Audio high transient rise time square-wave signal generation system and method

Abstract

The invention discloses an audio high transient rise time square-wave signal generation system and method. According to the system, an FPGA and a DAC are separately connected with a high-speed differential comparator, and the output of the high-speed differential comparator is separately connected with a bias adjustment circuit and an amplitude adjustment circuit. According to the system and method, two channels of sinusoidal waves with a phase difference of 180 degrees are adopted to enter the high-speed comparator and generate a square-wave circuit, the rise time is greatly accelerated, andthe performance of the instrument is enhanced.

Description

technical field

[0001] The invention relates to the technical field of audio testing, in particular to a system and method for generating audio high transient rise time square wave signals. Background technique

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Audio analyzers are widely used in military and civilian fields, and can provide audio frequency response, total harmonic distortion, etc. tests for military radio stations, submarine sonar and other equipment; at the same time, they must generate high-performance sine waves, square waves, and noise excitation signals to provide tests ; The square wave is an important audio excitation signal in the field of audio measurement. Generally, the duty cycle is 50%, and the voltage amplitude is 1V. It is mainly used to test the transient response of audio equipment. The shorter the rise time of the square wave, ...

Examples

Embodiment 1

[0031] In one or more embodiments, a square wave signal generation system with high audio transient rise time is disclosed, which can increase the square wave rise time of audio to ns level, and eliminate the ringing effect of the square wave rising edge , greatly improving the performance of the instrument.

[0032] refer to figure 2 , The audio frequency high transient rise time square wave signal generation system includes: FPGA and DAC are respectively connected with high-speed differential comparator, and the output of high-speed differential comparator is respectively connected with bias adjustment circuit and amplitude adjustment circuit.

[0033] Among them, the structure of the bias adjustment circuit and the amplitude adjustment circuit refers to image 3 , the bias adjustment circuit adds the linear voltage value output by the 16-bit dual-channel serial DAC to the output P and N terminals to adjust the bias of the square wave signal; the amplitude adjustment circu...

Embodiment 2

[0040] In one or more embodiments, a method for generating a square wave signal of an audio high transient rise time is disclosed, comprising:

[0041] Through FPGA and DAC, output two sine wave signals with a phase difference of 180°;

[0042] Two channels of sine wave signals are respectively input to the high-speed differential comparator to compare levels, and two channels of differential square wave signals are output;

[0043] Adjust the bias and amplitude of the square wave signal to make the upper and lower amplitudes of the square wave signal symmetrical;

[0044] When the output interface is configured as a balanced output, the square wave signal is inverted and output at the same time; when the output interface is configured as unbalanced, only one of the square wave signals is output.

[0045] The embodiment of the present invention uses two channels of sine waves with a phase difference of 180 degrees to enter the high-speed comparator to generate a square wave c...

technical field

[0001] The invention relates to the technical field of audio testing, in particular to a system and method for generating audio high transient rise time square wave signals. Background technique

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Audio analyzers are widely used in military and civilian fields, and can provide audio frequency response, total harmonic distortion, etc. tests for military radio stations, submarine sonar and other equipment; at the same time, they must generate high-performance sine waves, square waves, and noise excitation signals to provide tests ; The square wave is an important audio excitation signal in the field of audio measurement. Generally, the duty cycle is 50%, and the voltage amplitude is 1V. It is mainly used to test the transient response of audio equipment. The shorter the rise time of the square wave, ...

Examples

Embodiment 1

[0031] In one or more embodiments, a square wave signal generation system with high audio transient rise time is disclosed, which can increase the square wave rise time of audio to ns level, and eliminate the ringing effect of the square wave rising edge , greatly improving the performance of the instrument.

[0032] refer to figure 2 , The audio frequency high transient rise time square wave signal generation system includes: FPGA and DAC are respectively connected with high-speed differential comparator, and the output of high-speed differential comparator is respectively connected with bias adjustment circuit and amplitude adjustment circuit.

[0033] Among them, the structure of the bias adjustment circuit and the amplitude adjustment circuit refers to image 3 , the bias adjustment circuit adds the linear voltage value output by the 16-bit dual-channel serial DAC to the output P and N terminals to adjust the bias of the square wave signal; the amplitude adjustment circu...

Embodiment 2

[0040] In one or more embodiments, a method for generating a square wave signal of an audio high transient rise time is disclosed, comprising:

[0041] Through FPGA and DAC, output two sine wave signals with a phase difference of 180°;

[0042] Two channels of sine wave signals are respectively input to the high-speed differential comparator to compare levels, and two channels of differential square wave signals are output;

[0043] Adjust the bias and amplitude of the square wave signal to make the upper and lower amplitudes of the square wave signal symmetrical;

[0044] When the output interface is configured as a balanced output, the square wave signal is inverted and output at the same time; when the output interface is configured as unbalanced, only one of the square wave signals is output.

[0045] The embodiment of the present invention uses two channels of sine waves with a phase difference of 180 degrees to enter the high-speed comparator to generate a square wave c...

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