Subwoofer with volume being controlled by television sound envelope line

Abstract

Provided is a subwoofer with volume being controlled by a television sound envelope line. The subwoofer comprises a low pass filter, an audio sensor, a frequency spectrum modification circuit and a voltage-controlled gain amplifier. The lower pass filter has an input end in connection with an output end of a television line and filters required lower-frequency audio signals. The audio sensor is disposed adjacent to a loudspeaker of a television. Audio signals of the television that are detected by the audio sensor go through the frequency spectrum modification circuit, and feedback of low sound and other unwanted components are filtered, thereby forming a level envelop line representing the real-time volume of the television. Then the volume of the low-frequency audio signals outputted by the low pass filter is controlled by the level via the voltage-controlled gain amplifier. The low-frequency audio signals drive the loudspeaker after being amplified by an original low sound amplifier of the television. The subwoofer of the invention has the advantages that the subwoofer has a simple structure, is easy to implement, can be matched with all televisions, compensates the low sound components with low cost and significantly improves the sound quality.

Description

technical field [0001] The invention relates to a subwoofer whose volume is controlled by the envelope of the TV sound, which can match all TV sets, compensate the bass component with low cost, and obviously improve the sound quality of the TV sound. Background technique [0002] After the color TV became thinner and lighter, the speakers became smaller and thinner, the frequency response became worse and worse, and the low frequency part was seriously insufficient. In this case, it is possible to simply add a subwoofer (commonly known as a subwoofer) to make up for the missing low-frequency part, but most of the current TVs only have a standard line output terminal for constant-level audio. The filter filters out the low-frequency part, but the output level does not adjust with the volume adjustment of the TV, that is to say, the volume of the external subwoofer cannot change in proportion to that of the TV, but each tune is different, and the user experience is very good. ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a subwoofer whose volume is controlled by the envelope of the TV sound, so as to solve the problem in the prior art that after the color TV becomes thinner and thinner, the speaker becomes smaller and thinner, and the frequency response becomes worse and worse. The problem that the low frequency part is seriously insufficient

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