Apparatus and method for frequency detection
First Claim
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1. A microphone assembly comprising:
- an electro-acoustic transducer;
an integrated circuit (IC) coupled to the electro-acoustic transducer, the IC comprising;
an oscillator configured to generate an internal clock signal;
at least one operational block; and
a frequency detection block configured to;
receive, from a device external to the microphone assembly, an external clock signal; and
determine a frequency of the external clock signal, the frequency indicative of one of a plurality of operational modes of the IC;
the microphone assembly configured to operate in a first mode of operation based on a first frequency of the external clock signal, and the microphone assembly configured to operate in a second mode of operation based on a second frequency of the external clock signal.
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Abstract
An application specific integrated circuit (ASIC) is used with an acoustic device. An input clock signal is received. The frequency of the input clock signal is determined, and the frequency is indicative of one of a plurality of operational modes of the ASIC. Based upon the determined frequency, an amount current provided to one or more operational blocks of the ASIC is changed.
109 Citations
18 Claims
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1. A microphone assembly comprising:
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an electro-acoustic transducer; an integrated circuit (IC) coupled to the electro-acoustic transducer, the IC comprising; an oscillator configured to generate an internal clock signal; at least one operational block; and a frequency detection block configured to; receive, from a device external to the microphone assembly, an external clock signal; and determine a frequency of the external clock signal, the frequency indicative of one of a plurality of operational modes of the IC; the microphone assembly configured to operate in a first mode of operation based on a first frequency of the external clock signal, and the microphone assembly configured to operate in a second mode of operation based on a second frequency of the external clock signal. - View Dependent Claims (2, 3, 4, 5, 10, 11, 12, 13, 14, 15, 18)
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6. A method of operating a microphone assembly that comprises an electro-acoustic transducer and an integrated circuit (IC) having an oscillator configured to generate an internal clock signal, the method comprising:
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receiving, from a device external to the microphone assembly, an external clock signal; determining a frequency of the external clock signal, the frequency indicative of one of a plurality of operational modes of the IC; based upon the determined frequency, determining an amount of current provided to one or more operational blocks of the IC; and operating the microphone assembly in one of the plurality of operational modes based on the frequency of the external clock signal by applying the determined amount of current to the one or more operational blocks. - View Dependent Claims (7, 8, 9, 16, 17)
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Specification