Microphone system
AssigneeAlpha Holdings, Inc.
InventorYoung Chul Park
Life of this patent
Estimating the term…
Abstract
Provided is a microphone system insensitive to external noise, and the microphone system includes a microphone sensor that generates sensing data by sensing a change in sound pressure through a sensor bias voltage, a lead-out circuit that provides the sensor bias voltage for operating the microphone sensor, removes noise of the sensing data, and outputs the sensing data, a first pad that connects the microphone sensor and the lead-out circuit to each other and allows the sensor bias voltage to pass therethrough, and a second pad that connects the microphone sensor and the lead-out circuit to each other and allows the sensing data to pass therethrough.
Claims15
A microphone system comprising:
- a microphone sensor configured to generate sensing data by sensing a change in sound pressure through a sensor bias voltage;
- a read-out circuit configured to provide the sensor bias voltage for operating the microphone sensor, and receive and output the sensing data;
- a first pad configured to connect the microphone sensor and the read-out circuit to each other and allow the sensor bias voltage to pass therethrough;
- and
- a second pad configured to connect the microphone sensor and the read-out circuit to each other and allow the sensing data to pass therethrough,
- wherein the read-out circuit comprises:
- a first filter unit configured to filter the sensor bias voltage and filter first noise introduced from the first pad;
- a second filter unit configured to filter second noise introduced from the second pad;
- and
- a voltage buffer configured to amplify the sensing data and discharge the first noise or the second noise;
- wherein the read-out circuit further comprises:
- a first bias generator configured to generate the sensor bias voltage by amplifying a reference voltage;
- and
- a second bias generator configured to provide the voltage buffer with a buffer bias voltage by using a reference current, and
- wherein the first filter unit comprises:
- a first filter including a resistor or a capacitor in which one end is connected to an output terminal of the voltage buffer and the second filter unit and the other end is connected to the first pad;
- and
- a low pass filter configured to be connected between the other end of the first filter and the first bias generator.
A microphone system comprising:
- a microphone sensor configured to generate sensing data by sensing a change in sound pressure through a sensor bias voltage;
- a read-out circuit configured to provide the sensor bias voltage for operating the microphone sensor, and receive and output the sensing data;
- a first pad configured to connect the microphone sensor and the read-out circuit to each other and allow the sensor bias voltage to pass therethrough;
- and
- a second pad configured to connect the microphone sensor and the read-out circuit to each other and allow the sensing data to pass therethrough,
- wherein the read-out circuit comprises:
- a separation buffer configured to separate a voltage environment of the first pad and the second pad;
- a first filter unit configured to filter the sensor bias voltage and filter first noise introduced from the first pad;
- a second filter unit configured to filter second noise introduced from the second pad;
- and
- a voltage buffer configured to amplify the sensing data;
- wherein the separation buffer discharges the filtered first noise, and the voltage buffer discharges the filtered second noise.
Dependencies are inferred from the claim text.