Apparatus for synchronizing a voice coder and a voice decoder of

Details Apparatus for synchronizing a voice coder and a voice decoder of Apparatus for synchronizing a voice coder and a voice decoder of

1995-10-02

1998-06-09

MacDonald, Allen R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704208, 704214, 704226, 704258, 704264, G10L 300

Patent

active

057651280

ABSTRACT:
An apparatus synchronizes a voice coder and a voice decoder which are of the vector-coding type in order to prevent a false synchronization even when a signal having the same period as a string of synchronizing bits is inputted. A noise component adding unit adds a noise component to an input voice signal. Therefore, even if the input voice signal has the same period as that of a string of synchronizing bits and is completely periodic, the periodicity of the input voice signal is lost by the added noise component. Based on the input voice signal which is no longer periodic, a vector-coding unit, a quantizing signal vector generating unit, and a code book index transmitting unit generate code book indexes and transmit the generated code book indexes to a voice decoder. Therefore, the voice decoder is prevented from developing a false synchronization.

REFERENCES:
patent: 4903301 (1990-02-01), Kondo et al.
patent: 5524170 (1996-06-01), Matsuo et al.
patent: 5579430 (1996-11-01), Grill et al.
Alvarez-Cuevas et al. "Voice Synchronization in Packet Switching Networks." IEEE Network, Sep. 1993.

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