Polarity testing device of horns

Abstract

The invention discloses a polarity testing device of horns, and the device comprises a single chip microcomputer, a left sound channel output control circuit, a left microphone, a front voltage amplification circuit of the left microphone, a left power amplification circuit, a left zero-crossing comparison circuit, a right sound channel output control circuit, a right microphone, a front voltage amplification circuit of the right microphone, a right power amplification circuit, a right zero-crossing comparison circuit, an alarm circuit, a keyboard control / function conversion circuit and a power circuit. The device can conveniently detect whether earphones have the problem that a left horn and a right horn are in reversed connection and whether a single horn has the problem of reversed polarities, thereby helping improve the outgoing quality of the horns.

Description

[technical field] [0001] The invention relates to a horn polarity testing device. [Background technique] [0002] see figure 1 , is a schematic diagram of speaker wiring in the earphone, the positive pole of the left speaker L is connected to the signal input terminal L of the left speaker 0 Connection, the positive pole of the right horn R is connected to the signal input terminal R of the right horn 0 Connection, the negative poles of the left horn L and the right horn R are grounded. The so-called reverse connection of the left and right speakers means that the positive pole of the left speaker L is connected to the signal input terminal R of the right speaker. 0 Connect, the positive pole of the right speaker R and the signal input port of the left speaker L 0 Connect, and the negative poles of the left horn L and the right horn R are both grounded; the so-called reverse polarity of the horn means that the positive pole of the horn is grounded and the negative pole o...

AI Technical Summary

Problems solved by technology

[0003] At present, the speaker polarity testers on the market are all monophonic, so the speaker polarity tester has no ability to judge whether the left and right speakers are reversed. Therefore, mass-produced headphones, even if the left and right speakers are reversed , can not be tested with the existing speaker polarity tester, so the quality of the earphone product cannot be guaranteed

[0004] Furthermore, the existing horn polarity tester judges the polarity by comparing the amplitude of the sound signal output by the horn with the standard signal to roughly judge the horn polarity. Therefore, the horn polarity tester cannot accurately judge The phase difference between the sound signal output by the speaker and the standard signal

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