Pulse or digital communications – Bandwidth reduction or expansion
Reexamination Certificate
2005-08-02
2005-08-02
Tran, Khai (Department: 2637)
Pulse or digital communications
Bandwidth reduction or expansion
C704S203000
Reexamination Certificate
active
06925116
ABSTRACT:
The present invention proposes a new method and apparatus for the enhancement of source coding systems. The invention employs bandwidth reduction (101) prior to or in the encoder (103), followed by spectral-band replication (105) at the decoder (107). This is accomplished by the use of new transposition methods, in combination with spectral envelope adjustments. Reduced bitrate at a given perceptual quality or an improved perceptual quality at a given bitrate is offered. The invention is preferably integrated in a hardware or software codec, but can also be implemented as a separate processor in combination with a codec. The invention offers substantial improvements practically independent of codec type and technological progress.
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Ekstrand Per Rune Albin
Henn Lars Fredrik
Kjorling Hans Magnus Kristofer
Liljeryd Lars Gustaf
Birch & Stewart Kolasch & Birch, LLP
Coding Technologies AB
Lugo David B.
Tran Khai
LandOfFree
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