Method and device for matching audio amplifier with sound load

Abstract

The invention discloses a method and device for matching an audio amplifier with a sound load. The method for matching an audio amplifier with a sound load comprises the following steps of: I, determining the signal value of a sound signal output by the audio amplifier according to the impedance value of the sound load and the output electric power of the audio amplifier; II, determining the total gain value of the audio amplifier according to the signal value of the sound signal output by the audio amplifier; III, determining the gain value of a middle operation level circuit of the audio amplifier according to the total gain value of the audio amplifier; and IV, adjusting the gain value of the middle operation level circuit of the audio amplifier through a register to match the gain value of the middle operation level circuit of the audio amplifier with the impedance value of the sound load. Due to the adoption of the method and the device, the problem of matching of the audio amplifier with the sound load is solved, and the quality and effect of a sound signal amplified by using the sound load are ensured.

Description

technical field [0001] The invention relates to the technical field of audio amplifiers, in particular to a method and a device for matching sound loads of audio amplifiers. Background technique [0002] In order to achieve maximum professional division of labor to improve production efficiency and reduce product production costs, the current modular and componentized production and sales of consumer electronics products have become a reality, such as the sound module of the TV-audio amplifier. The audio amplifier of the TV is required to be compatible and matched with its sound load as much as possible, that is, the audio amplifier of the TV is required to be compatible and matched with its sound load-electroacoustic conversion equipment such as speakers or earphones. However, it is determined that the audio amplifier of the TV and the speaker The key parameter of the matching performance of electro-acoustic conversion equipment such as speakers or earphones is the impedanc...

AI Technical Summary

Problems solved by technology

The audio amplifier of the TV is required to be compatible and matched with its sound load as much as possible, that is, the audio amplifier of the TV is required to be compatible and matched with its sound load-electroacoustic conversion equipment such as speakers or earphones. However, it is determined that the audio amplifier of the TV and the speaker The key parameter of the matching performance of electro-acoustic conversion equipment such as speakers or earphones is the impedance value of electro-acoustic conversion equipment such as speakers or earphones, and the impedance value of electro-acoustic conversion equipment such as speakers or earphones is related to its design electric power, the size of its own shape and the size of the TV. It is related to the power supply of the audio amplifier of the machine, so it is difficult to unify the impedance value of the sound load such as the speaker or the earphone and other electroacoustic conversion equipment into the impedance value of the same specification. For the sound load of various impedance values, it is necessary to design the audio amplifier of the TV must consider how the audio amplifier is compatible and matches its sound load

[0003] Patent CN 102165690A discloses an audio amplifier with load matching and a load matching method for the audio amplifier. The method proposed in this patent is to use the intermediate signal generated by the limiter to match the sound load. In its disclosed implementation The schematic diagram of the circuit structure of the limiter assembly is given in the example. However, the method of matching the sound load of the audio amplifier proposed by the patent has obvious defects, that is, the method limits the sound signal while limiting the sound signal. Dynamic range, resulting in the smaller the impedance value of the sound load-speaker, the smaller the dynamic range of the sound signal output by the speaker, and the sound quality is thin and not full enough, which makes the sound quality of the sound signal worse, resulting in the sound output by the speaker signal distortion

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