Microphone Buffer Circuit With Input Filter
First Claim
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1. A buffer circuit comprising:
- a buffering portion, the buffering portion configured to receive a signal from a microphone;
an active resistor coupled to the buffering portion;
a control portion, the control portion coupled to the active resistor, the control portion being configured to selectively activate or deactivate the active resistor;
such that when the active resistor is activated, the active resistor and a capacitance of the microphone form a high pass filter, the high pass filter being effective to filter noise from the signal received from the microphone by the buffering portion.
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Abstract
A buffer circuit includes a buffering portion, an active resistor, and a control portion. The buffering portion is configured to receive a signal from a microphone. The active resistor is coupled to the buffering portion and the control portion is coupled to the active resistor. The control portion is configured to selectively activate or deactivate the active resistor. When the active resistor is activated, the active resistor and a capacitance of the microphone form a high pass filter. The high pass filter is effective to filter noise from the signal received from the microphone by the buffering portion.
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Citations
9 Claims
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1. A buffer circuit comprising:
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a buffering portion, the buffering portion configured to receive a signal from a microphone; an active resistor coupled to the buffering portion; a control portion, the control portion coupled to the active resistor, the control portion being configured to selectively activate or deactivate the active resistor; such that when the active resistor is activated, the active resistor and a capacitance of the microphone form a high pass filter, the high pass filter being effective to filter noise from the signal received from the microphone by the buffering portion. - View Dependent Claims (2, 3, 4, 5)
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6. An acoustic device, the acoustic device comprising:
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a microphone; a buffer circuit coupled to the microphone, the buffer circuit comprising; a buffering portion, the buffering portion configured to receive a signal from the microphone; an active resistor coupled to the buffering portion; a control portion, the control portion coupled to the active resistor, the control portion being configured to selectively activate or deactivate the active resistor; such that when the active resistor is activated, the active resistor and a capacitance of the microphone form a high pass filter, the high pass filter being effective to filter noise from the signal received from the microphone by the buffering portion and provide a noise-reduced signal. - View Dependent Claims (7, 8, 9)
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Specification