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Time-base inversion type linear phase filter of the infinite impulse response type having linear phase characteristics
Time-base inversion type linear phase filter of the infinite impulse response type having linear phase characteristics
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机译：具有线性相位特性的无限脉冲响应型的时基反转型线性相位滤波器
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摘要
In a time-base inversion type linear phase filter, an input signal is time-base inverted, and thereafter delayed. The delayed signal is time- base inverted back to the original time sequence and then filtered by a first IIR filter. First and second selectors alternately select the time- base inverted signal and the delayed signal in opposite phases to each other. Output signals of the selectors are filtered by second and third IIR filters and then alternately selected by a third selector. An output of the third selector is time-base inverted back to the original time sequence and added to an output of the first IIR filter. A nonlinear emphasis/de-emphasis apparatus is constituted by using this linear phase filter.
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