SU1575217A1 - Device for reception of information with time division of channels - Google Patents

Abstract

The invention relates to a technique for transmitting information and is intended to extract channel signals from a group telemetry message with interval-pulse modulation and to detect synchronization failures. The invention can be used in separate telemetry systems, in particular, in atmospheric radiosonde systems. The purpose of the invention is to increase the reliability and simplify the device. The group telemetry message from the output of receiver 1 with the help of N - channel pulse distributor 2, where N is the number of channels in the system, is divided into channel signals. The synchronization channel with the minimum duration is searched by comparing the channel signal durations according to the principle of the next block 4 converting duration to amplitude with the minimum of the previous ones using block 4 converting duration to amplitude, D - triggers 5.1-5. N, multiplexer unit 6. The duration-to-amplitude conversion unit contains elements 2 and 9.1-9. N, converters 10.1-10, N pulse width to amplitude, keys 11.1-11. N. At the output of the comparison element 8, a synchronization signal is generated, the output signals of the device are formed by a block of multiplexers 6, at the outputs of which the channel pulses are arranged in a predetermined sequence. 6 Il.

Description

The invention relates to the transmission of information and can be used to extract channel signals from a group telemetry message with spacing-pulse modulation and to detect synchronization failures, as well as in various telemetry systems (in particular, in atmospheric radio sounding systems). Jq

The purpose of the invention is to increase the reliability and simplify the device.

Fig. 1 shows the structural scheme of the proposed device; on league. 2 is a schematic diagram of a pulse distributor; FIG. 3 is a schematic diagram of a pulse width to amplitude converter; in fig. 4 is a schematic diagram of a multiplexer block; in fig. 5 - time diagrams of device operation in the absence of interference; in fig. 6 - time diagrams of the device in the presence of interference.

The device contains a receiver 1, 25 distributor 2 pulses, an inverter 3, a block 4 converting duration into amplitude, D-triggers 5.1 - 5.N, a block of multiplexers 6, keys 7.1 - 7.N and element 8 compared to.

Block 4 contains the elements 2 And 9.1 - 9.N, converters 10.1-10.N pulse duration in amplitude / and keys 11.1 - 11.N.,

The distributor 2 contains a register 12, and the element OR NOT 13.

Each of the converters 10.1 - 10.N contains a charging key 14, whose information input is connected to a DC voltage source, and an output to an integrating RC circuit formed by a resistor 15 and a capacitor 16, in parallel of which the bit 17 is turned on. the key input 14 is the information input of the converter 10, and the control input of the key 17 is the reset input. The output signal is removed from capacitor 16.

The multiplexer unit 6 contains identical multiplexers 18.1 to 18.N, whose informational inputs of the same name are combined and are the informational inputs of the block. The control inputs of the multiplexers 18.1 - 18.N are connected to the control inputs of the block, with the jth input of the multiplexer

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I8.k is connected to the i-th input of the block so that i (j + k - 1) nod N.

The device works as follows.

From the communication channel, the transmitted information arrives at the acceptance input-. ka 1 where the selection of useful signals is made. At the output of receiver 1, a sequence of rectangular pulses of a group telemetry signal is formed, the telemetry frame of which contains N channel pulses, and the informative parameter of the channel signal is the duration of the time interval between the positive edges of adjacent pulses (Fig. 5 - Fig. 7).

One of the channel signals (e.g., the first) has a minimum duration and is a reference (synchronization channel). From the output of receiver 1, the group message arrives at the input of the distributor 2, at the outputs of which pulses are formed, the duration of which is equal to the informative time interval of the corresponding channel. Thus, the valve 2 divides the group telemetry message into channel signals.

The selected channel pulses successively arrive at elements 2 and 9.1 to 9.N, on the outputs of which rectangular reset pulses are formed, corresponding to the pause of the next channel signal in the group telemetry message.

As information signals for converters 10.1 - 10.N, the corresponding channel pulses from the output of distributor 2 are used. Converters 10.1 - 10.N convert the duration of channel pulses into the amplitude of voltage U, - U N. Output voltages of converters 10.1 - 10 .N through closed keys 11.1-11. (The i-th key closes the i + ka-i signal) is fed to the inverting input of the comparison element 8, to the direct input of which through the closed keys 7.1 to 7.N the voltage of the minimum and previous channels . i

If the voltage on the inverting

input element 8 comparison will be lower than non-inverting, then on

51

The output of the comparison element 8 will generate a logical unit signal. On the leading edge of the generated signal, an entry will occur in the D-triggers 5.1-5.N, and the trigger, the number of which coincides with the output number of the distributor 2, on which the minimum channel is present, will be written to the logical one, and the other triggers will contain zeros.

Since the sequence of channel following is known, after finding the reference (minimum) channel, it becomes possible to connect the outputs of the distributor to the device's outputs using the multiplexer unit 6 so that at the device outputs the channel signals are arranged in a predetermined sequence

Converters 10.1 - 10.N operate as follows. Before the channel signal arrives at the control input of the charging switch 14, the capacitor 1 is discharged through the middle bit-switch 17. With the arrival of the channel signal, the charge switch 14 is opened and the capacitor 16 starts to charge from the constant-voltage source through the switch 14 and the resistor 15 Upon completion of the channel signal, the key 14 is opened and the voltage U is stored on the capacitor 16, which is maintained until the next discharge pulse arrives.

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The proposed device (as compared with the prototype) is reliable in operation and simpler in design, and, moreover,

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Claims (1)

Invention Formula The device for receiving information with time division channels, the contents (its receiver, whose input is the information input of the device, the output of the receiver is connected to the input of the pulse distributor and through the inverter with the input of the duration-to-amplitude conversion unit, the outputs of the pulse distributor are connected to the corresponding inputs of the a duration-to-amplitude conversion unit corresponding to the inputs of the first group of a multiplexer unit; the outputs of a duration-to-amplitude conversion unit are connected to the inverse In addition to the input element of the comparison, D-flip-flops, the outputs of which are connected to the corresponding inputs of the second GROUP of multiplexers, the outputs of which are the outputs of the device group, characterized in that, in order to increase the reliability and simplify the device, keys have been entered into it, the direct input of the reference element, the output of which is connected to the synchronization inputs of D-flip-flops, whose information inputs are connected to the corresponding outputs of the pulse distributor, the outputs of the conversion unit group the amplitude and D-flip-flops are connected respectively to the first and second inputs of the corresponding keys, the output of the comparison element is the output of the device. (Rig 2 R Figz M t sh M Fm Input line Output W Sf / Jieff ft Exit 61 exit 62 S3 output Fm5