Method and system for speech coding
First Claim
1. A method of encoding an audio signal having audio characteristics, said method comprising the steps of:
- segmenting the audio signal into a plurality of segments based on the audio characteristics of the audio signal; and
encoding the segments with different encoding settings.
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Abstract
A method and device for use in conjunction with an encoder for encoding an audio signal into a plurality of parameters. Based on the behavior of the parameters, such as pitch, voicing, energy and spectral amplitude information of the audio signal, the audio signal can be segmented, so that the parameter update rate can be optimized. The parameters of the segmented audio signal are recorded in a storage medium or transmitted to a decoder so as to allow the decoder to reconstruct the audio signal based on the parameters indicative of the segment audio signals. For example, based on the pitch characteristic, the pitch contour can be approximated by a plurality of contour segments. An adaptive downsampling method is used to update the parameters based on the contour segments so as to reduce the update rate. At the decoder, the parameters are updated at the original rate.
56 Citations
32 Claims
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1. A method of encoding an audio signal having audio characteristics, said method comprising the steps of:
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segmenting the audio signal into a plurality of segments based on the audio characteristics of the audio signal; and
encoding the segments with different encoding settings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A decoder for generating a audio signal indicative of an audio signal having audio characteristics, wherein the audio signal is coded in a coding step into a plurality of parameters at a data rate, and the coding step is adjusted based on the characteristics of the audio characteristics of audio signals for providing an adjusted representation of the parameters, said decoder comprising:
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an input for receiving audio data indicative of the parameters in the adjusted representation; and
a module, responsive to the audio data, for generating the audio signal based on the adjusted representation and the characteristics of the audio signal. - View Dependent Claims (20, 21)
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22. A coding device for encoding an audio signal with audio characteristics the coding device comprising:
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an input for receiving audio data indicative of the characteristics; and
an adjustment module for adjusting the parameters based on the characteristics of the audio signal for providing an adjusted representation of the parameters. - View Dependent Claims (23, 24, 25)
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26. A computer software product embodied in an electronically readable medium for use in conjunction with an audio coding device, the audio coding device encoding an audio signal with audio characteristics for providing a plurality of parameters indicative of the audio signal, said computer software product comprising:
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a code for determining the characteristics of the audio signal; and
a code for adjusting the parameters based on the characteristics of the audio signal for providing an adjusted representation of the parameters.
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27. An electronic device comprising:
a decoder for generating a synthesized audio signal indicative of an audio signal having audio characteristics, wherein the audio signal is coded in a coding step into a plurality of parameters at a data rate, and the coding step is adjusted based on the characteristics of the audio characteristics of audio signals for providing an adjusted representation of the parameters; and
an input for receiving audio data indicative of the parameters in the adjusted representation for providing the audio data to the decoder, so as to allow the decoder to generate the synthesized audio signal based on the adjusted representation.- View Dependent Claims (28, 29, 30)
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31. A communication network, comprising:
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a plurality of base stations; and
a plurality of mobile stations adapted to communicating with the base stations, wherein at least one the mobile stations comprises;
a decoder for generating a synthesized audio signal indicative of an audio signal having audio characteristics, wherein the audio signal is coded in a coding step into a plurality of parameters at a data rate, and the coding step is adjusted based on the characteristics of the audio characteristics of audio signals for providing an adjusted representation of the parameters; and
an input for receiving audio data indicative of the parameters in the adjusted representation from at least one of the base stations for providing the audio data to the decoder, so as to allow the decoder to generate the synthesized audio signal based on the adjusted representation.
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32. A decoder for reconstructing an audio signal, wherein the audio signal is encoded for providing parameters indicative of the audio signal, the parameters including pitch contour data containing a plurality of pitch values representative of an audio segment in time, and wherein the pitch contour data in the audio segment in time is approximated by a plurality of consecutive sub-segments in the audio segment, each of said sub-segments defined by a first end point and a second end point, said decoder comprising:
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an input for receiving audio data indicative of the end points defining the sub-segments; and
a reconstruction module for reconstructing the audio segment based on the received audio data.
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Specification