Level-custom multi-protocol digital audio signal generating system and method

Abstract

The invention discloses a level-custom multi-protocol digital audio signal generating system, comprising an upper computer, an FPGA (field programmable gate array) and a digital-analog converter; the upper computer is connected with the FPGA that is connected with the digital-analog converter; the FPGA includes a status code storage, a waveform generating module, an amplitude adjusting module, a data coding module, a clock division module and a protocol output module. The level-custom multi-protocol digital audio signal generating system has the advantages that a hardware circuit capable of implementing various digital audio protocol standards is established, output logic level is customizable, and quantitative test analysis can be provided for logic level compatibility of a device under test.

Description

technical field [0001] The invention relates to the field of audio analysis, in particular to a level-defining multi-protocol digital audio signal generation system and method. Background technique [0002] At present, there are many different types of digital audio interfaces in the digital audio field. The mainstream interface standards include two standards: consumer digital audio interface S / PDIF digital audio interconnection and professional digital audio interface AES / EBU digital audio interface. The digital audio generation and analysis function of the current audio analyzer is mainly aimed at the generation and analysis of the signals of the two standards of the S / PDIF interface and the AES / EBU interface. During the test, the audio analyzer generates digital signals that meet the corresponding digital audio protocol standards and inputs them into the digital audio receiving device to detect the decoding performance of the digital audio receiving device. The audio an...

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Problems solved by technology

[0004] The digital audio signal generation scheme of the general audio analyzer is complicated, and a special logic level generation circuit needs to be designed; the digital audio standard is single, and each digital audio standard requires a special encoding chip to realize the digital audio signal generation; the flexibility is poor, and it can only output Several typical logic levels such as +5V, +3.3V, +2.5V, +1.8V and +1.2V can only give qualitative indicators of typical logic levels when testing the logic level compatibility of receiving equipment, but cannot give Quantitative indicators for specific logic level compatibility

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