Курсы английского
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Wow & Flutter problem
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METHODS FOR DETECTION AND REMOVAL OF PARASITIC FREQUENCY MODULATION IN AUDIO RECORDINGS

содержание презентации «METHODS FOR DETECTION AND REMOVAL OF PARASITIC FREQUENCY MODULATION IN AUDIO RECORDINGS.ppt»
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1METHODS FOR DETECTION AND REMOVAL OF 8variation defects based on comparison of
PARASITIC FREQUENCY MODULATION IN AUDIO the multiple copies of degraded audio.
RECORDINGS. Multimedia Systems Department time warping algorithms applied in time or
Gda?sk University of Technology (GUT) spectral domain (appropriate algorithm
Poland. CZYZEWSKI A., MAZIEWSKI P., should generate the correct time warping
DZIUBINSKI M., KACZMAREK A., KULESZA M., function or pitch variation function).
CIARKOWSKI A. & KOSTEK B. adaptive filtering (estimation of time
2Schedule. Wow & flutter – basic delay (offset) between selected copies).
facts and definitions Methods of correlation methods (finding similarities
estimating parasitic frequency modulation based on cross-correlation function).
in audio Our algorithms and software Sound statistical methods (maximum likelihood
examples Conclusions. estimation or true Bayesian estimation –
3Wow & flutter – parasite effects. depending on knowing the priori
The wow & flutter defects can be found information).
in: Recordings, especially archival on 9Methods of the restoration of pitch
magnetic and optical sound tapes Those variation defects based on one copy of the
defects can occur during: sound recording archive recording. speech applications –
copying procedure The main sources of lowpass filtering followed by pattern
those defects are: irregular velocity of matching. speech - cepstral analysis which
the sound carrier movement mechanical tape reveals information about the fundamental
damages Parasite wow (flutter) distortions frequency. music or speech - application
can be characterised as an undesirable of methods based on a knowledge of the
changes of all sound frequency components shape of the nonlinear function of audio
Eliminating them should help to understand distortion. PVC = Pitch Variation Curve.
the content of some still unresolved 10Methods of the restoration of pitch
archival speech recordings. variation defects based on one copy of the
4Wow & Flutter problem. Drift fmod archive recording. multiple pitch tracking
< 0.5Hz Wow fmod ? < 0.5 – 6Hz > based on : McAulay and Quatieri
Flutter fmod ? < 6Hz – 100Hz > representation (pitch tracking through the
Frequency-modulation noise fmod > use of multiple concurrent pitch “tracks”)
100Hz. Analyzing high-frequency bias Analyzing
5Standards related with wow & recorded power-line hum (AC power supply)
flutter. Examples of well known standards pitch tracking algorithms should generate
: Magnetic Tape Recording and Reproducing the correct pitch variation function (PVC)
(Reel-to-Reel) NAB Standard 1965 (National based on pitch variation the restoration
Association of Broadcasters) Messgerate of the signal can be done for example by
fur Frequenzschwankungen bei resampling it with a truncated sinc
Schallspeichergeraten (Measuring Equipment function.
for Frequency Variations in Sound 11Our algorithms… presto8.exe (7).
Recording Equipment) DIN 1966 Measurement 12Carrier feature analysis. Tracking
of Wow and Flutter in Recording Equipment power-line hum frequency Hum is commonly
and in Sound Reproduction CCIR found in archival recordings. Tracking its
Recommendation 1970 Method for Measurement frequency allows estimating the depth of
of Weighted Peak Flutter of Sound wow effect. Due to limitations of DFT
Recording and Reproducing Equipment IEEE methods in case of low-frequency signals,
1953 (1971) AES 1982 (2003). It is the AR pseudospectrum estimation method is
generally accepted that flutter should be used. Tracking high-frequency bias
less than 0.15% DIN weighted to be Assuming that a high frequency bias was
inaudible. Measurement methods (2) are recorded on the magnetic tape it could
described in IEC 386, and a suitable test serve as an ideal target for parasite wow
film is available from the SMPTE (No. characteristic determining. This idea was
P35-FL). also exploited in the prepared software.
6Wow Restoration algorithms. The defect 13Wow Restoration Plugin. No Wow. O R I
is difficult to estimate and to restore We G I N A L. R E S T O R E D. Wow.
developed several algorithms for wow 14Conclusions. MQ analysis can be
restoration. effective in case of parasite frequency
7PrestoSpace partnership. Preservation modulation detection Formant structure
towards storage and access. Standardised analysis can significantly improve
Practices for Audiovisual Contents in efficiency of the detection process
Europe FP6-IST-707336. Coordinator : INA Precise wow tracking can be achieved based
Project Steering Board : BBC, RAI, INA, on a cepstrally smoothed spectrum
ORF, Joanneum Research (Austria), B&G representation Recorded power line hum
(NL), Sheffield University (GB) Partners : provides a good basis for wow tracking
CTM Debrie, ACS, Media-Matters, CRCDG, (similarly to high-frequency bias in
Centrimage, Vectracom, SWR, Front Porch magnetic recordings) Interactive
Digital, Hi-STor, Houpert Digital Audio, procedures (parameters adjustment) leads
LIMSI-CNRS, Snell&Wilcox, TI Partners, to more reliable results It seems that an
Universities… Three partners to be interactive approach employing an
identified in second phase of the project algorithmic „toolbox” for wow&flutter
External User Group : 30+ considered restoration is the best solution of this
archives. problem.
8Methods of the restoration of pitch 15
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