SU1709494A1 - Periodic signals synthesizer - Google Patents

Abstract

The invention relates to radio engineering and can be used in the synthesis of signals of optimal shape with given spectral characteristics. The purpose of the invention is to reduce unwanted components in the spectrum of the output signals while simplifying the device. The Periodic Signal Synthesizer contains a master oscillator of 1, N drivers. '2i. . i 2m sequence of direct, coal pulses, shaper 3 envelope, filter 4, first frequency divider 5, add-subtractor (BDV) 6, second frequency divider 7, counting trigger 8. When summing in the shaper 3 the envelope of the pseudo-harmonic signals taken From the direct or inverse outputs of the counting triggers 8, it is possible to include in the output signal any harmonic component with a predetermined level and compensate for the unnecessary. 1 il.

Description

The invention relates to radio engineering and can be used in the synthesis of optimal form of signal with the desired spectral characteristics.

The aim of the invention is to reduce undesirable components in the spectrum of the output signals while simplifying the device.

The drawing is electrical. eka structural diagram of a periodic signal synthesizer.,

The periodic signal synthesizer contains a master oscillator 1, N formers 2i, 22,.;., 2s of the square pulse sequence, an envelope generator 3, a filter 4, each of the N formers 2i, 22, ..., 2y contains the first frequency divider 5, an addition-subtracting unit (BDV) 6, a second frequency divider 7, a counting trigger 8. The periodic signal synthesizer works as follows. The signal from master oscillator 1 is applied to the inputs of the first divider 5 and BDV 6 of each 1131 fyrmrrweli 2i; 22, .... 2y. The LRD 6 provides for the addition or removal of pulses from a sequence of pulses coming from the output of the master oscillator 1 at the appearance of pulses at the output of the first deditbl 5. The resulting pulse sequence is divided in the second divider 7 and fed to the input of the counting trigger 8, at the output of which the signal represents the efficiency of rectangular pulses with a duty cycle; equal to two, and the period of following

pulses corresponds to the period of one of the harmonic components of the output signal. Thus, the chains of the first splitter 5 in series of the frequency, the Airborne Forces 6, the second splitter of the 7-counting trigger 8 form shapers 2i, 222y.

In the general case, the number of formers 2i, 22. ..., 2m in the synthesizer must exceed the highest number of the harmonic component included in the spectrum of the generated signal, and the greater the excess, teM is lower than the requirement for filter selectivity 4, which in this case Designed as a low pass filter. From the outputs of the counting triggers, 8 all N formers 2i, 22, ..., 2s are signals in the form of sequences of square impulses of multiple frequencies (pseudoharmonics) of | ytc to the inputs of the former 3 envelope. The envelope shaper 3 is a group of attenuators operating on one adder (not shown). The pseudoharmonic signals from the output of each of the blocks of N formers 2i, 22, ..., 2m are fed to the input of their attenuator former 3 envelope. The synchronization of the leading edges of positive pulses of all higher pseudo-harmonics with the front of the positive impulse of the first pseudo-harmonic ensures the coincidence of the initial phases of all the harmonic components of the signal.

The spectrum of any pseudo-harmonic can be recorded as

f (t) | +2 | + li: | "-b + ....

(one)

where E is the pulse amplitude;

a Kutet t;

K is the pseudo-harmonic number.

From (1) it follows that the first pseudoharmonic can be represented as the sum of the constant component and all odd harmonics of the output signal carrier. Second pseudo-harmonic, except constant

component, contains harmonics, whose numbers are equal to twice the sequence of odd numbers, etc. The pseudoharmonic signals summed from the forward or inverse outputs of the counting trigger 8 can be included in the output signal of the harmonic with

specified level and compensation unnecessary. Uncompensated higher-order tarmones are suppressed by filters 4 connected to the outputs of the envelope former 3.

The use of counting flip-flops 8 not only reduces the material costs of manufacturing the device, but also greatly simplifies its adjustment, since the adjustment process is reduced to the selection of attenuation coefficients for attenuators entering the composition of the imager 3 envelope.

Formula I3: 0bns Synthesizer of periodic signals,

containing a master oscillator, successively connected envelope shaper and filter, as well as N formers of a sequence of rectangular pulses, each of which contain a first frequency divider, an add-subtractor and a second frequency divider, respectively, with the first frequency divider and the second input of the addition-subtraction unit of each of the N formers of a sequence of rectangular pulses is connected to the output of the master oscillator, in order to decrease no undesirable components in the output spectrum

signals when the synthesizer is simplified, a counting trigger is inserted into each of the N formers of a sequence of rectangular pulses, the input of which is connected to the output of the second frequency divider, and the trigger output of each of the N formers of a sequence of square pulses is connected to the corresponding input of the envelope former, and the filter is fil

tra low pass.

Claims (1)

Claim A periodic signal synthesizer containing a master oscillator, sequentially connected envelope shaper and filter, and N shapers of a sequence of rectangular pulses, each of which contains a first frequency divider, an add-subtract unit, and a series. a second frequency divider, while the input of the first frequency divider and the second input of the block * 'add-subtract each of N formers of a sequence of rectangular pulses are connected to the output of the master oscillator, so that in order to reduce undesirable components in the spectrum of the output signals, when simplifying the synthesizer, a counting trigger is introduced into each of the N formers of the sequence of rectangular pulses, the input of which is connected to the output of the second frequency divider, and the output of the trigger of each of the N ovateley rectangular pulse sequence is connected to the corresponding input of the envelope, and the filter is designed as a lowpass filI tra. t '/' g ’