Patent ID: 6438237
Filing Date: 2002-08-20
Classification: H04R

Abstract:
A drive circuit for a 3D sound system comprising:a first amplifier arranged to provide an L-channel speaker terminal and a woofer terminal with an amplified L-channel sound signal from an L-channel sound signal source; a second amplifier arranged to provide an R-channel speaker terminal and said woofer terminal with an amplified R-channel sound signal from an R-channel sound signal source; an impedance element connected between said L-channel sound signal source and said L-channel speaker terminal and between said R-channel sound signal source and said R-channel speaker terminal, the impedance element being arranged to synthesize said amplified L-channel sound signal output by said L-channel sound signal source with said amplified R-channel sound signal output by said R-channel sound signal source; and a third amplifier arranged to output the sound signal synthesized by said impedance element to said woofer terminal; wherein the first amplifier is a final stage amplifier for the L-channel speaker terminal such that there is no amplifier between one end of the impedance element and the L-channel speaker terminal; and the second amplifier is a final stage amplifier for the R-channel speaker terminal such that there is no amplifier between another end of the impedance element and the R-channel speaker terminal.