Digital audio signal processing method

Abstract

A digital audio signal processing method disclosed by the present invention is characterized in that by embedding other content of a fixed format in a digital audio signal, a purpose of transmitting the digital information reconditely is achieved. The method mainly utilizes a masking effect of a human auditory system, so that the digital audio signal carries the predetermined data. By the method of the present invention, the data needing to be transmitted can be embedded at an appropriate position of the digital audio signal, and when the digital audio signal is played, an audio signal used for representing the relevant data information at the embedded position can be masked, so that human ears can not perceive the audio signal, but the audio signal can be received by a device possessing the audio signal processing capability.

Description

technical field [0001] The invention relates to a digital audio signal processing technology, in particular to a method for digital audio signal processing based on psychoacoustics and using masking effect. Background technique [0002] Utilizing digital audio signals to carry information is a technology that has attracted wide attention in the industry and invested considerable manpower and financial resources in research and development. Utilizing such technology, people can listen to music and watch TV programs normally while using equipment with audio signal processing capabilities, such as mobile communication terminals, to obtain the data information carried in the aforementioned music or TV programs. An important feature to evaluate whether this technology is mature and suitable for application is: this technology should not only ensure that the data carried can be accurately collected and transmitted, but also ensure that when the digital audio signal itself is playe...

AI Technical Summary

Problems solved by technology

Therefore, even if the energy of the sound coding information is selectively distributed in the frequency range of 18Hz to 20kHz, quite a lot of people, especially children, can still hear it; When using this technology to encode TV and radio programs, you will still be troubled by noise or interfering sounds

[0007] On the other hand, although it is possible to selectively distribute the energy of the sound coding information outside the audible frequency range (20Hz-20kHz) of the human ear, since the frequency response characteristics of most audio equipment are based on the audible frequency range of the human ear The sound range is designed and manufactured. For audio signals outside the frequency range of 20Hz to 20kHz, they are generally filtered out as noise or noise. Therefore, even if the sound coding information can be mixed into the normal audio signal, it is not It cannot be played by audio equipment, so it cannot be obtained by receiving equipment

[0008] In summary, the above-mentioned technologies are obviously immature, so it is impossible to be widely used

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