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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 wikiPageLength "2061".
- Polyphase_quadrature_filter wikiPageOutDegree "25".
- Polyphase_quadrature_filter wikiPageRevisionID "538078125".
- Polyphase_quadrature_filter wikiPageWikiLink Aliasing.
- Polyphase_quadrature_filter wikiPageWikiLink Band-pass_filter.
- Polyphase_quadrature_filter wikiPageWikiLink Bandwidth_(signal_processing).
- Polyphase_quadrature_filter wikiPageWikiLink Category:Digital_signal_processing.
- Polyphase_quadrature_filter wikiPageWikiLink Category:Linear_filters.
- Polyphase_quadrature_filter wikiPageWikiLink Cosine.
- Polyphase_quadrature_filter wikiPageWikiLink DTS_(sound_system).
- Polyphase_quadrature_filter wikiPageWikiLink Digital_Theatre_System.
- Polyphase_quadrature_filter wikiPageWikiLink Filter_bank.
- Polyphase_quadrature_filter wikiPageWikiLink Finite_impulse_response.
- Polyphase_quadrature_filter wikiPageWikiLink Frequency_inverted.
- Polyphase_quadrature_filter wikiPageWikiLink Infinite_impulse_response.
- Polyphase_quadrature_filter wikiPageWikiLink Low-pass_filter.
- Polyphase_quadrature_filter wikiPageWikiLink MP3.
- Polyphase_quadrature_filter wikiPageWikiLink MPEG-1_Audio_Layer_I.
- Polyphase_quadrature_filter wikiPageWikiLink MPEG-1_Audio_Layer_II.
- Polyphase_quadrature_filter wikiPageWikiLink MPEG-4_AAC-SSR.
- Polyphase_quadrature_filter wikiPageWikiLink MPEG-4_Part_3.
- Polyphase_quadrature_filter wikiPageWikiLink Modified_discrete_cosine_transform.
- Polyphase_quadrature_filter wikiPageWikiLink Musepack.
- Polyphase_quadrature_filter wikiPageWikiLink Propagation_delay.
- Polyphase_quadrature_filter wikiPageWikiLink Quadrature_mirror_filter.
- Polyphase_quadrature_filter wikiPageWikiLink Sample_(signal).
- Polyphase_quadrature_filter wikiPageWikiLink Sampling_(signal_processing).
- Polyphase_quadrature_filter wikiPageWikiLink Spectral_Band_Replication.
- Polyphase_quadrature_filter wikiPageWikiLink Spectral_band_replication.
- Polyphase_quadrature_filter wikiPageWikiLink Sub-band.
- Polyphase_quadrature_filter wikiPageWikiLink Time_domain_alias_cancellation.
- Polyphase_quadrature_filter wikiPageWikiLink Trigonometric_functions.
- Polyphase_quadrature_filter wikiPageWikiLinkText "Polyphase quadrature filter".
- Polyphase_quadrature_filter wikiPageWikiLinkText "polyphase quadrature filter".
- Polyphase_quadrature_filter wikiPageWikiLinkText "polyphased".
- Polyphase_quadrature_filter hasPhotoCollection Polyphase_quadrature_filter.
- Polyphase_quadrature_filter wikiPageUsesTemplate Template:Cleanup.
- Polyphase_quadrature_filter wikiPageUsesTemplate Template:Signal-processing-stub.
- Polyphase_quadrature_filter wikiPageUsesTemplate Template:Unreferenced.
- Polyphase_quadrature_filter subject Category:Digital_signal_processing.
- Polyphase_quadrature_filter subject Category:Linear_filters.
- Polyphase_quadrature_filter hypernym Bank.
- Polyphase_quadrature_filter type Article.
- Polyphase_quadrature_filter type Bank.
- Polyphase_quadrature_filter type Algorithm.
- Polyphase_quadrature_filter type Article.
- Polyphase_quadrature_filter type Filter.
- Polyphase_quadrature_filter type Page.
- 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 wasDerivedFrom Polyphase_quadrature_filter?oldid=538078125.
- Polyphase_quadrature_filter isPrimaryTopicOf Polyphase_quadrature_filter.