Digital signal processing device, a method and a delta-sigma...

Details Digital signal processing device, a method and a delta-sigma... Digital signal processing device, a method and a delta-sigma...

2005-03-21

2008-11-11

Phu, Phuong (Department: 2611)

Pulse or digital communications

Pulse code modulation

Differential

C375S340000, C375S252000, C341S143000, C341S155000

Reexamination Certificate

active

07450648

ABSTRACT:
A signal processing device uses a ΔΣ modulator having varying effective orders to ensure an S/N ratio by selecting a high order when a 1-bit music signal is output via the ΔΣ modulator. The signal processing device prevents noise during switchover by shifting to a low order just before the ΔΣ modulator is bypassed if this occurs. The present invention provides a digital signal processing device which can switch between an original sound signal and a ΔΣ modulation signal and yield a sufficient S/N ratio for a reprocessed ΔΣ modulation signal. If any 1-bit original sound signal is input, little switching noise is generated.

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