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Level adjustment circuit and audio system using it

A level adjustment and level technology, applied in the direction of electrical components, amplification control, gain control, etc., can solve problems such as clipping

Active Publication Date: 2016-08-24
ROHM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the gain of the amplifier circuit is fixed, if the amplitude of the audio signal is too large, it will be clipped (fixed level) because it exceeds the voltage range that can be amplified in the subsequent stage, resulting in distortion

Method used

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  • Level adjustment circuit and audio system using it
  • Level adjustment circuit and audio system using it
  • Level adjustment circuit and audio system using it

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Embodiment Construction

[0028] Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. The same or equivalent structural elements, members, and processes shown in the respective drawings are assigned the same reference numerals, and duplicative descriptions are omitted as appropriate. In addition, the embodiments are not limited to the embodiments of the invention but are examples, and all the features or combinations thereof described in the embodiments are not necessarily essential features or combinations of the invention.

[0029] figure 1 It is a block diagram showing the structure of the audio system 2 including the level adjustment circuit 100 of the embodiment. The audio system 2 is mounted on an electronic device capable of reproducing audio signals. Examples of electronic equipment include a head unit of a car audio, an amplifier of a home audio, a television, a mobile phone terminal, and the like.

[0030] The audio system 2 in...

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Abstract

The level adjustment circuit of the present invention enables volume control with little jarring feeling. In the circuit for adjusting the level of the audio signal, the filters (12) respectively receive the audio signal (S1) and pass the respective set frequency bands. The variable gain amplifiers (14) each amplify the output signal of the corresponding filter (12) provided correspondingly to each filter (12). A summer (16) adds the input audio signal and the respective output signals of the variable gain amplifiers (14). The control unit (20) monitors the respective output signals of the variable gain amplifiers (14), and controls the respective gains of the variable gain amplifiers (14) according to the levels.

Description

technical field [0001] The present invention relates to techniques for preventing clipping of audio signals. Background technique [0002] In order to output an audio signal from a speaker or earphone (hereinafter, collectively referred to as a speaker), an amplifier circuit that amplifies a minute electric signal is used. The level of the audio signal input to the amplifier circuit, that is, the volume, changes every moment for each input source (source), the audio content to be reproduced, or the circuit state of the preceding stage. For example, it is known to make televisions sound very differently during viewing, during business, and during programming. When the gain of the amplifier circuit is fixed, if the amplitude of the audio signal is too large, it will be clipped (level fixed) because it exceeds the voltage range that can be amplified in the subsequent stage, and distortion will occur. [0003] In order to solve this problem, a method of monitoring the level of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G3/20H03F1/32
Inventor 山田望人
Owner ROHM CO LTD