JPH06152800A - Digital wireless phone - Google Patents

Abstract

PURPOSE:To record the content of a call in a memo by providing a memory which stores the digital voice signals and a control circuit which controls the writing/reading jobs of the memory. CONSTITUTION:When a switch 22 is set in a sound recording mode in a calling state, the voice data on the opposite party are written in a RAM 21 through a line of a TDME/TDD control circui 4 1 FIFO 15 a bus 19. When the switch 22 is set in a sound recording mode in a non-calling state, the voice signal of a user is supplied to a voice CODEC circuit 3 through a telephone transmitter 1 and turned into the voice data. This voice data is written in the RAM 21 through a line of the circuit 3 a FIFO 14 the bus 19. When the switch 22 is set in a reproduction mode in both calling and non-calling states, the voice data are read out of the RAM 21 and supplied to a telephone receiver 2 via a line of the bus 19 the FIFO 14 the circuit 3.

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.

[0002]

2. Description of the Related Art Recently, mobile phones have been used for business and the like. This mobile phone is connected to the nearest base station through a UHF band wireless line, but can be used in a relatively wide range by switching the base station.

[0003]

By the way, when using a mobile phone while out of the office, when making a call from the mobile phone, it is possible to select an appropriate place in advance and make the call from there. However, when receiving an incoming call, the place where the incoming call is received is uncertain, and the incoming call may be received on the road, for example. Then, when taking a note of the contents of the call, it is necessary to take a note in a notebook or the like with a pen while holding the mobile phone, and an unnatural posture is forced, so that the note may not be properly taken. Moreover, even if the user is in a place where he can make notes, there are many mistakes when making notes using writing instruments.

Of course, if a small tape recorder is prepared, the contents of the call can be accurately recorded. However, in this case, by using the tape recorder together, the portability is impaired and the operation becomes difficult. It becomes complicated and not practical. The present invention is intended to solve the above problems.

[0005]

Therefore, in the present invention, when the reference numerals of the respective parts correspond to the embodiments described later, the audio signal is converted into a digital audio signal of a predetermined format, and the digital audio signal is converted into a digital audio signal. In a digital wireless telephone that transmits and receives via a wireless line, a memory 21 for storing a digital voice signal and this memory 2
Circuits 11 and 12 for controlling writing and reading of 1
And 22 are provided.

[0006]

Function: The voice data of the other party who is talking is written in the memory 21. The voice data written in the memory 21 is read out later and reproduced from the handset 2.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a digital portable telephone (digital cordless telephone) as a whole. And when making a call,
The analog voice signal from the transmitter 1 is supplied to the voice codec circuit 3, A / D converted and data compressed. As a result, for example, 32 kbps (sampling frequency is 8 kHz
Then, one sample is converted into ADPCM audio data of 4 bits, and this audio data is supplied to the TDMA / TDD control circuit 4.

Then, in the control circuit 4, the audio data supplied thereto is assigned to the information channel portion of a predetermined slot timing together with the data from the system control circuit 10 which will be described later to generate transmission data, and this transmission data is transmitted. The data is supplied to the modulation / demodulation circuit 5 and converted into a baseband signal, and this signal is supplied to the transmission / reception circuit 6 and converted into a transmission signal of a target line channel,
This signal is transmitted from the transmitting / receiving antenna 7 to the base station.

Further, a signal from the base station is received by the antenna 7, the received signal is supplied to the modulation / demodulation circuit 5 through the transmission / reception circuit 6, the received data is taken out, and the received data is supplied to the control circuit 4 for voice. At the same time as being converted into data, the data from the base station is taken out, the voice data is supplied to the codec circuit 3, the data is expanded and D / A converted to the original voice signal, and this voice signal is received by the receiver. 2 is supplied.

Reference numeral 20 denotes a system control circuit composed of a microcomputer, which controls and monitors the above-mentioned circuits 3 to 6 and controls a man-machine interface including a key input section 8 and a display section 9. In addition to the above, communication control such as processing of data to be accessed with the base station, connection and disconnection of a line, and the like is performed.

Therefore, the system control circuit 10 is
U11, ROM1 in which various programs are written
2. A RAM 13 for a work area is provided, and these memories 12 to 13 are C through a system bus 19.
It is connected to the PU 11. Further, the control circuit 10
FIFO (FIFO memory) 14, 15 and port 16
Each of the circuits 3 to 6 is connected to the bus 19 through these circuits 14 to 16.

In this case, the FIFOs 14 and 15 are connected to the codec circuit 3 and the control circuit 4, and the CPU 11 and
When data is accessed between the codec circuit 3 and the control circuit 4, the access speed is converted.

The configuration and operation up to this point are similar to those of the digital portable telephones up to now, but the present invention is further configured as follows.

That is, R for storing voice data
An AM 21 is provided and this RAM 21 is connected to the bus 19. Further, a mode switch 22 for controlling writing and reading of audio data to and from the RAM 21, that is, recording and reproduction is provided, and this switch 22 is connected to the bus 19 through an input port 23. RA
The capacity of M21 is, for example, 1 Mbit.

The CPU 11 controls each circuit according to the program of the ROM 12 so that the following operation can be performed in accordance with a combination of a call / non-call (offline) and a stop mode / recording mode / playback mode of the switch 22. The operation is performed as follows.

When the switch 22 is set to the stop mode during a call / non-call In the case of a call, a call is performed between the user (own station) and the other party as described above. Also, nothing is done during a non-call. That is, when the switch 22 is in the stop mode, the operation is similar to that of a normal digital mobile phone.

When the switch 22 is set to the recording mode during a call In this case, the voice data of the other party (ADPCM data)
However, the TDMA / TD control circuit 4 → FIFO 15 → bus 1
It is written in the RAM 21 through the line 9. Therefore, in this case, the voice of the other party is recorded in the RAM 21.

That is, if the switch 22 is set to the recording mode during a call, the voice of the other party during the call is changed to R.
Can be recorded on AM21. In this case, R
Since the capacity of the AM 21 is 1 Mbit and the audio data written in the AM 21 is 32 kbps, a maximum of 32 seconds (= 1 Mbit / 32 kbps) of audio can be recorded in the RAM 21.

When the switch 22 is set to the recording mode during non-calling In this case, the voice signal of the user is supplied to the voice codec circuit 3 through the transmitter 1 and the voice data (ADP
(CM data), this audio data is written in the RAM 21 through the line of the codec circuit 3 → FIFO 14 → bus 19. Therefore, in this case, the voice of the user can be recorded in the RAM 21. In this case as well, as in the case of, it is possible to record a maximum of 32 seconds of voice.

When the switch 22 is set to the reproduction mode during a call In this case, the voice data in the RAM 21 is changed to the RAM 21.
Read out from the bus and supplied to the handset 2 through the line of bus 19 → FIFO 14 → codec circuit 3. Also,
The voice signal from the other party is muted in the codec circuit 3. Therefore, in this case, the RAM
The user can listen to the voice recorded in 21.

Further, in this case, the audio data read from the RAM 21 is transferred to the bus 19 → FIFO 15 → TDM.
It is supplied to the modulation / demodulation circuit 5 through the A / TDD control circuit 4,
You can also send it to the other party.

When the switch 22 is set to the reproduction mode during a non-call, in this case, the audio data in the RAM 21 is changed to the RAM 21.
Read out from the bus and supplied to the handset 2 through the line of bus 19 → FIFO 14 → codec circuit 3. Therefore, in this case, the user can listen to the voice recorded in the RAM 21. That is, for example, it is possible to listen to the call contents of the other party recorded in the RAM 21 during the call.

[0023]

As described above, according to the present invention, it is possible to record the voice of the other party during a call in a digital radio telephone and reproduce it for later listening.
Moreover, since the voice codec circuit 3 used for the original call is used when recording and reproducing the voice signal to and from the RAM 21, it is only necessary to provide the RAM 21 and the mode switch 22 and a special circuit. Also, no major circuit changes are required.

Further, since the voice data is recorded in the RAM 21 in the state of ADPCM data, that is, the data is compressed, the voice signal can be recorded / reproduced with high quality for a long time. Furthermore, since the call of the other party can be recorded by simply switching the switch 22, the operation is easy, and the memo can be recorded anytime and anywhere, and the reproduction thereof is similarly easy. is there.

[Brief description of drawings]

FIG. 1 is a system diagram showing an example of the present invention.

[Explanation of symbols]

 1 transmitter 2 receiver 3 voice codec circuit 4 TDMA / TDD control circuit 5 modulation / demodulation circuit 6 transmission / reception circuit 7 transmission / reception antenna 8 key input unit 9 display unit 10 system control circuit 11 CPU 12 ROM 14, 15 FIFO 21 voice storage RAM 22 Mode switch

Claims (4)

[Claims] 1. A digital radiotelephone in which a voice signal is converted into a digital voice signal of a predetermined format and the digital voice signal is transmitted and received through a wireless line. A memory for storing the digital voice signal, and a memory for storing the digital voice signal. A digital wireless telephone provided with a circuit for controlling writing and reading of data. 2. A digital wireless telephone in which a voice signal is data-compressed into a digital voice signal of a predetermined format and the digital voice signal is transmitted and received through a wireless line, and a memory for storing the digital voice signal, A digital wireless telephone provided with a circuit for controlling writing and reading of memory. 3. A first processing circuit for data-compressing a voice signal from a transmitter into a digital voice signal of a predetermined format, and transmitting the digital voice signal from the first processing circuit to a base station through a wireless line. A transmitting circuit for receiving a digital voice signal transmitted from the base station; a data receiving circuit for decompressing the digital voice signal received by the receiving circuit; Two
And a switch for controlling writing and reading of the memory, and when the switch is set to the recording mode,
The digital audio signal from the processing circuit of or the other party's digital audio signal before decompressing the data is written to the memory, and when the switch is set to the reproduction mode, the digital audio signal written to the memory is A digital radio telephone adapted to be supplied to the second processing circuit to be converted into an original voice signal and to supply the voice signal to the handset. 4. A first processing circuit for data-compressing a voice signal from a transmitter into a digital voice signal of a predetermined format, and transmitting the digital voice signal from the first processing circuit to a base station through a wireless line. And a receiving circuit for receiving the digital voice signal transmitted from the base station, and data-decompressing the digital voice signal received by the receiving circuit to supply the voice signal of the other party of the call to the handset. Two
And a switch for controlling writing and reading of the memory, and when the switch is set to the recording mode,
The digital audio signal from the processing circuit of, or the digital audio signal of the other party before the data expansion is written to the memory, and when the switch is set to the reproduction mode, the digital audio signal written to the memory is read, A digital radio telephone adapted to transmit the read digital voice signal to the base station.