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US 6,856,961 B2Granted
Speech coding system with input signal transformation
AssigneeMindspeed Technologies, Inc.
InventorJes Thyssen
Life of this patent
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Abstract
The invention provides a speech coding system with input signal transformation that may reduce or essentially eliminate “silence noise” from the input or speech signal. The speech coding system may comprise an encoder disposed to receive an input signal. The encoder ramps the input signal to a zero-level when a portion of the input signal comprises silence noise.
Claims23
A speech coding system with input signal transformation, the speech coding system comprising:
- an encoder disposed to receive an input signal, the encoder to provide a bitstream based upon a speech coding of a portion of the input signal,
- where the encoder adaptively tracks a zero-level and at least one quantization level of the input signal;
- where the encoder calculates at least one silence detection parameter;
- and
- where the encoder compares the at least one silence detection parameter of the input signal to at least one threshold;
- and
- where the encoder ramps the input signal to the zero-level when the portion of the input signal comprises the silence noise.
4 more elements
A method of transforming an input signal in a speech coding system, the method comprising:
- adaptively tracking a zero-level and at least one quantization level of the input signal;
- calculating at least one silence detection parameter;
- comparing the at least one silence detection parameter to at least one threshold;
- determining whether the input signal comprises a silence noise;
- and
- ramping the input signal to the zero-level when the input signal comprises the silence noise.
3 more elements
Dependencies are inferred from the claim text.