Appeal No. 1999-0440
Application 08/813,706
system dealing with both sound and image data. More
particularly, the invention has a sound data output unit
including sound memories which only store sound data. This
sound data output unit is said to make instruction execution
by the CPU more efficient.
Sole pending claim 4 is reproduced as follows:
4. A computer system for processing image and sound
data, comprising:
a programmable sound generator (PSG) for generating
PSG sound data;
a volume control circuit for controlling pulse code
modulation (PCM) data transmitted from an external sound
source;
an adaptive difference PCM (ADPCM) decoder for
generating ADPCM sound data by compressing said PCM sound
data;
a sound data output unit having one or more sound
memories for storing only sound data generated by said PSG and
two channels of said ADPCM decoder, each of said two channels
using a 32kHz sampling frequency generated in accordance with
a horizontal synchronizing signal;
one or more main memories for storing image and
program data without said sound data;
a CPU of the 32 bits type connected with said main
memories, for processing said image and program data;
one or more image memories for storing said image
data; and
2
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