# US 2013/0156238 A1 · Adaptive crosstalk rejection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0156238 A1 - Document ID: US20130156238A1 - Status: Published application - Kind: A1 - Application number: 13/680,224 - Filed: 2012-11-19 - Published: 2013-06-20 - Earliest claimed: 2011-11-28 - Assignees: Sony Mobile Communications Inc. - Inventors: Magnus Birch; Kaj Ullen - Web page: https://patentgrep.com/patent/US20130156238A1 ## CPC - H03F 3/181: Low-frequency amplifiers, e.g. audio preamplifiers - H03F 3/68: Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics {(power amplifiers using a combination of several semiconductor amplifiers H03F3/211; combinations of amplifiers using coupling networks with distributed constants H03F3/602)} - H04R 5/04: Circuit arrangements, {e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments (combinations of amplifiers H03F3/68; stereophonic systems H04S)} - H04R 5/033: Headphones for stereophonic communication {(details thereof, e.g. relating to batteries, cables or control elements H04R1/10)} - H03F: AMPLIFIERS - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) ## Abstract Embodiments of the invention are directed to systems, methods and computer program products for reducing crosstalk between two systems or between parts of the same system. In some embodiments, a method includes transmitting, from a first signal source, a first input signal to a first amplifier associated with a first audio-listening channel. Additionally, the method includes measuring a signal level along a common path shared by the first audio-listening channel and the second audio-listening channel, wherein the common path includes at least some resistance. Additionally, the method includes determining a compensation signal to be injected into the second audio-listening channel based at least partially on the measured signal level. Additionally, the method includes injecting at least a part of the first input signal into the second audio-listening channel based at least partially on the determined compensation signal, thereby reducing a current level in the second audio-listening channel. ## Claims ### Claim 1 A method for reducing crosstalk in an audio-listening channel, the method comprising: detecting a first audio-listening channel and a second audio-listening channel; transmitting from a first signal source a first input signal to a first amplifier associated with the first audio-listening channel; measuring a signal level along at least a partial portion of the common path shared by the first audio-listening channel and the second audio-listening channel, wherein the common path includes at least some resistance; determining a compensation signal to be injected into the second audio-listening channel based at least partially on the measured signal level; and injecting at least a part of the first input signal into the second audio-listening channel based at least partially on the determined compensation signal, thereby reducing a current level in the second audio-listening channel. ### Claim 2 (depends on 1) The method of claim 1, further comprising: transmitting from a second signal source a second input signal to a second amplifier associated with the second audio-listening channel; and injecting at least a part of the second input signal into the first audio-listening channel based at least partially on the measured signal level, thereby reducing a current level in the first audio-listening channel. ### Claim 3 (depends on 2) The method of claim 2, wherein the step of injecting at least a part of the first input signal into the second audio-listening channel is performed substantially simultaneously with the injecting at least a part of the second input signal into the first audio-listening channel. ### Claim 4 (depends on 1) The method of claim 1, wherein the signal source is a voltage source and the signal level is a voltage level. ### Claim 5 (depends on 1) The method of claim 1, wherein the first audio-listening channel includes a first earphone associated with a first impedance and the second audio-listening channel includes a second earphone associated with a second impedance. ### Claim 6 (depends on 2) The method of claim 2, wherein the first input signal is associated with a first frequency and the second input signal is associated with a second frequency different from the first frequency. ### Claim 7 (depends on 1) The method of claim 1, wherein at least one of the transmitting, measuring, determining, or injecting steps is performed in a digital domain. ### Claim 8 (depends on 1) The method of claim 1, wherein the detecting step further comprises: detecting a connector inserted into an audio-producing system, wherein the connector is associated with the first audio-listening channel and the second audio-listening channel. ### Claim 9 (depends on 1) The method of claim 1, further comprising: in response to detecting the first audio-listening channel and the second audio-listening channel, producing an audible beep. ### Claim 10 (depends on 1) The method of claim 1, wherein the measuring step further comprises: determining a first impedance associated with the first audio-listening channel; determining a second impedance associated with the second audio-listening channel; and measuring the signal level along the common path based at least partially on the first impedance and the second impedance. ### Claim 11 (depends on 1) The method of claim 1, wherein the measuring step further comprises: disabling an injecting module that performs the injecting step; disabling an input signal provided to an amplifier located in a measuring module; and maximizing a gain associated with the amplifier located in the measuring module, wherein the measuring step is performed using the measuring module. ### Claim 12 (depends on 2) The method of claim 2, wherein the step of measuring a signal level along at least a partial portion of the common path shared by the first audio-listening channel and the second audio-listening channel further comprises measuring an output signal level associated with the first amplifier and measuring an output signal level associated with the second amplifier. ### Claim 13 (depends on 2) The method of claim 2, wherein the step of measuring a signal level along at least a partial portion of the common path shared by the first audio-listening channel and the second audio-listening channel further comprises measuring an input signal level associated with an amplifier located in the measuring module. ### Claim 14 (depends on 2) The method of claim 2, wherein the measuring step is performed using a measuring module and the step of measuring a signal level along at least a partial portion of the common path shared by the first audio-listening channel and the second audio-listening channel further comprises using a compensation factor associated with the configuration of the measuring module. ### Claim 15 (depends on 1) The method of claim 1, wherein the measuring step is performed using a measuring module; and wherein the measuring module includes a circuit comprising a microphone. ### Claim 16 (depends on 1) The method of claim 1, further comprising: measuring a current level in the first audio-listening channel; measuring a current level in the second audio-listening channel; and comparing the current level in the first audio-listening channel and the current level in the second audio-listening channel to determine that a difference between the current level in the first audio-listening channel and the current level in the second audio-listening channel is greater than a predetermined threshold level. ### Claim 17 (depends on 1) The method of claim 1, further comprising: measuring a current level in the second audio-listening channel; and comparing the current level in the second-audio listening channel and a predetermined threshold current level to determine that the current level in the second audio-listening channel is greater than the predetermined threshold current level. ### Claim 18 (depends on 1) The method of claim 1, further comprising: providing an application; determining a maximum crosstalk value associated with the application; comparing a current level in the first audio-listening channel and a current level in the second audio-listening channel to determine a measured crosstalk value; comparing the measured crosstalk value and the maximum crosstalk value to determine that the measured crosstalk value is less than or equal to the maximum crosstalk value; and permitting execution of the application. ### Claim 19 A computer program for reducing crosstalk in an audio-listening channel, the computer program product comprising: a non-transitory computer readable medium comprising code configured to cause a computer to: detect a first audio-listening channel and a second audio-listening channel; transmit from a first signal source a first input signal to a first amplifier associated with a first audio-listening channel; measure a signal level along at least a portion of a common path shared by the first audio-listening channel and a second audio-listening channel, wherein the common path includes at least some resistance; determine a digital compensation signal to be injected into the second audio-listening channel based at least partially on the measured signal level; and inject at least a part of the first input signal into the second audio-listening channel based at least partially on the determined compensation signal, thereby reducing a current level in the second audio-listening channel. ### Claim 20 A system for reducing crosstalk in an audio-listening channel, the system comprising: a memory; a processor; a module stored in the memory, executable by the processor, and configured to: detect a first audio-listening channel and a second audio-listening channel; transmit from a first signal source a first input signal to a first amplifier associated with a first audio-listening channel; measure a signal level over at least a portion of a common path shared by the first audio-listening channel and a second audio-listening channel, wherein the common path includes at least some resistance; determine a compensation signal to be injected into the second audio-listening channel based at least partially on the measured signal level; and divert at least a part of the first input signal to the second audio-listening channel based at least partially on the determined compensation signal, thereby causing an output signal level of a second amplifier associated with the second audio-listening channel to substantially match the signal level over the common path.