JP2002199088A - Mobile radio terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a load with respect to DSP processing sound data and maximum consumption current and to record a conversation with a communication opposite party. SOLUTION: At the time of recording a held conversation, a control part 1000 controls a switch 12 and DSP 2000, and independently records the received sound data that has been separated by a reception circuit 1 and the transmitted sound data that has been generated by a sound encoder 6 to a storage circuit 4. At the time of hearing the recorded conversation, namely, at the time of reproducing the transmitted sound data and the received sound data, which are recorded in the storage circuit 4, the control part 1000 controls the switch 12 and DSP 2000, converts the received sound data and the transmitted sound data, which are read from the storage circuit 4, into analog sound signals in sound decoders 5a and 5b, and added in an addition circuit 7, then outputted from a loud speaker.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile radio terminal capable of storing transmitted voice and received voice.

[0002]

2. Description of the Related Art A conventional mobile radio terminal will be described with reference to FIGS. As shown in these figures, a conventional mobile radio terminal is configured to transmit / receive a radio signal to / from a base station (not shown) through an antenna 103, and a receiving circuit 101 converts a radio signal received by the antenna 103 into a digital signal. The demodulated received data is demodulated, and voice data (hereinafter referred to as received voice data) is separated from the demodulated result.

[0003] The voice decoder 105 converts the received voice data input via the switch 112 into an analog voice signal, and the amplifier 108 amplifies the analog voice signal. The amplified audio signal is transmitted to the receiver 11
0 is output.

On the other hand, a user's voice is
1 is converted into an electric signal, and this electric signal is
Amplified at 9. The amplified electric signal is converted by the audio encoder 106 into digital signal audio data (hereinafter referred to as transmission audio data). The transmission circuit 102 modulates a carrier signal using the transmission voice data, and transmits a radio signal obtained by the modulation to the antenna 1.
03 is output.

[0005] The storage circuit 104 is composed of a semiconductor memory or the like. Under the control of the control unit 100 which controls and controls each unit of the mobile radio terminal, the received voice data for a predetermined time is associated with the frame identification information. Records and saves. The received voice data recorded here is
The control unit 100 performs read control in response to a user request.

The switch 112 is connected to the control unit 10.
By the switching control of 0, the received voice data is selectively input to the storage circuit 104, and the received voice data read from the storage circuit 104 is input to the voice decoder 105.

First, at the time of a normal call, as shown in FIG. 6, the control unit 10 outputs the received voice data separated by the receiving circuit 101 to the voice decoder 105.
0 controls switching of the switch 112.

When recording the voice of a communication partner during a call, the control unit 100 responds to the user's request by
The switch 112 is controlled so that the received voice data separated by the receiving circuit 101 is output to the voice decoder 105 and the storage circuit 104, and the received voice data is recorded in the storage circuit 104 as shown in FIG.

When the received voice data recorded in the storage circuit 104 is to be reproduced, the control section 100 converts the received voice data read from the storage circuit 104 into a voice as shown in FIG. The switch 112 is controlled so as to output to the decoder 105, and the received voice data is loudspeaked and output.

[0010] The conventional mobile radio terminal configured as described above has a problem that only the voice of the communication partner can be recorded. In order to solve this problem, the mobile radio terminal shown in FIGS. 9 to 11 can record the voice of the interactive user.

A radio signal is transmitted / received to / from a base station (not shown) via an antenna 203, and a receiving circuit 201 demodulates received data digitized from the radio signal received by the antenna 203, and outputs voice data from the demodulation result. (Hereinafter referred to as received voice data).

The voice decoder 205 converts the received voice data or the transmitted voice data input through the switch 212 into an analog voice signal, and outputs the analog voice signal.
8 amplifies this analog audio signal. The amplified audio signal is output from the receiver 210 as a loudspeaker.

On the other hand, the user's voice is
1 is converted into an electric signal, and this electric signal is
Amplified at 9. The amplified electric signal is converted into audio data of a digital signal (hereinafter referred to as transmission audio data) by an audio encoder 206b, and then modulated by a transmission circuit 202 into a radio signal.
3 is output.

The adding circuit 207 adds the analog audio signal output from the audio decoder 205, that is, the analog audio signal of the communication partner, and the electric signal amplified by the amplifier 209, that is, the analog audio signal of the user, and Output to the encoder 206a.

The audio encoder 206a includes the adder 20
7 is converted into digital signal voice data (hereinafter referred to as transmission / reception voice data) and output to the storage circuit 204 via the switch 212.

The storage circuit 204 is made up of a semiconductor memory or the like, and controls the transmission / reception voice data for a predetermined period of time according to the frame identification information under the control of the control unit 200 which controls and controls each unit of the mobile radio terminal. It is also recorded and stored. The received voice data recorded here is read and controlled by the control unit 200 in response to a user request.

The switch 212 is connected to the control unit 20.
By switching control of 0, the transmitted and received voice data is selectively input to the storage circuit 204, or the received voice data separated by the receiving circuit 203 or the transmitted and received voice data read from the storage circuit 204 is selected. Audio decoder 20
Enter 5

First, during a normal call, as shown in FIG. 9, the control unit 20 outputs the received voice data separated by the receiving circuit 201 to the voice decoder 205.
0 controls switching of the switch 212.

When recording a conversation made during a call, the control unit 200 responds to a user's request.
However, as shown in FIG. 10, the received voice data separated by the receiving circuit 201 is output to the voice decoder 205, and the transmitted voice data generated by the voice encoder 206a is output to the storage circuit 204. Then, the switch 212 is switched and the transmitted and received voice data is recorded in the storage circuit 204.

When the user listens to the recorded conversation, that is, reproduces the transmission voice data and the reception voice data recorded in the storage circuit 204, the control unit 100 responds to the user's request by using the control unit 100 shown in FIG. As shown in FIG.
The switch 212 is controlled so as to output the transmitted / received voice data read out from the receiver 04 to the voice decoder 205, and the transmitted / received voice data is loudspeaked.

According to the mobile radio terminal shown in FIGS. 9 to 11, not only the voice of the communication partner but also the voice of the user can be recorded / reproduced. However, in the mobile radio terminal having such a configuration, it is necessary to operate the audio decoder 205 and the audio encoders 206a and 206b simultaneously at the time of recording.
Not only is a SP (Digital Signal Processor) required to have a large processing capability, but there is a problem that the maximum current consumption is large. Further, the received voice data to be recorded has a disadvantage that the sound quality is deteriorated because the decoded voice data is once encoded and then re-encoded.

[0022]

In a conventional mobile radio terminal, one voice decoder and two voice encoders must be operated at the same time when recording a conversation, so that a DSP for realizing these functions has a large processing capacity. Not only is it required, but there is a problem that the maximum current consumption is large. Further, the received voice data to be recorded has a disadvantage that the sound quality is deteriorated because the decoded voice data is once encoded and then re-encoded.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to reduce a load on a DSP for processing voice data and a maximum current consumption, thereby recording a conversation with a communication partner. It is an object of the present invention to provide a mobile radio terminal capable of improving the quality of recorded voice of a communication partner.

[0024]

In order to achieve the above object, the present invention provides a receiving means for receiving a radio signal and extracting voice data of a communication partner from the received radio signal as received voice data; Encoding means for encoding the user's voice as transmitted voice data; transmitting means for transmitting a radio signal addressed to a communication partner using the transmitted voice data encoded by the encoding means; Storage means for respectively storing transmission voice data, first decoding means for decoding coded voice data and received voice data into analog voice signals, coded voice data and received voice data To an analog audio signal, an analog audio signal decoded by the first decoding unit, and an analog audio signal decoded by the second decoding unit. A loudspeaker unit for adding and for loudspeaker output, at the time of a call, a received voice data extracted by the receiving unit first
In the recording, the received voice data extracted by the receiving means and the transmitted voice data generated by the encoding means are recorded in the pre-storage means at the time of recording, and the received voice recorded in the storage means at the time of reproduction. Control means for inputting the data to the first decoding means and for inputting the transmission voice data recorded in the storage means to the second decoding means is provided.

In the mobile radio terminal having the above configuration, the reception voice data extracted by the reception means and the transmission voice data generated by the encoding means are recorded in the storage means at the time of recording, and are recorded in the storage means at the time of reproduction. The received received voice data is input to the first decoding means, and the transmitted voice data recorded in the storage means is input to the second decoding means.

Therefore, according to the mobile radio terminal having the above-described configuration, the configuration of the first decoding unit, the second decoding unit, and the encoding unit related to the processing of the audio data can be performed in any of a call, a recording, and a reproduction. In this case, since only two means need to be operated at the maximum, the load required for processing the audio data is low, and the maximum current consumption can be reduced. In addition, since unnecessary voice encoding and decoding processes can be omitted, deterioration of sound quality can be prevented.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show a configuration of a mobile radio terminal according to an embodiment of the present invention.

Radio signals are transmitted / received to / from a base station (not shown) through the antenna 3.
, Demodulates digitized received data from the radio signal received, and separates voice data (hereinafter referred to as received voice data) from the demodulated result.

The DSP 2000 is a DSP (Digital Signal Processor) that functions as the audio decoders 5a and 5b and the audio encoder 6 in response to a request from the control unit 1000 that controls each unit of the mobile radio terminal.

The voice decoder 5a converts the received voice data input via the switch 12 into an analog voice signal. The audio decoder 5b converts the transmission audio data input from the storage circuit 4 via the switch 12 into an analog audio signal.

The adding circuit 7 adds the analog audio signal converted by the audio decoder 5a and the analog audio signal converted by the audio decoder 5b, and outputs the result to the amplifier 8. The amplifier 8 amplifies the analog audio signal added by the adding circuit 7. The amplified audio signal is output from the receiver 10 as a loudspeaker.

On the other hand, the user's voice is
Is converted into an electric signal, and this electric signal is amplified by the amplifier 9. The amplified electric signal is converted into digital signal voice data (hereinafter referred to as transmission voice data) by the voice encoder 6, and then output to the transmission circuit 2 and the switch 12. The transmission circuit 2 modulates a carrier signal using the transmission voice data, and outputs a radio signal obtained by the modulation to the antenna 3.

The storage circuit 4 is composed of a semiconductor memory or the like, and under the control of the control unit 1000, the switch 12
The received voice data and the transmitted voice data input via the PC are recorded and stored in a format as shown in FIG.

As shown in this figure, in the storage circuit 4, the received voice data and the transmitted voice data each include "Header" indicating the boundary of a voice frame, which is a processing unit of the voice codec, and the time of both data. “Frame No” indicating the target correspondence and “Bit Length” indicating the number of bits in the audio frame of each data are added and recorded. The received voice data and the transmitted voice data recorded here are read and controlled by the control unit 1000 in response to a user request.

It is assumed that the audio decoders 5a and 5b and the audio encoder 6 use a variable rate codec as the audio codec. For this reason, since the received voice data and the transmitted voice data have different coding rates for each voice frame, the number of bits in the voice frame is variable.

In this case, the above “Bit Length”
Indicates the number of bits of the audio frame and information indicating the coding rate, and is used as information at the time of decoding. The “Frame No” can perform time management of the recorded message by associating it with an RTC (Real Time Clock) in the device.

The switch 12 inputs the received voice data separated by the receiving circuit 1 to the voice decoder 5a by the switching control of the control unit 1000 during a call, and records the conversation performed during the call. Is the receiving circuit 1
The received voice data separated by and the transmitted voice data obtained by the voice encoder 6 are input to the storage circuit 4.

The switch 12 is connected to the control unit 100.
When the conversation control recorded in the storage circuit 4 is listened to by the switching control of 0, that is, when the recorded voice data is reproduced,
The received voice data read from the storage circuit 4 is input to the voice decoder 5a, and the transmitted voice data read from the storage circuit 4 is input to the voice decoder 5b.

Next, the operation of the mobile radio terminal having the above configuration will be described. First, a normal call will be described.
In this case, the control unit 1000 requests the DSP 2000 to function as the audio decoder 5a and the audio encoder 6, and controls the switching of the switch 12 as shown in FIG. The received received voice data is output to the voice decoder 5a.

By the switching control of the switch 12, the received voice data separated by the receiving circuit 1 is converted into an analog voice signal by the voice decoder 5a, amplified by the amplifier 8, and then transmitted from the receiver 10. The voice is output.

On the other hand, the voice of the user is converted into an electric signal by the microphone 11 and amplified by the amplifier 9. Then, the amplified electric signal is converted into transmission voice data by the voice encoder 6 and then output to the transmission circuit 2. The transmission circuit 2 modulates the carrier signal using the transmission voice data, and transmits the radio signal obtained by the modulation to the base station via the antenna 3.

Next, description will be made regarding a case where a conversation made during a call is recorded. In this case, the control unit 100
0 requests the DSP 2000 to function as the audio decoder 5a and the audio encoder 6, and controls the switch 12 to switch the reception voice data separated by the reception circuit 1 as shown in FIG. Is output to the storage circuit 4 and the audio decoder 5a, and the transmission audio data generated by the audio encoder 6 is transmitted to the transmission circuit 2
Is output to the storage circuit 4.

Under the switching control of the switch 12, the received voice data separated by the receiving circuit 1 is converted into an analog voice signal by the voice decoder 5a, amplified by the amplifier 8, and then transmitted from the receiver 10. The voice is output. In parallel with this, the received voice data separated by the receiving circuit 1 is controlled by the recording control of the control unit 1000.
It is recorded in the storage circuit 4. On the other hand, the transmission voice data is used in the transmission circuit 2 for modulating the carrier signal, and is recorded in the storage circuit 4 by the recording control of the control unit 1000.

In the recording control of the received voice data and the transmitted voice data by the control unit 1000, the temporal correspondence between the two data and the format shown in FIG.
Information indicating the coding rate of each data is recorded in association with each other.

Next, the case where the recorded conversation is listened to, that is, the transmitted voice data and the received voice data recorded in the storage circuit 4 are reproduced will be described. in this case,
The control unit 1000 requests the DSP 2000 to function as the audio decoders 5a and 5b, and controls the switching of the switch 12 as shown in FIG.
The received voice data read from the storage circuit 4 is output to the voice decoder 5a, and the transmitted voice data read from the storage circuit 4 is output to the voice decoder 5b.

By the switching control of the switch 12, the received voice data read from the storage circuit 4 is:
The audio data is converted into an analog audio signal by the audio decoder 5a, and the transmission audio data read from the storage circuit 4 is converted into an analog audio signal by the audio decoder 5b.

The analog audio signals converted by the audio decoders 5a and 5b are added by an adder circuit 7, amplified by an amplifier 8, and output from a receiver 10. When reading out the received voice data and the transmitted voice data from the storage circuit 4, the control unit 1000 records “Fra” recorded in association with each data.
With reference to “me No”, read control is performed so that the analog audio signals converted by the audio decoders 5a and 5b are temporally matched by the addition of the addition circuit 7.

As described above, in the mobile radio terminal having the above-described configuration, when recording a spoken conversation, the reception voice data separated by the reception circuit 1 and the transmission voice generated by the voice encoder 6 are recorded. Data is recorded in the storage circuit 4 independently of each other.

To listen to the recorded conversation, that is, to reproduce the transmitted voice data and the received voice data recorded in the storage circuit 4, the received voice data read from the storage circuit 4 and the transmitted voice data are transmitted. The audio data is converted into analog audio signals by the audio decoders 5a and 5b, respectively, added by the addition circuit 7, and output as loudspeakers. Therefore, according to the mobile radio terminal having the above configuration, the DSP 2
000 is a DSP 200 that performs audio processing as compared with the conventional DSP 200 because only two functions at the maximum of the audio decoders 5a and 5b and the audio encoder 6 need to operate at the same time.
The load required for 0 is low, and the maximum current consumption can be reduced.

Further, the received voice data recorded in the storage circuit 4 is not subjected to the process of once decoding the decoded voice data as in the prior art, so that the sound quality does not deteriorate.

The present invention is not limited to the above embodiment. For example, a configuration as shown in FIG. 5 can be considered.

The operation of the mobile radio terminal shown in this figure at the time of a call and at the time of recording a conversation is the same as that of the above-described embodiment, but the operation at the time of listening to the recorded conversation is different.

In the configuration shown in FIG. 5, the control unit 1001 alternately reads out the transmission voice data and the reception voice data from the storage circuit 4 in a time division manner at twice the speed as compared with the control unit 1000 of the above-described embodiment. The audio decoder 5c converts the analog audio signals into analog audio signals in a time-division manner, synthesizes these analog audios in consideration of the temporal correspondence, and outputs the amplified audio through the amplifier 8 and the receiver 10.

Even with such a configuration, as in the above-described embodiment, the DSP 2001 requires a lower load on the DSP 2000 for performing the audio processing as compared with the related art, and can reduce the maximum current consumption.

The present invention is not limited to the above embodiment. It goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0056]

As described above, according to the present invention, at the time of recording, the received voice data extracted by the receiving means and the transmitted voice data generated by the encoding means are respectively recorded in the storage means. The received voice data recorded in the storage means is inputted to the first decoding means, and the transmitted voice data recorded in the storage means is inputted to the second decoding means.

Therefore, according to the present invention, the configuration of the first decoding means, the second decoding means, and the encoding means relating to the processing of audio data can be performed at any time during a call, during recording, or during reproduction. Since only two means need to be operated at the maximum, it is possible to provide a mobile radio terminal capable of reducing the load required for processing voice data and reducing the maximum current consumption.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing a configuration of an embodiment of a mobile radio terminal according to the present invention.

FIG. 2 is a circuit block diagram showing a configuration of one embodiment of a mobile radio terminal according to the present invention.

FIG. 3 is a circuit block diagram showing a configuration of an embodiment of the mobile radio terminal according to the present invention.

FIG. 4 is a view for explaining a data format recorded in a storage circuit of the mobile wireless terminal shown in FIG. 1;

FIG. 5 is a circuit block diagram showing a configuration of another embodiment of the mobile radio terminal according to the present invention.

FIG. 6 is a circuit block diagram showing a configuration of a conventional mobile radio terminal.

FIG. 7 is a circuit block diagram showing a configuration of a conventional mobile radio terminal.

FIG. 8 is a circuit block diagram showing a configuration of a conventional mobile radio terminal.

FIG. 9 is a circuit block diagram showing a configuration of a conventional mobile radio terminal.

FIG. 10 is a circuit block diagram showing a configuration of a conventional mobile radio terminal.

FIG. 11 is a circuit block diagram showing a configuration of a conventional mobile radio terminal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Receiving circuit 2 ... Transmission circuit 3 ... Antenna 4 ... Storage circuit 5a, 5b, 5c ... Audio decoder 6 ... Audio encoder 7 ... Addition circuit 8, 9 ... Amplifier 10 ... Receiver 11 ... Microphone 12 ... Switch 1000, 1001 ... Control Part 2000, 2001 ... DSP

Claims (4)

[Claims] A receiving means for receiving a radio signal and extracting voice data of a communication partner from the received radio signal as received voice data; an encoding means for coding a user's voice as transmitted voice data; Using the transmission voice data encoded by the encoding means,
Transmitting means for transmitting a radio signal addressed to the communication partner; storage means capable of storing the received voice data and the transmitted voice data, respectively; the encoded voice data and the received voice data are converted into analog voice signals. First decoding means for decoding; second decoding means for decoding the encoded audio data and the received audio data into an analog audio signal; and an analog audio signal decoded by the first decoding means. A loudspeaker for adding the analog voice signal decoded by the second decoder and loudspeaker output; and inputting the received voice data extracted by the receiver to the first decoder during a call, and recording the voice. Sometimes, the received voice data extracted by the receiving means and the transmitted voice data generated by the encoding means are respectively recorded in the storage means. Control means for inputting the received voice data recorded in a row to the first decoding means, and for inputting the transmitted voice data recorded in the storage means to the second decoding means. Mobile radio terminal. 2. The control means, at the time of recording, converts received voice data extracted by the receiving means and transmitted voice data generated by the encoding means into time information indicating a temporal correspondence between the two data. At the time of reproduction, the received voice data and the transmitted voice data recorded in the storage means are reproduced based on the added time information. 2. The moving apparatus according to claim 1, wherein the received voice data is input to the first decoding unit and the transmitted voice data is input to the second decoding unit so that timings coincide with each other. 3. Wireless terminal. 3. The recording means adds, at the time of recording, the received voice data extracted by the receiving means and the transmitted voice data generated by the encoding means, and size information indicating a data size of each data. The received voice data recorded in the storage means and the size information added to the received voice data are recorded in the first memory at the time of reproduction.
And the transmission voice data recorded in the storage means and the size information added and recorded thereto are input to the second decoding means, and the first decoding means Means for receiving voice data input under the control of the means, performing a decoding process based on the size information input in accordance with the data to decode the received voice data into an analog voice signal; 2. The transmission voice data according to claim 1, wherein the transmission voice data input under the control of (a) is subjected to a decoding process based on the size information input in accordance with the data, and is decoded into an analog voice signal. Wireless terminal. 4. Receiving means for receiving a radio signal and extracting voice data of a communication partner as received voice data from the received radio signal, and encoding means for generating transmitted voice data obtained by encoding a user's voice. Transmitting means for generating a wireless signal addressed to the communication partner using the transmitted voice data generated by the encoding means; and a storage capable of storing the received voice data and the transmitted voice data, respectively. Means, and when one piece of encoded audio data is input,
This audio data is decoded into an analog audio signal and output,
On the other hand, when two encoded audio data are input, these audio data are time-divisionally decoded into an analog audio signal, and the two analog audio signals obtained by the decoding are combined and output. Means for loudspeaking and outputting the analog audio signal output from the decoding means; and receiving voice data extracted by the receiving means during speech communication, and inputting the received voice data to the decoding means. The extracted received voice data and the transmitted voice data generated by the encoding means are respectively recorded in the storage means, and at the time of reproduction, the received voice data and the transmitted voice data recorded in the storage means are decoded by the decoding means. And a control means for inputting the information to the mobile radio terminal.