SU643944A1 - Adaptive switch apparatus - Google Patents

Description

(54) ADAPTIVE SWITCH

The adaptive switch is in the field of telemechanics. It can be used in data acquisition devices, in multi-channel measurement, monitoring and control systems, including telemetering systems to reduce the redundancy of switched data.

Adaptive switches containing keys, an information analyzer, summation, division, and comparison units are known to reduce the redundancy of measurement data fi.

A disadvantage of the known switches is the significant data redundancy in the transmitted messages.

The closest in technical essence is an adaptive switch containing an information analyzer whose input and the first input of the switching unit are connected to the input of the adaptive switch, a summation unit, the outputs of which are connected respectively to the first input of the division unit and the input of the clock determining unit, the first output unit switching is connected to the first output of the 14 adaptive switch 2

A disadvantage of the known adaptive switch is its long adaptation time to the switched signal, low measurement accuracy and technical complexity of the hardware implementation.

 The aim of the invention is to improve the accuracy and speed of the adaptive switch.

This goal is achieved by introducing a program selection block, a program storage block, a multichannel generator, an address storage unit and a variational frequency conversion and channel grouping unit, the input of which is connected to the output of the information analyzer, the first output connected to the input of the summation unit and the second

 the input of the division unit,., the output of which is connected to the input of the program selection block, the other input of which. The first and second inputs of the multichannel generator are connected respectively to the outputs of the clock determining unit and the nporpaMhvM selector unit, the second output of the variational frequency conversion and channel grouping unit is connected to one input of the address memory unit, the other input of which connected to the output of the multichannel generator, the first output of the address memory unit is connected to the second input of the switching unit, and the second output is connected to the second output of the adaptive switch ra. The drawing shows a block diagram of a device that contains: information analyzer 1, switching unit 2, variational unit 3, frequency conversion and channel grouping summation unit 4, division unit 5, address storage unit 6, clock frequency determination unit 7, multichannel generator 8, block. 9 in the program selector, program storage unit 10. -., The Adaptive Switch operates as follows. A set of n measuring signals; no.) 32 continuously enters via P channels from the installed on the object of study to: yes. Tchikov on the information analyzer 1, which method (analog or discrete) P. On the caddom of the channels will determine the required polling frequency. . The block of variational frequency conversion and grouping of channels 3 continuously arranges channels according to the values of frequencies ijj (for example, in order of decreasing values of iJ) and divides the ordered set {; 1 into tons of equal groups by channels in the group. At the same time, the channel address codes (channel numbers) in the order of their following are recorded in the address storage unit 6. The variation conversion unit and the grouping of the channels 3 are alternately for; The player from the n channel groups finds the Maximum of the required polling frequencies of the channels included in this group — this, in accordance with the ordering principle, the polling frequency of the first channel in the group — let's calculate it x | . as a result, the individual polling frequency of each channel in the j - th group i .; is replaced by a group frequency of 1 j, the same for all channels in the j -th group and their maximum initial value, 5 r ;. , S + K. Thus, the block of the variation pattern of the formation, and the grouping of channels 3 forms a set of necessary group polling frequencies. This provides a reduction in the dimension of the initial set of necessary frequencies from n (the number of channels) to m (the number of groups of channels), which simplifies the optimization of the polling program and reduces the associated hardware costs. The required error in the recovery of the signals of all the channels of the No group is greater than the specified one, since the channels are now polled with the maximum frequency for the groups forming the channel group. From the output of block 3, the signals tL are fed to the summation block 4, which determines the total group frequency lo.Eij and the clock frequency required for polling the switch. Sh l d. where k - the number of channels in the group. From the output of block 4, Sd1 signal, proportional to io i, is fed to division unit 5, in which from these signals and from signals proportional to ij, from the output of the variational conversion and channel grouping unit 3, signals are generated that are proportional to the relative required polling frequency of channel groups 01 jij / Jo, j 1.0. . The output of block 4 of the signal, proportional to the clock 4iacTOTe of the polling f, is fed to the block of determining the clock frequency 7, where the closest possible value of the allowed clock frequency f & f is selected. From the output of block 7. a signal, which is a sequence. Pulses following with a frequency ± are fed to a multichannel generator 8. In the storage unit, the software contains sets of acceptable polling frequencies b 37 g, i.e. survey programs. The values of bj satisfy the conditions:: - integer, number), .Е ibjsl. This makes it possible to interrogate groups of channels evenly at different frequencies of access to different groups of channels and to obtain at the output of switch 2 a uniformly filled sequence of samples. The program selection block .9 compares the signals arriving at its inputs from the outputs of block 5 and block 10, which are proportional to the sets, respectively; i3T i selects the set b ;, the closest (by a given criterion) to the original set e (j3 T Comparison of the sets aj3 T fbjjf in block 9 can in the simplest case be done, for example, coordinatewise, i.e. the same members of these sets are compared with a certain comparator, starting with the first and the sum of the differences of like members of the sets. accumulates in some register , Then compared sleduk tsyy set 1 closest to a given set is a set of L W, for which this sum of differences is the least.

Signals proportional to the selected polling frequency set bj3 / are output from the program selection block 9 to the multichannel generator 8, where its outputs corresponding to these values of j are opened. The multichannel generator is also supplied with a sequence of polling pulses with a clock frequency i from the clock determining unit 7

A set of m sequences of polling pulses of groups of channels ifj from the output of multichannel generator 8 is fed to an address storage unit 6, where these pulses alternate polling addresses of channels by groups. Accordingly, the frequency of polling the address of any channel of the j -th group Кij will be: t (the number of channels in the group).

Thus, at the output of the block of memory-addresses b, the addresses (non-codes) of the channels Wj appear, the following s.frequencies and these frequencies are best matched with the necessary polling frequencies ij of these channels. The coded addresses of the channels Ni are fed to the switching unit 2, where the closure of the corresponding channel calls is controlled. At the output J of the switching unit 2, alternately measured analog signals x (Ai-E) appear, and at the output C, the coded channel addresses in groups for recording the changes of the polling program.

Aligning an adaptive switch will ALLOW minor hardware costs to increase measurement accuracy and shorten the adaptation time to a switched signal.

Claims (1)

1. USSR author's certificate No. 447838, class, H 03 K 17/04, 1973, 2, CJCCP Copyright Certificate No. 335711, cl. 008 C 19/16, 1969-, ()} S T W , Wilow jf Vyko