Apparatus for forming dual-frequency signals and four-photon telegraphy

 

(57) Abstract:

Usage: electronics. The inventive device comprises a reference oscillator 1, multidrop, the frequency divider 2, the accumulating adder 3, two memory block 4,7, d / a Converter 5, the low pass filter 6, the driver code sequence 8, the encoder 9. 1 Il.

The invention relates to electrical engineering and can be used in a transmitting apparatus Telegraph.

Known frequency modulator containing a reference oscillator, a binary counter, reversible counter, a binary adder, the unit's permanent memory, digital to analog Converter and low pass filter [1]

However, the modulator does not provide sufficient suppression of out-of-band radiation generated signals, including signals four-photon telegraphy.

The closest in technical essence to the invention is a device for generating signals of frequency and dual-frequency telegraphy containing reference generator, multi-tap frequency divider, encoder, frequency divider, a low-pass filter, digital Converter, the shaper pulse [2]

However, the second frequency.

The objective of the invention is to improve the accuracy of formation of the Telegraph signals.

This object is achieved in that the forming device of the dual-frequency signals and four-photon telegraphy, containing the lowpass filter, encoder, connected in series reference generator and multi-tap frequency divider input a second memory block, the driver code sequence, connected in series accumulating adder, the first memory block and a digital to analog Converter whose output is connected to the input of the lowpass filter, with code inputs accumulating adder connected to the outputs of the second memory block, the inputs of which are connected to the driver code sequence, the control inputs of which are connected to the outputs of the encoder, and clock inputs of accumulating adder and shaper code sequence is connected to the outputs of the multi-tap frequency divider.

The proposed solution meets the criteria of the invention "novelty" because it differs from the prototype by the presence of new functionalities and new relationships between the elements.

The drawing shows structurn the accumulating adder; 4, the first memory block; 5 d / a Converter; 6 low pass filter; 7 second memory block; 8 - shaper code sequence; 9 encoder.

The device contains a filter 6 lower frequencies, the encoder 9, connected in series reference oscillator 1 and the tap of the divider 2 frequency. Additionally, the second block 7 memory, driver 8 code sequence, connected in series accumulating adder 3, the first block 4 memory and d / a Converter 5, the output of which is connected to the input of the filter 6 of the lower frequencies, while the code inputs accumulating adder 3 is connected to the outputs of the second memory block 7, the input of which is connected to the imaging unit 8 code sequence, the control inputs of which are connected to the outputs of the encoder 9, and the clock inputs of accumulating adder 3 and the imaging unit 8 code sequence is connected to the outputs of the tap of the divider 2 frequency.

The device operates as follows. The manipulation signals according to the first and second inputs are received at the encoder 9, which generates the control signals for the driver 8 code sequence.

In steady state, when the new sequence is set in one of the fixed state, code at the output of the shaper 8 code sequence that identifies the address of the second memory block 7 is not changed and the entrance is accumulating adder 3 enters code a fixed number.

Accumulating adder 8 with a clock frequency of coming at him with a tap of the divider 2, increasing its value by the value of the code number, coming at him from the second memory block 7, which leads to a uniform increment the phase of the output signal. In the first block 4 memory is converting the code phase of the code in amplitude, and the output device after digital to analogue Converter 5 and filter 6 lower frequency sinusoidal signal is produced, the frequency of which is equal to the characteristic set of signal manipulation and different from the average frequency for one or three deviation.

In any other set of input signals module account shaper 8 code sequence is set in another fixed state, which leads to the establishment of a new code number input is accumulating adder 3, and education at the device output signal whose frequency is equal to the characteristic for the newly installed signals manipulation.

When ISM is goes from a fixed state and starts counting clock pulses. At the output of the shaper 8 code sequence is formed by a sequence of codes that specify the variable value code number input is accumulating adder 3 and uneven increment the phase of the output signal during the transition process. The law of variation of the phase is determined by the second memory block 7.

At the end of the transition process on the output device is set to the new frequency.

The accuracy of the signal is determined by the clock frequency is accumulating adder, the number of bits of the first block 4 memory and digital to analogue Converter.

Apparatus for forming dual-frequency signals and four-photon telegraphy, containing the lowpass filter, encoder, connected in series reference generator and tap the frequency divider, wherein the entered serial connected accumulating adder, the first memory block and d / a Converter, and a second memory block, the driver code sequence, and the output of the digital to analogue Converter is connected to the input of the lowpass filter, code inputs accumulating adder connected to the outputs of the second b the s of which is connected to the outputs of the encoder, and clock inputs of accumulating adder and shaper code sequence is connected to the outputs of the tap of the divider frequency.

 

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