SU508958A1 - Frequency telegraphy signal shaping device with suppressed emissions - Google Patents

Description

The device works as follows. The encoder 9 at the moment of changing the signals at any of its inputs, being the device's inputs, generates a signal to start the driver 10, commut a pulse sequence corresponding to the required change in the output frequency of the device (one frequency interval - LHP and one, two or three intervals - with ADF), includes an additional circuit 6 for adding and subtracting pulses for adding if a change in the output frequency of the device is required in the direction of increasing, and vice versa, it delays The variation ku signals to control inputs of discrete transducer 3 with respect to the corresponding signals LM variations at the input to the interval B | webbings equal duration 1posledovatelnosti pulse shaper 10.

In steady-state mode, the average pulse frequency at the input of the discrete frequency divider 7 is equal to the required code frequency multiplied by the division factor of this divider, and is formed by algebraic summing up two or three frequencies removed from the taps of the multiple-split frequency divider 2.

Consider the formation of DTT sipnals, when the previous parcel was leaked at the lowest code frequency 1n, and the subsequent parcel should (transmitted at the most coiling frequency, i.e., the output frequency of the device should change upwards by the amount of three frequency intervals.

In the formation of the frequency n in the pulse addition circuit 4, the two sequences of pulses coming from the multiple-pass frequency divider 2 are added together with the following frequencies that are twice as different. Scheme 5 of add-exclude AND M1 pulses works on subtraction. At the time of changing the information signals at the device inputs, the shaper 0 is started, the output of which, in accordance with the signal of the encoder 9, receives a sequence of pulses with a monotonically decreasing) tracking interval corresponding to a change in the output frequency of the device by the value of three frequency intervals. An additional circuit 6 for adding and eliminating pulses with the signal of the encoder 9 is included in the addition. The arrangement of the pulses in the sequence, decreasing from the output of the imaging unit 10, is chosen such that at the end of the time interval m, equal to the duration of the sequence, the frequency at the output of the device is equal to Hz. At this moment, the driver 10 stops, the required frequency value is further provided by the operation of the additional circuit 6 for adding-suppressing pulses for addition, for which at its control input at the end of the interval t the signal is reversed.

Formula of invention

A sipnale generation unit of frequency p dual frequency telegraphy with suppressed out-of-band emissions, comprising a reference oscillator with a multi-tap frequency divider connected to it, an encoder combining the inputs of the manipulation signals, a discrete frequency divider with an output low-pass filter and a discrete converter consisting of pulse addition circuits and pulse exclusion-pulse circuits connected by their inputs to the tap-offs of the multi-tap frequency divider and the outputs of the tweeter, characterized by that, in order to suppress out-of-band emissions due to a transition from one frequency to another according to a given law, the additional output of the multiple-split frequency splitter is connected to the input of the pulse trainer with monotonically varying intervals of the sequence, the output of which is connected to the input of the discrete frequency splitter through an additional an impulse-exclusion circuit connected to the output of a discrete converter, to the third input of which and the remaining inputs of the generator vatelynostey pulses with monotonically varying intervals yuschi1mis sequencer connected itelnye complement outputs of the encoder.