JPH07254877A - Digital mobile radio equipment - Google Patents

Abstract

PURPOSE:To provide the digital mobile radio equipment which prevents unnecessary power consumption even in the case of a high input voice level. CONSTITUTION:An A/D converter 2 which subjects a voice signal to A/D conversion, a voice encoding part 4 which encodes the obtained digital voice signal and outputs encoded voice data, a transmission part 5 which modulates obtained encoded voice data and outputs it from an antenna 6, a reception part 7 which converts the signal received by the antenna 6 to a base band and demodulates and outputs encoded voice data, a voice decoding part 8A which selects the normal decoding processing or the simple decoding processing to execute the decoding processing of encoded voice data from the reception part 7 and outputs a digital voice signal, a silence detection part 3A which discriminates whether the digital voice signal is in the sound state higher than a prescribed level or in the silent state equal to or lower than the prescribed level, and a control part 12 which commands selection of operation stop' of the voice encoding part 4 and the transmission part 5 and selection of the simple decoding processing of the voice decoding part 8A are provided.

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 such as a portable radio telephone which controls power consumption reduction based on a voice signal.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a configuration of a conventional digital mobile radio apparatus such as a portable radio telephone. A control unit 12 for controlling the entire operation digitally outputs an analog voice signal from an input terminal 1. A / D converter 2 for converting to a voice signal, connected to the A / D converter 2, connected to a voice encoding unit 4 for encoding a digital voice signal and outputting encoded voice data, and a voice encoding unit 4. A transmitter 5 for frequency-modulating the coded voice data into a radio frequency band and outputting it from an antenna 6 is connected.

Similarly, the control unit 12 has an antenna 6
A reception unit 7 that converts the signal received in step S1 to baseband, demodulates and outputs encoded voice data, a voice decoding unit 8 that is connected to the reception unit 7 and decodes the encoded voice data into a digital voice signal, and a voice. A D / A converter 10 that is connected to the decoding unit 8 and that converts a digital audio signal into an analog audio signal and outputs the analog audio signal to an output terminal 11 is connected.

Further, the control unit 12 includes an A / D converter 2
Connected to the output terminal of, and there is no audio input at input terminal 1,
When a silence state in which only low-level noise in the surroundings is input is detected, a transmission silence detection unit 3 that outputs a stop signal is connected. The transmission silence detection unit 3 includes the speech coding unit 4 and the transmission unit 5. Connected to.

Next, the operation of the conventional digital mobile radio apparatus having such a configuration will be described. During a normal call, the voice uttered by the user is input from the input terminal 1, converted into a digital voice signal by the A / D converter 2, and then converted into encoded voice data by the voice encoding unit 4, which is then encoded. The voice data is frequency-modulated by the transmitter 5 into a radio frequency band and output from the antenna 6. On the other hand, the radio wave received by the antenna 6 is demodulated by the receiving unit 7 into encoded voice data, decoded by the voice decoding unit 8 into a digital voice signal, and D
The / A converter 10 converts the analog audio signal and outputs the analog audio signal.

However, in a silent state in which the user is listening to the other party even during communication and only low-level ambient noise is input to the input terminal 1, the transmission silence detector 3 detects the silent state. Is detected, and in response to a command from the control unit 12, the transmission silence detector 3 to the voice encoder 4 and the transmitter 5
A stop signal is input to. In this way, when the stop signal is input from the transmission silence detector 3, the voice encoder 4 and the transmitter 5 are in the operation stop state. When the voice signal of the user is input to the input terminal 1, the transmission silence detecting section 3 detects the voice state and the control section 12 outputs a voice from the transmission silence detecting section 3 according to a command. The supply of the stop signal to the encoding unit 4 and the transmission unit 5 is cut off.

When the operations of the voice coding unit 4 and the transmission unit 5 are stopped in the silent state in which the user is not talking as described above, the ambient noise is not transmitted to the partner terminal, but the reception from the partner terminal is not received. As a result, the communication using the digital mobile radio device does not cause any trouble, and in this case, when the user starts a call, the operations of the voice encoding unit 4 and the transmission unit 5 are restarted. By this operation, useless power consumption in the voice encoding unit 4 and the transmission unit 5 is prevented, and the operating power consumption of the digital mobile radio device can be reduced.

[0008]

In the above-mentioned conventional digital mobile radio apparatus, the level of the voice signal input to the input terminal 1 distinguishes between the voiced state and the silent state, and the user emits a voice. If there is no sound, it is judged that there is no sound when the surrounding noise level is low, but there is no problem, but when the user is not making a sound and the surrounding noise level is high, it is judged that there is a sound condition. Speech coding unit 4 and transmission unit 5
Does not stop operating. Therefore, ambient noise is converted into encoded voice data by the voice encoding unit 4, and the encoded voice data is frequency-modulated in the radio frequency band by the transmitting unit 5 and output from the antenna 6, which is wasteful. Power is consumed and power consumption is not reduced in the voiced state.

The present invention has been made in order to solve the above-described problems in the conventional digital mobile radio apparatus, and its object is to achieve a high voice input level even in a voiced state.
An object of the present invention is to provide a digital mobile radio device capable of preventing wasteful consumption of electric power.

[0010]

In order to achieve the above object, the present invention provides an analog / digital converting means for converting an analog audio signal into a digital audio signal, and a digital converted by the analog / digital converting means. Encoding means for encoding a voice signal and outputting encoded voice data;
The encoded voice data output from this encoding means is modulated, converted into a radio frequency and output from an antenna, and the signal received by the antenna is converted into baseband to demodulate the encoded voice data. Decoding means for outputting a digital audio signal by selecting either normal decoding processing or simple decoding processing for the receiving means for outputting the digital audio signal and the encoded audio data output from the receiving means. Means for determining whether the digital audio signal output from the analog / digital converting means is in a voiced state at a predetermined level or higher or in a silent state at a predetermined level or lower, and based on the determination result of the determination means, It has a control means for selecting the operation and stop of the operation of the encoding means and the transmitting means, and for selecting the normal decoding processing and the simple decoding processing of the decoding means. And it is characterized in and.

[0011]

According to this structure, the judging means judges whether the digital audio signal output from the analog / digital converting means is in a voiced state above a predetermined level or in a silent state below a predetermined level. Then, when it is determined that there is no sound, the encoding means for encoding the digital audio signal obtained by the analog / digital converting means and outputting the encoded audio data, and the encoded audio data output from this encoding means. And transmitting means for modulating and converting to a radio frequency and outputting from the antenna are selected in the inoperative state. At the same time, in this silent state, the decoding means selects the normal decoding process.

For this reason, in the silent state, the encoding means and the transmitting means stop their operations, and unnecessary ambient noise is not transmitted to the other terminal, which is necessary for the operation of the encoding means and the transmitting means. The power is reduced and the decoding means performs a normal decoding process on the encoded voice data from the partner terminal.

Further, when the judging means judges that the digital audio signal output from the analog / digital converting means is in a voiced state of a predetermined level or higher, the analog / digital
An encoding unit that encodes the digital voice signal obtained by the digital converting unit and outputs the encoded voice data, and the encoded voice data that is output from the encoding unit is modulated, converted into a radio frequency, and an antenna. And the transmitting means for outputting from are selected in the operating state. At the same time, in this voiced state, the decoding means selects the simple decoding process.

Therefore, in the voiced state, the decoding means performs a simple decoding process on the encoded voice data from the partner terminal to the extent that the user does not care about the voice quality. The power consumption in the decoding means is reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a block diagram showing the configuration of this embodiment, and the same parts as those in FIG. 2 already described are given the same reference numerals.

As shown in FIG. 1, in the present embodiment, a voice decoding unit 8A is provided in place of the voice decoding unit 8 in the conventional digital mobile radio apparatus already described with reference to FIG. A transmission silence detection section 3A is provided in place of the detection section 3, and this transmission silence detection section 3A is newly connected to the speech decoding section 8A.

Then, the speech decoding unit 8A of the present embodiment selects a normal decoding process or a simple decoding process which has a smaller processing amount than the normal decoding process to perform the decoding process. Is equipped with. In addition, the transmission silence detector 3A of the present embodiment determines and detects the sounded state and the silence state based on the level of the output signal of the A / D converter 2, and in the silence state, the control unit 12 has already issued a command. Similar to the transmission silence detecting unit 3 described above, it has a function of supplying a stop signal for stopping the operations of the voice encoding unit 4 and the transmission unit 5. Further, in the present embodiment, the transmission silence detector 3A
When the voiced state is determined and detected from the level of the output signal of the / D converter 2, the voice decoding unit 8A is instructed by the instruction of the control unit 12.
It has a function of supplying a selection signal for selectively executing the simple decoding process.

The configuration of the other parts of this embodiment is the same as that of the conventional digital mobile radio apparatus already described with reference to FIG.

Next, the operation of this embodiment having such a configuration will be described. During a normal call, the voice uttered by the user is input from the input terminal 1, converted into a digital voice signal by the A / D converter 2, and then encoded by the voice encoder 4 as in the conventional digital mobile radio device. The encoded voice data is converted into encoded voice data, and the encoded voice data is frequency-modulated in the radio frequency band by the transmitter 5 and output from the antenna 6. On the other hand, the radio wave received by the antenna 6 is demodulated into encoded voice data by the receiving unit 7, decoded into a digital voice signal by the voice decoding unit 8A, converted into an analog voice signal by the D / A converter 10, and output. To be done.

Further, in the silent state where the output signal level of the A / D converter 2 is low, for example, when the user is listening to the other party, only low-level ambient noise is input to the input terminal 1. Then, the transmission silence detector 3A detects this silence state, and in response to a command from the controller 12, the transmission silence detector 3A
A stop signal is input to the speech coding unit 4 and the transmission unit 5 from the speech coding unit 4 and the transmission unit 5, and the speech coding unit 4 and the transmission unit 5 are in the operation stopped state. Then, when a voiced state in which the output signal level of the A / D converter 2 is high, for example, a voiced state in which the user's voice signal is input to the input terminal 1, the transmission silence detector 3A detects this voiced state. Then, according to a command from the control unit 12, the supply of the stop signal from the transmission silence detecting unit 3A to the voice encoding unit 4 and the transmission unit 5 is cut off, and the selection signal is supplied from the transmission silence detecting unit 3A to the voice decoding unit 8A. To be done.

For this reason, in the voice decoding unit 8A, the simple decoding process, which has a smaller processing amount than the normal decoding process, is selected by the selection signal, and for the encoded voice data from the partner terminal, the user outputs voice quality. The simple decoding process is executed to the extent that it is not noticeable above.

As described above, in this embodiment, in the silent state where the user is not talking, the voice encoding unit 4
Also, the operation of the transmission unit 5 is stopped, and ambient noise is not transmitted unnecessarily, but in this case, the reception from the partner terminal is performed as usual, and there is no obstacle to communication using the digital mobile radio device. Does not occur. In this case, when the user starts a call, the operations of the voice encoding unit 4 and the transmission unit 5 are restarted, and the normal communication state is restored. In the present embodiment, in the silent state, such an operation prevents useless power consumption in the voice encoding unit 4 and the transmission unit 5, and makes it possible to reduce the operating power consumption of the digital mobile wireless device. Become.

Further, in this embodiment, when the user is talking at a signal level higher than a predetermined level, or when the user is not talking, but the ambient noise is in a voiced state at a predetermined level or higher. In the voice decoding unit 8A, the simple decoding process is performed on the encoded voice data from the partner terminal to the extent that the user does not care about the voice quality, and power consumption in the voice decoding unit 8A is reduced. Be reduced. in this case,
Even if the user himself / herself is making a call or the surrounding noise level is high and the simple decoding process with a smaller processing amount than that of the normal decoding process is performed, the user cannot hear the quality of the voice received. Almost no decrease is felt.

As described above, according to the present embodiment, the power consumption in the voice encoding unit 4 and the transmission unit 5 is reduced in the silent state, and the power consumption in the voice decoding unit 8A is reduced in the voiced state. Thus, it becomes possible to maintain the voice quality required for communication and efficiently communicate with the partner terminal.

[0026]

According to the present invention, in the silent state where the transmission voice level at the user side terminal is low, the encoding means and the transmitting means stop their operation, and unnecessary ambient noise is transmitted to the partner terminal. First, the decoding means performs a normal decoding process on the encoded voice data from the partner terminal, and the partner terminal is operated in a state where the power required for the operation of the coding means and the transmitting means is reduced. In the voiced state in which the transmission voice level of the user side terminal is high, for the encoded voice data from the partner terminal,
In the decoding means, the simplification process is performed, and in the state where the operating power of the decoding means is reduced, the communication with the other terminal is performed with the sound quality that the user does not care about.
In both the silent state and the voiced state, it is possible to always communicate with the other terminal with good sound quality in a state in which the power consumption is significantly reduced.

[Brief description of drawings]

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

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

[Explanation of symbols]

 2 A / D converter 3A Transmission silence detector 4 Voice encoder 5 Transmitter 6 Antenna 7 Receiver 8A Voice decoder 10 D / A converter

Claims (2)

[Claims] 1. An analog / digital converting means for converting an analog audio signal into a digital audio signal, and an encoding means for encoding the digital audio signal converted by the analog / digital converting means and outputting encoded audio data. , Transmitting means for modulating the encoded voice data output from the encoding means, converting the encoded voice data to a radio frequency and outputting from the antenna, and converting the signal received by the antenna to baseband to demodulate the encoded voice data Decoding for outputting a digital audio signal by selecting either a normal decoding process or a simple decoding process for the receiving unit that outputs the digital audio signal and the encoded audio data output from the receiving unit. And the digital audio signal output from the analog / digital conversion means is in a voiced state above a predetermined level or in a silent state below a predetermined level. Determining means for determining whether or not, and based on the determination result of the determining means, the operation and stop of operation of the encoding means and the transmitting means are selected, and the normal decoding processing and the simple decoding processing of the decoding means are performed. And a control unit for selecting the digital mobile radio device. 2. The digital mobile radio apparatus according to claim 1, wherein the simplified decoding process has a smaller amount of decoding processing than the normal decoding process to the extent that no sound quality problem occurs.