Method for eliminating sound effect switching noise and audio play equipment
A sound effect and noise technology, applied in the field of audio processing, can solve the problems of large space requirements, switching noise, music jumping, etc., achieving the effect of small storage space, avoiding sound effect switching noise, and small calculation amount
Active Publication Date: 2010-10-13
ACTIONS ZHUHAI TECH CO
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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.
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[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...
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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...
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IPC IPC(8): G11B20/10
Inventor 谢湘勇陈展
Owner ACTIONS ZHUHAI TECH CO