US 12,236,158 B2
Systems and methods for detection status of intercom termination
Victor Lerner, Carlsbad, CA (US); and Charles Butten, Richmond, CA (US)
Assigned to H.M. Electronics, Inc., Carlsbad, CA (US)
Filed by H.M. Electronics, Inc., Carlsbad, CA (US)
Filed on Oct. 19, 2023, as Appl. No. 18/490,532.
Application 18/490,532 is a continuation of application No. 18/343,527, filed on Jun. 28, 2023, granted, now 11,809,772.
Prior Publication US 2025/0004697 A1, Jan. 2, 2025
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 3/16 (2006.01)
CPC G06F 3/162 (2013.01) 20 Claims
OG exemplary drawing
 
1. A system configured to detect termination status in an audio communication system having a first audio channel, wherein the termination status indicates whether exactly one termination circuit is part of the first audio channel of the audio communication system, the system comprising:
a Current Source that drives a resistive load having a first connection and a second connection, wherein the Current Source has an input configured to accept an input voltage, wherein the Current Source is configured to create a voltage differential between the first and second connections of the resistive load, wherein the second connection of the resistive load is connected to the first audio channel of the audio communication system, wherein the Current Source has an output connected to the first connection of the resistive load, and wherein the Current Source is a voltage-controlled Current Source;
an alternating current (AC) voltage generator configured to generate an AC voltage, wherein the input voltage for the Current Source is based on the AC voltage;
a first set of one or more filters having a first input, wherein the first input is connected to the first connection of the resistive load, and wherein the first set of one or more filters is configured to generate a first output signal;
a second set of one or more filters having a second input, wherein the second input is connected to the second connection of the resistive load, and wherein the second set of one or more filters is configured to generate a second output signal; and
first circuitry configured to determine a ratio of the first output signal and the second output signal.