JPH08251069A - Digital wireless telephone - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the power consumption of a digital wireless telephone and to enable long-time recording with a device having a memo recording function. [Configuration] The configuration is such that the encoding unit is operated only when voice is actually present in the transmission signal. In addition, the transmission signal stores / updates the data encoded by the encoding unit in the memory,
The reception signal constitutes a memo recording function by means of storing / updating the encoded data in the memory before being decoded by the decoding section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice coding process and a voice recording function of a digital wireless telephone.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing an example of the configuration of a conventional digital radio telephone of this type, in which 1 is an antenna, 2 is a radio section, 3 is a baseband section,
4 is a voice CODEC section, 5 is an A / D conversion section, and 6 is a D / A section.
A conversion unit, 7 is a microphone, 8 is a speaker, and voice COD
The EC unit 4 is composed of a voice encoding unit 41 and a voice decoding unit 42.

Although the operation of the apparatus shown in FIG. 4 is well known, the voice input from the microphone 7 at the time of transmission is digitally processed by the A / D converter 5, and the voice encoder 41 converts the data amount into several minutes. The encoded data is compressed to about 1 and converted into a radio transmission signal by the baseband unit 3, the frequency thereof is up-converted by the radio unit 2 and transmitted from the antenna 1. In addition, at the time of reception, the radio signal received by the antenna 1 is down-converted by the radio unit 2, and the base band unit 3
Is converted into digital data by the voice decoding unit 42, converted into an analog voice signal by the D / A conversion unit 6, and output as voice from the speaker 8.

The conventional digital radio telephone is configured as described above, and the voice encoding unit 41, which has a large amount of data processing and consumes a large amount of power, is always operating during a call, which is wasteful in terms of power consumption. Particularly in a mobile phone, there is a problem that the size of the battery that can be mounted is limited, and the time during which a call can be made without replacing the battery is short.

FIG. 5 is a block diagram showing an example of the configuration of a conventional digital wireless telephone having a recording function capable of recording only the latest fixed amount of transmitted / received voice during a call, a so-called memo recording function, which is the same as FIG. Reference numerals indicate the same or corresponding portions, 9 is a signal switching unit, and 10 is a memory unit. In the digital wireless telephone having the memo recording function shown in FIG. 5, the transmitted voice is digitized by the A / D converter 5, and the received voice is digital data decoded by the voice decoder 42. , A fixed amount of the latest data is constantly stored / updated in the memory unit 10. When the voice data stored in the memory unit 10 is reproduced, the signal switching unit 9 is switched to D / A convert the added transmitted / received voice stored in the memory unit 10 as digital data together. The unit 6 converts the analog signal and outputs it as a voice recording from the speaker 8.

In the conventional digital radio telephone having the memo recording function as shown in FIG. 5, since the voice signal is directly stored in the memory section 10 as a digitized signal,
There is a problem that the amount of data is large and the recording time is short, and a large capacity memory is required.

[0007]

The conventional digital radiotelephone set forth above has a problem that it consumes a large amount of power and the talk time for making a call without replacing the battery is short, and is provided with a memo recording function. The device has a problem that the recording time is short and a large capacity memory is required.

The present invention has been made in order to solve the above problems, and it is possible to reduce the power consumption, and in a device having a memo recording function, the recording time can be lengthened without increasing the memory capacity. It is an object of the present invention to provide a digital wireless telephone capable of simplifying the device configuration.

[0009]

A digital radio telephone according to the present invention comprises means for judging whether or not voice is actually included in a transmission signal, and only when voice is actually included in a transmission signal. It is characterized by a configuration for operating the encoding unit.

In a digital radio telephone having a so-called memo recording function, transmission data encoded by the encoding unit is stored / updated in the memory, and reception data before being decoded by the decoding unit is stored / updated in the memory. It is characterized in that a memo recording function is configured by means.

Further, there is provided means for judging whether or not voice is actually on the transmission signal, and when the voice is actually on this transmission signal, only the transmission signal is stored in the memory.
By updating, and when there is no voice in the transmitted signal, the received signal is stored / updated in the memory, so that one memory is used in time division and the decoding unit is configured in one system. It is characterized by

Further, this is performed by the received signal, or by both the transmitted signal and the received signal, or means for operating the encoding unit only when voice is actually present on the transmitted signal is provided. It is characterized by being added.

[0013]

【Example】

Example 1. 1 is a block diagram for explaining a first embodiment of the present invention and corresponds to FIG. 4 showing a conventional device. In FIG. 1, the same reference numerals as those in FIG. 4 indicate the same or corresponding portions, and 43 is a voice determination control unit. In the first embodiment of the present invention shown in FIG. 1, the voice determination control unit 43 includes the A / D conversion unit 5
It is configured to determine whether or not voice is actually present in the digitally processed signal output from the device, and operate the voice encoding unit 41 only while the voice is actually present to perform encoding processing. .

This judgment may be made by the absolute value or the comparison value of the signal voltage output from the A / D converter 5, but it can also be made at the stage of the analog audio signal (not shown). Also, the voice encoding unit 41 based on this determination result.
There are methods of controlling the clock signal of the processor that is actually performing the encoding process, a method of interrupting a part of the circuit that configures the hardware, etc., but the power consumption is as low as possible when stopped. Therefore, any control method may be used so that a normal encoding operation can be performed immediately during operation. Further, if the timing difference between the determination of the presence / absence of a voice signal and the encoding process becomes a problem, the voice encoding unit 4
An appropriate delay circuit (buffer) may be inserted in the preceding stage of 1. With the above-described configuration, the amount of data processing becomes enormous when voice is not actually received, and it is not necessary to perform voice encoding processing that consumes a large amount of power, and power consumption can be reduced.

Example 2. FIG. 2 is a block diagram for explaining the second embodiment of the present invention and is a diagram corresponding to FIG. 5 showing a conventional device. 2, the same reference numerals as those in FIG. 5 indicate the same or corresponding portions, and reference numerals 421 and 422 denote speech decoding units. In the conventional digital wireless telephone having a memo recording function shown in FIG. 5, since the signal obtained by digitizing the voice signal as it is is stored in the memory unit as described above, the amount of data to be stored becomes large and the recording time becomes long. It gets shorter. However, in this type of digital radio telephone, encoding processing is performed in wireless transmission / reception, and encoded data compressed in a data amount is transmitted / received. Therefore, a voice encoding unit and voice decoding for that purpose are performed. It has a section. Therefore, in the second embodiment shown in FIG. 2, the transmission voice data is stored in the memory unit 10 as the data encoded and compressed by the voice encoding unit 41, and the reception voice data is decoded and output from the baseband unit 3. The previous compressed data is stored in the memory unit 10.

That is, in FIG. 2, at the time of transmission, the data coded by the speech coding unit 41 is the baseband unit 3.
Is simultaneously output to the memory unit 10, and the memory unit 10 constantly stores / updates the latest fixed amount of transmission data. Further, at the time of normal reception, the compressed encoded data output from the baseband unit 3 passes through the memory unit 10, and the memory unit 10 stores / updates the latest fixed amount of received data and the voice decoding unit 422. After being decoded, it is input to the speaker 8 as an analog voice signal in the D / A converter 6 via the signal switching unit 9 and the received voice is output.
Further, at the time of reproduction, the latest fixed amount of the transmitted voice coded data and the received voice coded data stored in the memory unit 10 are separately decoded by the voice decoding unit 421 and the voice decoding unit 422, respectively, and signal switching is performed. The data respectively decoded by the unit 9 are added and output as recorded sound through the D / A conversion unit 6 and the speaker 8.

As described above, in the second embodiment, since the encoded and compressed voice data is stored / updated in the memory unit, the memory capacity is small and the recording can be performed for a relatively long time. Note that the voice encoding unit 41 is provided with a voice determination control unit 43 (not shown) as in the embodiment shown in FIG. 1, and the voice encoding unit 41 operates only when an actual voice is present in the output signal. It is also possible to use a device with low power consumption.

Example 3. FIG. 3 is a block diagram for explaining the third embodiment of the present invention, and the same reference numerals as those in FIGS. 1 and 2 denote the same or corresponding parts. In the above-described second embodiment shown in FIG. 2, the latest fixed amount of both the transmission coded data and the reception coded data is constantly stored in parallel in the memory unit 10, and the transmission coded data and the reception code are stored. Since it is necessary to simultaneously decode the decoded data and the decoded data, two systems are required for the memory and the voice decoding unit of the memory unit 10, and the decoded data needs to be added by the signal switching unit 9. However, in normal transmission / reception, it is rare that transmission and reception completely overlap each other, and experiments have shown that storing one of these parts is sufficiently useful as a memo recording function of this kind. are doing. Therefore, this Example 3
Then, as shown in FIG.
When the output from the conversion unit 5 actually includes voice, only the transmission encoded data output from the voice encoding unit 41 is stored in the memory unit 10. When the voice is not present, the base code is stored. The configuration is such that the encoded data received from the band unit 3 is stored in the memory unit 10 and the memory unit and the audio decoding unit are configured in one system by using the memory unit 10 in a time-division manner, which simplifies the hardware configuration. It is a device that can record memos for a long period of time.

In the third embodiment described above, the presence or absence of the transmitted voice is judged and the transmitted voice coded data is stored only when the transmitted voice is present, and the received voice is stored in the other cases. On the contrary, it may be a device that judges the presence or absence of the received voice and stores the received voice coded data only when the received voice is present, and otherwise stores the transmitted voice, or both the transmitted voice and the received voice. It is also possible to determine whether or not there is a voice, and to store the memory for both the transmitted voice and the received voice only when the voice is actually present. Further, when there is no transmitted voice, a low power consumption device that stops the operation of the voice encoding unit 41 may be used as in the first embodiment.

[0020]

As described above, the digital radio telephone of the present invention can be a low power consumption type device, and even in a device having a memo recording function, the memory capacity is small and the circuit scale is such that recording can be performed for a long time. There is an effect that the device can be simplified.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining a first embodiment of the present invention.

FIG. 2 is a block diagram for explaining a second embodiment of the present invention.

FIG. 3 is a block diagram for explaining a third embodiment of the present invention.

FIG. 4 is a block diagram showing an example of a configuration of a conventional digital wireless telephone.

FIG. 5 is a block diagram showing an example of a configuration of a conventional digital wireless telephone.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 Radio part 3 Baseband part 4 Voice CODEC part 5 A / D conversion part 6 D / A conversion part 7 Microphone 8 Speaker 9 Signal switching part 10 Memory part 41 Voice coding part 42 Voice decoding part 43 Voice judgment control part 421, 422 speech decoding unit

Claims (6)

[Claims] 1. A transmitter converts a voice signal into a digital signal, and an encoder further encodes the signal to reduce the amount of data and transmits it as a radio signal. The receiver decodes the received radio signal by a decoder. A digital wireless telephone that converts to an analog voice signal and outputs it as voice is equipped with a means to determine whether or not voice is actually on the transmission signal, and the above code is used only when voice is actually on the transmission signal. A digital wireless telephone characterized by a configuration for operating a conversion unit. 2. The transmitting unit converts the voice signal into a digital signal, and the encoding unit further encodes it to reduce the data amount and transmits it as a radio signal. The receiving unit decodes the received radio signal by the decoding unit. In a digital wireless telephone that has a recording function (so-called memo recording function) that constantly converts the analog voice signal and outputs it as voice, and constantly records the latest fixed amount of transmitted and received voice, the transmission signal is the data encoded by the encoding unit. Is stored in the memory and updated, and the received signal is configured to have the recording function by means of storing / updating the encoded data before decoding in the decoding unit in the memory. 3. A means for determining whether or not voice is actually on the transmission signal, and when the voice is actually on the transmission signal, only the transmission signal is stored / updated in the memory. In the case where no sound is added to the transmission signal, the reception signal is stored / updated in the memory, so that one memory is used in a time-sharing manner and the decoding unit is used in one system. The digital wireless telephone according to claim 2, wherein the digital wireless telephone is constructed. 4. A means for determining whether or not voice is actually on the received signal, and when the voice is actually on the received signal, only the received signal is stored / updated in the memory. In the case where the received signal is not voiced, the transmission signal is stored / updated in the memory so that one memory is used in a time-sharing manner and the decoding unit is used in one system. The digital wireless telephone according to claim 2, wherein the digital wireless telephone is constructed. 5. A means for determining whether or not voice is actually on the transmission signal and the reception signal, and when the voice is actually on the transmission signal, only the transmission signal is stored in the memory. / By updating, and when the received signal is actually voiced, only the received signal is stored / updated in the memory, so that one memory is used in a time division manner and the decoding unit is used. 3. The digital radiotelephone set forth in claim 2, wherein the digital radiotelephone is constituted by one system. 6. The digital radio telephone according to claim 2, further comprising means for operating the encoding unit only when voice is actually included in the transmission signal.