摘要:
A tuning circuit for tuning a high frequency receiving apparatus with residual sideband modulation, especially a television receiver, with a counter for forming encoded values of tuning voltage, with a store for the digital storing of the encoded values of tuning voltage, with a D/A converter for generating the analog tuning voltages from the encoded values and with a circuit for automatic fine tuning to the required position of a received transmitter. In such tuning circuit means are provided which so alter the value of the tuning voltage before or during writing into the store or after or during reading out from the store that this value corresponds not to the required tuning position but to a tuning position shifted into the fully transmitted sideband. The exact tuning ot the transmitter to the required position is effected by the circuit for fine tuning.
摘要:
A remote control device for operation by means of radiation comprising a receiver for the radiation including means for transforming the radiation into an electric signal and rectification means for rectifying the electric signal.
摘要:
A circuit, for producing direct voltages, for example the tuning voltages for a television or radio receiver, lying within a direct voltage range from pulses fed to an integrating circuit at whose output the direct voltages appear. A plurality of pulses (I) are fed to the integrating circuit, at whose output the direct voltage (U.sub.I) appears, within a period duration (T) assigned to the desired direct voltage range, with the period duration (T) being at least of the magnitude T = (U.sub.max - U.sub.min) .multidot..DELTA..tau./.DELTA.U.sub.I, where (U.sub.max - U.sub.min) is the desired direct voltage range, .DELTA..tau. is the shortest time duration of a pulse (I) and .DELTA.U.sub.I is the smallest voltage step width associated with the shortest pulse duration .DELTA..tau. by which two different direct voltages (U.sub.I) at least differ from one another.
摘要翻译:用于产生直流电压的电路,例如电视或无线电接收机的调谐电压,位于从输出直流电压的积分电路的脉冲的直接电压范围内。 在分配给期望的直流电压范围的周期持续时间(T)期间,多个脉冲(I)被馈送到积分电路,在其输出处出现直流电压(UI),周期持续时间(T)至少为 的幅度T =(Umax-Umin)×DELTA tau / DELTA UI,其中(Umax-Umin)是期望的直流电压范围,DELTAτ是脉冲(I)的最短持续时间,并且DELTA UI是最小电压 与两个不同的直接电压(UI)至少彼此不同的最短脉冲持续时间DELTAτ相关联的步长。
摘要:
A frequency sensitive network responsive to frequencies somewhat above the useful signal band of a demodulated radio signal is interconnected with the inputs of a differential amplifier, so that the desired signal and the portions of the interference signals unaffected by the frequency sensitive circuit cancel out and a "stripped" interference signal is obtained which is fed to a transistor circuit that produces trigger pulses for a multivibrator, regardless of which side of the differential amplifier first produces a pulse. The multivibrator provides pulses to a blanking switch and also charges a capacitor in a RC network, in which charge accumulates when the control pulses are bunched closely in time and this effect is used to produce a bias for disabling the provision of trigger pulses to the multivibrator until the capacitor charge leaks off.
摘要:
The invention relates to an electronically controlled ignition system in which a correction signal is obtained from a control signal derived directly from an ignition pulse sensor. The invention consists of producing a saw-tooth signal with a rising flank and a falling flank within one cycle of the square wave control signal, using only one flank of the said control signal. The ratio or relationship between the gradients of the two flanks is a measure of the change in the corrected signal relative to the control signal. The electronically controlled ignition system is particularly suitable for compensating for the ignition advance, caused by an induction sensor, as compared to the mechanical position of the rotor at low engine speeds.
摘要:
The circuitry is used, for identifying television transmitters, in a television set receiving synchronizing signals and line flyback pulses characteristic of television transmitters, particularly for television receivers including a station finder circuit. The circuitry, during the time period of the line flyback pulses, derives samples of those signals appearing above the black level of the video signal, from the demodulated input signal. The number of amplitude jumps determined during the time period of the line flyback pulses is utilized as the criterion for identification of a television transmitter. The signals appearing above the black level of the video signal are inverted and then combined, in an AND circuit, with the line flyback pulses, and the output of the AND circuit is connected to a digital counter circuit to supply the output pulses thereto as counting pulses, with the flyback pulses being supplied to the digital counter circuit as gate pulses. An inverter is connected to the output of the counter circuit and a logic "1" potential appears at the output of the inverter only in the case where a single pulse has been delivered to the counter circuit during the gate time, with a logic "0" potential appearing at the output of the inverter in all other cases. The output of the inverter is connected, through an integrating circuit, to a threshold circuit providing an output signal which indicates whether a television transmitter has been identified.
摘要:
A transmitter amplifier comprises a transistor forming a class B or C amplifier element and output and input circuits for the amplifier element connected by a low-pass filter with a limiting frequency below the intended frequency band of the amplifier.
摘要:
An ignition system has an electronic control unit which produces trigger pulses in response to received ignition control signals, the control unit also receiving test pulses indicating the period of time for which current supplied to the primary winding of the ignition coil is at its maximum value, the control unit extending the test pulses and supplying the extended pulses to a logic circuit which, when a trigger pulse occurs without an extended pulse simultaneously occurring, produces an output signal to indicate misfiring, and to temporarily switch off the control.
摘要:
In a circuit producing an output voltage independent of temperature and comprising first and second pairs of interconnected transistors arranged in parallel circuit branches, the active transistor areas of the transistors within each pair are arranged to be different.
摘要:
An electronic ignition system comprising an ignition coil, having the spark gap in circuit with its secondary winding, a primary transistor and a current limiting circuit in circuit with its secondary winding, a filter transistor connected in front of said primary transistor and controlled by a control signal and a resistor network connected in the current path of the filter transistor, the filter transistor and the resistor network being so dimensioned that, during a rise in current in the primary winding, the further transistor is in saturated operation and a jump in the voltage across the resistor network to a constant maximum voltage when the current is limited by the current limiting circuit, a pulse being derivable from the voltage curve at the resistor network.