Headphone driving circuit

A headphone driving circuit comprising:

• a signal generator to compose a first composite signal generated by subtracting a second channel audio signal from a first channel audio signal, a second composite signal by subtracting the first channel audio signal from the second channel audio signal, and a third composite signal generated by adding the first and the second channel audio signal;
• a first amplifier to drive one end of a first voice coil of a stereo-headphone by amplifying the first composite signal;
• a second amplifier to drive one end of a second voice coil of the stereo-headphone by amplifying the second composite signal;
• and
• a third amplifier to drive the other end of the first and the second voice coil of the stereo-headphone by amplifying the third composite signal.

A headphone driving circuit comprising:

• an adder/subtracter unit to generate a first composite data by subtracting a second channel audio data from a first channel audio data, a second composite data by subtracting the first channel audio data from the second audio data, a third composite data by adding the first channel audio data and the second channel audio data;
• digital to analogue converters to convert the first, the second and the third digital composite data to each analogue signal for generating a first, a second and a third analogue composite signal;
• a first amplifier, to drive one end of a first voice coil of a stereo-headphone by the first composite data;
• a second amplifier to drive one end of a second voice coil of the stereo-headphone by the second composite data;
• and
• a third amplifier to drive the other end of the first and the second voice coil of the stereo-headphone by the third composite signal.