Digital microphone

Details Digital microphone Digital microphone

2009-03-10

2011-12-13

Chambliss, Alonzo (Department: 2892)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Microphone capsule only

C381S179000, C381S369000

Reexamination Certificate

active

08077886

ABSTRACT:
A digital microphone comprises a ΔΣ modulator. The ΔΣ modulator has a resonator including a membrane which vibrates by receiving a sound wave and a wiring pattern disposed opposite to the membrane, an oscillator, including the resonator, for outputting an FM signal according to the vibration of the membrane, and a one-bit quantizer for outputting a one-bit quantized signal by sampling the FM signal with a high-frequency clock.

REFERENCES:
patent: 2004/0156520 (2004-08-01), Poulsen et al.
patent: 2009/0022341 (2009-01-01), Shams et al.
patent: 2005-519547 (2005-06-01), None
Mats Hovin, et al., “Delta-Sigma Modulators Using Frequency-Modulated Intermediate Values”, Jan. 1, 1997, IEEE Journal of Solid-State Circuits, vol. 32, No. 1, pp. 13-22.
Dag T. Wisland, et al., “A Novel Multi-Bit Parallel ΔΣ FM-to-Digital Converter with 24-bit Resolution”, 2002, ESSCIRC 2002, pp. 687-690.

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