Dual use of an integrated circuit pin and the switching of...

Details Dual use of an integrated circuit pin and the switching of... Dual use of an integrated circuit pin and the switching of...

2006-10-17

2006-10-17

Mei, Xu (Department: 2644)

Electrical audio signal processing systems and devices

Including amplitude or volume control

C381S120000, C381S123000, C381S107000, C327S099000, C327S334000, C307S098000, C307S099000

Reexamination Certificate

active

07123729

ABSTRACT:
In a signal processing system with an IC having an intrinsic signal provided at a pin of the IC, a first operational function (de-emphasis) for the signal is provided at the pin, and further along in the signal flow path, a second operational function (variable attenuation) for the signal is provided within the IC. An extrinsic signal is switchably coupled to the pin so that the second operational function can be used to operate on the extrinsic signal. The second signal is coupled to the pin at a low source impedance so that when the second signal is switched to be operational, the first operational function is defeated, and the first signal is severely attenuated. When the circuit is switched to not couple the second signal to the pin, the coupling path for the second signal and the low source impedance are both removed, thus restoring the first operational function and the first signal at the pin of the IC.

REFERENCES:
patent: 4173769 (1979-11-01), van Straaten
patent: 4293870 (1981-10-01), Steckler et al.
patent: 4434474 (1984-02-01), Best et al.
patent: 4675550 (1987-06-01), Hafner
patent: 5045733 (1991-09-01), Sendelweck
patent: 5557236 (1996-09-01), Monti
patent: 5594442 (1997-01-01), Paulos et al.

Affiliated with

Also associated with

Rating

Dual use of an integrated circuit pin and the switching of... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dual use of an integrated circuit pin and the switching of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual use of an integrated circuit pin and the switching of... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3663772