Sound volume controller

Abstract

An embodiment of the present invention relates to a volume controller, comprising: a first resistor connected to an input terminal of an audio signal; a first capacitor connected to the first resistor; an amplifier connected to the first capacitor; The second capacitor is connected with the amplifier and the output end of the audio signal; the volume detection module is connected with the output end of the audio signal, and is used to detect the size of the audio signal, and sends a control signal when it exceeds a predetermined value; the volume The control module is connected with the volume detection module and connected between the first resistor and the first capacitor, and is used for attenuating the audio signal according to the control signal. Therefore, the volume controller in the embodiment of the present invention uses the volume detection module to detect the size of the sound signal, and controls the volume control module to attenuate the sound signal after exceeding a predetermined value, thereby achieving a good music playback effect on a small-sized speaker without producing Breaking sound.

Description

technical field [0001] The embodiment of the present invention relates to the field of control, in particular to a volume controller. Background technique [0002] With the development of the times, more and more mobile terminals are used, and mobile terminals with the function of playing music are also becoming more and more common. Cracked and hoarse crackles. The voltage signal of the sound is the superposition of sine waves of different frequencies. The louder the sound, the higher the developing voltage, and the larger the swing of the voice coil driving the speaker, thus making a louder sound. When the voltage increases to a certain level, the voice coil of the speaker reaches the limit value. If the voltage continues to increase, the voice coil of the speaker will exceed the limit value, resulting in broken sound, which not only makes the sound unpleasant, but also damages the speaker. [0003] One of the solutions is to increase the power of the speaker, which is t...

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Problems solved by technology

[0003] One of the solutions is to increase the power of the speaker, which is to increase the volume and power consumption of the speaker, which requires a large-sized speaker and a corresponding reasonable sound cavity design. However, due to the limitation of the size of the mobile terminal itself, the size requirements are very strict, so the speaker The size can only be small to provide suitable sound pressure in a limited frequency range

And small speakers are prone to broken sounds when playing audio with a relatively wide dynamic range (such as music)

[0004] Another method is to reduce the volume, which is relatively wide with the dynamic range of the music. Therefore, in order not to produce broken sounds, the volume of the entire music must be adjusted to a very low level. Although the maximum volume is not distorted by the broken sounds, the rest of the music is Can not get the desired effect because the volume is too low

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