High-noise-reduction audio output equipment

Abstract

The invention discloses high-noise-reduction audio output equipment which comprises an audio control input end, an oscillatory frequency mixing part, a noise elimination part and an audio output part which are connected in sequence, wherein a high-frequency oscillatory circuit and a low-frequency oscillatory circuit in the oscillatory frequency mixing part are connected in parallel and then connected between an oscillatory control circuit and a frequency mixer; the input end of an amplifier circuit in the noise elimination part is connected with the frequency mixer; a negative feedback circuit is used for receiving a signal of the amplifier circuit and feeding back the signal to the amplifier circuit; the output end of the amplifier circuit is connected with the audio output part through a noise elimination circuit; the audio output part comprises a power amplifier output circuit and a loudspeaker which are connected in sequence; the input end of the power amplifier output circuit is connected with the noise elimination circuit; the noise elimination circuit comprises an input circuit, a power amplifier chip and an output circuit which are connected in sequence. The audio output equipment has the benefits of remarkable noise reduction effect and relatively low power consumption.

Description

technical field [0001] The invention belongs to the field of information dissemination equipment, and more specifically relates to a high-noise reduction audio output equipment. Background technique [0002] In the existing production and life, many occasions require the use of calling equipment to transmit short-distance signals, but with the development of social life, especially in cities where there are more and more high-rise buildings, general calling equipment When used in a multi-floor environment, due to the noisy environment and electromagnetic mutual interference, the audio output of the calling device is very noisy. If the power consumption is reduced, the normal sound will become smaller, which is not conducive to the spread of information; With high power, the audio output will increase, but the noise will also increase at the same time, which will not only cause noise pollution, but also increase the power and consume more energy. Therefore, designing an audi...

AI Technical Summary

Problems solved by technology

[0002] In existing production and life, calling devices are needed to transmit short-distance signals in many occasions. However, with the development of social life, especially in cities where there are more and more high-rise buildings, general calling devices When used in a multi-floor environment, due to the noisy environment and electromagnetic mutual interference, the audio output of the calling device is very noisy. If the power consumption is reduced, the normal sound will become smaller, which is not conducive to the dissemination of information; With high power, the audio output will become larger, but the noise will also become larger at the same time, which will not only cause noise pollution, but also increase the power and consume more energy

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