SU970721A1 - Device for forming amplitude modulation signals - Google Patents

Description

(54) DEVICE FORMATION OF AMPLITUDE SIGNALS

MANIPULATIONS

This invention relates to radio engineering. A signal shaping device for amplitude manipulation is known, which contains a source of manipulated signals, sequentially connected source of manipulating signals, a controlled phase shifter, an adder and a key, the second input of which is connected to the output of the extender of manipulating signals Cl. However, in the known device, there is no complete suppression of the carrier signal and insufficient suppression of out-of-band measurements of the output signal. The circuit of the invention is the complete suppression of the carrier signal in the pauses between the manipulating signals. This goal is achieved in that the amplitude manipulation signal shaping device containing the source of the manipulated signals, the sequentially connected source of the manipulating signals, controlled phase rotation, the adder and the key, the second input of which is connected to the output of the pulse extender. One input of which is connected to the first output of the source of the manipulating signals, a frequency divider is introduced, and the second output of the source of the manipulating signals is connected to one input of the source of the manipulated signals. The other input is connected to the output of the pulse puller, the other input of which is connected to the second output of the adder, the output of the source of the manipulated signals is connected to the third input of the switch and via a frequency divider to the second input of the controlled phase shifter. FIG. 1 shows a structural electrical circuit of the proposed device; in fig. 2 t timing diagrams explaining the operation of the device. The device contains a source of 1 manipulating signals, a source of 2 manipulated signals, a divider of 3 frequencies, a controlled phase shifter 4, an adder 5, expand 6 impuses, a terminal 7. The device operates as follows. The signal of the source 1 of the manipulating signals (Fig. 2d.) Triggers the source 2 of the manipulated signals (Fig. 2b). Separate the frequency in depot 3, the signal of the source 2 clocks the controlled phase shifter 4, which carries out the phase shift of the manipulating signal according to a given law (Fig. 2c ,: J, 3, G). In the adder 5, the shifted signals are added (Fig. 2g), forming the envelope of the output signal. The falling edge of the most shifted signal forms a stop pulse for the pulse expander 6. The start pulse is formed from the leading edge of the manipulating signal. The same falling edge disrupts source 2.. A strobe with an extension of 6 imps (Fig. 2e) controls key 7; it passes the carrier signal to the control input of the key. Its input signal is fed to the Pineyn1 signal formed in the controlled phase shifter 4 and the adder 5 of the envelope. Thus, the CPU 7 does not change the amplitude of the carrier signal according to the law of the envelope, as a normal modulator, but passes the output of the envelope signal to the moments corresponding to the carrier frequency pulses (Fig. 2tt).

The second half-wave output signal can be formed by any transformer or choke cascade (Fig. 2k.).

This organization of the operation of the controlled key completely eliminates any distortion of both the envelope signals and the carrier, since the wedge performs linear transformation of the envelope signal into an amplitude-manipulated output signal.

In addition, since the proposed device doubles the gating of the carrier signal (in the

do manipulating signals, introduced a frequency divider, the second output of the source of manipulating signals connected to one input of the source of manipulated signals, the other input of which is connected to the output of pulse extensions, the other input of which is connected to the second output of the adder, the output of the source of manipulated signals is connected to the third input of the key and through a frequency divider with the second input of the control phase shifter.

Sources of information taken into account in the examination

Claims (1)

1. USSR author's certificate No. 720674, kp. H 04L 27/02, 1978 (prototype) point 2 and key 7), the presence of a carrier in the output signal during pauses is completely excluded: even if the zero level of the gate is not completely locked, the control key is not in a pause, the signal of the carrier frequency penetrate the output signal - in the pauses between the manipulating signals, there is no generation of the carrier signal. Thus, the proposed device makes it possible to completely suppress the carrier signal in the pauses between the manipulating signals and reduce the out-of-band emissions of the output signal. Formula of an Invention Shadow Amplitude manipulation signal shaping device containing a source of manipulated signals, serially connected source of manipulating signals, controlled phase shifter, adder and key, the second input of which is connected to the output of the pulse expander, one input of which is connected to the first output of the source of manipulating signals, different so that, with a chain of complete suppression of the carrier signal in the pauses