Digitizing an analog signal, and reconstituting an analog...

Details Digitizing an analog signal, and reconstituting an analog... Digitizing an analog signal, and reconstituting an analog...

2008-04-21

2010-02-09

Nguyen, Khai M (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S144000

Reexamination Certificate

active

07659843

ABSTRACT:
An embodiment of an audio-signal digitizer includes a modulator and a converter. The modulator is operable to receive an analog audio signal, and is operable to angle modulate a carrier signal with the analog audio signal to generate a modulated analog signal having an average amplitude. The converter is operable to convert the modulated analog signal into a digital signal having a first level in response to the modulated signal having an amplitude larger than approximately the average amplitude and having a second level in response to the modulated signal having an amplitude smaller than approximately the average amplitude. Because such a digitizer uses angle modulation to digitize an analog audio signal, the resulting digital audio signal may retain higher frequencies of the analog audio signal than a digital audio signal obtained by amplitude sampling would retain. And the retaining of higher frequencies may introduce less distortion into the reconstituted audio and acoustic signals.

REFERENCES:
patent: 5424735 (1995-06-01), Arkas et al.
patent: 6064328 (2000-05-01), Scheidig et al.
patent: 2003/0118199 (2003-06-01), Marquis et al.

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