SU702540A1 - Frequency manipulator - Google Patents

Description

(54) FREQUENCY MANIPULATOR

one

This invention relates to radio engineering and may be used in radio transmitting devices.

A frequency manipulator is known that contains a series-connected low-pass filter, a controlled oscillator, a divider with a controlled division factor, and a phase detector, to the second input of which the output of the reference oscillator 1 is connected.

However, this scheme has a higher level of out-of-band emission.

The purpose of the invention is to reduce the out-of-band emission level.

To do this, a frequency manipulator containing a series-connected low-pass filter, a controlled oscillator, a divider with a controllable division factor and a phase detector, to the second input of which the output of the reference oscillator is connected, are inserted in series with a pulse edge shaping unit and a key, a second input and the output of which is connected respectively to the output of the phase detector and the input of the low-pass filter; formation block outputs

the pulse edges are connected to the control inputs of a divider with a controllable division factor and a controlled generator, and an information signal is fed to the input of the pulse edge shaping unit.

5 The drawing shows the structural electrical circuit of the proposed device. The frequency manipulator contains a low-pass filter 1, a controlled oscillator 2, a divider with a controllable factor of 3, a phase detector 4, a reference oscillator 5, a pulse front shaping unit 6, and a key 7.

The device works as follows. When transmitting a unit or a zero, a divider with a controllable ratio of divisions 3 or 3, controlled by a signal from a pulse-shaping unit 6, has a division factor of N i or N o, respectively. Frequency at the output of controlled generator

 fyn foo-Nf or fyro fon-No, where fon -

 reference oscillator frequency 5.

Let the signal be zero. With his

Claims (2)

the change at the first output of the pulse edge shaping unit 6 signal changes so that the division factor accepts the intermediate value Ncp signal from the second output locks key 7. At the third output, the signal is an amplitude-calibrated and rounded signal (for example, with linear fronts of the duration). By t (j), TaK as a key 7 is open, the controlled generator 2 begins to smoothly tune in the right direction. After time 1f, the pulse-forming unit b gives signals that the division factor takes .. 1. The frequency controlled generator 2 must be fyr fyr, fonNi: Achen N (in accordance with the transmitted enclosure), and switch 7 is closed the two conditions, it is necessary to perform a ring was not transient in the time switch circuit 7.. 2. Phase phase signals at the inputs of phase detector 4 should be the same as in the static mode. Due to the very small relative adjustment of the controlled generator 2 (on the order of 10 -102), its control slope Syr can be considered constant. To satisfy both conditions, it is sufficient to take N ', iNi | MpJ, and DUB.F. (N, -No / Svr. This is true for any symmetric frequency variation law, for example, for cosine-quadratic, linear, step, and etc.). In case of inaccurate reception of DIB.f.p., The transition process proceeds, but With a small initial detuning (for example, 5% of the shift) the time to reach the nominal frequency of the controlled oscillator 2 is also short. When the information signal is reversed, the device works similarly. -. Thus, due to the gradual change in the frequency during manipulation, the level out-of-band emission, i.e., more information can be transmitted in the same frequency range. Furthermore, out-of-band emission in the proposed device is suppressed better than in the prototype. Formula of the Invention Frequency manipulator containing serially connected low-pass filter controlled a generator, a divider with a controllable division factor, and a phase detector, to the second input of which the output of the reference generator is connected, characterized in that, in order to reduce the out-of-band radiation level, c He introduced the series-connected pulse edge shaping unit and key, the second input and output of which are connected respectively to the output of the phase detector and the input of a low-pass filter, while the outputs of the pulse-shaping block are connected to the control inputs of a divider with a controlled Dividing factor and controlled generator ; and an information signal is supplied to the input of the pulse-shaping unit, Information sources taken into account in examination 1. French Patent No. 2250226, cl. H 03 C 3/16, 1976 (prototype).