Exercise system with headphone detection circuitry
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United States of America Patent
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Dec 20, 2016
Grant Date -
Apr 7, 2016
app pub date -
Oct 1, 2014
filing date -
Oct 1, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
Described is a circuit arrangement for detection of a tone whose presence indicates insertion of a headphone plug into a jack. The circuit includes a receptacle having contacts configured to receive a plug inserted into the receptacle, a current sense circuit, an amplifier coupled to the current sense circuit and a band pass filter coupled to an output of the amplifier, the band pass filter configured to pass a signal having a frequency in a range of about 2 Hz to 20 Hz. Circuitry converts the passed signal into a digital signal to provide an input signal to a controller to indicate that a headphone plug was inserted into the receptacle.
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