Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1994-11-10
2000-05-23
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704229, 704230, G10L 704
Patent
active
RE0367141
ABSTRACT:
A method is disclosed for determining estimates of the perceived noise masking level of audio signals as a function of frequency. By developing a randomness metric related to the euclidian distance between (i) actual frequency components amplitude and phase for each block of sampled values of the signal and (ii) predicted values for these components based on values in prior blocks, it is possible to form a tonality index which provides more detailed information useful in forming the noise masking function. Application of these techniques is illustrated in a coding and decoding context for audio recording or transmission. The noise spectrum is shaped based on a noise threshold and a tonality measure for each critical frequency-band (bark).
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Brandenburg Karlheinz
Johnston James David
Hudspeth David R.
Lucent Technologies - Inc.
Smits Talivaldis Ivars
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