Method and system for PCM audio ramp and decay function

Details Method and system for PCM audio ramp and decay function Method and system for PCM audio ramp and decay function

2008-06-24

2008-06-24

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Including amplitude or volume control

C381S107000, C700S094000

Reexamination Certificate

active

07391871

ABSTRACT:
A method and system for pulse code modulation (PCM) audio ramp and decay function may comprise receiving at least one control signal which indicates whether to enable a ramp-up function or a decay function. When the ramp-up function is enabled, an audio input signal may be modified such that an input low to high transition may make a more gradual transition from low to high at the output, and when the decay function is enabled the audio input signal may be modified such that an input high to low transition may make a more gradual transition from high to low at the output. These functionalities may reduce unwanted noise generated when there is a sudden high to low transition, or a sudden low to high transition, in audio signals.

REFERENCES:
patent: 5825899 (1998-10-01), Yamaguchi et al.
patent: 6047073 (2000-04-01), Norris et al.
patent: 6535611 (2003-03-01), Lau
patent: 7088835 (2006-08-01), Norris et al.
patent: 2002/0126858 (2002-09-01), Yeum

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