Waveform reduction sampling method of signal output

Abstract

This invention discloses a signal outputting wave-shape reducing sampling method. It uses operational frequency of the sound / image output device to divide a transmission multiple to get a sampling ratio in order to first according to a standard operational frequency flatten the primitive digital signal to rebuild a simulating signal, then sample the simulating signal based on the sampling ratio to output a reduced signal. This invention directly uses software to switch sampling ratio at the mainframe end to reduce the signal and output it, therefore, it has output frequency flexibility and is suitable for all kinds of operational frequency and effectively reduces the cost.

Description

technical field [0001] The present invention relates to a signal output technology, in particular to a waveform recovery sampling method for signal output, so that the output frequency is applicable to various operating frequencies without limitation. Background technique [0002] Press, the output of audio or video signals involves sampling technology. Taking audio output as an example, the standard sampling operating frequencies of playback devices are usually 32KHz, 48KHz, and 96KHz or 22.05KHz and 44.1KHz, etc., where the audio sampling rate or sampling frequency (SamplingRate) refers to the number of times the sound waveform is recorded (sampled) within one second. [0003] The sampling method of known audio output is as follows figure 1 As shown, the host 10 is connected to a USB speaker 12 through the USB transmission interface, the communication frequency between the host 10 and the USB speaker 12 is 12MHz, and the playback frequency of the speaker 12 is 12.288MHz, ...

AI Technical Summary

Problems solved by technology

However, this audio sampling method is limited by the operating frequency of the loudspeaker 12, and the matching problem of the frequency synchronization between the host computer 10 and the USB loudspeaker 12 must be considered, so a clock synthesizer 14 must be added in the USB loudspeaker 12 to adjust the frequency; on the other hand , different operating frequencies must use clock synthesizers 14 with different settings, which is extremely inconvenient to use

[0004] Another known technology is to build a sampling rate converter (sampling rate converter) into the loudspeaker, so that the work of sampling rate conversion is transferred to the loudspeaker. However, this makes the structure of the loudspeaker become bulky and leads to cost improve a lot

Images