Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker
Reexamination Certificate
2005-02-08
2005-02-08
Mei, Xu (Department: 2644)
Electrical audio signal processing systems and devices
Circuitry combined with specific type microphone or loudspeaker
C381S113000, C381S122000
Reexamination Certificate
active
06853733
ABSTRACT:
A two-wire interface for a digital microphone circuit includes a power line and a ground line. The interface utilizes the ground line as a “voltage active line” to transmit both clock and data signals between the digital microphone circuit and a receiving circuit. The digital microphone circuit detects the clock signal on the voltage active line and uses the detected clock signal to operate an ADC to provide digital data. The digital data is used to selectively drive current back to the receiving circuit over the voltage active line. The receiving circuit detects the transmitted data by monitoring the voltage associated with a line termination. The impedance associated with the line termination is switched by the receiver circuit to modulate the clock signal on the voltage active line.
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Eschauzier Rudolphe Gustave Hubertus
Groothedde Wouter
Klumperink Eric Antonius Maria
Nauta Bram
van Rijn Nico
Grier Laura A.
Mei Xu
Merchant & Gould P,C,
National Semiconductor Corporation
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