Abstract: Improvements in signal receiving apparatus of the type including a tuning stage having a presettable channel selecting storage device for storing selected channel identity signals representing predetermined channels to which the tuning stage is tunable and wherein any of the stored channel identity signals is selectively read out so as to control the tuning stage to be tuned to the channel represented by the read out channel identity signal. The improvements comprise a presettable memory device for storing control signals associated with the respective predetermined channels, these control signals being used to control at least one operating condition of the signal receiving apparatus. A selectively operable preset circuit generates at least one control signal for storage in the memory device when the tuning stage is tuned to an associated channel during a preset operation.

Abstract: In a phase locked loop circuit which includes a variable frequency oscillator, a reference signal oscillator, a phase comparator for detecting the phase difference between the output signals of the reference signal oscillator and the variable frequency oscillator, respectively, and a low pass filter supplied with the output of the comparator so as to provide a corresponding DC voltage for controlling the variable frequency oscillator, and in which the variable frequency oscillator is manually changed, as by a variable capacitor, so that the frequency thereof is an integral multiple of the frequency of the reference signal oscillator; a control signal generating circuit is provided to detect the DC voltage from the low pass filter and to produce a control signal when the DC voltage is outside a predetermined voltage range, with the control signal being applied to the variable frequency oscillator so as to vary the frequency thereof outside of the lock range of the phase locked loop toward the capture range the