Digital signal processing apparatus and processing method,...

Electrical computers and digital data processing systems: input/ – Input/output data processing – Peripheral adapting

Reexamination Certificate

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C375S254000, C375S247000, C704S226000

Reexamination Certificate

active

06874045

ABSTRACT:
A digital signal processor receives 1-bit audio signals acquired by sigma modulation and sent over a predetermined transmission line and makes a changeover between the audio signal and a mute pattern includes an IEEE 1394 interface. The IEEE 1394 interface receives an isochronous packet sent over an IEEE 1394-formatted transmission line, extracts music data from the packet, supplies the music data to a DRAM, monitors the amount of data stored in the DRAM, reads a 1-bit digital signal or generates a mute pattern such as a 9-6 pattern, and makes a changeover between the 1-bit digital signal read from the DRAM and mute pattern while fading them. The digital signal processor further includes a D-A converter to convert the 1-bit digital signal supplied from the IEEE 1394 interface into an analog signal.

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patent: 5809454 (1998-09-01), Okada et al.
patent: 5889483 (1999-03-01), Tagami et al.
patent: 6628720 (2003-09-01), Sekii
patent: 20020025010 (2002-02-01), Yamazaki

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