Interface for microphone-to-microphone communications
First Claim
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1. A microphone comprising:
- a housing formed by a cover and a substrate, the housing having an acoustic port;
an external device interface;
a transducer disposed in the housing and configured to provide an analog signal in response to changes in acoustic energy sensed via the acoustic port;
an electrical circuit disposed in the housing, the electrical circuit including a converter configured to convert the analog signal to first pulse density modulation (PDM) data,the electrical circuit including a decimator configured to decimates and combine the first PDM data and second PDM data into combined pulse code modulation (PCM) data, wherein the second PDM data is received via the external device interface and is commonly clocked with the first PDM data,the electrical circuit including an interpolator configured to convert the combined PCM data to combined PDM data,wherein the combined PDM data may be output at the external device interface of the microphone.
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Abstract
A microphone system includes a first transducer deployed at a first microphone; a second transducer deployed at a second microphone, the first microphone being physically distinct from the second microphone; a decimator deployed at the second microphone that receives first pulse density modulation (PDM) data from the first transducer and second PDM data from the second transducer and decimates and combines the first PDM data and the second PDM data into combined pulse code modulation (PCM) data; and an interpolator deployed at the second microphone for converting the combined PCM data to combined PDM data, and transmits the combined PDM data to an external processing device.
72 Citations
19 Claims
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1. A microphone comprising:
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a housing formed by a cover and a substrate, the housing having an acoustic port; an external device interface; a transducer disposed in the housing and configured to provide an analog signal in response to changes in acoustic energy sensed via the acoustic port; an electrical circuit disposed in the housing, the electrical circuit including a converter configured to convert the analog signal to first pulse density modulation (PDM) data, the electrical circuit including a decimator configured to decimates and combine the first PDM data and second PDM data into combined pulse code modulation (PCM) data, wherein the second PDM data is received via the external device interface and is commonly clocked with the first PDM data, the electrical circuit including an interpolator configured to convert the combined PCM data to combined PDM data, wherein the combined PDM data may be output at the external device interface of the microphone. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A microphone comprising:
a housing; a transducer disposed in the housing; a decimator disposed in the housing, the decimator configured to decimate and combine first pulse density modulation (PDM) data and second PDM data into combined pulse code modulation (PCM) data, the first PDM data based on an analog signal from the transducer and the second PDM data received at an interface of the microphone wherein the first PDM data and the second PDM data are clocked by a common clock signal; an interpolator disposed in the housing, the interpolator configured to convert the combined PCM data to combined PDM data; and a processor configured to process the combined PDM data. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method implemented in a microphone, the method comprising:
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transducing acoustic energy into an analog signal; converting the analog signal to first pulse density modulation (PDM) data; receiving second PDM data from another microphone via an interface of the microphone, wherein the first PDM data and the second PDM data are synchronized; decimating and combining the first PDM data and the second PDM data into combined pulse code modulation (PCM) data; converting the combined PCM data to combined PDM data; transmitting the combined PDM data to an external processing device. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification