CS909085A2 - Connection for system carrier signals, line pilot frequencies and channel carrier pilot frequencies formation - Google Patents

Description

BACKGROUND OF THE INVENTION The invention relates to a system for generating system carrier signals, line pilot frequencies, and channel carrier control frequencies for multi-channel telephone lines with overhead lines. A large number of carrier frequencies are required to modulate the carrier-frequency device over the overhead line, as different frequencies need to be allocated within the line bundle according to CCITT recommendations.

The overhead line system with the largest number of channels is a 12-channel system where seven system carrier frequencies and four pilot frequencies need to be created.

The carrier frequencies are those that do not immediately create the most common multiple of 4 kHz and these, starting from 4 kHz.

As is known, there are various carrier frequency generating devices consisting of highly stable oscillators, frequency multipliers, frequency dividers, modulators, and filter amplifiers. These connections are adapted to modern technology in various ways. Frequently, frequency dividers, filter making and thermostats are complicated and expensive to implement. As a result, when assessing the technical and economic level of a device, the number and the associated assignments are critical. In the known prior art solutions, the carrier frequency unit, see below in FIG. 1, is designed such that one of the modulator control oscillators and the frequency multiplier is allocated depending on the assignment of the four-frequency frequencies. The multiplied signal leads to a frequency divider with different split ratio. The output of the divider always appears in the 4 kHz pulse series, which controls the first harmonic generator, the third harmonic is the bandpass filter. The second harmonic generator is connected to the output of the bandpass filter. The channel carrier frequency output is also connected to the output of the first harmonic generator. Various system carrier frequencies appear at the outputs of the other bandpass filters, of which one can also be routed to a modulator that mixes it with the output signal of one of the control oscillators. From the modulator output spectrum, a different system carrier frequency of the signal beam is selected by the bandpass filter according to the frequency allocation of the lines. The pilot frequency is generated by separate oscillators.

According to HU-PS 179348, which is also related to the present techniques, all the necessary frequencies can be generated from a single oscillator signal. The essence of this solution is that the frequency oscillator combination is connected to the control oscillator while the individual system carrier signals and the pilot frequency as well as the output 3? connected by the frequency divider output. Other system carrier frequencies and pilot frequencies are generated by modulation. The output amplifiers will not be described and illustrated in the above-mentioned connections, which are present at the current level of technology or in accordance with the invention, because they do not form the sixth. In the former, there is a lack of oscillators. The frequency determining element, the quartz-crystal oscillator, must be placed in the thermostat so that the solution is very expensive. The necessary frequency accuracy can only be ensured with difficulty.

The drawback of the latter solution is that a large number of building elements is needed, making the implementation of the circuit very complicated and expensive. Particularly; The disadvantage is that the four systemic different carrier signals FBi. Fb ^ are formed by four different circuits, which is an uneconomical solution. SUMMARY OF THE INVENTION It is an object of the present invention to provide a signal generating circuit that meets the most stringent requirements of modern manufacturing and assembly technology and does not have the described drawbacks of known solutions. SUMMARY OF THE INVENTION The object of the present invention is to provide a connection for generating carrier signals that generate system carrier signals, line pilot signals, and channel carrier control frequencies for 12 channel devices 4 - 4 r, by continuous overhead lines from a single signal. the oscillator in such a manner that at the same time the number of sub-circuits used is substantially reduced, the sub-circuits being so simple that they can be pre-set in production. The solution according to the invention is based on the finding that of the seven-system carrier frequencies, only four are produced at the same time, which are generated by a switchable circuit. The solution according to the invention leads to simplification of the circuit and to a reduction of costs. This is advantageous for both production and evaluation. It is not necessary to know foreign systems operating in the same row, the line frequency position can be set on the spot with respect to crosstalk.

The subject matter of the invention will be elucidated hereinafter, with the explanation being explained in the description of FIG. 3.

The lower-band pilot frequency frequency FC1 of the central channel carrier frequency " control channel frequency " of the upper band " pilot frequencies " is formed directly from a single oscillator signal by integer division . The low band carrier system and the medium frequency carrier of the FK2 system are also produced by dividing, but the first harmonic, the third harmonic, is not filtered out of the right-angled signal. The carrier frequencies of the upper band system FB1 * FB2 * FB3 * FB4 and the pilot frequency of the upper band Ppj, PF2 are generated by modulating the frequency and auxiliary signals generated by the division. Auxiliary signals are signals that do not leave the system but are needed to produce output frequencies. The essence of the invention is that the output signal selection ratio of those frequency splitters that have a filter connected to the filter and that filter does not filter the first harmonic is 0.5 / 1: 1 rectangular signal at an output that leaves only odd harmonics /. The exception is the frequency divider 15: 1D6, in which the connected filter SZ4 filters the first harmonic. The filters are simplified in that their 1: 1 rectangular spectrum does not theoretically contain any even harmonic base signal.

The invention will now be described in more detail with reference to the accompanying drawings, wherein Fig. 1 is a block diagram of a known carrier signal generating device, Fig. 2 is a solution generating all frequencies from a single oscillator signal, while Fig. 3 is a solution according to of the invention.

As shown in Figs. 1, the oscillator signal V01 or V02 or V03 or V04 is obtained according to the four different link frequency frequencies designated I, II, III, IV to the modulator MD and to the frequency quadruple D5. The quadruple signal is fed to the D1 or D2 or D3 divider or D4 is the | 4 in the V01 oscillator to the D1 divider, the oscillator - 6 - V02 to the D2 divider and the like. At the D1 divider output. D2. D3. In any case, D4 will show a series of pulses of 4 kHz, which controls the harmonic generator G1, from whose spectra the bandpass filter SZ1 filters the third harmonic. From the spectrum of the harmonic generator G2 connected to the filter output SZ1, the filter SZ2 or the filter SZ3 is selected by the system carrier Fil 1 of the lower band or the system carrier pAa of the low band.

At the same time, the filter output signal SZ2 or filter SZ3 is also connected to the MD modulator. which mixes this signal with the signal of one of the V01 oscillators. V02. V03, V04. From the output spectrum of the MD modulator, the bandpass filter SZ5 selects the system carrier frequency FB1 of the upper band of the band-pass filter SZ6 by the system carrier of the upper band filter SZ7 by the system carrier frequency FB3 of the upper band and the bandpass filter SZS by the system carrier frequency of the Fgghor band. The pilot frequency P ^ of the upper band is formed by the pilot oscillator P01, the pilot frequency PB2 of the high band by the pilot oscillator Ρ02 pilot of the pilot frequency P dol of the lower band by the pilot oscillator P03. the pilot frequency P ^ 2 of the low band by the pilot oscillator P04, the pilot frequency PB3 of the high band by the pilot oscillator PO5 the pilot frequency Ρβ4 of the high band by the pilot oscillator P06 according to the line frequency plan. Ten different independent quartz oscillators are needed in this solution. At the same time, oscillators are needed to implement the line plan. 7

There is a solution in which all frequencies are generated from the signal of a single oscillator and such a solution is shown in FIG. 2. Two dividers are connected to the output of one control oscillator, one of which is an output, divider D14 connected to the output of divider B13. a ratio of 7: 1, with the splitter D14 having a split ratio of 4: 1, represents the output of the system carrier F1 of the lower band and, on the other hand, the input b of the modulator M4 forming the system carrier frequency FB4 of the high band.

The common D13 divider with the 7: 1 split ratio and the D14 divider with the 4: 1 split ratio is the D15 divider with a 3: 1 divider, the D16 divider with a 3: 1 divider is connected to a divider consisting of a divider D18 with a split ratio of 5: 1 and a splitter D19 with a split ratio of 2: 1, the output of which controls the output of the F ^ channel carrier, the output of the splitter D16 with a split ratio of 3: 1 is connected to the input of the splitter D25 with a split ratio of 2: 1 whose output breaks to four directions, to the D29 divider with a 8: 1 split ratio, D34 divider with a 2: 1 split, to M6 modulator input b, and a P ^ 2 pilot frequency output.

One output of the D17 splitter with a 2: 1 split ratio is connected to the N33 modulator input b and the 2: 1 divider 32 to the M5 modulator input b. The output of the second D20 divider with a 5: 1 split ratio connected to the control oscillator output 0 is divided into two directions: the D26 divider with a 4: 1 split ratio and the D21 divider with a 3: 1 split ratio. - 8 The D26 divider output with a 4: 1 split ratio is divided into four directives into a D28 input with a 2: 1 split ratio, a D30 divider with a 8: 1 split ratio, a D33 splitter with a 8: 1 split ratio, and a medium system load output. Fgg frequency · D21 divider output with a 3: 1 split ratio is connected to the D22 divider input with a 2: 1 split ratio, output of which is a medium system carrier output and connected to D23 divider with a 3: 1 splitter whose output is connected via D24 divider with a 2: 1 split ratio with D27 divider ratio of 8: 1, D31 divider with 2: 1 splitter and M4 modulator and splitter, D2 7, D29 splitter outputs with 8 split ratio : 1 forms the filter outputs S7, S8. The 8: 1 splitter D30 is connected to the input and the M3 modulator, while the D31 splitter to the 2: 1 split is connected to the input and the M5 modulator, the D33 splitter to 8: 1 is connected to the input and M6 modulator. The output of the splitter B28 with a split ratio of 2: 1 is connected to the input of the modulator M1, M2i. The outputs of the filters S7, S8 are connected by inputs and modulators M1, M2, modulators M1, Mg, M3, M4, M5 and M6 form the respective filters S1, S2, S3, S4, S5 and S6 of the system carrier frequencies Fg1 *. · ^ Ního4 the high band and the outputs of the pilot frequencies Ρθ ^, Ρβ2 of the high band.

FIG. 3 illustrates a circuit according to the invention for forming system carrier half-line pilot frequencies and control channel carrier frequencies for a multi-channel overhead line telephone device. To one output of the control oscillator 0, which at the same time forms the control output of the channel carrier frequency FCi, two divider divisions D1 with a split ratio of 7: 1 and a divider D2 with a split ratio of 40: 1 are output, the output of which outputs the center frequency FK1 of the system carrier. Three dividers are connected to the output of the divider D1, which at the same time forms the output of the control frequency of the channel carrier FC2, namely divider D3, 16: 1, whose output is connected to the output of the control frequency channel carrier and secondly to the filter input SZ1, further to the divider 4: 1 D4, whose the output is connected to the input M2 of the modulator and to the input of the divider D5 with the split ratio 3: 1 and the divider D6 with a split ratio of 15: 1 whose output is in-day to the switching point 12. D5 divider is connected to D7 divider input 2: 1 and M3 modulator input b :. The filter output SZ1 is the output of the lower band of the system carrier frequency F ^. The D2 divider output is also connected to four divider dividers, namely: D10 divider 4: 1, whose output is connected to D9 divider 2: 1 and switching point 4, to divider D12 4: 1, whose output is connected to the filter SZ6. to D13 divider 16: 1, whose output leads to filter SZ8 and to divider D14 2: 1, whose output is connected to filter input SZ2. The filter output SZ2 forms the output of the center frequency F ^ 2 of the system carrier. The D7 2: 1 output is coupled to the pilot frequency output of the PA2 bottom band, the switching point 6, the modulator input M4 - 10 - and the D8 divider input 2: 1, whose output is connected to the output of the low band PA1 pilot frequency and the switching point. 09 is connected to the switching points 1, 10. The filter output SZ6 is connected to the input and modulator M3, whose output leads to the filter input SZ7. The filter output SZ7 is the output pilot frequency PB1 of the upper band. The filter output SR8 is connected to the input and the modulator M4 is connected to the filter input SZ9. The filter output SZ9 is the output of the pilot frequency Pg2 of the upper band. The filter inlet SZ3 leads to the switching point 2, while the outlet of the filter SZ3 is connected to a visit and a modulator M1. The input b of the modulator M1 is connected by a switching point 5, while the output of the modulator leads to a clamping point 7.

The filter input SZ4 is connected to the switching point 8, while the filter output SZ4 is connected to the input and the modulator M2. The output of the modulator M2 is connected to the filter input SZ5. The filter output SZ5 is connected to the input of the divider Dli 2: 1.The divider output Dli forms the output of the system carrier frequency FB1 *** FB4 upper band *. It depends on the interconnection of the switching points 1 ... 12, which from the frequency appears on this output. In the case of the system carrier of the upper band, they are connected points 1-2, 5-6 and 7-8, in the case of the system carrier Fg2 the points 2-3, 4-5 and 7-8, in the case of the system carrier Fg3, the upper band points 8-9 and 10-11, and in the case of the frequency Ff4, the points 8-9 and 11-lM are connected between the unused switching points. are interrupted® · - 11

An essential advantage of the circuitry according to the invention is the minimum number of building elements compared to the known solutions 1 when, compared to Fig. 2, where the known connection is shown, the number of filters is one greater, this is compensated by the fact that the solution according to of the invention, the number of modulators used was reduced by two and the number of frequency dividers by eight. All the filters mentioned are simple and have a small number of elements. The SZ6 and SZ7 filters with the M3 modulator, the SZ8 and SZ9 filters with the M4 modulator and the SZ3 filter with the M1 modulator form units, thus significantly simplifying wiring. The advantage of using a single oscillator 0 is that only one thermostat is needed · Another advantage of multi-oscillator protisystems is that small frequency errors prescribed for carrier current devices, that is, high accuracy and stability, can be easier to achieve ·

Another advantage is the possibility to freely select the system bandwidth of the high band »; Frequency dividers can be created as integrated circuits, or preferably by means of MSI technology. Fig. 3 (solution according to the invention) Oscillator 10 1 1 Harmonic generator or frequency multiplier 3 0 0 Frequency divider 4 22 14 Modulator 1 6 4 Filter 8 8 9 Total 26 37 28 · * 12 *

Amplifiers that are on the outlets of individual circuits are not compared compared because their number depends on the embodiment. Therefore, amplifiers have not been considered as system requirements.

Claims (1)

OBJECT OF THE INVENTION TU / čig Involvement to create system carrier frequencies, line pilot frequencies for multi-channel overhead line carrier telephony devices, which is derived from a single oscillator, from a combination of frequency dividers following its output, to frequency converter output the filters of the connected filters, as well as the output of the connected filter modulators or frequency dividers associated with the filter output, wherein the outputs of the individual frequency converters are connected directly or via a filter to the control frequency outputs of the channel carrier or system carrier, respectively. lower pilot band frequency outputs, characterized in that the frequency divider combinations are connected to a house generating system carrier of the high bandwidth connected switchable and to the pilot frequency circuitry (FBI, PB2) of the high band that on o b-water generating system carriers (F ^ is derived from the serial circuit of the fourth filter (SZ4), the second modulator (M2), the fifth filter (SZ5) and the eleventh divider (011) with a split ratio of 2: 1, with one serial circuit forming a pilot the frequency (Ρβ1) of the bandwidth contains the sixth filter (SZ6), the third modulator (M3) and the seventh filter (SZ7), and one hay circuit producing another pilot band (Ρβ2) of the upper band consists of the eighth filter (S $ 8), the quad-modulator (M4) ) and the ninth filter (SZ9), ~ uXI O! dSťy f íp <! The wiring according to claim 1, wherein at least one of the input oscillators (0) which simultaneously represents the output of the channel channel carrier frequency (F 1) is connected two-frequency dividers (C1), namely the first divider (D1) 7: 1 and the second divider (D2) 40: 1, one output of the latter forming the output of the mean system carrier frequency (F1), further on one output of the first divider (D1) , which simultaneously outputs the second channel carrier frequency (FC2) control signal, three frequency splitters and a second 16: 1 splitter (D3) are connected, the output of which is connected by the output of the third channel carrier frequency control signal (Fqjj) and first with the first filter input (SZ1), the 4: 1 quarter divider (D4), whose output is connected to the second input (b) of the second modulator (M2) and to the fifth divider input (D5) 3: 1 and the sixth divider (D6) 15 : 1, whose output leads to twelfth switching point (12), the output of the fifth divider ID5) 3: 1 is connected to the input of the seventh divider (D7) 2: 1 and to the second input (b) of the third modulator (M3), one output of the first filter (SZ1) forming the output of the lower the system carrier frequency bands (F ^), the output of the second divider (D2) is connected by other four frequency dividers with the tenth divider D10) 4: 1, whose output is connected to the ninth divider (D9) 2: 1 and the fourth switching point (4) , with a tenth divider (D12) 4: 1, the output of which is connected to a sixth filter (SZ6), a thirteenth divider (D13) 16: 1, whose output is connected to the eighth filter (SZ8) as well as the fourteenth divider (D14) 2: 1, whose output 15 - is connected to the input of the second filter (SZ2), the output of the second filter (SZ2) is the output of the mean system carrier frequency (Fgg), the output of the seventh divider (D7) 2: 1 is the connection of the pilot frequency output (P ^) g) the second zone, the sixth switching point (6) ψ the second input b) the fourth modulator (M4) and the eighth divider input (D8) 2: 1, the eighth output (D8) 2: 1 is connected to the pilot frequency (P ^) output of the lower band and to the third switching point (3), followed by one output the ninth divider (D9) is connected to the first and the fifth switching point (1, 10), one output of the sixth filter (SZ6) is connected to the first input (a) of the third modulator (M3) and one output of the third modulator (M3) to the seven-speed filter input (SZ7), while the seventh filter output (SZ7) forms the high-frequency pilot output (Ρβ1), one output-filter (SZ8) leads to the first input vstupa) of the fourth modulator (M4) and one output of the fourth modulator (M4) leads one input of the ninth filter (SZ9), while one output of the ninth filter (SZ9) is the output of the pilot frequency frekvencePgg), one input of the third filter (SZ3) is connected by the second switching point (2), while the output of the third filter (SZ3) is connected to the first the input (a) of the first modulator (M1), the second input (b) of the first modulator (M1) connected to the fifth switching point (5) and the output of the first modulator (M1) with the seventh point (7), one quarterfile input (SZ4) is connected to the eighth switching point (8) and one output of the fourth filter (SZ4) to the first input (a) of the second - 16 - modulator (M2), one output of the second modulator (H2) is connected to the input of the fifth filter (SZ5) ), whose output is connected to the eleventh divider (011) 2tl> eleven output (011) is the output of the system carrier frequency (Fg) of the upper band 3 · 6. 1988 Z 2435 Z á £