Apparatus and method for intercepting input signal

A technology of input signal and output signal, applied in impedance network, digital technology network, electrical components, etc., can solve the problem of poor filter stopband minimum attenuation performance, can not better suppress "spectral leakage and other problems, achieve side lobe" Fast attenuation, small side lobe peak attenuation, and the effect of suppressing spectral leakage

Active Publication Date: 2010-02-10
HUAWEI TECH CO LTD +1
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Problems solved by technology

However, the peak attenuation of the side lobe of the Hamming window function is -41dB, which is not as good as -57dB of the Blackman window; the attenuation speed of the side lobe is -6dB / oct, which is not as good as -18dB / oct of the Hanning window and Blackman window
Therefore, when using the Hamming window function to intercept the ideal unit impulse response, the "spectrum leakage" cannot be better suppressed, resulting in poor minimum attenuation performance of the stop band of the filter designed using the Hamming window
Finally, the peak signal-to-noise ratio (PSNR, Peak Signal to Noise Ratio) of the audio signal obtained by the AMR-WB+ audio encoder designed with this filter is small

Method used

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  • Apparatus and method for intercepting input signal
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  • Apparatus and method for intercepting input signal

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Embodiment Construction

[0040] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] A method for intercepting an input signal provided by an embodiment of the present invention modifies the window function according to the even-sided exponential signal, and multiplies the input signal with the modified window function to obtain an output signal.

[0042] When using the window function to design a filter, the input signal is the ideal unit impulse response of the filter, and the output signal is the unit impulse response of the filter, and the filter input signal is convolved with the unit impulse response to obtain the filter output signal .

[0043]In practical applications, when using the window function to design a filter, the obtained unit impulse response can also be transformed from the time domain to the frequency domain to obtain the transfer function, and the frequency domain expression of the input signal of...

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Abstract

The invention discloses a method for cutting input signals, wherein the method comprises a modifying window function according to even bilateral index number signals, obtaining a modified window function, and multiplying the modified window function with the input signals to obtain output signals. The invention also discloses a device for cutting input signals, frequency spectrum leakage is betterinhibited through utilizing the invention when signals are cut, and minimum stopband rejection of a filter which utilizes design of the modified window function is reduced.

Description

technical field [0001] The invention relates to digital signal processing technology, in particular to a method and device for intercepting an input signal. Background technique [0002] Window functions are widely used in digital signal processing. For example, in actual digital signal processing, it is necessary to limit the observation time of the signal to a certain time interval, that is to say, only need to select the signal within a certain period of time for processing. analyze. In the process of using limited data, that is, intercepting a part of the signal data, the phenomenon that the spectrum components spread from the normal spectrum often occurs, which is the so-called "spectrum leakage". This is because, when truncating data, a discrete Fourier transform (DFT, Discrete Fourier Transform) needs to be performed. When performing DFT, truncation in the time domain is necessary, so the leakage effect is also inherent in DFT. In practical applications, this kind o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/02
Inventor 张涛张海郭利斌张德军
Owner HUAWEI TECH CO LTD
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