Data processing: generic control systems or specific application – Specific application – apparatus or process – Digital audio data processing system
Reexamination Certificate
2005-02-08
2005-02-08
Mei, Xu (Department: 2644)
Data processing: generic control systems or specific application
Specific application, apparatus or process
Digital audio data processing system
C381S017000, C381S018000, C381S061000, C381S001000
Reexamination Certificate
active
06853869
ABSTRACT:
A surround-sound circuit has a delay time memory (31) for storing a digital audio input signal IN, and outputs the stored input signal as a surround-sound signal a predetermined time later. The input signal is compressed by a compressor (32) in the form of ADPCM encoder before it is stored in the memory (31), and the compressed signal retrieved from the memory is expanded by an expander (33) in the form of ADPCM decoder before it is added to the input signal. The invention may reduce appreciably the amount of data to be stored in the memory, and hence the storage capacity of the RAM, without directly loping the audio input signal IN and hence avoiding appreciable deterioration of the signal IN.
REFERENCES:
patent: 5228059 (1993-07-01), Takegahara et al.
patent: 5394474 (1995-02-01), Hirai et al.
patent: 6304714 (2001-10-01), Krause et al.
patent: 6311092 (2001-10-01), Yamada
patent: 6665409 (2003-12-01), Rao
patent: 04339500 (1992-11-01), None
Hogan & Hartson LLP
Mei Xu
Michalski Justin
Rohm & Co., Ltd.
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