ข้อมูลDEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER (masers, lasers H01S; circuits capable of acting both as modulator and demodulator H03C, e.g. balanced modulators H03C0001540000; details applicable to both modulators and frequency-changers H03C; demodulating pulses which have been modulated with a continuously-variable signal H03K0009000000; transforming types of pulse modulation H03K0011000000; relay systems, e.g. repeater stations H04B0007140000; demodulators adapted for digitally modulated-carrier systems H04L0027000000; synchronous demodulators adapted for colour television H04N0009660000)

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