Method and device for adjusting volume of digital graphic equalizer
A graphic equalizer and volume adjustment technology, applied in the direction of artificial gain control, etc., can solve problems such as sound turbidity
Active Publication Date: 2012-04-04
WUXI ZGMICRO ELECTRONICS CO LTD
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[0015] The embodiment of the present invention provides a volume adjustment method and device of a digital graphic equalizer, which is used to solve the problem that the gain may be adjusted to a larger value when adjusting the gain in the prior art. Adjust the low-frequency gain to a larger value, and the low-frequency band of the audio signal generally has a lot of energy, so a large number of samples in the final output audio signal z[n] are truncated at this time, resulting in the problem of muddy sound
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[0031] The embodiment of the present invention provides a volume adjustment method of a digital graphic equalizer, which filters the input original digital audio signal to obtain N band-pass audio signals; Adding and summing the signals to obtain the first intermediate signal; obtaining the amplitude gain of each bandpass signal, and using the obtained amplitude gain to obtain the gain influence amount representing the amplitude change of the first intermediate signal relative to the original digital audio signal according to the preset rule , convert the gain influence amount into a gain adjustment amount according to a preset mapping rule; combine the gain adjustment amount and the preset volume gain value to obtain an audio gain, and use the audio gain to adjust the amplitude of the first intermediate signal to obtain a second The intermediate signal is used to limit the amplitude of the second intermediate signal to obtain an output signal whose word length is consistent wi...
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The invention discloses a method and a device for adjusting volume of a digital graphic equalizer. The method includes the steps of filtering input original digital audio signals to obtain N band-pass audio signals; summing the N band-pass audio signals gained by exerting different amplitude and the original digital audio signals to obtain a first middle signal, obtaining gain influence quantity of the first middle signal relative to amplitude change of the original digital audio signals by utilizing amplitude gain according to a preset rule, and converting the gain influence quantity into gain adjustment quantity according to a preset mapping rule; combining the gain adjustment quantity and a preset volume gain value to obtain audio gain, obtaining a second middle signal by utilizing the audio gain to adjust the amplitude of the first middle signal, and limiting amplitude of the second middle signal to obtain an output signal with word length identical to the word length of an input signal. The volume adjusting method and the device of the digital graphic equalizer are used for resolving the problem that in the prior art, the graphic equalizer enables the signal amplitude to be over large and accordingly sound is indistinct when specific gain is set.
Description
technical field [0001] The invention relates to the field of digital graphic processing, in particular to a volume adjustment method and device for a digital graphic equalizer. Background technique [0002] Digital graphic equalizer (digital graphic equalizer) is widely used in various playback software and portable players. Digital graphic equalizers achieve various auditory effects by enhancing or attenuating signal components in specific frequency bands. Typically, enhancing low-frequency signals while attenuating high-frequency signals will bring about a super-bass auditory effect. [0003] A basic composition of a digital graphic equalizer is as follows figure 1 As shown, the digital graphic equalizer uses N band-pass filters with the center frequency and bandwidth as the set value to filter the input digital audio signal x[n], and obtains a band-pass with N frequency components concentrated near the set center frequency audio signal bg i [n] (i=1~N). For the N band...
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IPC IPC(8): H03G3/02
Inventor 邓昊
Owner WUXI ZGMICRO ELECTRONICS CO LTD