Abstract: An automatic white balance adjusting circuit comprises a color temperature detecting circuit for producing a detection signal having a voltage in correspondence with a color temperature of an incoming light to an image pickup device, a reference voltage signal generating circuit for generating an A.C. reference voltage signal, a comparing circuit for obtaining a discrimination signal by comparing the detection signal with the reference voltage signal, a plurality of voltage sources for applying different voltages in correspondence with different color temperatures, a selecting circuit for selecting and obtaining voltages from the voltage sources depending on the output discrimination signal of the comparing circuit, and an integrating circuit for integrating output voltage signals of the selecting circuit.

Abstract: An automatic white adjusting circuit for a television camera in which a rough adjustment is first performed with an adjustment quantity of large steps, and fine adjustment is secondly performed with an adjustment quantity of small steps, upon automatic adjustment of the white by performing such operations as directing the television camera towards a white surface. According to the automatic white adjusting circuit of the present invention, the adjusting accuracy of the white balance can be improved, and the white adjustment can be performed automatically within a short period of time.

Abstract: A rotary recording medium reproducing apparatus reproduces a recorded signal from a rotary recording medium by use of a reproducing element. The rotary recording medium is recorded with at least a first carrier signal which is modulated by an information signal having a synchronizing signal of a predetermined frequency.

Abstract: An automatic white adjusting circuit for a television camera in which a rough adjustment is first performed with an adjustment quantity of large steps, and fine adjustment is secondly performed with an adjustment quantity of small steps, upon automatic adjustment of the white by performing such operations as directing the television camera towards a white surface. According to the automatic white adjusting circuit of the present invention, the adjusting accuracy of the white balance can be improved, and the white adjustment can be performed automatically within a short period of time.

Abstract: An automatic white adjusting circuit for a television camera having a color image pick-up tube comprises a first and second variable gain amplifiers for amplifying two predetermined primary color signals of the three primary color signals from an output signal of the image pick-up tube, a matrixing circuit for producing a luminance signal and two color difference signals, by being supplied with either said luminance signal from the output of the image pick-up tube or one remaining primary color signal of the three primary color signals, and outputs of the first and second variable gain amplifiers, an averaging circuit for producing a first and second white detection signals by substantially averaging all or a part of the respective video duration time of the output color difference signals from the matrixing circuit, reference level producing circuit in which a reference level equal to a DC current level of the two predetermined color difference signals of the output signal of the image pick-up tube upon imag

Abstract: A synchronizing signal generator device for television includes an oscillator circuit which generates a color subcarrier signal, a voltage-controlled oscillator circuit which includes a counter and whose oscillation frequency is controlled by the output signal of the first-mentioned oscillator circuit, a counter which receives an output of the voltage-controlled oscillator circuit, and a decoder which receives an output of the second-mentioned counter. The decoder provides a synchronizing signal for the NTSC, PAL or SECAM format in such a manner that the count numbers of the respective counters are controlled. The synchronizing signal generator device for television also includes various circuits for receiving external synchronizing signals. As a result, the synchronizing signal generator device for television can be synchronized with another synchronizing signal generator device for television.

Abstract: A signal generating circuit in a color television system comprises a circuit for producing a signal of a frequency of 282 nfh (where n is an integer, and fh is a PAL-system horizontal scanning frequency) or a signal of a frequency closely approximating 282 nfh, a frequency-divider for frequency-dividing to 1/161 the signal of the frequency 282 nfh or a frequency closely approximating 282 nfh, and a circuit for forming, while satisfying the relationship (282.times.162) nfh.apprxeq.161 nfsc (where fsc is the PAL-system chrominance sub-carrier wave frequency), a signal of a frequency closely approximating the frequency fsc or of the frequency fsc and signals of frequencies fh and fv (where fv is the PAL-system vertical scanning frequency) or of frequencies respectively closely approximating the frequencies fh and fv.

Abstract: A variable frequency oscillator comprises an oscillating loop and a variable phase shifter for imparting one of two different phase shifts depending upon the polarities of a DC control voltage to a signal from the oscillating loop. The phase-shifted signal has its amplitude controlled by the amplitude of the control voltage and is combined with the signal in the oscillating loop. The vector sum of the combined signals determines the phase angle of the oscillator signal and hence the frequency thereof.

Abstract: A rotary recording medium reproducing apparatus reproduces a recorded signal from a rotary recording medium by use of a reproducing element. The rotary recording medium is recorded with at least a first carrier signal which is modulated by an information signal having a synchronizing signal of a predetermined frequency.