Mixer, mixing method and session system using the mixer

A conference system and mixing technology, applied in speech analysis, speech synthesis, transducer circuits, etc., can solve the problems of noise, speech discontinuity, data overflow, etc.

Inactive Publication Date: 2010-02-24
BEIJING PHILISENSE TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0007] Therefore, the object of the present invention is: provide a kind of sound mixing system and method that can solve the phenomenon of noise and voice discontinuity caused by linear superposition and data overflow in the existing sound mixing system

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  • Mixer, mixing method and session system using the mixer
  • Mixer, mixing method and session system using the mixer
  • Mixer, mixing method and session system using the mixer

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Embodiment Construction

[0018] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0019] In addition, in all the drawings for describing the embodiments, parts having the same functions are denoted by the same symbols, and repeated descriptions are omitted.

[0020] The sound mixing device of the present invention utilizes the masking field effect of the human ear, that is, the phenomenon that the auditory perception of a weaker sound (masked sound) is affected by another stronger sound (masking sound), due to the masking effect of the human ear Domain effect, so that when a large speech signal (or speech signal with strong energy) and a small speech signal (or speech signal with weak energy) exist at the same time, the small speech signal cannot be effectively recognized by the human ear. Therefore, In an actual conferencing system, when many people speak at the same time, usually only the voices of a small number of people with loud voices ...

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Abstract

Disclosed are a mixer, a mixing method and a session system using the mixer. The mixer comprises a root-mean-square calculator(201) which is used for calculating root-mean-square value of N audio datain a preset time respectively, wherein N is larger than or equal to 1, and N is an integer; a comparator(202) which compares the calculated N root-mean-square values so as to sequence the calculatedN root-mean-square values, and attaches identifying information showing the sequence of the root-mean-square values to the N audio data; a mixing coefficient distributor(203) which distributes coefficients for mixing calculation respectively for the N audio data according to the attached identifying information, wherein, the coefficient distributed for the N audio data decreases successively according to a decreasing sequence of the root-mean-square values; and a mixer(204) for performing weight sum on the N audio data and the coefficients distributed therefor respectively, so as to obtain themixing signal after mixing.

Description

technical field [0001] The present invention relates to a sound mixing device and method for mixing digital voice signals from multiple devices, in particular, to a sound mixing device and method for multimedia conferences. Background technique [0002] In modern society, multimedia conferencing has been applied in more and more occasions, and audio data is the most basic element in multimedia conferencing. In a multimedia conference, it is usually necessary to use a central processing device or a terminal device to mix multiple audio data and output the mixed signal. [0003] In an existing sound mixing system, generally, audio data from various devices are linearly superimposed. However, the usual voice data is 16bit quantized (or less, such as 8bit), and its value range is -32768≤sample value≤32767. Therefore, the method of directly linearly superimposing multiple audio data will bring overflow problems , and generate noise. [0004] For such a problem, consider that i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/00G10L13/00H04R3/00G10L19/008
Inventor 杨振华曹忻军施亮
Owner BEIJING PHILISENSE TECH
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