Method and apparatus in a telecommunications system

Details Method and apparatus in a telecommunications system Method and apparatus in a telecommunications system

2005-03-29

2005-03-29

Chawan, Vijay B. (Department: 2654)

Data processing: speech signal processing, linguistics, language

Speech signal processing

Synthesis

C704S220000, C704S219000, C704S264000, C704S268000

Reexamination Certificate

active

06873954

ABSTRACT:
Audio artifacts due to overrun or underrun in a playout buffer caused by the sampling rates at a sending and receiving side not being at the same rate are reduced. An LPC-residual is modified on a sample-by-sample basis. The LPC-residual block, which includes N samples, is converted to a block comprising N+1 or N−1 samples. A sample rate controller decides whether samples should be added to or removed from the LPC-residual. The exact position at which to add respective remove samples is either chosen arbitrarily or found by searching for low energy segments in the LPC-residual. A speech synthesiser module then reproduces the speech. By using the proposed sample rate conversion method the playout buffer can be continuously controlled. Furthermore, since the method works on a sample-by-sample basis the buffer can be kept to a minimum and hence no extra delay is introduced.

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Krembel, L., European Patent Office Standard Search Report, File No. RS 103654 SE, Oct., 22, 1999, pp. 1-4.

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