Packaged digital microphone device with auxiliary line-in function
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Accused Products
Abstract
A digital microphone device outputs a digital audio signal to a digital signal processing system. The digital microphone device includes an acoustic transducer for producing an analog voltage signal representative of an acoustic signal, and an integrated circuit including an input multiplexer. The input multiplexer has a first analog input coupled to an output of the acoustic transducer, and a second analog input to be connected to an output of a remote external analog microphone providing an analog voltage signal. A variable gain analog signal pre-amplifier is coupled to an output of the input multiplexer.
24 Citations
14 Claims
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1-2. -2. (canceled)
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3. A digital microphone device for outputting a digital audio signal to a digital signal processing system, and comprising:
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an acoustic transducer for providing a first analog voltage signal representative of an acoustic signal; and
an integrated circuit comprising an input multiplexer having a first analog input coupled to an output of said acoustic transducer, and at least one second analog input to be coupled to an output of a remote external analog microphone providing a second analog voltage signal, and a variable gain analog signal pre-amplifier coupled to an output of said input multiplexer. - View Dependent Claims (4, 5)
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6. A digital microphone device for outputting a digital audio signal to a digital signal processing system, and comprising:
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an acoustic transducer for providing a first analog voltage signal;
at least one discrete component to be connected to an output of a remote external analog microphone providing a analog voltage signal; and
an integrated circuit comprising an input multiplexer having a first analog input coupled to an output of said acoustic transducer for receiving the first analog voltage signal, and at least one second analog input coupled to said at least one discrete component for receiving the second analog voltage signal, and a variable gain analog signal pre-amplifier coupled to an output of said input multiplexer. - View Dependent Claims (7, 8)
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9. An electrical apparatus comprising:
- a digital microphone device comprising
an acoustic transducer for providing a first analog voltage signal, an integrated circuit comprising an input multiplexer having a first analog input coupled to an output of said acoustic transducer, and at least one second analog input to be connected to an output of a remote external analog microphone providing a second analog voltage signal, a variable gain analog signal pre-amplifier coupled to an output of said input multiplexer, and an analog-to-digital converter coupled to an output of said variable gain analog signal pre-amplifier, and having an output for providing a digital audio signal; and
a digital signal processor having an input for receiving the digital audio signal. - View Dependent Claims (10, 11)
- a digital microphone device comprising
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12. A method for outputting a digital audio signal to a digital signal processing system using a digital microphone device, the method comprising:
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producing a first analog voltage signal using an internal acoustic transducer;
producing a second analog voltage signal using an external acoustic transducer;
coupling the first analog voltage signal to a first input of an input multiplexer, and the second analog voltage signal to at least one second analog input of the input multiplexer; and
amplifying an output of the input multiplexer. - View Dependent Claims (13, 14)
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Specification