Telephonic communications – Echo cancellation or suppression – Using digital signal processing
Reexamination Certificate
2006-06-13
2006-06-13
Swerdlow, Daniel (Department: 2646)
Telephonic communications
Echo cancellation or suppression
Using digital signal processing
C370S286000
Reexamination Certificate
active
07062039
ABSTRACT:
Adaptive filtering algorithm training signals incorporate adaptation-enhancing signals having properties, such as spectral whiteness and rapidly decaying auto-correlation between samples, which allow the adaptive filtering algorithms to converge more quickly as compared to conventional algorithms. Exemplary adaptation-enhancing signals are incorporated such that the training signals are not perceptibly altered as compared to conventional training signals. For example, in a hands-free telephony application, an adaptation-enhancing signal according to the invention is dynamically tailored so that it is masked by a loudspeaker signal (the conventional training signal) and is thus inaudible to hands-free telephone users.
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Potomac Patent Group PLLC
Swerdlow Daniel
Telefonaktiebolaget LM Ericsson
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