| 摘要 |
A multisound signal demodulator IC has a demodulator for demodulating L + R and L - R signals from a composite input signal and for producing a third signal M when it is present in the composite signal, a matrix circuit for producing L and R signals from the L + R and L - R signals, a pair of changeover switches for supplying either the L and R signals or the M signal to first and second output terminals, and a third changeover switch for supplying either the L + R or M signals to a third output terminal. The generation of the changeover devices are controlled by siganls supplied to external control terminals. The IC is adapted for use in both television receivers and VTR's and is adaptable to use with different methods of multisound transmissions. |
