System and method of improving transmission accuracy and reduction accuracy of acoustic signal

An acoustic signal and precision technology, applied in the field of acoustic signal transmission, can solve the problems of poor analog signal accuracy and audio out-of-band noise, and achieve the effect of improving accuracy and reducing out-of-band noise.

Pending Publication Date: 2016-06-01
ZILLTEK TECH SHANGHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the process of transmitting the acoustic signal, it is necessary to convert the acoustic signal of the analog signal into a digital signal for transmission, and then restore the digital signal to an analog signal for playback. In the process of converting to an analog signal, usually the sine wave of the acoustic signal The peak and trough points are sampled to form a digital signal. If the above sampling is used, the accuracy of the analog signal is poor in the process of restoring the digital signal to an analog signal, and there may be some out-of-band noise in the played audio.

Method used

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  • System and method of improving transmission accuracy and reduction accuracy of acoustic signal
  • System and method of improving transmission accuracy and reduction accuracy of acoustic signal
  • System and method of improving transmission accuracy and reduction accuracy of acoustic signal

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Embodiment 1

[0033] The purpose of this embodiment is to provide a method and system for improving the accuracy of acoustic signal transmission. The system of this embodiment may include an acquisition module to collect digital information of an acoustic signal as an analog signal, such as figure 1 As shown, this embodiment takes 8 sampling points as an example for illustration. In actual situations, the number of sampling points can be increased, but cannot be less than 8 sampling points.

[0034] In this embodiment, these eight sampling points include a peak point, a valley point, and two zero-crossing points, and the remaining four sampling points are respectively between the peak point, the valley point, and the two zero-crossing points, and their distribution can be figure 1 shown.

[0035] Such as Figure 2a As shown, in the prior art, only the peak point and the trough point are usually sampled, and the analog signal is fitted according to the peak point and the trough point, Fig...

Embodiment 2

[0038] Based on the above-mentioned embodiments, this embodiment provides a system and method for improving the accuracy of acoustic signal restoration, such as the system and method in Embodiment 1, the sine wave within one cycle includes two sampling points, and can generate 16-bit digital Signal, the frequency corresponding to 16 digital signals is 44.1KHZ (kilohertz), and the full dynamic range corresponding to 16 digital signals is 96 decibels (DB), that is, the gain of 16 digital signals is 96+30=116 decibels. The frequency range that the ear can receive is 20HZ (Hertz)-22KHZ, and the maximum can reach 48KHZ. Therefore, the accuracy of the 6-bit digital signal is not enough, and the audio played by the playback device still has a lot of noise.

[0039] Through the system and method of the embodiment, the 16-bit digital signal can be increased to 24-bit, the frequency of the 24-bit can reach about 192KHZ, the full dynamic range of the 24-bit digital signal is 144 decibels,...

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Abstract

The invention relates to the field of acoustic signal transmission, and particularly relates to a system and a method of improving the transmission accuracy and the reduction accuracy of an acoustic signal. An acquisition module acquires digital information of at least eight sine wave sampling points in one cycle; a processing module is connected with the acquisition module for generating a digital signal according to the information of the at least eight sine wave sampling points; an extraction module extracts sampling information of the former N sampling points of one sampling point of the digital signal; a calculating module is connected with the extraction module and adopts an interpolation method to calculate analog information of a sampling point next to the sampling point according to the sampling information; and N is a positive integer, and the digital signal comprises at least eight sampling points.

Description

technical field [0001] The invention relates to the field of acoustic signal transmission, in particular to a system and method for improving the accuracy of acoustic signal transmission and restoration. Background technique [0002] In the process of transmitting the acoustic signal, it is necessary to convert the acoustic signal of the analog signal into a digital signal for transmission, and then restore the digital signal to an analog signal for playback. In the process of converting to an analog signal, usually the sine wave of the acoustic signal The peak and trough points are sampled to form a digital signal. If the above sampling is used, the accuracy of the analog signal is poor in the process of restoring the digital signal to an analog signal, and there may be some out-of-band noise in the played audio. . Contents of the invention [0003] Aiming at the problems existing in the prior art, the present invention provides a system and method for improving the accu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0208
CPCG10L21/0208
Inventor 叶菁华
Owner ZILLTEK TECH SHANGHAI
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