Crosstalk cancellation using load impedence measurements

An arrangement for providing a first channel and a second channel to a headphone jack, said arrangement comprising:

• a first output amplifier for amplifying a first input signal for the first channel, said first amplified signal being supplied to a first load associated with the headphone jack;
• a second output amplifier for amplifying a second input signal for the second channel, said second amplified signal being supplied to a second load associated with the headphone jack;
• a reference amplifier for providing a reference signal between the first and second loads;
• and
• a crosstalk cancellation unit for canceling crosstalk between the first and second channels, said crosstalk cancellation unit comprising:
• means for splitting the first and second signals prior to inputting the signals to the first and second output amplifiers;
• and
• means for adding a split portion of each signal to the other signal on the inputs of the first and second output amplifiers.

An arrangement for providing a first channel and a second channel to a headphone jack, said arrangement comprising:

• a first output amplifier for amplifying a first input signal for the first channel, said first amplified signal being supplied to a first load associated with the headphone jack;
• a second output amplifier for amplifying a second input signal for the second channel, said second amplified signal being supplied to a second load associated with the headphone jack;
• a reference amplifier for providing a reference signal between the first and second loads;
• and
• a crosstalk cancellation unit for canceling crosstalk between the first and second channels, said crosstalk cancellation unit comprising:
• first and second splitters for splitting the first and second input signals into two paths each;
• means for inputting a first path of each signal to each signal's respective output amplifier;
• a first adder for adding together a second path of the first and second signals;
• a gain function for adjusting the sum of the first and second signals;
• a second adder for adding a suitable DC bias to the adjusted sum;
• and
• means for inputting the biased adjusted sum to the reference amplifier.