Method for eliminating sound effect switching noise and audio play equipment
An audio playback and sound effect technology, which is applied in the field of eliminating sound effect switching noise and audio playback equipment, can solve problems such as large space requirements, switching noise, music jumps, etc., and achieve small storage space, avoid sound effect switching noise, and a small amount of calculation. Effect
Active Publication Date: 2009-04-15
ACTIONS ZHUHAI TECH CO
View PDF0 Cites 11 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] Due to the variety of sound effects, an inevitable problem will appear in practical applications: if it is necessary to switch between different sound effects during music playback, due to the large differences between each sound effect, it will cause problems in switching sound effects. There will be obvious jumps in the music played at the time, and it is very likely that switching noise will be generated. The most obvious switching noise is the obvious crackling sound.
However, the above-mentioned existing processing methods have relatively large space requirements and complicated calculations, which are not easy to implement on portable multimedia players.
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0029] The core of solving the sound effect switching noise is to solve the drastic change of PCM data when the sound effect is switched, in other words, to smooth the PCM data when the sound effect is switched. The embodiment of the present invention proposes a noise elimination method for switching between sound effects that occupies less space and implements simplicity. Its basic principle is: when the sound effect is switched, according to the recorded audio PCM value of the last audio data block processed by the first sound effect before the switch, and the audio PCM value of the second sound effect processed after the switch, smoothing is performed to obtain The new audio PCM value, after processing in this way, can completely avoid the drastic change of data and popping noise when switching sound effects, and in terms of space usage, only one data space is needed to record the last one of the first sound effect before switching audio value. If the audio signal includes...
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
Login to View More Abstract
The invention discloses a method used for eliminating sound effect switching noise when playing an audio signal, which consists of sampling points. N sampling points constitute a sliding step length, and N is a natural number. When sound effect is switched, smoothing processing is carried out according to the last recorded audio pulse code modulation (PCM) value of audio data blocks before switching and after first sound effect processing and the audio PCM value of second sound effect processing after switching, thus obtaining a new audio PCM value. The invention also discloses an audio playing device. The proposal of the invention can lead the PCM waveform of audio signals before and after sound effect switching to keep smooth transition, thus avoiding sound effect switching noise. The invention needs extremely small calculation amount and storage space and is very applicable to be applied to portable multi-media players.
Description
technical field [0001] The invention relates to the technical field of audio processing, in particular to a method for eliminating sound effect switching noise and an audio playback device. Background technique [0002] Sound effect technology is to perform spatial surround simulation, sound field widening, dynamic enhancement and other processing on the basis of the original music signal, so as to make the music effect more colorful, the music more pleasing to the ear, and bring better auditory enjoyment to the listener. From the perspective of the waveform, the sound effect will make the waveform of the music signal change to a certain extent. [0003] A specific example is given below. figure 1 Shown is a Pulse Code Modulation (PCM) waveform of a raw audio signal without any effects added. figure 2 for figure 1 The PCM waveform diagram after adding a sound effect to the original audio signal shown is referred to as sound effect 1 for convenience of description; imag...
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
Login to View More IPC IPC(8): G11B20/10
Inventor 谢湘勇陈展
Owner ACTIONS ZHUHAI TECH CO