Method and device for restoring signal under speaker cut-off frequency to original sound

A cut-off frequency, speaker technology, applied in the direction of instruments, sensors, transducer circuits, etc., can solve the problems of changing the bass sound quality, the sound performance is not good enough, etc.

Active Publication Date: 2011-02-02
SHENZHEN FOCALTECH SYST
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Problems solved by technology

The existing virtual bass technology does not take this into consideration, and sometimes the timbre performance is not good enough
The virtual bass may also change the tone pattern of the original sound, especially for the sound of percussion music, so it is possible to change the sound quality of the bass

Method used

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  • Method and device for restoring signal under speaker cut-off frequency to original sound
  • Method and device for restoring signal under speaker cut-off frequency to original sound
  • Method and device for restoring signal under speaker cut-off frequency to original sound

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no. 1 example

[0070] In the first embodiment of the present invention, stereo audio commonly used in electroacoustic systems is used as the signal source of the device, and other types of signal sources or channel signal sources can be implemented with reference to this embodiment. In most cases, the low-frequency sound signal has no obvious directionality, so the bass signals of the two channels can be combined for processing to simplify the calculation. For the acquisition of the low-frequency audio signal, the two signals can be averaged after low-pass filtering respectively, or the two signals can be averaged and then filtered. In each embodiment of the present invention, the two signals are averaged and then filtered. . The signals of the left and right channels are respectively input into the sub-band filter processing module 100 and are output by two high-pass filters higher than the cut-off frequency f of the loudspeaker c The left and right channel high audio signals; the left and...

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Abstract

The invention relates to an audio signal processing method and an audio signal processing device for restoring a signal under speaker cut-off frequency to the original sound, which aim to extend the equivalent sound range of a small-sized speaker and enhance the expression of low sound. A virtual low-sound harmonic wave sequence is generated by a feedforward self-multiplication operation method and singly by the grain corresponding to each harmonic wave respectively, so that the proportion of the harmonic waves can be freely controlled and the tone can be controlled; the gain applied to the virtual low-sound signal is adjusted by a virtual low-sound signal sound-type control method and according to the impacting process and the releasing process to control the sound types of the virtual low-sound signal so as to control the hearing feeling of the final sound signal according to requirements to make the sound from 'knocking' more abundant; and the virtual low-sound signal processing effect is enhanced by combining techniques such as a low-sound dynamic range compression technique, a power conservation filter technique, a low-sound signal frequency redivision technique and the like, even if under high speaker cut-off frequency, the quality of the original low sound can still be restored by effectively restoring the virtual low-sound signal.

Description

technical field [0001] The invention relates to audio signal processing, in particular to a method and a device for processing audio signals based on acoustic principles so that the audio frequency band of the loudspeaker for actually restoring sound is extended to the low end. Background technique [0002] The electroacoustic system is an essential part of the multimedia system. With the gradual miniaturization of electronic equipment and electronic components, the common output device of the electroacoustic system, the speaker, is also becoming smaller and smaller, which makes multimedia equipment more portable, beautiful, and power-saving. However, from the perspective of high-fidelity electro-acoustic systems, small speakers are a great disadvantage, that is, when the volume of speakers and speakers becomes smaller, their bass cutoff frequency will increase, that is to say, the smaller the volume Small speakers cannot reproduce low frequency sounds below the cutoff freq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L13/00G10L21/00H04R3/00
Inventor 张靖凯
Owner SHENZHEN FOCALTECH SYST
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