JP2001045560A - Portable telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue a speech while reducing a sense of incongruity to a talker by storing voice data to a memory at the start-up of communication or at detection of silencing and reproducing the voice data on the basis of the voice data stored in the memory when there are no voice data in the case of hand- over or at channel switching. SOLUTION: At the start-up of a speech, reproduction of voice data is not immediately started but stored in an FIFO memory 7. After storage of data for a prescribed time without having effect on conversation, the voice data stored in the FIFO memory 7 are fed to a voice processing section 8, which reproduces the voice data. At the start-up of hand-over or switching of channels, although no voice data come from a base station, the voice output is muted in this case when there are no voice data stored in the FIFO memory 7. At the end of hand-over or channel switching, when a speech from the base station is restarted and silencing is detected, storage of the voice data is started again in the FIFO memory 7. When voiced sound is detected, the voice data are immediately reproduced and outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone using a wireless telephone line such as a portable telephone, and more particularly to a reduction in discomfort caused by a silent period occurring at the time of channel switching or handover.

[0002]

2. Description of the Related Art In a portable telephone, a PHS, or the like, when the received electric field strength falls below a predetermined value, voice communication is temporarily interrupted to perform a handover process. The communication channel is switched to the control channel, a control signal periodically intermittently transmitted from the base station is awaited, the CS identification signal included in the control signal is received, and the reception field strength is measured. Is used as a destination base station to resume voice communication.

[0003] At the time of handover or channel switching, voice communication cannot be performed along with the switching operation, and during the time when the voice communication cannot be performed, voice mute is performed or pseudo noise is generated.

[0004]

As described above, when the voice communication is interrupted by the handover or the channel switching process and the voice mute process or the pseudo noise is generated, the voice is interrupted and the caller feels uncomfortable or uncomfortable. It had the problem of making people feel.

An object of the present invention is to reduce a mute time that occurs at the time of channel switching or handover in a portable telephone system.

[0006]

According to the present invention, there is provided a portable telephone which performs wireless transmission and reception with a base station, comprising a silence detecting section for detecting a silence signal from speech data and a memory for storing speech data. The object is achieved by storing voice data in the memory from the start of communication or detecting silence in the memory, and reproducing the voice based on the voice data in the memory even when there is no voice data such as handover or channel switching. ing.

[0007]

FIG. 1 is a diagram showing a relationship between transmitted voice data on a base station side and voice reproduction on a terminal side. FIG. 2 is a block diagram showing an example of the flow of received data.

In the present invention, the base station and the terminal reproduce the stored voice data while storing the voice data in the memory during a normal call. During the silence period that occurs at the time of channel switching or handover, the audio data stored in the memory is continuously reproduced to reduce the silence time and reduce discomfort due to silence. Hereinafter, the present invention will be described in more detail with reference to the drawings and the like.

(1) At the start of a call At the start of a call, sound data is stored in the FIFO memory 7 without immediately starting sound reproduction. After the accumulation for a certain period of time without affecting the conversation is completed, the audio data stored in the FIFO memory 7 is sent to the audio processing unit 8 to reproduce the audio.

(2) At the start of handover or channel switching At the start of handover or channel switching, there is no voice data from the base station. At this time, the voice data stored in the FIFO memory 7 is sent to the voice processing unit 8 to reproduce voice. . When the audio data stored in the FIFO memory 7 is exhausted, the audio output is muted.

(3) At the end of handover or channel switching At the end of handover or channel switching, communication from the base station is resumed.
Then, the storage of the audio data is started again. In the case of a sound, the audio data is immediately reproduced and output as in this example.

(4) In the case where the sound is not sufficiently stored in the FIFO memory 7, the sound reproduction is prohibited from detecting the silence and the sound data is stored in the FIFO memory 7 for a necessary time and the necessary time is stored. Thereafter, the audio data is sent to the audio processing unit 8 and the reproduction of the audio is resumed.

As described above, in the present invention, voice data is first stored in the FIFO memory 7 at the start of a call, and when the stored voice data reaches a certain amount of time that does not hinder the call, the voice data is sent to the voice processing unit 8. Send and play from the speaker. If audio data cannot be received due to handover or channel switching, the terminal continues to reproduce the audio data stored in the FIFO memory 7. This allows
The mute time due to handover or channel switching is shortened by the time stored in the FIFO memory 7, and the sense of incongruity due to audio interruption can be reduced. Further, when the handover or the channel switching is completed, the sound is output to the speaker without storing the sound in the FIFO memory 7 until the silence of the received sound is detected. When the silence detection unit 7 detects silence, the audio data is FI
The data is stored in the FO memory 7, and the data required for the conversation is stored in the FIFO memory 7 without erasing. FIFO
When the audio data for the predetermined time is again stored in the memory 7, the audio data is sent to the audio processing unit 8, and the reproduction of the audio is resumed.

[0014]

As described above, according to the present invention, even when the call is interrupted due to a handover or the like, the interruption of the voice is minimized, and the call can be continued with a sense of discomfort to the caller reduced. Also, in this example, the example of reception from the base station to the terminal has been described, but the same applies to transmission from the terminal to the base station, and a simple configuration can improve the call quality.

[Brief description of the drawings]

FIG. 1 is a diagram showing a relationship between transmission audio data on a base station side and audio reproduction on a terminal side.

FIG. 2 is a block diagram showing an example of a flow of received data.

[Explanation of symbols]

 1 RF section 2 demodulator 3 reception buffer 4 compressed voice expansion 5 silence detection 6 processor 7 FIFO memory 8 voice processing 9 speaker

Claims (1)

[Claims] 1. A portable telephone that performs wireless transmission and reception with a base station, comprising: a silence detection unit that detects a silence signal from audio data; and a memory that stores audio data. Memorize in memory,
A portable telephone system which reproduces sound based on the sound data in the memory even when there is no sound data, such as at the time of handover or channel switching.