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US 2005/0091041 A1Published application
Method and system for speech coding
AssigneeNokia Corporation
InventorsAnssi Ramo, Jani Nurminen, Sakari Himanen, Ari Heikkinen
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AssigneeNokia Corporation
InventorsAnssi Ramo, Jani Nurminen, Sakari Himanen, Ari Heikkinen
Estimating the term…
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.
A method of encoding an audio signal having audio characteristics, said method comprising the steps of:
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:
A coding device for encoding an audio signal with audio characteristics the coding device comprising:
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:
An electronic device comprising:
A communication network, comprising:
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:
Dependencies are inferred from the claim text.