Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Method for inhibiting pre-echoes of audio transient signals by utilizing frequency domain filtering post-processing

A transient signal and frequency domain filtering technology, which is applied in the field of audio coding, can solve problems such as consumption and audio quality degradation, and achieve the effects of suppressing pre-echo distortion, enhancing peak energy, and improving listening quality

Inactive Publication Date: 2012-09-26
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of audio quality degradation caused by the pre-echo distortion of audio transient signal coding, and avoid the problem of consuming extra coding bits for TNS noise shaping processing at the coding end, the present invention discloses a method that only needs to be processed at the decoding end. The frequency-domain transformation coefficient of the audio transient signal is filtered and post-processed to perform pre-echo suppression, so as to improve the processing effect of the existing audio coding on the transient signal. Compared with the existing audio coding algorithm, it can Further reduce the pre-echo distortion of the transient signal, enhance the transient peak energy, and compared with the processing method of TNS noise shaping at the encoding end, the present invention can improve the decoded audio transient signal without consuming additional encoding bits. listening quality of

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
  • Method for inhibiting pre-echoes of audio transient signals by utilizing frequency domain filtering post-processing
  • Method for inhibiting pre-echoes of audio transient signals by utilizing frequency domain filtering post-processing
  • Method for inhibiting pre-echoes of audio transient signals by utilizing frequency domain filtering post-processing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Through the experiment of post-processing the signal after encoding and decoding a typical audio transient signal (castanate sequence, mono, 44.1kHz sampling rate, 16bit sample precision, encoding rate 32kbps), it is observed that the present invention utilizes the frequency domain. The effect of pre-echo suppression of audio transient signals by filtering post-processing methods.

[0026] The specific implementation of the present invention is as follows:

[0027] At the decoding end, the audio transient signal after encoding and decoding is processed into frames, the frame length is 20ms, and the overlap between frames is 50%;

[0028] At the decoding end, it is judged whether the data frame is transient according to the encoded transient flag bit, if it is a steady frame, it will not be processed; if it is a transient frame, it will be post-pro...

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 invention discloses a method for inhibiting pre-echoes of audio transient signals by utilizing frequency domain filtering post-processing, which belongs to the field of audio signal processing and in particular relates to a post-processing method for carrying out noise shaping on the decoded transient signals in audio coding. The method comprises the following steps: acquiring frequency domain linear prediction coefficients through discrete cosine transform coefficients of the input audio transient signals, and acquiring a short-time post-filter according to the frequency domain linear prediction coefficients; sequentially carrying out short-time post-filtering and spectral tilt compensation filtering on the discrete cosine transform coefficients of the transient signals; carrying outinverse discrete cosine transform on the frequency domain transform coefficients after filtering to restore and acquire time domain signals; and then, carrying out gain adjustment to acquire the transient signals after post-processing. By carrying out filtering processing on the frequency domain of the audio transient signals, the method achieves the noise shaping effect on the time domain, effectively inhibits the pre-echo distortion caused by transient signal coding, enhances the peak energy of the transient signals, and can improve the audio quality of the decoded audio transient signals without consuming additional coding bits.

Description

technical field [0001] The invention relates to a pre-echo suppression method for audio transient signals, in particular to a post-processing method suitable for noise shaping of decoded transient signals in audio coding, and belongs to the technical field of audio coding. Background technique [0002] In perceptual audio coding technology, the distortion caused by pre-echo is a serious problem, especially when the coding rate is low, the impact of pre-echo distortion on sound quality will be more serious. In general, we can classify audio signals into transient and steady-state signals based on the transients and gradients on the time-domain waveform. Transient signals are mostly present in audio sequences with percussion instruments. In perceptual transform coding, insufficient quantization bits will bring about quantization distortion, and the quantization noise will spread evenly in the entire time domain. Since the forward masking time of the human ear is short (genera...

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): G10L21/02G10L19/00G10L21/0208
Inventor 王晶何海龙匡镜明
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products