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- Polyphase_quadrature_filter abstract "A polyphase quadrature filter, or PQF, is a filter bank which splits an input signal into a given number N (mostly a power of 2) of equidistant sub-bands. These sub-bands are subsampled by a factor of N, so they are critically sampled.This critical sampling introduces aliasing. Similar to the MDCT time domain alias cancellation the aliasing of polyphase quadrature filters is canceled by neighbouring sub-bands, i.e. signals are typically stored in two sub-bands.Note that signal in odd subbands is stored frequency inverted.PQF filters are used in MPEG-1 Audio Layer I and II, Musepack (which was based on MPEG-1 layer II), in MPEG-1 Layer III with anadditional MDCT, in MPEG-4 AAC-SSR for the 4 band PQF bank, in MPEG-4 V3 SBRfor the analysis of the upper spectral replicated band, and in DTS.PQF has an advantage over the very similar stacked quadrature mirror filter (QMF). Delay and computational effort are much lower.A PQF filter bank is constructed using a base filter, which is a low-passat fs/4N. This lowpass is modulated by N cosine functions and converted toN band-passes with a bandwidth of fs/2N.The base lowpass is typically a FIR filter with a length of 10*N ... 24*N taps.Note that it is also possible to build PQF filters using recursive IIR filters.".
- Polyphase_quadrature_filter wikiPageID "237147".
- Polyphase_quadrature_filter wikiPageRevisionID "538078125".
- Polyphase_quadrature_filter hasPhotoCollection Polyphase_quadrature_filter.
- Polyphase_quadrature_filter subject Category:Digital_signal_processing.
- Polyphase_quadrature_filter subject Category:Linear_filters.
- Polyphase_quadrature_filter type Artifact100021939.
- Polyphase_quadrature_filter type Device103183080.
- Polyphase_quadrature_filter type Filter103339643.
- Polyphase_quadrature_filter type Instrumentality103575240.
- Polyphase_quadrature_filter type LinearFilters.
- Polyphase_quadrature_filter type Object100002684.
- Polyphase_quadrature_filter type PhysicalEntity100001930.
- Polyphase_quadrature_filter type Whole100003553.
- Polyphase_quadrature_filter comment "A polyphase quadrature filter, or PQF, is a filter bank which splits an input signal into a given number N (mostly a power of 2) of equidistant sub-bands. These sub-bands are subsampled by a factor of N, so they are critically sampled.This critical sampling introduces aliasing. Similar to the MDCT time domain alias cancellation the aliasing of polyphase quadrature filters is canceled by neighbouring sub-bands, i.e.".
- Polyphase_quadrature_filter label "Polyphase quadrature filter".
- Polyphase_quadrature_filter sameAs m.01jfdp.
- Polyphase_quadrature_filter sameAs Q16254797.
- Polyphase_quadrature_filter sameAs Q16254797.
- Polyphase_quadrature_filter sameAs Polyphase_quadrature_filter.
- Polyphase_quadrature_filter wasDerivedFrom Polyphase_quadrature_filter?oldid=538078125.
- Polyphase_quadrature_filter isPrimaryTopicOf Polyphase_quadrature_filter.