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Self-adapted volume control method

A volume control and self-adaptive technology, applied in the direction of gain control, amplification control, instruments, etc., can solve the problems of impracticability and inability to completely isolate the microphone and speaker, and achieve the effect of reducing interference and reducing interference

Inactive Publication Date: 2008-06-04
SICHUAN CHANGHONG ELECTRIC CO LTD
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Problems solved by technology

[0003] To solve the above problems, the most direct way is to keep the microphone of the advertising machine to detect external environmental noise away from the speaker, so that the microphone cannot receive the sound from the speaker. However, due to the limitation of the advertising machine's own space, it is impossible to completely isolate the microphone from the speaker. , this method is basically impracticable

Method used

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  • Self-adapted volume control method

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Embodiment

[0028] This embodiment takes the advertising machine installed in the elevator room of a building as an example:

[0029] First, install an advertising player with an environmental noise detection module in the elevator room, and input an audio signal with a fixed frequency such as 1KHz to the whole machine when it is quiet in the early morning. According to the principle that the sound of the advertising machine itself is small, the impact on the microphone is small, and when the sound of its own sound is loud, the impact on the microphone is greater. For the section where the output volume of the advertising machine speaker is less than 40% of the maximum output volume of the whole machine, no recording is made. For The sections whose volume is greater than 40% of the maximum output volume are divided into 5 sections as shown in Table 1 for detection and recording. Detect the input power corresponding to the microphones at each point in the 5 intervals, and then calculate th...

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Abstract

The invention relates to an automatic control technology, in particular to an adaptive volume control method. The invention discloses a volume control method which is adaptive to the environment noise, which comprises the following steps: a. the detection value Px of a microphone relevant to the output volume of a loudspeaker is measured in a quiet environment; b. the value P<X> is saved; c. the detection value P of the microphone relevant to the output volume of the loudspeaker is measured in an application environment; d. the difference between the value P and the value Px is used as a parameter to control the loudspeaker. The invention has the advantages that the interference imposed on the microphone by the loudspeaker can be reduced significantly, which allows the control of the loudspeaker volume to be more suitable for the requirement of the practical environment, and the loudspeaker volume can be adjusted according to the noise while the interference in environment from the loudspeaker can be reduced.

Description

technical field [0001] The invention relates to automatic control technology, in particular to an adaptive volume control method. Background technique [0002] At present, many advertising companies have placed advertising machines such as video playback systems in public places such as commercial buildings, apartments, and elevators, providing people with a large amount of daily life information. In order to reduce the impact of the advertising machine on people's lives, considering its special purpose, a noise detection module is added to the advertising machine, and the environmental noise data is collected through the microphone (usually the environmental noise power), and the noise data is used as a parameter to control the volume of the speaker. , according to the external noise state, adjust the output volume of the advertising machine, so that people can hear clear advertising media information in various noise environments. The main design difficulty of this kind o...

Claims

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Application Information

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IPC IPC(8): H03G3/20G09F25/00G09F27/00
Inventor 梁敏肖涛张泽栋
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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