Music audio signal calibration system

Abstract

The invention discloses a music audio signal calibration system. The music audio signal calibration system comprises a signal sampling module and an amplitude modulation feedback module, the signal sampling module uses a signal sampler J1 with a model of DAM-3056AH to sample an original audio signal in the music audio signal calibration system. The amplitude modulation feedback module uses a triode Q1, a triode Q2 and a resistor RW1 to form an amplitude modulation circuit to adjust signal amplitude. Meanwhile, an inductor L4, a capacitor C2 and an operational amplifier AR2 are used for forminga frequency modulation circuit to filter a signal interference frequency component; one path of an output signal of the operational amplifier AR2 is input into an in-phase input end of the operational amplifier AR3; the operational amplifier AR3 compares the signals; two paths of signals are buffered by an operational amplifier AR4; and finally, the operational amplifier AR5 amplifies an output signal of the operational amplifier AR4 in the same phase. An output signal of the operational amplifier AR3 changes the signal potential of the inverting input end of the operational amplifier AR5, the output signal potential difference of the operational amplifier AR2 and the operational amplifier AR4 is detected by using a triode Q4, and finally, the output signal of the operational amplifier AR5 is an alarm analysis signal of the music audio signal calibration system terminal.

Description

technical field [0001] The invention relates to the field of audio technology, in particular to a music audio signal calibration system. Background technique [0002] At present, pitch training is carried out in music teaching, adopting the mode of electronic teaching, at first original acoustic signal (for example, such as the sound that originates from natural sound source such as the voice of people and the sound of classical musical instrument etc.) is recorded into audio signal, then An acoustic signal that accurately reflects the original acoustic signal (in particular also reflects the natural properties of the original acoustic signal, eg characteristics such as a human voice or a classical musical instrument, etc.) is reproduced from such an audio signal. [0003] For converting sound pressure (sound) into electrical signals (such as generated in microphones and electric guitar pickups, etc.) and for converting electrical signals into electrical signals (such as gen...

AI Technical Summary

Problems solved by technology

[0003] For converting sound pressure (sound) into electrical signals (such as generated in microphones and electric guitar pickups, etc.) and for converting electrical signals into electrical signals (such as generated in speakers, headphones, hydrophones, etc.) ) acoustic signals, using electroacoustic transducers, the operation of most currently used electroacoustic transducers is based on the interaction between an electrical conductor (essentially in the form of a coil) and a magnetic field around the conductor, so the teaching To train students’ relative pitch, it is necessary to ensure the original audio signal, and then the electro-acoustic transducer will destroy the original audio signal to a certain extent, resulting in impure audio in the music teaching player, which seriously affects the teaching quality

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