Exercise System With Headphone Detection Circuitry

摘要

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.

主权项

1. A circuit arrangement, comprises:
a current sense circuit; an amplifier coupled to the current sense circuit; 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; and circuitry to convert the passed signal into a digital signal to provide an input signal to a controller to indicate the presence of a plug inserted into the receptacle.