SU720677A1 - Frequency modulator - Google Patents

Description

(54) FREQUENCY MODULATOR

one

The invention relates to communication technology and can be used in a device. transmission of analog signals by the frequency modulation method,

The closest to the proposed technical essence and the achieved result is a modulator, which includes in its composition a series-connected master oscillator and a unit for forming a series of pulses, one of the outputs of which is connected to the first input of the OR element, as well as a latitudinal modulated unit iMg yosov, the output of which through the element I is connected to the second terminal; The second element OR, the second output of the steam generation unit (}) of the sequences of pulses is connected to the second input of the AND element, and the output of the OR element is connected to the input of the control healer for an hour; the output of which is connected to one of the inputs

the formation of broad-modulated pulses

The lack of a known device is not enough wide dynamic range.

The purpose of the invention is to expand the dynamic range of the frequency modulator,:.

The goal is achieved by

H

that in a frequency modulator containing a block (paraphase sequences, the input of which is connected to the output of the master oscillator, and the first and second flashes are connected respectively to the first input of the OR element and

5 to the first input of the element And and the block ({the width-modulated pulse modulation, the output of which is connected to the second input of the said element And, the output of the element And is connected to

0 to the second input of the OR element, and the output of the OR element is connected to the input of the controlled, divider, the sampling frequency divider is entered, whose input

connected to the output of the master oscillator, and the output is connected to the start input of the block forming pulse-width modulated pulses and, via a coding pulse formter, with the first input of the zero-organ whose second input is connected to the input of the modulating signal and the output forming neurally modulated pulses.

The drawing shows a functional diagram of a frequency modulator.

The device described in ciBoeKi consists of a master oscillator 1, a unit 2 for generating paraphase pulse sequences, a divider 3 sampling frequencies, an element OR 4, a component AND 5, a controlled divider 6 frequencies, a block 7 for generating coding pulses, a block 8 for generating width-modulated pulses null organ 9. At the same time, the output of the master oscillator 1 is connected to the inputs of the unit 2 for the formation of paraphase pulse sequences and the divider 3 for the sampling frequency. The first and second outputs of the unit 2 for the formation of paraphase pulse sequences are connected respectively to the first input of the element OR 4 and to the first input of the element AND 5, The output of the element РИЛИ 4 is connected via a controlled frequency divider to the outputs of the modulator. Further, the output of the divider 3 of the sampling frequency is connected to the input of the coding pulse generation unit 7 and the trigger input of the spacing modulated generation unit 8. The output of the coding pulse generation unit 7 is connected to the first input of the null organ 9, the second input of which is connected to the input of the modulating signal. The zero-organ output 9 is connected to the reset input of the pulse-width modulation forming unit 8, the output of which is connected to the second input of the And 5 element.

Frequency modulator works as follows.

The reference frequency oscillations produced by master oscillator 1 are fed to the input of the paraphase pulse sequence formation unit 2, which forms two pulse sequences that are shifted relative to each other by half of the follow-up period. The reference frequency oscillation is also applied to the divisor 3 of the sampling frequency

the output pulses of which are fed to the input of the block 7 for the formation of coding pulses and to the input of the start of the block 8 for the formation of width-modulated

th signal. From each input pulse 7, a coding pulse is formed, the shape of which is determined by the given encoding law of the instantaneous values of the modulating signal.

The output pulses of block 7 are fed to the first input of the null organ 9, to the second input of which a modulating analog signal is fed. When the voltages applied to the inputs of the nullorgan 9 are equal, the successive pulse generates a pulse, which is fed to the reset input of the wide-pulse generation unit 8. Consequently, the beginning and end of the pulse at the output of block 8 is determined by the moment the pulse arrives at the start input and the moment the pulse arrives at the reset input.

Thus, the duration of the pulses at the output of block 8 depends on the level of the modulating analog signal and on the adopted non-linear coding law, specified by block 7

coding pulses. The latitudinal-modulated pulses from the output of block b are fed to the second input of element 5, and to its first input one of the paraphase sequences formed by block 2 is fed. The second sequence formed by block 2 is fed to the first input of element 4, to the second KOToJDorO input is shifted halfway through

a sequence of pulses consisting of groups that follow at the sampling frequency from the output of the And 5 element. The number of pulses in each group depends on the width of the pulse, measured by the unit

8. Thus, in the sequence of pulses arriving at the input of the controlled frequency divider b periodically, with the sampling frequency, the number of pulses is added, corresponding to

the level of the modulating analog signal and determined by a given nonlinear coding law. This leads to a periodic shift in the phase of the output pulse control sequence.

dividing divider; A periodic phase shift of a sequence of pulses is equivalent to a change in the frequency of the signals} ia the output of the frequency modulator. The described frequency modulator, in comparison with the known one, has a wider dynamic range ffpH of a given accuracy of the transmission of an analog signal. The formula invented is a frequency modulator containing a paraphase sequence forming unit whose input is connected to the output of the master oscillator, and the first and second outputs are connected respectively to the first input of the OR element and to the first input of the AND element and the forming unit of width-modulated pulses whose output is connected with the second input of the said element AND, and the output of the element AND is connected to the second input of the element OR, and the output of the element or connected to the controlled divider passage, which differs from, o, in order to broaden the dynamic range, a sampling frequency divider is introduced into it, the input of which is connected to the output of the master oscillator, and the output is connected with the start of the GWP pulse forming unit and, via the encoder, with the first input zero There is a jurgan, the second input of which is connected to the input of the modulating signal, and the output is connected to the reset input of the said block of the formation of pulse-width modulated pulses. Sources of information taken into account in the examination 1. USSR author's certificate 314279, cl. H 03 C 3 / O6, 5.01.70 (prototype).

Claims (1)

Claim A frequency modulator containing 1 paraphase sequence forming unit, the input of which is connected to the output of the master oscillator, and the first and second outputs are connected respectively to the first input ^{of the} OR element ¹ and to the first input of the AND element and the pulse-width modulated pulse generating unit, the output of which is connected to the second input of the said AND element, and the output of the AND element is connected ²¹ to the second input of the OR element, and the output of the OR element is connected to cc> the input of the controlled divider, distinguish-. This is due to the fact that, in order to expand the dynamic range, a sampling frequency divider is introduced into it, the input of which is connected to the output of the master oscillator, and the output is connected by the trigger unit of the formation of pulse-modulated pulses and, through the coding pulse shaper, with the first input of the zero-organ, the second input of which is connected to the input of the modulating signal, and the output is connected to the reset input of the said block for generating pulse-width modulated pulses. ''