Method and device for adjusting to adapt speech inputting distance

A technology of distance change and voice input, applied in the direction of amplification control, transducer circuit, sensor, etc., can solve problems such as inconvenience of communication, and achieve the effect of improving satisfaction and comfort

Inactive Publication Date: 2006-08-16
VIMICRO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

If the distance between the speaker and the microphone has to be placed relatively far (distance 3 in the figure), the sound heard by th

Method used

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  • Method and device for adjusting to adapt speech inputting distance
  • Method and device for adjusting to adapt speech inputting distance

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Embodiment Construction

[0029] The invention adopts analog and digital hardware technology, realizes the automatic adjustment of the voice signal amplitude, and achieves the purpose of adapting to the change of the voice input distance.

[0030] Such as figure 2 As shown, the device of this embodiment includes a programmable gain amplifier, an analog-to-digital (AD) conversion module, a digital-to-analog (DA) conversion module, an amplitude statistics module and a gain control module, wherein:

[0031] The programmable gain amplifier is used to amplify the input analog voice signal according to the gain output by the gain control module, and output the amplified analog signal to the AD conversion module. The present invention can also use other amplifiers with adjustable gain.

[0032] The AD conversion module is used to convert the above-mentioned amplified analog signal into a digital voice signal, and output it to the digital-to-analog conversion module and the amplitude statistics module respec...

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Abstract

The method includes the following steps: first setting a target amplitude threshold for signal; after receiving analog sound signals, the analogy sound signals are amplified by amplifier in term of current gain of the amplifier, and then are converted into sampling point sequence of digital signal by A/D converter; when a post- process is made of the sampling point sequence, the amplitude counting module figures out the energy value of each sampling point in current sampling block and makes statistic for it to get a statistical value; the gain control module adjusts the gain of the amplifier by preset control mode in term of the statistical value and the target amplitude threshold. When the distance between user and microphone is changed, the invention can let listener hear a stable voice.

Description

technical field [0001] The invention relates to a voice input method and a device thereof. Background technique [0002] If the distance between the speaker and the microphone changes from time to time, such as during a mobile phone call, the listener will feel that the sound is louder and smaller. Such as figure 1 As shown, if the distance between the speaker and the microphone changes back and forth between distance 1 and distance 2, the amplitude of the electrical signal picked up by the microphone will change significantly (because the energy of the sound wave changes roughly inversely proportional to the square of the distance). These changing voice input signals are wirelessly transmitted to the listener's mobile phone through the speaker's mobile phone, and the listener will feel that the sound is loud and small, which makes the listener feel uncomfortable. If the distance between the speaker and the microphone has to be placed relatively far (distance 3 in the figu...

Claims

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Application Information

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IPC IPC(8): H03G3/20H04R3/00
Inventor 杨作兴
Owner VIMICRO CORP
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