use the storage means for storing the contents of the call.
In addition, since many commercially available CODEC circuits have a power detection function in order to realize the VOX function, the above effect can be achieved by using the existing power detection function without adding a new component. Can be obtained.

Further, according to the digital cordless telephone apparatus of the sixth aspect, the opening / closing means controls the supply path of the digital audible signal from the TDMA control circuit or the CDMA control circuit to the CODEC circuit during reproduction under the control of the control means. Since it was decided to put it in the open (off) state, during playback,
The received audible signal can be cut off, and can be reproduced without any discomfort by a good quality audible signal that does not include unnecessary audible signals.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a child device in a digital cordless telephone device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a CODEC circuit in the example.

FIG. 3 is a flowchart illustrating a processing operation of a call, recording and reproduction function according to an embodiment.

FIG. 4 is a configuration diagram of a slave unit in an analog cordless telephone device having a conventional storage and reproduction function.

[Explanation of symbols]

 101 Antenna 102 Radio Circuit 103 Control Circuit (Microcomputer) (Control Means) 104 Dial Button 105 Power Battery 106 TDMA Control Circuit (CDMA Control Circuit) 107 RAM (Memory Means) 108 A / D Conversion Circuit (A / D Conversion Means) 109 D / A conversion circuit (D / A conversion means) 110 CODEC circuit 111 speaker 112 microphone 113 call button 114 storage button 115 playback button 116 recording switch 201 compander 202 encoder 203 decoder 204 expander 205 power detector (VOX circuit) )

Claims (6)

[Claims] 1. In a digital cordless telephone device having a master unit connected to a wired line and a slave unit connectable to a wireless line, the slave unit controls communication between the slave unit and the master unit. Communication control means, A / D conversion means for converting an analog audio signal into a digital signal, D / A conversion means for converting a digital audio signal output from the communication control means into an analog signal, and from the communication control means An electrically rewritable storage means for storing the output digital audible signal, and a control means for controlling each component of the slave unit to store and reproduce the call contents in the digital cordless telephone device. Characteristic digital cordless telephone device. 2. The slave unit communicates with the master unit by a TDMA communication method, and the communication control unit is TDMA.
CO for controlling the TDMA control circuit for controlling communication and the output of the A / D conversion means and for decoding the digital audible signal output by the TDMA control circuit or the storage means
The digital cordless telephone device according to claim 1, further comprising a DEC circuit. 3. The slave unit communicates with the master unit according to a CDMA communication method, and the communication control unit is a CDMA unit.
A CDMA control circuit that controls communication and a CO that encodes the output of the A / D conversion means and decodes the digital audio signal output by the CDMA control circuit or the storage means.
The digital cordless telephone device according to claim 1, further comprising a DEC circuit. 4. The digital cordless telephone device has power detection means for detecting the power of the analog audible signal after the D / A conversion, and the control means, based on the detection result of the power detection means, 4. The digital cordless telephone device according to claim 1, wherein storage of the digital audio signal in the storage means is controlled. 5. The communication control means has a power detection means for detecting the power of the digital audio signal, and the control means, based on the detection result of the power detection means, the digital audio signal in the storage means. 4. The digital cordless telephone device according to claim 1, wherein the storage of the digital cordless telephone device is controlled. 6. The communication control means has an opening / closing means for opening / closing a supply path of a digital audible signal from the TDMA control circuit or the CDMA control circuit to the CODEC circuit, and the control means, during the reproduction, 6. The digital cordless telephone device according to claim 2, 3, 4, or 5, wherein the opening / closing means is controlled to an open state.