Microphone and corresponding digital interface
First Claim
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1. A method in a microphone, the method comprising:
- producing analog signals using a microelectromechanical system (MEMS) transducer of the microphone;
converting the analog signals into digital data using an analog-to-digital convertor of the microphone;
determining whether acoustic activity exists within the digital data using a voice activity detector of the microphone;
upon the detection of acoustic activity, providing an indication of acoustic activity at an external-device interface of the microphone, the external-device interface standardized for compatibility with a plurality of devices from different manufacturers;
before detecting voice activity, operating the microphone in a first mode by clocking at least a portion of the microphone with an internal clock signal based on a local oscillator of the microphone while determining whether acoustic activity exists; and
after detecting voice activity, operating the microphone in a second mode by providing output data, representing the analog signals, at the external-device interface, wherein the output data is not provided at the external-device interface in the first mode.
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Abstract
Analog signals are received from a sound transducer. The analog signals are converted into digitized data. A determination is made as to whether voice activity exists within the digitized signal. Upon the detection of voice activity, an indication of voice activity is sent to a processing device. The indication is sent across a standard interface, and the standard interface is configured to be compatible to be coupled with a plurality of devices from potentially different manufacturers.
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Citations
22 Claims
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1. A method in a microphone, the method comprising:
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producing analog signals using a microelectromechanical system (MEMS) transducer of the microphone; converting the analog signals into digital data using an analog-to-digital convertor of the microphone; determining whether acoustic activity exists within the digital data using a voice activity detector of the microphone; upon the detection of acoustic activity, providing an indication of acoustic activity at an external-device interface of the microphone, the external-device interface standardized for compatibility with a plurality of devices from different manufacturers; before detecting voice activity, operating the microphone in a first mode by clocking at least a portion of the microphone with an internal clock signal based on a local oscillator of the microphone while determining whether acoustic activity exists; and after detecting voice activity, operating the microphone in a second mode by providing output data, representing the analog signals, at the external-device interface, wherein the output data is not provided at the external-device interface in the first mode. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A microphone apparatus comprising:
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a MEMS transducer configured to produce an analog signal in response to acoustic input; an analog-to-digital converter coupled to the transducer and configured to convert the analog signal into digital data; and a voice activity detector configured to determine whether voice activity is present by performing voice activity detection on the digital data; wherein the microphone apparatus is configured to operate in a first mode before voice activity is detected by performing voice activity detection using an internal clock signal generated from a local oscillator of the microphone apparatus; and wherein the microphone apparatus is configured to operate in a second mode after voice activity is detected by providing output data, representing the analog signal, on an external-device interface of the microphone apparatus, the external-device interface standardized for compatibility with devices from different manufacturers, the external-device interface of the microphone apparatus devoid of the output data in the first mode. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A microphone apparatus comprising:
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a MEMS transducer having an output and configured to produce an analog signal in response to acoustic input at the MEMS transducer; an analog-to-digital converter coupled to the MEMS transducer output, the analog-to-digital converter configured to output digital data based on the analog signal from the MEMS transducer; a voice activity detector coupled to the output of the analog-to-digital converter; a controller having an input and an output, the input of the controller coupled to the output of the analog-to-digital converter, a local oscillator; an external-device interface standardized for compatibility with devices from different manufacturers, the external-device interface coupled to the controller output, the microphone apparatus having a first mode of operation before voice activity is detected, at least a portion of the microphone clocked by an internal clock signal of the local oscillator during voice activity detection in the first mode of operation, the microphone apparatus having a second mode of operation after voice activity is detected, the controller output coupled to the external-device interface, wherein the controller is configured to provide output data, representing the analog signal, at the external-device interface during the second mode of operation but not during the first mode of operation. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification