Apparatus and method for determining the voltage level of an...

Details Apparatus and method for determining the voltage level of an... Apparatus and method for determining the voltage level of an...

2007-03-13

2009-12-15

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

C330S295000

Reexamination Certificate

active

07633340

ABSTRACT:
The present invention discloses an apparatus and a method for determining the voltage level of a first signal from a playback device having an interface in compliance with an industrial standard. According to the method, first receive the first signal by a signal receiving pin electrically coupled to a signal transmitting pin of the interface. Then output a first output voltage by processing the first signal by the combination of a first zener diode and a first transistor and a second output voltage by processing the first signal by the combination of a second zener diode and a second transistor. Thus the voltage level of the first signal can be determined according to the first output voltage and the second output voltage.

REFERENCES:
patent: 3673507 (1972-06-01), Prescott
patent: 4184125 (1980-01-01), Mullally
patent: 4590437 (1986-05-01), Butler et al.
patent: 7276968 (2007-10-01), Ozawa et al.

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