JPH07254878A - Digital mobile radio equipment - Google Patents

Abstract

PURPOSE:To reduce the power consumption by simplifying the encoding processing of transmission voice in such degree in the case of a high peripheral noise level that the transmission quality is not much degraded and shortening the operation time. CONSTITUTION:When voice is transmitted by transmission or a user, a transmission silence detection part 4 detects the. sound from output data of an A/D converter 3, and a voice encoding part 5 and a transmission part 6 are operated only in this detection period, and thus, the power consumption is reduced. A reception silence detection part 15 discriminates whether voice is transmitted at present or not in accordance with the digital voice signal decoded by a voice decoding part 11 and outputs the discrimination result to the part 5. When the other party of speech transmits voice or the noise level around the other party of speech is high, the other party of speech doesn't sense the degradation of the quality of the voice to the other party of speech even if this quality is somewhat degraded, and therefore, the busy state of the other party of speech is detected by the detection part 15 and is outputted to the encoding part 5 at the time when the user transmits voice. The part 5 performs the encoding processing, where the tone quality is somewhat degraded but the processing volume is reduced, instead of the normal encoding processing to shorten the operation time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital mobile radio apparatus for controlling the reduction of power consumption by a voice signal in a portable radio telephone or the like.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a configuration of a conventional digital mobile radio apparatus. In FIG. 2, this device includes a microphone 1, an amplifier 2 for amplifying a sound signal from the microphone 1, an A / D converter 3 for converting an analog sound signal from the amplifier 2 into a digital sound signal, and a microphone 1. Transmitted silence that detects a silent section in which only a small level of ambient noise is input and outputs a signal for stopping the operation of the speech encoding unit 5 and the transmitting unit 6 described below in order to reduce power consumption. A detector 4 is provided.
Further, in this digital mobile radio apparatus, a voice encoder 5 that outputs a voice data signal obtained by encoding a digital voice signal, and a transmitter 6 that modulates the encoded data and converts the encoded data into a transmission frequency for output. , An antenna duplexer 7, an antenna 8, and a receiving unit 10 for converting a received signal through the antenna duplexer 7 into a baseband and outputting the demodulated data.
And a voice decoding unit 11 for decoding encoded data into a digital voice signal. Furthermore, a D / A converter 12 for converting a digital audio signal into an analog audio signal
An amplifier 13 for amplifying the analog audio signal and a speaker 14 for outputting the analog audio signal from the amplifier 13 are provided.

Next, the operation of this conventional example will be described. During a call, the voice signal of the user from the microphone 1 is converted into a digital voice signal by the A / D converter 3. Further, the data encoded by the voice encoding unit 5 is modulated by the transmitting unit 6 and converted into the transmission frequency, and the radio wave is transmitted from the antenna 8 through the antenna duplexer 7. Further, the radio wave received by the antenna 8 is frequency-converted by the receiving unit 10, demodulated into data, and further decoded by the audio decoding unit 11 into a digital audio signal. The decoded signal is converted into an analog audio signal by the D / A converter 12 and output as audio from the speaker 14. In this case, as in the case where the user is listening to the transmission of the other party of the call, the transmission silence detector 4 detects the silent section in which only the ambient noise with a low input level is input to the microphone 1. Detection is performed based on the output data from the / D converter 3. The operation of the speech encoding unit 5 and the transmission unit 6 is stopped by this detection signal.
Then, again, when the user's voice becomes voiced, the transmission silence detector 4 detects voice based on the output data from the A / D converter 3, and the voice encoder by this detection. 5 and the transmitter 6 operate.

In this way, the operation of the voice coding unit 5 and the transmission unit 6 is stopped only in the section in which the silence of the digital voice signal output from the A / D converter 3 is detected. Therefore, the power consumption can be reduced without any trouble such as interruption of the call.

[0005]

However, in the conventional digital mobile radio apparatus, when the user is listening to the call of the other party, only a low level ambient noise is input to the microphone 1. There is no problem, but if the surrounding noise level is high, even if the user is not speaking, the speaker will be in a voiced state as when the caller is transmitting. That is, when the ambient noise level is high, there is a disadvantage that the voice encoding unit 5 and the transmission unit 6 operate and power consumption cannot be reduced.

The present invention solves such a conventional problem, and when the surrounding noise level is high, the encoding process of the transmission voice is simplified and the encoding process is simplified to the extent that the transmission quality is not significantly deteriorated. It is an object of the present invention to provide an excellent digital mobile radio device capable of shortening processing operation time and reducing power consumption thereof.

[0007]

In order to achieve the above object, the digital mobile radio apparatus according to claim 1 encodes a digital transmission voice signal, or has a smaller processing amount than this encoding process. Coding means for outputting any of the coded voice data processed by the coding processing, and wireless transmission means for modulating the coded data output from the coding means and converting the coded data to a transmission frequency for transmission. A wireless receiving means for outputting encoded voice data demodulated from a wireless received signal, a decoding means for outputting a decoded digital voice signal obtained by processing the encoded voice data from the receiving means, and an encoding means for encoding processing, Alternatively, a reception signal for outputting a signal for selecting an encoding process having a smaller processing amount than this encoding process by determining whether the decoded digital audio signal from the decoding means has voice or silence. It is configured to include a voice or silence detection means.

According to another aspect of the digital mobile radio apparatus of the present invention,
Encoding means for encoding the digital transmission voice signal or outputting encoded voice data processed by the encoding process having a smaller processing amount than this encoding process, and voiced or silent voice of the digital transmission voice signal. Is output to the encoding unit and the transmission unit for transmitting the sound presence / non-sound detection unit for processing the start or stop of the operation, and the encoding unit. Radio transmitting means for modulating coded data and transmitting it after converting it to a transmission frequency, radio receiving means for outputting coded voice data demodulated from a radio reception signal, and coded voice data from the receiving means And a decoding unit that outputs a decoded digital audio signal that has been processed by the encoding unit, and a signal that is used for the encoding process by the encoding unit or that selects a coding process having a smaller processing amount than this encoding process. Decoded digital audio signal is configured to include a voice or the received signal voice or silence detection means determines and outputs whether silence from.

[0009]

In the digital mobile radio apparatus according to the first aspect of the present invention, the encoding means encodes the digitally transmitted voice signal, or the encoding processing having a smaller processing amount than the encoding processing is selected. Signal is output by determining whether the decoded digital audio signal from the decoding means has voice or silence. Therefore, when the other party of the call is busy or when the ambient noise is large, the encoding unit performs the encoding process with a smaller processing amount than the normal encoding process. That is, when the ambient noise level is high, the encoding process of the transmission voice is simplified to the extent that the transmission quality is not significantly reduced, the operation time of the encoding process is shortened, and the power consumption can be reduced.

In the digital mobile radio apparatus according to a second aspect of the present invention, the encoding means encodes the digitally transmitted voice signal, or the encoding processing having a smaller processing amount than this encoding processing is selected. The signal is output by determining whether the decoded digital audio signal from the decoding means is voiced or silent.
When the communication partner is busy or the ambient noise is large, the encoding means performs an encoding process with a smaller processing amount than the normal encoding process. Furthermore, the presence or absence of sound of the digital transmission voice signal is determined, and the start or stop of the operation of the encoding means and the transmitting means is processed. Therefore, as with the digital mobile radio apparatus according to claim 1, when the other party is busy or the ambient noise is loud,
Power consumption is reduced even in the silent section during transmission.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a digital mobile radio apparatus of the present invention will be described in detail below with reference to the drawings. In the following text and drawings, the same components as those in the previous FIG. 2 are designated by the same reference numerals.

FIG. 1 is a block diagram showing the configuration of an embodiment of a digital radio apparatus of the present invention. In FIG. 1, a microphone 1, an amplifier 2 for amplifying a transmission signal from the microphone 1, and an A / D converter 3 for converting an analog audio signal from the amplifier 2 into a digital audio signal are provided. Further, when low-level ambient noise is input to the microphone 1, the silent section is detected, and the operation is stopped by the voice encoding unit 5 and the transmission unit 6 described below in order to reduce power consumption. A transmission silence detector 4 is provided for outputting a signal to cause the silence. Also, a voice encoder 5 for outputting a voice data signal obtained by encoding a digital voice signal.
A transmitting unit 6 that modulates coded data and converts the coded data into a transmission frequency for output; an antenna duplexer 7; an antenna 8; A receiver 10 that outputs demodulated data is provided. The digital mobile radio apparatus also includes a voice decoding unit 11 that decodes encoded data into a digital voice signal, a D / A converter 12 that converts the digital voice signal into an analog voice signal, and an analog voice signal. Amplifier 13, a speaker 14 for outputting an analog voice signal from the amplifier 13, and a voice decoding unit 1.
Based on the decoded data from 1, the reception silence detector 15 is provided for detecting whether the other party of the call is currently speaking or silent.

Next, the operation of this embodiment will be described. During a call, the voice signal of the user from the microphone 1 is converted into a digital voice signal by the A / D converter 3. Further, the data encoded by the voice encoding unit 5 is modulated by the transmitting unit 6 and converted into the transmission frequency, and the radio wave is transmitted from the antenna 8 through the antenna duplexer 7. Further, the radio wave received by the antenna 8 is demodulated into data after being frequency-converted by the receiving unit 10, and further decoded into a digital audio signal by the audio decoding unit 11. The decoded signal is converted into an analog audio signal by the D / A converter 12 and output as audio from the speaker 14.

In this case, the silent section is used when the ambient noise with a low input level is input to the microphone 1 as in the case where the user is listening to the talk of the other party during a call. The detection unit 4 detects from the output data of the A / D converter 3. When the operation of the voice encoding unit 5 and the transmission unit 6 is stopped by this detection, and the voice is transmitted again by the user's voice transmission, the transmission silence detector 4 detects the presence of the output data of the A / D converter 3. The sound is detected, and the voice encoding unit 5 and the transmission unit 6 operate again by this detection. The power consumption is reduced by the operation and the stop of the operation of the voice encoding unit 5 and the transmission unit 6. In this case, the reception silence detector 15 determines whether the voice is present or not from the digital voice signal decoded by the voice decoder 11, and outputs it to the voice encoder 5. Furthermore, when the other party is talking, or when the surrounding noise of the other party is large, even if the voice quality to the other party deteriorates to some extent, the other party does not notice. Therefore, when there is a voice transmitted by the user, the reception silence detector 15 detects the period during which the other party is talking and outputs the detected period to the voice encoder 5. In the voice encoding unit 5, instead of the normal encoding process, an encoding process that slightly deteriorates the sound quality but has a small processing amount is performed to shorten the operation time.

As described above, according to the present embodiment, even when the user is talking, it is detected that the other party is talking, and based on this detection, the sound quality is slightly deteriorated but the processing amount is reduced. With a few simple processes, it is possible to reduce power consumption without hindering the listening of call voice.

[0016]

As is apparent from the above description, in the digital mobile radio apparatus according to the first aspect of the present invention, when the other party of the call is busy or the ambient noise is large, the encoding means performs more processing than the ordinary encoding processing. A small amount of encoding processing is performed. In this case, since the transmission voice encoding process is simplified to the extent that the transmission quality is not significantly reduced, the operation time of the encoding process is shortened and power consumption can be reduced.

According to another aspect of the digital mobile radio apparatus of the present invention, when the called party is busy or the ambient noise is large,
The encoding means performs an encoding process with a processing amount smaller than that of a normal encoding process, determines whether or not a voice signal is present in the digital transmission voice signal, and starts or operates the encoding means and the transmitting means. Claim 1 as it is processing the outage.
Similar to the described digital mobile wireless device, it has an effect that power consumption can be reduced even when the other party is busy or ambient noise is high, and even in a silent section during transmission.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a digital wireless device of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional digital mobile radio device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Microphone 4 Transmitted silence detector 5 Speech encoder 6 Transmitter 10 Receiver 11 Speech decoder 15 Received silence detector

Claims (2)

[Claims] 1. A digital transmission voice signal is encoded and processed.
Or, a coding means for outputting any one of the coded voice data processed by the coding processing with a smaller processing amount than this coding processing, and modulating the coded data output from the coding means, and Radio transmitting means for converting to transmission frequency and transmitting, radio receiving means for outputting encoded voice data demodulated from radio reception signal, and decoded digital voice signal for processing encoded voice data from said receiving means The decoding means and the encoding means perform encoding processing,
Alternatively, a signal for selecting an encoding process having a smaller processing amount than this encoding process is output by determining whether the decoded digital audio signal from the decoding unit is voiced or silent. A digital mobile radio apparatus comprising silence detecting means. 2. A digitally transmitted voice signal is encoded and processed.
Alternatively, an encoding unit that outputs encoded voice data processed by an encoding process that has a smaller processing amount than this encoding process, a determining unit that determines whether the digital transmitted voice signal is voiced or silent, and the determination unit. The result of the determination in (1) is output to the encoding means and the transmitting means, and the transmission voice / silence detection means for processing the operation start or the operation stop, and the encoded data output from the encoding means is modulated. And a radio transmitting means for converting to a transmission frequency and transmitting the same, a radio receiving means for outputting coded voice data demodulated from a radio received signal, and a decoded digital voice signal obtained by processing the coded voice data from the receiving means. And a decoding means for outputting a signal for performing coding processing by the coding means or for selecting a coding processing having a smaller processing amount than this coding processing from the decoding means. Digital mobile radio device comprising digital audio signal is a voice or the received signal voice or silence detection means determines and outputs or silence.