Abstract: A synchronizing/separator circuit separates a horizontal synchronizing signal and a vertical synchronizing signal contained within a television signal. A phase locked loop synthesizes a clock signal at 32 fH by phase locking the horizontal synchronizing signal with a divided version of the 32 fH clock signal. The phase locked loop includes a voltage controlled oscillator (VCO) responsive to the phase comparison to perform the phase lock. A circuit separates the run-in clock and caption data in horizontal scanning period 21 H in the vertical blanking interval. A phase comparator receives the run-in clock and phase compares it with the 32 fH clock to produce an alternating control signal which is applied directly to the voltage controlled oscillator for rapid phase locking of the voltage controlled oscillator in preparation for decoding the caption data. The voltage controlled oscillator is controlled by the charging and discharging rate of a capacitor charged by a constant current source.

Abstract: A reset pulse having a desired pulse width is generated in a reset pulse generating circuit 14 in response to a vertical synchronizing signal selected and outputted from input selecting circuit 13 or a frequency-divided output signal of a vertical count down circuit 11, the vertical count down circuit 11 is reset by the reset pulse, and a vertical driving pulse .phi..sub.5 with a predetermined period is generated. Furthermore, phases of the reset pulse and the frequency-divided output signal are compared in a phase comparing circuit 19, a period of a vertical synchronizing signal is determined, and the input selecting circuit 13 and a signal selecting circuit 18 are switched to each other in accordance with the result.

Abstract: A sync detection circuit detects a standard signal which is a signal having V-sync signals with a predetermined repetition period, a non-standard signal which is a signal having V-sync signals with the repetition period other than the predetermined repetition period, and a signal absent condition which occurs when the broadcasting is finished. The sync detection circuit includes a V-sync separator for separating V-sync signals, a counter for counting the predetermined repetition period in relation to each of the V-sync signals and for producing a count-up signal upon counting the predetermined repetition period, and a phase comparator for comparing the phase of the count-up signal with the phase of a V-sync signal and for producing a first level signal, representing the receipt of the standard signal, when the compared signals have the same phase, and a second level signal, representing the receipt of the nonstandard signal, when the compared signals have the different phase.

Abstract: The present invention relates to a vertical synchronizing pulse generating circuit in a television receiver, wherein a vertical synchronizing separation circuit (VS) is so composed not as to directly integrate pulses sequentially outputted from a composite synchronizing separation circuit, but as to integrate a small amount of electric current outputted according to the sequentially outputted pulses. Accordingly, it is possible to reduce the capacity of a capacitor (22) used for the integration and at the same time, it is possible to incorporate the capacitor in an integrated circuit, Thus, it is possible to decrease the number of pins provided to the integrated circuit. Furthermore, the small amount of electric current can be regulated according to the electric current flowing through an externally connected load (28).

Abstract: An automatic hue correction circuit in a television receiver has been found. The present circuit forms a Q signal and an I signal by demodulated three color difference signals. Then, the present circuit compensates hue automatically by rotating demodulation axes so that a level of the Q signal becomes smaller, when a level of the I signal is larger than a reference level.

Abstract: A capacitor is disclosed having two capacitor elements of MIS structure, the capacitor elements being connected in a zigzag manner to realize a balanced parallel connection for the capacitor elements. A circuit having a pair of balanced impedance branches, the branches being bridged by the balanced parallel capacitor disclosed above, resultantly sustains the impedance branches balanced regardless of the amount of the parasitic capacity involved.

Abstract: A noise detecting circuit in a television receiver, which comprises a horizontal synchronizing signal separating circuit (17) for separating a horizontal synchronizing signal from a detected composite video signal, a differential circuit (101) for extracting a noise component included in the horizontal synchronizing signal period of the composite video signal as a function of the separated horizontal synchronizing signal, and a rectifying circuit (102) for rectifying the extracted noise component for providing a direct current voltage associated with the magnitude of the noise component in the composite video signal. The noise detected output is applied to an automatic frequency control circuit (26) for the purpose of controlling the sensitivity of an automatic frequency control operation thereof. The noise detected output is also applied to the automatic frequency control circuit (26) for the purpose of controlling the impedance of a filter thereof.

Abstract: A noise removing apparatus in an FM receiver includes a high-pass filter (29) receiving an output from an FM detector circuit (11), a gate (15) being interrupted in response to a pulsive noise detected by level-discriminating an output from a variable gain amplifier (35) receiving an output from the high-pass filter (29). Transistors are provided for controlling the gain of the variable gain amplifier (35) according to the magnitude of a terminal voltage of a capacitor which is charged according to an output from a rectifying circuit (43). The noise removing apparatus further includes a voltage generator (51) for generating a voltage proportional to a received electric field strength and a circuit (53) for varying an amount to be charged in the capacitor according to the magnitude of a voltage from the voltage generator (51) for maintaining the gain of the variable gain amplifier (35) large at the time of strong electric field, so that a multipath noise can be effectively removed.

Abstract: A pulsive noise removing apparatus comprises a subtracting circuit (35) receiving one input thereto a stereo composite signal directly from a delay circuit (31). A stereo switching signal is generated as a function of a stereo pilot signal included in the stereo composite signal and a cancel signal of the same level, the same frequency and the same phase as those of the stereo pilot signal is generated as a function of the stereo switching signal. A gate (67) is interposed between the output of the cancel signal generating circuit (65) and the other input of the subtracting circuit and the gate is interrupted responsive to detection of a pulsive noise included in the composite signal. The pulsive noise is removed due to interruption of the gate and the stereo pilot signal is prevented from appearing at the output of the subtracting circuit irrespective of conduction or interruption of the gate.

Abstract: A noise removing apparatus is interposed between an FM detecting circuit and a stereo demodulating circuit. The noise removing apparatus is responsive to a pulsive noise included in the output from the detecting circuit to enable a first gate to interrupt transmission of the output. Although the stereo pilot signal is disturbed during the interruption period, the disturbed stereo pilot signal is canceled by a pseudo-stereo pilot signal (a signal similar to the pilot signal) separately generated, whereby the disturbed stereo pilot signal is prevented from being applied to the stereo demodulating circuit.

Abstract: An input signal including a pulsive noise such as an ignition noise in superposition on a continuous noise such as a white noise is applied commonly to the base electrodes of a pair of transistors of the same conductivity type implementing a differential amplifier. The amplified signal is applied to first and second rectifying circuits for full-wave rectification. The output of the first rectifying circuit is detected by a detecting circuit. The output of the second rectifying circuit is applied to a pulsive noise detecting circuit for detection of a pulsive component. The ratio of the detecting level of the detecting circuit to the detecting level of the pulsive noise detecting circuit is determined for avoiding malfunction of the pulsive component detecting circuit by virtue of the continuous noise.

Abstract: An input signal could include a pulsive noise such as an ignition noise in superposition on a continuous noise such as a white noise. Such input signal is commonly applied to the respective base electrodes of paired transistors of the same conductivity type connected in a differential amplifier fashion. The amplified signal is then applied to a rectifying circuit, where the signal is full-wave rectified, and the output of the rectifying circuit is detected by a detector. The detected output is then applied to the base electrode of a first transistor. A second transistor is provided such that a current mirror circuit is formed between the collector electrode of the second transistor and the collector electrode of the first transistor. A diode circuit is connected between the current mirror circuit and the collector electrode of the second transistor in the forward direction.

Abstract: An apparatus for removing a pulsive noise in an FM stereo signal including a stereo information signal and a stereo pilot signal, said composite signal further including a pulsive noise, said apparatus comprising an FM detector for providing said composite signal, a noise detector for detecting said pulsive noise for providing a control signal of a predetermined pulse width upon occurrence of said noise, a gate circuit to be normally closed for passing therethrough said composite signal and to be opened by the output from the noise detector, an amplifier for amplifying the output from the gate, a frequency band cut off filter coupled to said amplifier to form a negative feedback circuit, said filter being set to the pilot signal frequency and/or the subcarrier signal frequency, an attenuator coupled to the output of said amplifier, and a capacitor coupled to the output of said gate circuit and cooperative with said attenuator for holding, when the gate is opened, the signal level at the output of the gate to