JPH10271061A - Digital radio telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital radio telephone set in which a conversion content during a speech is recorded/reproduced in 2-way without increasing a circuit scale. SOLUTION: A telephone set is provided with a mixing circuit 13 that mixes transmitter side digital data with receiver side digital data, a memory 15 that records digital voice signal data, an interface circuit 14 that writes the digital data to the memory 15, and a control section 12 that controls write to the memory 15 and controls read from the memory, and records/reproduces the 2way conversion content during a speech.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital wireless telephone having a voice recording / reproducing function.

[0002]

2. Description of the Related Art Digital radio telephones have good portability.
The advantage is that you can respond on the spot. However, when receiving an incoming call outdoors, for example, when walking, the user may need to speak where writing instruments cannot be used. By providing the digital wireless telephone with a function of recording and reproducing communication contents, usability can be improved. In addition, we answer automatically like home answering machine,
By having the function of recording the other party's messages, usability can be improved.

As one of means for realizing this, there is a method using a recording / reproducing IC having an analog interface. During recording, the receiver output signal (analog signal) is D / A converted and recorded in a memory. Further, at the time of reproduction, the digital data recorded in the memory is converted back to analog by A / D conversion and inserted into an audio circuit. Further, as another means, there is a method of directly transferring digital data of audio input / output to a memory as disclosed in Japanese Patent Application Laid-Open No. H6-152800.

[0004]

However, in the conventional system using the recording / reproducing IC, since the analog signal is converted into a digital signal by the recording / reproducing IC, it is susceptible to noise and the signal level is adjusted appropriately. In this case, an amplifier circuit or the like is required to adjust the circuit size, and the circuit scale becomes large and the mounting area becomes large.

When digital data is directly recorded by the method disclosed in JP-A-6-152800, since the input and output digital data are separated, the contents of a two-way conversation during a call are recorded. I couldn't do that. For this reason, when recording during a telephone call, only the reception was recorded.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital radio telephone capable of recording and reproducing conversation contents during a conversation in both directions without increasing the circuit scale.

[0007]

According to a first aspect of the present invention, there is provided a digital wireless telephone including a conversion circuit for converting an audio signal into a digital signal, and transmitting and receiving the digital signal through a wireless line. A mixing circuit that mixes the transmission-side digital data and the reception-side digital data, a memory that records the digital data of the audio signal, an interface circuit that writes the digital data to the memory, and a write to the memory. And a control unit for controlling reading from the memory, so that the contents of a two-way conversation during a call can be recorded and reproduced.

In the digital wireless telephone according to the second invention, a response message is automatically transmitted in response to an incoming call.
It has an automatic response recording function for recording voice from the other party.

In a digital wireless telephone according to a third aspect of the present invention, a data compression / expansion circuit is provided for compressing digital data to be written in a memory and expanding compressed digital data read from the memory.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is an overall block diagram of a digital wireless telephone according to Embodiment 1 of the present invention. In FIG. 1, 1 is an antenna, 2 is a radio unit, and an antenna 1
And a function of modulating the transmission data from the TDMA unit 3 and sending it to the antenna 1. Reference numeral 3 denotes a TDMA unit which controls time division of transmission / reception data. Reference numeral 4 denotes an ADPCM decoder, which has a function of returning ADPCM data to PCM data. Reference numeral 5 denotes a signal switching circuit on the receiving side, which receives a signal from the ADPCM decoder 4, a mixing circuit 13, and a memory interface 1.
4. Switching between signals from a recording / reproducing unit comprising the memory 15. 6 is a D / A for returning PCM data to an analog signal.
It is a conversion circuit.

Reference numeral 7 denotes a receiver, which outputs an analog signal as audio. 8 is a microphone. Reference numeral 9 denotes an A / D conversion circuit for converting an analog signal from a microphone into digital data. Reference numeral 10 denotes a signal switching circuit on the transmission side.
The signal from the / A conversion circuit 9 and the signal from the memory interface are selected and sent to the ADPCM encoder 11.
Reference numeral 11 denotes an ADPCM encoder that converts PCM data into A
Convert to DPCM. Reference numeral 12 denotes a control unit which is constituted by a one-chip microcomputer or the like and controls a terminal constituted by a digital wireless telephone.

A mixing circuit 13 mixes the transmitted voice data and the received voice data according to an instruction from the control unit 12 and sends the data to the memory interface circuit 14. 1
Reference numeral 4 denotes a memory interface circuit which continuously writes data from the mixing circuit 13 into the memory 15 in response to a recording instruction from the control unit 12. In addition, in response to a reproduction instruction from the control unit 12, data is continuously read from the memory 15 and sent to the signal switching circuits 5 and 10 as audio data. Reference numeral 15 denotes a memory for storing audio data.

The operation will be described with reference to FIG. First, the operation during a normal call will be described. The transmission signal is input from the microphone 8, is sampled by the A / D conversion circuit 9, is quantized, and is converted into an ADPCM digital signal. The digitized data is converted (compressed) into ADPCM data by an ADPCM encoder 11 through a signal switching circuit 10 on the transmission side, sent to the TDMA unit 3, sent to the radio unit 2 in a time division manner, and transmitted from the antenna 1. Sent.

The received radio wave received from the antenna 1 is sent to the ADPCM decoder 4 through the radio unit 2 and the TDMA unit 3, where it is converted (decompressed) into PCM data.
Is done. Then, D / is passed through the signal switching circuit 5 on the receiving side.
The signal is sent to the A conversion circuit 6, converted back to an analog signal, and output from the receiver 7.

Next, the operation for recording a call will be described. When a recording start instruction is received from the control unit 12, the mixing circuit 11 to which the transmission audio data and the reception audio data have been input mixes both data and outputs the data to the memory interface circuit 14. Until you are told to stop recording,
This data is continuously stored in the memory 15 by the memory interface circuit 14.

Next, a reproducing operation during a call will be described. When an instruction to start reproduction is received from the control unit 12, the memory interface circuit 14 reads data stored in the memory 15 and continuously reads the data until the data is completed or a stop instruction is issued. Output. Further, the signal switching circuits 5 and 10 on the receiving side and the transmitting side select data from the memory interface circuit 14 according to an instruction from the control unit 12. This allows sending,
The data from the memory 15 is output during the reception.

Next, a description will be given of a reproducing operation in a standby state after the end of a call. When an instruction to start reproduction is received from the control unit 12, the memory interface circuit 14 reads data stored in the memory 15 and continuously reads data until the data ends or a stop instruction is issued. Output as Also, according to an instruction from the control unit 12,
Each of the signal switching circuits 5 on the reception side and the transmission side selects a signal from the memory interface circuit 14. The signal is converted back to an analog signal by the D / A conversion circuit 6 and output from the receiver 7.

As described above, according to the configuration of the first embodiment, the digital data for recording and reproduction
A / D-D / A conversion, which has been conventionally performed using a recording / reproducing IC, can be eliminated by using the data used in (1), and recording / reproducing is not easily affected by noise without increasing the circuit scale. Function can be realized.

Also, when an incoming call is received outdoors, for example, when walking, the memo can be taken even when the user has to speak in a place where writing instruments cannot be used. Furthermore, since the contents of the transmission and reception can be recorded as compared with the recording of only the reception, the conversation exchange can be more naturally recorded.

By using the configuration of FIG. 1 and combining it with an automatic incoming call, a response message is automatically sent in response to the incoming call, and an automatic answer recording operation of recording the voice of the other party can be performed. .

Next, the operation of the automatic response recording will be described. When an incoming call is received while the automatic answering recording mode is set, the terminal composed of the digital wireless telephone automatically performs a connection operation after counting a predetermined number of ringing tones. Thereafter, response message data prepared in advance in the memory 15 is sent to the transmission system. The voice reproduction method at the time of answering is the same as the reproduction during a call. After the end of the reproduction, the voice data is stored in the memory 15 in the same manner as during recording during a call.
However, in this case, the sound on the transmitting side is muted by the mixing circuit 13, and only the sound from the other party is recorded. Then, when the recording from the other party is completed and the connection is completed, the recording is stopped.

Next, the operation for recording a response message used for an automatic response will be described. When an instruction to start recording a response message is issued from the control unit 12, the mixing circuit 13 mutes the receiving side and outputs only the voice of the transmitting side to the memory interface circuit 14. This data is continuously stored in the memory 15 by the memory interface circuit 14 until an instruction to stop recording is given.

As described above, when performing automatic answer recording,
Even when you cannot use writing utensils, such as when you are outdoors or walking, you can automatically respond and record your partner's business, so you can make notes.

Embodiment 2 FIG. FIG. 2 is an overall block diagram showing a second embodiment of the present invention.
A data compression / decompression circuit 16 is added. In FIG. 2, 1 is an antenna, 2 is a radio unit, and antenna 1
And a function of modulating the transmission data from the TDMA unit 3 and sending it to the antenna 1. Reference numeral 3 denotes a TDMA unit which controls time division of transmission / reception data. Reference numeral 4 denotes an ADPCM decoder, which has a function of returning ADPCM data to PCM data. Reference numeral 5 denotes a signal switching circuit on the receiving side, which receives a signal from the ADPCM decoder 4, a mixing circuit 13, and a memory interface 1.
4. Switching between signals from a recording / reproducing unit comprising the memory 15. 6 is a D / A for returning PCM data to an analog signal.
It is a conversion circuit.

Reference numeral 7 denotes a receiver, which outputs an analog signal as audio. 8 is a microphone. Reference numeral 9 denotes an A / D conversion circuit for converting an analog signal from a microphone into digital data. Reference numeral 10 denotes a signal switching circuit on the transmission side.
The signal from the / A conversion circuit 9 and the signal from the memory interface are selected and sent to the ADPCM encoder 11.
Reference numeral 11 denotes an ADPCM encoder that converts PCM data into A
Convert to DPCM. Reference numeral 12 denotes a control unit which is constituted by a one-chip microcomputer or the like and controls a terminal constituted by a digital wireless telephone.

A mixing circuit 13 mixes the transmitted voice data and the received voice data according to an instruction from the control unit 12, and sends the data to the memory interface circuit 14. 1
Reference numeral 4 denotes a memory interface circuit which continuously writes data from the mixing circuit 13 into the memory 15 in response to a recording instruction from the control unit 12. In addition, in response to a reproduction instruction from the control unit 12, data is continuously read from the memory 15 and sent to the signal switching circuits 5 and 10 as audio data. Reference numeral 15 denotes a memory for storing audio data, and reference numeral 16 denotes a data compression / decompression circuit.

At the time of recording, the audio data is compressed by the data compression / decompression circuit 16 and then sent to the memory interface circuit 14. In addition, it has a function of returning compressed data to the original state during reproduction.

As described above, according to the configuration of the second embodiment, the use efficiency of the memory 15 is increased by the data compression / decompression circuit 16, so that long-time recording and reproduction can be performed with a smaller memory.

[0029]

According to the first aspect of the present invention, by using data used in the radio section as digital data for recording / reproducing, A / D-recording which has conventionally been performed using a recording / reproducing IC.
D / A conversion can be eliminated, and a recording / reproducing function that is not easily affected by noise can be realized without increasing the circuit scale. Further, since the contents of transmission and reception can be recorded as compared with the recording of only the reception, the usability is further improved such that the conversation exchange can be more naturally recorded.

According to the second aspect of the present invention, when an incoming call is received outdoors, for example, when walking, or when the user must speak in a place where writing implements cannot be used, the system automatically responds and records the other party's requirements. Therefore, usability is further improved.

According to the third aspect of the present invention, since the data compression / expansion circuit is provided, the use efficiency of the memory is increased, and a long time recording / reproduction can be performed with a smaller memory.

[Brief description of the drawings]

FIG. 1 is an overall block diagram showing Embodiment 1 of a digital wireless telephone according to the present invention.

FIG. 2 is an overall block diagram showing Embodiment 2 of a digital wireless telephone according to the present invention.

[Explanation of symbols]

1 antenna, 2 radio section, 3 TDMA section, 4 AD
PCM decoder, 5 receiving side signal switching circuit, 6 D / A
Conversion circuit, 7 receiver, 8 microphone, 9 A / D conversion circuit, 10 ADPCM encoder, 11 signal switching circuit on transmission side, 12 control unit, 13 mixing unit, 14
Memory interface, 15 memories, 16 data compression / decompression circuits.

Claims (3)

[Claims] 1. A digital wireless telephone comprising a conversion circuit for converting an audio signal into a digital signal, wherein the digital signal is transmitted / received through a wireless line. The digital wireless telephone mixes transmission digital data with reception digital data. A mixing circuit, a memory for recording digital data of an audio signal, an interface circuit for writing digital data to the memory, and a control unit for controlling writing to the memory and controlling reading from the memory. A digital radio telephone comprising: a recording device for recording and reproducing bidirectional conversation contents during a call; 2. The digital wireless telephone according to claim 1, further comprising an automatic response recording function of automatically transmitting a response message in response to an incoming call and recording a voice from the other party. 3. The digital radio according to claim 1, further comprising a data compression / expansion circuit for compressing the digital data written in the memory and expanding the compressed digital data read from the memory. Phone.