Sony Corporation

Yukio Onoe

Mitsuo Ohsawa

Hiroshi Yamagishi

Wataru Yamatani

A circuit adapted to detect an angle-modulated signal including a pair of terminals to which the angle-modulated signal is supplied in push-pull relation and a high-pass filter circuit coupled to the pair of terminals for transmitting those frequencies of the angle-modulated signal which exceed a cut-off frequency. A differential amplifier has a pair of inputs coupled to the high-pass filter circuit to receive the filtered angle-modulated signal as a reference signal and a quadrature generator is coupled to the high-pass filter circuit and is responsive to the filtered reference signal for generating a quadrature signal whose phase varies with respect to the reference signal as a function of the change in frequency of the reference signal. A multiplier is coupled to the differential amplifier outputs and includes an input for receiving the quadrature signal so as to be switched in response to these respective signals for producing an output signal which is a function of the phase difference between the reference and quadrature signals.

Angle-modulation detector having push-pull input applied through

A receiver has a first input circuit and a first amplifier connected to a first rectifier circuit and has a second input circuit and a second amplifier connected to a second rectifier circuit. The first and second rectifier circuits produce first and second direct current signals, and the first and second rectifier circuits are connected to a meter drive circuit which produces a direct current signal in response to the first or second direct current signal so that the direct current signal from the meter drive circuit actuates a meter to indicate the input level of either the first input circuit or second input circuit.

Growing community of inventors

Tokyo, Japan

Yukio Onoe