SU949846A1

SU949846A1 - Multichannel signal receiver

Info

Publication number: SU949846A1
Application number: SU792708001A
Authority: SU
Inventors: Борис Феопемптович Журавский; Ирина Ювенальевна Потапова; Борис Иванович Кухтик
Original assignee: Ленинградское Отделение Центрального Научно-Исследовательского Института Связи; Предприятие П/Я М-5308
Priority date: 1979-01-05
Filing date: 1979-01-05
Publication date: 1982-08-07

Description

Изобретение относитс к электросв зи и может быть использовано в аппаратуре передачи информации многочастотным равновесным кодом р из п.The invention relates to telecommunications and can be used in the equipment for transmitting information by the multi-frequency equilibrium code p from p.

Известен многоканальный приемник сигналов, содержащий п цепей из последовательно соединенных фильтра, детектора и вычитаюв1его блока (где п - число принимаемых сигналов) и усилитель, выход которого подключен к входам фильтров С Однако известный многоканальный приемник сигналов имеет недостаточную помехозащищенность.A multichannel signal receiver is known that contains n circuits from a series-connected filter, a detector and a subtraction unit (where n is the number of received signals) and an amplifier whose output is connected to the filter inputs C However, the known multichannel signal receiver has insufficient noise immunity.

Цель изобретени - повышение помехозащищенности .The purpose of the invention is to improve the noise immunity.

Поставленна цель достигаетс тем, что в многоканальный приемник сигналов , содержащий п цепей из последовательно соединенных фильтра, детектора и вычитающего блока (где п число принимаемых сигналов) и усилитель , выход которого подключен к входам фильтров, введены m блоков управлени , m формирователей порогового напр жени и m делителей напр жени , причем первые входы блоков управлени соединены с выходами соответствующих детекторов, выходы блоковThe goal is achieved by the fact that m multi-channel controllers, m threshold voltage drivers are entered into a multichannel signal receiver containing n circuits from a series-connected filter, detector and subtraction unit (where n is the number of received signals) and an amplifier whose output is connected to the filter inputs. and m voltage dividers, with the first inputs of the control units connected to the outputs of the respective detectors, the outputs of the blocks

управлени соединены с входами соответствующих формирователей порогового напр жени , первый и второй выходы которых соединены соответственно с дополнительным входом соответствующих вычитающих блоков и входами соответствующих делителей напр жени , выходы которых подключены к вторым входам блоков управлени предыдущих и последующих цепей.Controls are connected to the inputs of the corresponding threshold voltage drivers, the first and second outputs of which are connected respectively to the auxiliary input of the respective subtraction units and the inputs of the corresponding voltage dividers, the outputs of which are connected to the second inputs of the control units of the previous and subsequent circuits.

На фиг. 1 приведена структурна схема предлагаемого устройства дл разных значений (п 6, m 3) ; на фиг. 2 - то же, (п m 6).FIG. 1 shows a block diagram of the proposed device for different values (clause 6, m 3); in fig. 2 - the same, (n m 6).

Приемник содержит входной усилитель 1, тракты приема токов рабочих частот, в каждый из которых вход т полосовой фильтр 2, детектор 3 и вычитающий блок 4, включенные каскадно вслед за каждым из полосовых фильтров 2, объединенные в m групп, например по два или по три, общим дл группы блоком 5 управлени формирователем 6 порогового напр жени и делителем 7 напр жени .The receiver contains an input amplifier 1, paths for receiving operating frequency currents, each of which includes a band-pass filter 2, a detector 3 and a subtractive unit 4, connected in cascade with each of the band-pass filters 2, combined into m groups, for example, two or three common to the group by the control unit 5 of the driver of the 6 threshold voltage and voltage divider 7.

Claims

The number of reception paths in a group depends on the requirements for the receiver operation conditions. The greater the length of the lines through which the receiver reliably receives signals, the smaller the reception paths in the group, i.e. the greater the number of groups. In this case, the imbalance of the current frequency levels by the adjacent groups is reduced, and reception conditions are facilitated. Extremely high receiver sensitivity is obtained when the groups are reduced to a single receive path. The device works as follows. Frequency parcels transmitted by currents n, for example, six frequencies (700, 900, 1100, 1300, -1500,1700 Hz) from which p, for example, two frequencies (any) are transmitted simultaneously, arrive at the receiver input (Fig. 1). In accordance with this, the receiver contains six filters 2, six detectors 3 and six subtractive blocks 4, divided into three groups, each with two paths. The number of groups is chosen to be three in order to obtain the required receiver sensitivity (the attenuation of the connecting line is in this example 19.2 dB). Each group has its own threshold voltage driver control unit 5, threshold voltage driver 6, connected via voltage divider 7 to control units of neighboring groups. The threshold voltages in each group are formed in accordance with the maximum envelope of the signal in this group, and through voltage dividers 7 are applied to other groups. If the receiver receives frequency bursts containing currents of frequencies that are in the same group, for example, 700 and 900 Hz, the corresponding driver 6 of the threshold voltage through the voltage divider 7 supplies the control unit 5 of the adjacent frequency group (1100 and 1300 Hz ) the lower voltage that is used to form the threshold voltage in this group. From the driver 6 of the threshold voltage of this group, through the corresponding voltage divider 7, the lower voltage is supplied to the block 5 of the control by the driver of the threshold voltage of the third group of frequencies 1500 and 1700 Hz. If frequency receptacles are received at the receiver, containing currents of frequencies lying in different groups, for example, 700 and 1700 Hz, then in each group, a threshold voltage is formed by its driver 6 of the threshold voltage in accordance with the level of the current of the incoming frequency. The threshold voltage, formed by a group containing a frequency of 700 Hz, through voltage dividers 7, is supplied to control units 5 of the threshold voltage conditioners in the other two groups. The threshold voltage, formed in the group containing the frequency of 1700 Hz, through the corresponding voltage dividers 7 is also fed into the control unit 5 of the threshold voltage formers in the other two groups. The threshold voltages thus generated are always less than the voltages at the outputs of the respective detectors 3 containing the useful signal, and at the same time they exceed the voltages at the outputs of the other detectors 3, which are perceived as interferences. Under these conditions, it is ensured that all frequency messages arriving at the receiver input are securely fixed. The receiver, in which the control unit of the threshold voltage driver and the threshold voltage driver are made individual for each reception path (Fig. 2), also works similarly to the receiver under consideration (Fig. 1). Claims of the invention A multichannel signal receiver comprising n circuits of series-connected filters, a detector and a subtracting unit (where n is the number of received signals) and an amplifier whose output is connected to filter inputs, characterized in that, in order to improve noise immunity, m control units, m threshold voltage formers, and m voltage dividers, the first inputs of the control units connected to the outputs of the respective detectors, the outputs of the control units connected to the inputs of the corresponding threshold voltage formers, the first and second outputs of which are connected to an additional, respectively. the input of the corresponding subtracting units and the inputs of the corresponding voltage dividers, the outputs of which are connected to the second inputs of the control units of the preceding and subsequent circuits. Sources of information taken into account during the examination 1. USSR author's certificate W 362496, cl. H 04 B 1/10, 1970 (pro-, totip).

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