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US 8,077,886 B2Granted
Digital microphone
AssigneesKabushiki Kaisha Audio-Technica, National University Corporation University of Toyama
InventorsTetsuya Motobayashi, Koichi Maezawa
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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.
Claims9
A digital microphone, comprising:
- a ΔΣ modulator, wherein
- 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.
2 more elements
A digital microphone comprising:
- a ΔΣ modulator, wherein
- the ΔΣ modulator has
- a condenser constituted by a membrane which vibrates by receiving a sound wave, and an opposed electrode disposed opposite to the membrane,
- a resonator constituted by the condenser and an inductor connected to the condenser,
- 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.
3 more elements
A digital microphone, comprising:
- a ΔΣ modulator, wherein
- 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,
- a delay circuit for providing a different delay time according to an opposed position to the membrane,
- an oscillator, including the resonator, for outputting an FM signal according to the vibration of the membrane, and outputting a plurality of FM signals through the delay circuit, and
- a plurality of edge detectors for detecting edges of the respective FM signals;
- wherein
- the digital microphone outputs a plurality of parallel ΔΣ modulated signals.
5 more elements
Dependencies are inferred from the claim text.