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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 invention is how to reduce the duration of IIR filter output noise

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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

technical field [0001] The invention relates to the field of signal processing, in particular to an infinite impulse response filter and a control method thereof. Background technique [0002] The infinite impulse response (Infinite Impulse Response, IIR) filter can realize the amplitude-frequency response characteristics of the signal with a lower order, and has high economic efficiency, so it is widely used in signal processing. [0003] The impulse response of an IIR filter will theoretically last infinitely. The output of an IIR filter depends not only on the current and past input signal values, but also on past output signal values. When the input signal of the IIR filter is 0, the output signal keeps oscillating slightly for a long time, that is, the IIR filter outputs a noise signal for a long time. Contents of the invention [0004] The technical problem solved by the invention is how to reduce the duration of the IIR filter output noise. [0005] In order to s...

Claims

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Application Information

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IPC IPC(8): H03H17/04
CPCH03H17/04H03H2017/009
Inventor 姚炜吴绍夫张忠杜黎明
Owner SHANGHAI AWINIC TECH CO LTD
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