SU393808A1 - DEVICE FOR TWO-CHANNEL MODULATION OF PULSE PERIODIC SIGNALS - Google Patents

Description

The device can be used in telemetry, accurate magic recording, of s} and automation.

Devices are known for dual-channel modulation of pulsed periodic signals with switching on the output of the frequency modulator at the input of the G-orbit modulator.

The purpose of the invention is to expand the modulation range. It is achieved by the fact that the first input of the proposed device is connected to the control unit 1n1, the equiparative input of which is connected to the output of the frequency pulse modulator, and the output to the inputs of both modulators, and the second input of the device is connected to the signal input a pulse width modulator whose output is a device output.

The drawing shows a block diagram of the proposed device.

The device contains input terminals / for connecting the first signal source, input 2 for connecting the second signal source, output terminals 3 from which the modulated pulse signal is removed, memory unit 4, frequency-pulse modulator 5 of the first subchannel, pulse-width modulator 6 of the second subchannel, sources constant The displacement is 7 and 5.

The memory unit 4 has a signal input connected to the terminal U, and a control input connected to the outputs of the modulator 5 connected to the memory unit 4 via its input 7 via the source 7. The pulse-width modulator 6 has a sig- nal input connected via the source 8 to terminal 2, a triggering input connected to the output of the modulator 5, and a control input connected to the output of the ignition unit 4 through source 7. The output of the modulator 6 is connected to the upper terminals 3.

The frequency-pulse modulator 5 operates in the self-oscillating mode, producing impulses with the following frequency f, (jf) At the moment; the arrival of each of these pulses to the control SURROUND the input of memory 4, the latter memorizes the input voltage 1x (/ ix (O of the first signal, returns this value / ixDg;) until the moment // + 1 arrives the next pulse. Voltage (7i1 ( i) is added to the constant voltage f / oi of the source 7, after which it is fed simultaneously to the input of the modulator 5 and to the reverse input of the modulator 6.

In the first case, the total voltage determines the duration of 7; the corresponding I-ro cycle of operation of a frequency-multipulse modulator, with

T - (/, (,),

where ui is a constant coefficient.

In the second case, the total voltage determines the steepness L of the requirement for the second voltage to be wider and the output of 1 IN1M1NUL is € 0V, Nficem

bi a, U ,, (ti) -} - T ,,} where uz is a constant coefficient.

Duration T; The output pulse of the pulse of the ohlMl module of the modulator 6 in the cycle in question is determined by the twist transformation bt and the current value of the voltage of the signal input 8 equal to the sum of the current voltage / VHg according to the expression

 LYH, (0 + f / 0.1, (/) + I, (0 +

).

Accordingly, the wringing factor E / of the sequence of width-modulated emulsions at the output terminals 3 is a linear function of the voltage of the second signal, i.e.

e.,.

Linear dependences of the frequency of the trace and output pulses on the voltage of the first signal source and the fill factor of the sequence of these 1M1 pulses on the voltage of the second signal source occur both with slow change of input signals and with fast change of signals with a frequency not exceeding ten fractions initial pulse frequency. This is achieved, in particular, due to the application at the input of the entire device of the analog key memory unit and its control input connected to the output of the frequency-pulse modulator. However, if the first input signal is a slowly changing function of time, a wrinkle block can be eliminated. At the same time, distortions in the conversion of iie signals occur even in a wide range of the second input signal, the upper frequency of which is not equal to tenths of the initial frequency.

Sources of constant displacement 7 and 8 included in the device for setting the initial frequency and duration allow the conversion of bipolar input voltages. In some cases, when the first or second input voltage is single-ended and the change in its instantaneous values in time does not exceed half the value of the constant component, one of the sources can be excluded from the circuit. In addition, to set the frequency or duration, you can use a grounded current source or resistor

dividers independently included in the scheme or funadionally combined with the links of one of the modulators.

subject matter

A device for two-channel modulation of pulsed periodic signals containing a frequency-pulse module of a torrent of the first channel, the output of which is connected

to the memory unit, whose 1 directing input is connected to the output of the frequency-and-pulse modulator, and the output to the inputs of both modulators, the second input of the device being connected to the strong input of the pulse-width modulator whose output is the output | M of the device.