Abstract: A compact and low cost HDTV receiver is capable of reproducing both an NTSC signal and an HDTV signal. The HDTV signal has a horizontal deflection frequency about twice that of the NTSC signal. The HDTV received includes a construction of a double speed NTSC signal processing portion in the receiver in which a pair of velocity modulation coils 13a and a pair of auxiliary vertical deflection coils 13b are provided on a common bobbin such that the coil pairs are arranged orthogonally to each other.

Abstract: A signal isolating device, such as used in a signal conditioner which converts an output signal from a temperature sensor, or the like, in a process control system, comprising a pulse width signal outputting means, which receives a pulse width modulated signal and produces differentiated pulses at a leading edge and at a trailing edge of the pulse width modulated signal; a first photo-coupler activated by the differentiated pulse produced at the leadinge edge; a second photocoupler activated by the differentiated pulse produced at the trailing edge; a differential pulse reception means comprising a reception resistor for receiving output pulses from the first photocoupler and the second photocoupler and which produces a set pulse or a reset pulse according to the signal generated at the reception resistor; and a flip-flop circuit which is set or reset by the pulse signal produced by the differential pulse reception means.