Audio system with protection function and adjusting method of system

Abstract

The invention discloses an audio system with a protection function and an adjusting method of the system The adjusting method mainly comprises the following steps: an A / D conversion unit converts an input current frame audio signal into a digital signal; an EQ unit performs gain processing on the current frame audio signal converted into the digital signal; a compression unit receives the currentframe audio signal output by the EQ unit, compares the energy of the current frame audio signal with a compression starting threshold value, and judges whether the current frame audio signal needs tobe compressed or not according to a comparison result; a D / A conversion unit converts the current frame audio signal processed by the compression unit into an analog signal; and a power amplifier unitamplifies the analog signal output by the D / A conversion unit and drives the loudspeaker to play sound; according to the audio system with the protection function and the adjusting method of the audio system, the compression unit playing a role in protection is additionally arranged in the audio system, and burnout caused by too large signal energy received by the power amplifier unit is avoided.

Description

technical field [0001] The invention relates to the technical field of audio processing, in particular to an audio system with a protection function and an adjustment method thereof. Background technique [0002] EQ (Equalizer, equalizer) is an electronic device that can adjust the amount of signal amplification in each frequency band. It is graphic EQ and full parameter EQ. [0003] FIR (Finite Unit Impulse Response Filter), also known as a non-recursive filter, is the most basic component in a digital signal processing system. It can have strict linear phase-frequency characteristics while ensuring arbitrary amplitude-frequency characteristics. At the same time, its unit sampling response is finite, so the filter is a stable system and is often used in various audio systems. [0004] The principle of EQ adjustment in the audio system is: the audio signal is first processed by the EQ unit to change the gain of each frequency band of the audio signal, and then converted in...

AI Technical Summary

Problems solved by technology

[0006] 1. No protection function: If the gain of the EQ unit corresponding to a certain frequency band is greatly increased, the energy of a certain frequency band will exceed the carrying capacity of the power amplifier unit, resulting in distortion of the sound played by the speaker;

[0007] 2. No automatic equalization and correction function: when the microphone is used for human voice signal input, if the energy of a certain frequency band is insufficient, the sound output by the speaker will be uncomfortable in hearing;

[0008] 3. No phase calibration function: each functional module requires processing time, that is, there is a phase offset between the signal source input and the final speaker output signal; in some high-level audio systems, there is a gap between the input signal and the output signal. The phase shift of the will seriously affect the hearing effect

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