Infinite impulse response filter and control method thereof

A technology of infinite impulse response, control method, applied in the field of signal processing

Inactive Publication Date: 2017-03-22
SHANGHAI AWINIC TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem solved by the present inventi

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  • Infinite impulse response filter and control method thereof
  • Infinite impulse response filter and control method thereof
  • Infinite impulse response filter and control method thereof

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Embodiment Construction

[0021] It is known in the prior art that when the input signal of the IIR filter is 0, the output signal keeps oscillating slightly for a long time. refer to figure 1 , the impulse response curve of an existing IIR filter is given. figure 1 In , the time window 101 is intercepted from the time axis, and the time window 101 is enlarged to obtain the time window 101'. It can be known from the time window 101' that, for a long time after the input signal of the IIR filter becomes 0, the output signal of the IIR filter is still in an oscillating state and has not returned to zero.

[0022] Normally, since the oscillation amplitude of the output signal of the IIR filter is much smaller than that of the effective signal, it will not interfere with the output of the effective signal. However, in the field of audio signal processing, there may be a period of silence between two pieces of audio. At this time, although the input signal of the IIR filter is 0, the output signal of the...

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Abstract

The invention provides an infinite impulse response filter and a control method thereof. The control method comprises the steps that an input signal of the infinite impulse response filter is acquired and detected; when the input signal is 0, the input duration of the input signal is recorded; and when the input duration is greater than preset duration, numerical values stored in all shift registers in the infinite impulse response filter are cleared. According to the scheme, the output noise duration of the infinite impulse response filter can be reduced.

Description

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Claims

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Application Information

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Owner SHANGHAI AWINIC TECH CO LTD
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