Patent ID: 8666219

Claim:
An interface cable assembly, which enables a user of a smartphone to record both incoming and outgoing telephone conversations on a dual channel audio recorder in either WMA or MP3 format, said interface cable assembly comprising: a four-conductor plug that engages an audio input/output jack of the smartphone; a three-conductor plug that engages a dual-channel input jack of the audio recorder, said three-conductor plug coupled to said four-conductor plug via a first length of cable; and a four-conductor jack that engages a plug of a standard earphone/microphone assembly, said four-conductor jack also coupled to said four-conductor plug via a second length of cable; wherein the coupling of said four-conductor plug to said three-conductor plug employs resistors and capacitors which provide an impedance match between input/output circuitry of the smartphone and input circuitry of the audio recorder.