VAD detection microphone and method of operating the same
First Claim
1. A microphone comprising:
- a microelectromechanical system (MEMS) circuit configured to convert a voice signal into an electrical signal,an integrated circuit coupled to the MEMS circuit, the integrated circuit including a voice activity detector that determines whether voice is present in data representative of the electrical signal;
the integrated circuit has a first mode of operation when the data is not provided to an external-device interface of the microphone and a second mode of operation when the data is provided to the external-device interface, the first mode of operation having a first power consumption and the second mode of operation having a second power consumption, the first power consumption being less than the second power consumption,the integrated circuit configured to provide an interrupt signal to the external-device interface after detection of voice activity in the data;
the integrated circuit includes a buffer in which the data representative of the electrical signal is buffered in order to provide time for the integrated circuit to process the data representative of the electrical signal;
wherein the integrated circuit selectively provides the buffered data to the external-device interface at an overclocked rate after detection of voice activity.
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Accused Products
Abstract
A microphone includes a microelectromechanical system (MEMS) circuit and an integrated circuit. The MEMS circuit is configured to convert a voice signal into an electrical signal, and the integrated circuit is coupled to the MEMS circuit and is configured to receive the electrical signal. The integrated circuit and the MEMS circuit receive a clock signal from an external host. The clock signal is effective to cause the MEMS circuit and integrated circuit to operate in full system operation mode during a first time period and in a voice activity mode of operation during a second time period. The voice activity mode has a first power consumption and the full system operation mode has a second power consumption. The first power consumption is less than the second power consumption. The integrated circuit is configured to generate an interrupt upon the detection of voice activity, and send the interrupt to the host.
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Citations
19 Claims
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1. A microphone comprising:
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a microelectromechanical system (MEMS) circuit configured to convert a voice signal into an electrical signal, an integrated circuit coupled to the MEMS circuit, the integrated circuit including a voice activity detector that determines whether voice is present in data representative of the electrical signal; the integrated circuit has a first mode of operation when the data is not provided to an external-device interface of the microphone and a second mode of operation when the data is provided to the external-device interface, the first mode of operation having a first power consumption and the second mode of operation having a second power consumption, the first power consumption being less than the second power consumption, the integrated circuit configured to provide an interrupt signal to the external-device interface after detection of voice activity in the data; the integrated circuit includes a buffer in which the data representative of the electrical signal is buffered in order to provide time for the integrated circuit to process the data representative of the electrical signal; wherein the integrated circuit selectively provides the buffered data to the external-device interface at an overclocked rate after detection of voice activity. - View Dependent Claims (2, 3)
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4. A method in a microphone comprising an acoustic sensor packaged with an integrated circuit, the method comprising:
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performing voice activity detection on data obtained from an electrical signal produced in response to acoustic input to the microphone to detect voice activity; buffering the data while performing voice activity detection; clocking the microphone with an internal clock signal based on a local oscillator of the microphone; providing the buffered data at an external-device interface of the microphone after detection of the voice activity; and compensating for delay attributed to the buffering when providing the buffered data at the external-device interface of the microphone by providing the buffered data at the external-device interface at an overclocked frequency after detection of the voice activity. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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12. A microphone comprising:
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an acoustic sensor having an output with an electrical signal produced in response to acoustic input at the acoustic sensor; an integrated circuit packaged with the acoustic sensor, the integrated circuit including a controller coupled to a local oscillator, a voice activity detector, and a buffer, the integrated circuit clocked by an internal clock signal, the internal clock signal based on an output of the local oscillator, the output of the acoustic sensor coupled to the buffer and to the voice activity detector, data obtained from the electrical signal buffered at the buffer while the data is processed by the voice activity detector, the controller providing the buffered data at an external-device interface of the microphone after detection of voice activity, the buffered data at the external-device interface compensated for delay attributed to buffering, wherein the buffered data is provided at the external-device interface at an overclocked frequency. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification