MULTICHANNEL TELEVISION SOUND STEREO AND SURROUND SOUND ENCODER

摘要

The present invention provides method and apparatus for transmitting stereoand surround sound information of the L-R signalwithout excessive attenuation at the higher frequencies in order to allowtransmission of surround sound through a noisy medium. Theapparatus includes an audio breakout matrix (20) coupled to receive a left(12) and a right (14) audio inputs; a surround sound conditioner(22) coupled to receive a L-R signal portion of the television signal for pre-emphasizing and companding the L-R signal to produce aconditioned L-R signal; a mixer (26) coupled to the surround sound conditionerfor switching the conditioned L-R signal at apredetermined value to produce an amplitude modulated L-R signal; and asynchronizing circuitry (24, 29) coupled to the mixer formaintaining the predetermined value in step with the reference value, whereinthe mixed L-R signal is combined with a L+R signal portionof the television signal to produce a composite output signal (18).