Microphone and corresponding digital interface
First Claim
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1. A method in a microphone apparatus, the method comprising:
- producing an analog signal using a microelectromechanical system (MEMS) transducer;
converting the analog signal to digital data using an analog-to-digital converter;
determining whether acoustic activity exists within the digital data using an acoustic activity detector;
upon detecting acoustic activity, providing an indication of acoustic activity at an external-device interface of the microphone apparatus, the external-device interface standardized for compatibility with a plurality of devices from different manufacturers;
before detecting acoustic activity, operating the microphone apparatus in a first mode while determining whether acoustic activity exists within the digital data by clocking at least a portion of the microphone apparatus with an internal clock signal based on a local oscillator; and
after detecting acoustic activity, operating the microphone apparatus in a second mode using an external clock signal received at the external-device interface.
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Abstract
A microphone apparatus including a MEMS transducer, an acoustic activity detector, a local oscillator, and an external-device interface standardized for compatibility with devices from different manufacturers is disclosed. The microphone apparatus has a first mode of operation during which the apparatus is clocked by the internal clock signal when the acoustic activity detector processes digital data for acoustic activity, and a second mode of operation during which the microphone apparatus is clocked by an external clock signal received at the external-device interface after voice activity is detected by the acoustic activity detector.
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Citations
25 Claims
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1. A method in a microphone apparatus, the method comprising:
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producing an analog signal using a microelectromechanical system (MEMS) transducer; converting the analog signal to digital data using an analog-to-digital converter; determining whether acoustic activity exists within the digital data using an acoustic activity detector; upon detecting acoustic activity, providing an indication of acoustic activity at an external-device interface of the microphone apparatus, the external-device interface standardized for compatibility with a plurality of devices from different manufacturers; before detecting acoustic activity, operating the microphone apparatus in a first mode while determining whether acoustic activity exists within the digital data by clocking at least a portion of the microphone apparatus with an internal clock signal based on a local oscillator; and after detecting acoustic activity, operating the microphone apparatus in a second mode using an external clock signal received at the external-device interface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A microphone apparatus comprising:
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a microelectromechanical system (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 to digital data; and an acoustic activity detector configured to determine presence of acoustic activity by performing acoustic activity detection on the digital data; before acoustic activity is detected, the microphone apparatus is configured to operate in a first mode by performing acoustic activity detection using an internal clock signal generated from a local oscillator of the microphone apparatus; and after acoustic activity is detected, the microphone apparatus is configured to operate in a second mode using an external clock signal received at an external-device interface of the microphone apparatus; wherein the external-device interface is standardized for compatibility with devices from different manufacturers. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A microphone apparatus comprising:
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a microelectromechanical system (MEMS) transducer configured to generate an analog signal in response to an acoustic input; an analog-to-digital converter coupled to the MEMS transducer, the analog-to-digital converter configured to generate digital data representative of the analog signal; an acoustic activity detector coupled to the analog-to-digital converter; a controller coupled to the analog-to-digital converter; a local oscillator configured to generate an internal clock signal; and an external-device interface standardized for compatibility with devices from different manufacturers, the external-device interface coupled to the controller; the microphone apparatus having a first mode of operation during which the microphone apparatus is clocked by the internal clock signal while the acoustic activity detector processes the digital data for acoustic activity; and the microphone apparatus having a second mode of operation during which the microphone apparatus is clocked by an external clock signal received at the external-device interface after acoustic activity is detected by the acoustic activity detector. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification