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Determines the budget used to encode lpd/fd transition frames

A transition frame and encoding technology, applied in the field of digital signal encoding/decoding, can solve the problems of quality degradation, insufficient remaining budget of transition encoding transition frames, etc.

Active Publication Date: 2020-11-27
ORANGE SA (FR)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the residual budget for transform coding transition frames is not sufficient and may cause quality degradation at low bitrates

Method used

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  • Determines the budget used to encode lpd/fd transition frames
  • Determines the budget used to encode lpd/fd transition frames
  • Determines the budget used to encode lpd/fd transition frames

Examples

Experimental program
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Embodiment Construction

[0093] Fig. 1 illustrates an audio encoder 100 according to one embodiment of the present invention.

[0094] FIG. 2 is a diagram illustrating steps of an encoding method performed by the audio encoder 100 of FIG. 1 according to an embodiment of the present invention.

[0095] The encoder 100 comprises a receiving unit 101 for receiving in step 201 input signal samples at a specified frequency fs (eg 8, 16, 32 or 48 kHz) and decomposing them into sub-frames of eg 20 milliseconds.

[0096] Once the current frame starts to be received, the pre-processing unit 102 can select the most suitable coding mode for coding the current frame from at least one LPD mode and one FD mode in step 202 . In the following description, MDCT coding for FD mode and CELP coding for LPD mode may be considered for illustrative purposes. There is no restriction on the coding techniques respectively adopted in the LPD mode and the FD mode. Therefore, other modes than CELP mode and MDCT mode can be used...

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Abstract

The invention relates to a method for determining the bit allocation for encoding a transitional frame, which is carried out by an encoder / decoder for encoding / decoding a digital signal, the transitional frame being preceded by a predictively encoded previous frame, the encoding transition a frame comprising a single sub-frame of a transform-coded and predictive-coded transition frame, the method comprising the steps of: allocating (402; 405) a bit rate for the predictive-coded transition sub-frame, said bit rate being equal to the bit rate at the transform-coded transition frame and the minimum value between the first predetermined bit rate value; determine (404; 408) according to the bit rate the first number of bits allocated to the predicted coding transition subframe; and, by the first bit number and the coding transition The number of bits available for the frame is used to calculate (410) a second number of bits allocated for the transform coding transition frame.

Description

technical field [0001] The invention relates to the field of digital signal encoding / decoding. Background technique [0002] The present invention is advantageously applicable to the encoding and / or decoding of sounds including speech and music, ie speech and music mixed together or alternated with each other. [0003] In order to be able to encode speech efficiently at lower bit rates, it is recommended to use CELP-like techniques ("Code Excited Linear Prediction"). In order to encode music efficiently, transform coding techniques are recommended instead. [0004] CELP-like encoders are predictive encoders. Its aim is to mimic speech generation by individual elements: the vocal tract by short-term linear predictions, the vocal cord vibrations during voiced speech by long-term predictions, and the difficult-to-mimetic representation by stimuli from a fixed dictionary (white noise, algebraic expected value) "Innovation". [0005] Transform coders such as MPEG AAC, AAC-LD,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/002G10L19/24G10L19/02G10L19/12
CPCG10L19/002G10L19/24G10L19/0212G10L19/12
Inventor 斯泰凡·雷高特朱利恩·福雷
Owner ORANGE SA (FR)