In signal processing, linear phase is a property of a filter where the phase response of the filter is a linear function of frequency. The result is that all frequency components of the input signal are shifted in time (usually delayed) by the same constant amount (the slope of the linear function), which is referred to as the group delay. Consequently, there is no phase distortion due to the time delay of frequencies relative to one another.
* a Bessel transfer function which has a maximally flat group delay approximation function
* a phase equalizer
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| - Filtre à phase linéaire (fr)
- Linear phase (en)
- Lineaire fase (nl)
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| - Un filtre à phase linéaire est un filtre dont la réponse en phase est linéaire (modulo ) par rapport à la fréquence. Le délai de groupe pour ce filtre est constant, ce qui signifie que les composantes fréquentielles se voient infligées un même délai - ce délai se réfère au retard de phase. Un système à réponse de phase linéaire ne connaît pas d'effet de distorsion de phase. (fr)
- Lineaire fase is een eigenschap die bij FIR-filters kan worden ingebouwd. Deze eigenschap houdt in dat de faserespons van zo'n filter een lineaire functie van de frequentie is. Concreet wil dit zeggen dat een faseverschil tussen twee sinuscomponenten met verschillende frequentie hetzelfde blijft nadat het signaal door het filter gepasseerd is. Deze eigenschap, die kan worden vertaald in voorwaarden op de filtercoëfficiënten, is bij een aantal toepassingen gewenst. Bij IIR-filters is lineaire fase niet mogelijk. (nl)
- In signal processing, linear phase is a property of a filter where the phase response of the filter is a linear function of frequency. The result is that all frequency components of the input signal are shifted in time (usually delayed) by the same constant amount (the slope of the linear function), which is referred to as the group delay. Consequently, there is no phase distortion due to the time delay of frequencies relative to one another.
* a Bessel transfer function which has a maximally flat group delay approximation function
* a phase equalizer (en)
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| - Phase discontinuities are removed by allowing negative amplitude. (en)
- Bode plots. Phase discontinuities are π radians, indicating a sign reversal. (en)
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| - Two depictions of the frequency response of a simple FIR filter (en)
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| - Amplitude & phase vs frequency for 3-term boxcar filter.svg (en)
- Frequency response of 3-term boxcar filter.svg (en)
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| - In signal processing, linear phase is a property of a filter where the phase response of the filter is a linear function of frequency. The result is that all frequency components of the input signal are shifted in time (usually delayed) by the same constant amount (the slope of the linear function), which is referred to as the group delay. Consequently, there is no phase distortion due to the time delay of frequencies relative to one another. For discrete-time signals, perfect linear phase is easily achieved with a finite impulse response (FIR) filter by having coefficients which are symmetric or anti-symmetric. Approximations can be achieved with infinite impulse response (IIR) designs, which are more computationally efficient. Several techniques are:
* a Bessel transfer function which has a maximally flat group delay approximation function
* a phase equalizer (en)
- Un filtre à phase linéaire est un filtre dont la réponse en phase est linéaire (modulo ) par rapport à la fréquence. Le délai de groupe pour ce filtre est constant, ce qui signifie que les composantes fréquentielles se voient infligées un même délai - ce délai se réfère au retard de phase. Un système à réponse de phase linéaire ne connaît pas d'effet de distorsion de phase. (fr)
- Lineaire fase is een eigenschap die bij FIR-filters kan worden ingebouwd. Deze eigenschap houdt in dat de faserespons van zo'n filter een lineaire functie van de frequentie is. Concreet wil dit zeggen dat een faseverschil tussen twee sinuscomponenten met verschillende frequentie hetzelfde blijft nadat het signaal door het filter gepasseerd is. Deze eigenschap, die kan worden vertaald in voorwaarden op de filtercoëfficiënten, is bij een aantal toepassingen gewenst. Bij IIR-filters is lineaire fase niet mogelijk. (nl)
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