3 research outputs found
Roundoff errors analysis in fixed-point allpass chain implementation
ΠΠ΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΡ ΡΠ΅Π°Π»ΠΈΠ·Π°ΡΠΈΠΈ ΡΠ΅ΠΏΠΎΡΠΊΠΈ (ΠΊΠ°ΡΠΊΠ°Π΄Π°) ΡΠ°Π·ΠΎΠ²ΡΡ
, Π²ΡΠ΅ΠΏΡΠΎΠΏΡΡΠΊΠ°ΡΡΠΈΡ
Π·Π²Π΅Π½ΡΠ΅Π² Π²ΠΎΠ·Π½ΠΈΠΊΠ°Π΅Ρ ΠΏΡΠΈ ΠΏΠΎΡΡΡΠΎΠ΅Π½ΠΈΠΈ ΡΠΈΡΡΠ΅ΠΌ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠΈ Π·Π²ΡΠΊΠΎΠ²ΡΡ
ΡΠΈΠ³Π½Π°Π»ΠΎΠ² Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠ°Π·ΠΎΠ²ΠΎΠ³ΠΎ ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΡ. ΠΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ ΡΠ°Π·ΠΎΠ²ΠΎΠ³ΠΎ ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΠΏΠΎΠ»ΡΡΠ°ΡΡ Π΄ΠΈΡΠΊΡΠ΅ΡΠ½ΡΠ΅ ΡΠΈΡΡΠ΅ΠΌΡ, Π² ΠΊΠΎΡΠΎΡΡΡ
ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½ΠΈΠ΅ ΡΠΏΠ΅ΠΊΡΡΠ°Π»ΡΠ½ΠΎΠΉ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ ΠΏΡΠΈΠ±Π»ΠΈΠΆΠ΅Π½ΠΎ ΠΊ ΡΠΎΠΌΡ, ΠΊΠΎΡΠΎΡΠΎΠ΅ ΡΠΎΡΠΌΠΈΡΡΠ΅ΡΡΡ Π² ΡΡ
Π΅ ΡΠ΅Π»ΠΎΠ²Π΅ΠΊΠ°. Π¦Π΅Π»ΡΡ Π΄Π°Π½Π½ΠΎΠΉ ΡΠ°Π±ΠΎΡΡ ΡΠ²Π»ΡΠ»ΠΎΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΡΡΠΌΠΎΠ² ΠΊΠ²Π°Π½ΡΠΎΠ²Π°Π½ΠΈΡ Π²ΠΎΠ·Π½ΠΈΠΊΠ°ΡΡΠΈΡ
ΠΏΡΠΈ ΡΠ΅Π°Π»ΠΈΠ·Π°ΡΠΈΠΈ ΡΠ΅ΠΏΠΎΡΠΊΠΈ ΡΠ°Π·ΠΎΠ²ΡΡ
Π·Π²Π΅Π½ΡΠ΅Π² Π² Π°ΡΠΈΡΠΌΠ΅ΡΠΈΠΊΠ΅ Ρ ΡΠΈΠΊΡΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ Π·Π°ΠΏΡΡΠΎΠΉ. ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π»ΠΈΡΡ ΡΠ°Π·Π»ΠΈΡΠ½ΡΠ΅ ΡΡ
Π΅ΠΌΡ ΠΊΠ²Π°Π½ΡΠΎΠ²Π°Π½ΠΈΡ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ² Π°ΡΠΈΡΠΌΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΉ: ΡΡΠ΅ΡΠ΅Π½ΠΈΠ΅, Π΄Π΅ΡΠ΅ΡΠΌΠΈΠ½ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ΅ ΠΈ Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΠ½ΠΎΠ΅ ΠΎΠΊΡΡΠ³Π»Π΅Π½ΠΈΠ΅, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΌΠ΅ΡΠΎΠ΄ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΏΠ΅ΠΊΡΡΠ° ΠΎΡΠΈΠ±ΠΊΠΈ. ΠΠ½Π°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π»ΡΡ ΡΡΠΎΠ²Π΅Π½Ρ ΠΎΡΠΈΠ±ΠΎΠΊ ΠΎΠΊΡΡΠ³Π»Π΅Π½ΠΈΡ, Π²ΠΎΠ·Π½ΠΈΠΊΠ°ΡΡΠΈΡ
ΠΏΡΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠΈ Π΄Π°Π½Π½ΡΡ
ΡΠ°Π·Π»ΠΈΡΠ½ΠΎΠΉ ΡΠ°Π·ΡΡΠ΄Π½ΠΎΡΡΠΈ. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ Π½Π°ΠΈΠ»ΡΡΡΠΈΡ
ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ² ΡΠ΄Π°Π΅ΡΡΡ Π΄ΠΎΡΡΠΈΠ³Π½ΡΡΡ ΠΏΡΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠΈ ΠΌΠ΅ΡΠΎΠ΄Π° ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΏΠ΅ΠΊΡΡΠ° ΠΎΡΠΈΠ±ΠΊΠΈ, Π° Π½Π°ΠΈΡ
ΡΠ΄ΡΠΈΡ
ΠΏΡΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠΈ ΡΡΠ΅ΡΠ΅Π½ΠΈΡ
Low-delay nonuniform pseudo-QMF banks with application to speech enhancement
Journal ArticleAbstract-This paper presents a method for designing low-delay nonuniform pseudo quadrature mirror filter (QMF) banks. This method is motivated by the work of Li, Nguyen, and Tantaratana, in which the nonuniform filter bank is realized by combining an appropriate number of adjacent sub-bands of a uniform pseudo-QMF bank. In prior work, the prototype filter of the uniform pseudo-QMF bank was constrained to have linear phase and the overall delay associated with the filter bank was often unacceptably large for filter banks with a large number of sub-bands. This paper proposes a pseudo-QMF filter bank design technique that significantly reduces the delay by relaxing the linear phase constraints. An example in which an oversampled critical-band nonuniform filter bank is designed and applied to a two-state modeling speech enhancement system is presented in this paper. Comparison of the performance of this system to competing methods employing tree-structured, linear phase multiresolution analysis indicates that the approach described in this paper strikes a good balance between system performance and low delay