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
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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

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  • Method for eliminating sound effect switching noise and audio play equipment
  • Method for eliminating sound effect switching noise and audio play equipment
  • Method for eliminating sound effect switching noise and audio play equipment

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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 le

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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

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Claims

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Application Information

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Owner ACTIONS ZHUHAI TECH CO
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