Data processing: speech signal processing – linguistics – language – Audio signal bandwidth compression or expansion
Patent
1997-09-30
2000-08-15
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Audio signal bandwidth compression or expansion
704219, G10L 1904
Patent
active
061049964
ABSTRACT:
An encoder comprising predictive coding means for encoding electronic signals input thereto is disclosed. The predictive coding means is adapted to operate in a first high prediction order mode and in a second lower prediction order mode. The predictive coding means operates in the first and second modes in dependence on an input electronic signal comprising a transient signal. Preferably, the second mode comprises a transient recovery sequence of prediction orders. The transient signal detector determines predictive coding gain as well as a difference in predictive coding gain for a sequential input signal exceeding a threshold. The prediction orders are gradually increased for subsequent signals until the first mode (high) prediction order is attained. A transmission of electronics signals provides for an indication of initiation of a second mode for the predictive coding. Circuitry is included for reception of the second mode initiate signal. There is also disclosed a decoder for decoding signals encoded by the encoder.
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Hudspeth David R.
Nokia Mobile Phones Limited
Storm Donald L.
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