SU1322495A1 - Device for generating single-band phase-shift keyed signal - Google Patents

Abstract

The invention relates to electrical networking and simplifies a device by eliminating a distribution coder, an adder and a single modulator while at the same time improving the shaping accuracy. The device contains a carrier oscillator 1, a modulator 2, a band-pass filter 3. The oscillator 1 produces harmonic oscillations with a variable phase. The phase of oscillations from one clock pulse to another is increased by a certain amount of LH. In the modulator, the carrier oscillation of the generator 1 and the information pulses are multiplied. The band-pass filter 3 filters out-of-band modulation products. The device is simplified by connecting the output of the modulator 2 to the input of the band-pass filter 3 and by running a generator 1 consisting of two registers, a phase accumulator, an adder, a signal phase-to-amplitude converter, a lower filter frequency and reference oscillator. 3 silt with (L with SP

Description

The invention relates to telecommunications and can be used in discrete information transmission systems.

The purpose of the invention is to simplify the device by eliminating the distribution coder, the adder and one modulator while at the same time improving the accuracy of the formation,

Fig. 1 shows a structural electrical circuit of the device proposed; Fig. 2 is a structural electrical circuit of a carrier oscillator; on fig.Z - timing diagrams.

A device for generating a single-sided phase-shift keyed signal contains a carrier oscillator 1, a modulator 2, a band-pass filter 3.

The carrier oscillation generator contains the first and second registers 4 and 5, phase storage 6, reference oscillator 7, adder 8, signal-to-amplitude phase converter 9, low-pass filter 10.

The device works as follows.

On the information input postzgaet n

binary signal Z-а. from n pulses (Fig, Za) o Synchronously with information pulses to the clock input receives the clock synchronization pulses (Fig.Zb). When the device is turned on, a carrier oscillator 1 is started, which produces harmonic oscillations with a variable phase.

In cos (wot + cho); (ABOUT

where B is the amplitude of the carrier oscillation;

the central frequency of the spectrum of a single band oscillation; initial phase shift; clocked phase shift. The phase of oscillations from one clock pulse to another increases by, i.e. after the arrival of n clock pulses at the input of the generator 1 carrier oscillation, and therefore the arrival of n informational bullets at the input of the device, the oscillation phase will change to 44 n atf (Fig. 3b, diagram plotted, case dif I / g) Carrier oscillation from generator 1 carrier wave arrives

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13224952

to the first input of the modulator 2, and information pulses from the input of the device are fed to the second input of the modulator 2, which multiplies them. The input of the bandpass filter 3 receives a signal

n (t) cos (w, t + q-o + K 4tf). (2)

(Fig. 3d), which, after filtering out the out-of-band modulation products, goes to the output of the device.

The oscillator carrier 1 operates as follows.

Initially, zero is written to phase accumulator 6 and registers 4 and 5. Upon the arrival of the first pulse from the reference generator 7, the phase collector 6 performs the summation

the values of the phase, i.e. a zero with a phase step K, previously recorded in register 4. From the output of phase accumulator 6, the phase value through the adder 8 is fed to the phase converter of the signal to amplitude 9 and to the input of the phase accumulator 6, In the presence of a clock pulse, the adder 8 adds to the phase jump i, previously

recorded in register 5. The new phase value is fed to the input of the phase accumulator 6, which again adds the phase value to the phase value. step K, then the whole process is repeated. Thus, phase accumulator 6 and adder 8 produce phase accumulation in the absence of a clock pulse and a jump with further phase accumulation in the presence of a clock pulse. Пре Converter 9 of the signal phase into amplitude converts each incoming phase value to the amplitude value of the carrier oscillation, which filter integration

10 low frequencies are fed to the output of carrier oscillator 1.

50

Claims (1)

Invention Formula A device for forming a single-band phase-shift manipulation sig-oscillation, the output of which is connected to the clock input of the modulator, and a 55-band filter, which, in order to simplify the device by eliminating the distribution coder, adder and one modulator, while simultaneously increasing the accuracy of formation The output of the modulator is connected to the input of a bandpass filter, the output of which is the output of the device, the clock and informational inputs of which are respectively the input of the carrier oscillator Nor does the modulator information input, while the carrier oscillator contains two registrations phase accumulator, adder, signal phase to amplitude converter, low pass filter and reference oscillator, the output of which is connected to the first input of the phase accumulator, the output of which is connected to the first input of the adder the output of which is connected to the second input of the phase accumulator and to the input of the phase converter signal to the amplitude, the output of which is connected to the input of the low-pass filter, the output of the first register is connected to tert The input of the phase accumulator, the output of the second register is connected to the second input of the adder, the third input of which is the input of the carrier oscillator, the output of which is the output of the low-pass filter. I  III I ll And r And And r VWVimiAAUVVWVlWl Editor E. Papp Compiled by O. Geller Tehred M. Morgental 2879/56 Circulation 638 Subscription VNIISH State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 VlWl I I I Proofreader I. Muska