Unlock instant, AI-driven research and patent intelligence for your innovation.

Error hidden frame reconstruction method based on overlap change compression coding

A technology of compression coding and lapped transformation, applied in speech analysis, instruments, etc., can solve the problem that the effect is not as good as frequency domain interpolation

Inactive Publication Date: 2011-09-14
TSINGHUA UNIV
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with frequency domain interpolation, time domain interpolation method is simpler, but the effect is not as good as frequency domain interpolation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Error hidden frame reconstruction method based on overlap change compression coding
  • Error hidden frame reconstruction method based on overlap change compression coding
  • Error hidden frame reconstruction method based on overlap change compression coding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0192] Take single frame errors as an example. When the error detection device indicates that there is an error (the present invention does not include the error detection part), the error flag is set, the decoding unit does not decode the error frame, and directly replaces it with an all-zero sequence, so it appears in the sub-band decoding frame Figure 6 The phenomenon of the waveform of the shaded part in decoded frame C.

[0193] Figure 6 As shown, when an error occurs in the F2 frame in the audio compression coded frame A, the dotted line part in the overlapped frame B will not be restored, which will result in Er1 and Er2 frame errors in the decoded frame C. When the error frame is reconstructed, five frame buffers ( Figure 7 Shown), the storage of the data frame is as follows Figure 6 The decoded frames C, B0, and B1 store the adjacent correctly decoded frames C0 and C1 before the error frame, B2, B3 store the error frames Er1 and Er2, and B4 stores the adjacent ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention belongs to the field of voice-frequency signal processing technology, it is characterized by that it successively contains the following steps: extracting time-domain transient characteristics in signal subband interior, and extracting interframe spectrum related characteristics; utilizing time-domain transient state and interframe spectrum related value to divide error frame into two stages according to the state, it contains 10 states; according to different error frame state selecting interpolation method to generate frequency spectrum coefficient and frequency domainphase of error frame, calculating time-domain signal and front and rear edge smoothing treatment.

Description

technical field [0001] The invention relates to digital processing and restoration of compressed audio signals, and its realization. The invention belongs to the field of audio signal processing. Background technique [0002] Audio error concealment technology is a technology based on the characteristics of audio signals, combined with the characteristics of human physiological and psychological systems, to recover and estimate the lost information caused by transmission errors. The player uses audio error concealment processing to reduce the degree of sound quality damage and achieve the purpose of improving the audio quality of the receiving end. [0003] In audio signal processing, subband coding and transform coding are usually used to achieve the purpose of compressing audio signals. Traditional digital audio signal encoding and decoding devices using sub-band encoding such as figure 1 and image 3 shown. In the encoder, the analysis filter divides the input signal...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/02G10L19/005G10L19/018
Inventor 贾晓军窦维蓓张树华
Owner TSINGHUA UNIV