SU1283949A1 - Multichannel non-recursive digital filter - Google Patents

Abstract

The invention relates to radio engineering and can be used in digital information processing systems. The purpose of the invention is to improve speed. Multichannel non-recursive digital filter (MKNCF) contains N-1 shift registers (PC) 1, N multipliers. 2, N-1 two-input adders 3, N-1 groups of 4 additional PCs. Each of groups 4 consists of K-1 PC 5. The input signal is a time-alternating sampling of signals from the K channels. PC 1 and PC 5 record storage and delay input: and intermediate time counts b. The multipliers 2 multiply the signal samples by a coefficient. impulse x-ki a, a, ... a. From the output of the first two-input adder 3, the filtered signal samples are passed to the MCPIF output. In the particular case, with dual channel filtering, each group 4 degenerates into one PC 5. At the same time, the signals of the first m of the second channels, t Il. I (L

Description

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with so

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The invention relates to radio engineering and can be used in digital information processing systems.

The purpose of the image: | Eteni - increase speed, 5

The drawing shows a structural electrical circuit of a multichannel recursive digital file.

The multi-channel non-recursive digital filter contains N-1 shift registers O 1, N multipliers 2, N-two-way adders 3, N-1 group 4 additional shift registers, each consisting of K-1 shift registers 5.

Multichannel non-recursive digital filter paPioTaeT c.tted.uimo obaspoM.

To the input of the m-octal cable is not connected; - a strong digital filter with a clock frequency of 1 / b 1 / (t / c), where t is a cyanide that is quantized by a 1–5 signal in each channel; .lov, which.rgs Alternate in sight. Shift registers 1 and registers 5 in groups of 4 additional shift registers provide storage and delay, respectively, of input calculations and npoMeaofTOHHbK results by time,

The multipliers 2 carry out, in principle, the calculation of the input signal samples by the coefficients of the impulse response a, a ,,,. , a, j respectively

Two-input adders 3 produce a summation of the results of multiplication from the outputs of multipliers 2 with the number of putochnyi. arriving from the outputs of the GR; / L.1 4 ADDITIONAL registers of the jinch, junction, and intermediate results from the outputs of the dzhohodov sumgatorov 3 are sent to the inputs of 1 p; / ng (4 (ds-half-triggered) registers of 5 shift C output first dvukhvhodovo.ro sung.Eator 3 samples of the filtered signals are fed to the output of the mass-channel non-.. recursive-T of the digital filter „

Each input (N - 1) of group 4 of the optional registers 5 receives the product of input samples by the filtering coefficient a.j with N-ro multiplier 2 ,.

Consider the operation of a multichannel non-recursive digital filter that processes input samples from two channels, Two-channel filtering each group

 ABOUT

50

35

40

45

4 additional shift registers, vyrozh; |, is in one register 5,

The input signal of a multi-channel non-recursive digital filter represents an alternating sequence of samples of the signals of the first x and second X channels. The signals x and x alternate in time so that the input is a sequence

X

, (t), x (t +1), x, (t + 2), x, (t + 3), .. x ,, (), x. (t-i-2N-1) (V)

etc., where the indices for x and x correspond to the reference number of the signal of the given channel.

At time t + 2 (N-1) at the input there is a signal x i ,, .- (t + 2N-2) at the output of the first-of register 1, 1 shift Xf ,. (t + 2N-3); on B1 1 in the second register 1.2 shift x ,,, .. (t-i-2N-4); at the output of the third register 1.3 shift X f,., (t + 2N-5) and t, d.

At the output of the first two-input adder 3.1 at this time (the output count + 2N-2 is formed)

N-1

(t-f

y „., (t: + 2N-2) x, a ,,

 +.,, + x

-х, а ,,, +

(2)

 ABOUT

At the output of the second two-input adder 3.2, the intermediate-ith result Z (t-i-2N - 2) is formed, equal to

Z (t + 2N-2). ,,

 -Ha"..

..J, +. .. + x,. but, ,

at the output of the third adder 3.3 intermediate result

(3)

+ x. a,

+

. +

40

, etc.

a, + x, a2

0

five

 ;

in the next - momel. time t + +2 () - i-1 the value of the input signal X ij, (i: - + - 2N-2) is recorded in the first 1.1 shift. Soder 1simy re-. History 1.1, ..., (N-2) is not rendered into the following registers 1,2,. ,,, 1. (N-1) shift, and an input count x appears in the input of the multichannel recursive digital filter, (t + 2N-1). Intermediate results of two-input i LK adders 3, 2,,. . , 3, () is reserved ..1 - .. h in groups 4. 1,., .. 4 (N-2) additional shift registers. Content of .groups 4, 1,,. about 5. (N-1) additional registers shift a. It enters the second entrances of two-door tail apparatuses 3. one,,. ,,, 3, (N- 1), where the filtering coefficients, which are fed to the first inputs of two tail combiners 3.1, ..., 3, are summed with the product of the corresponding input samples q. (N-1) from the outputs of multipliers 2.1 .,., 2. (N-1).

Thus, at the output of the first two-input adder 3.1, the next output count y., (T + 2N-1) is formed, representing the sum of the intermediate output Z2 (t + 2N-2) in accordance with the expression (3) and the product Xc, , and those.

y,., (t + 2N-1) x a ,, -х

N-2 +

(five)

+ X2a.5 + ... + x „.5,. ,, a, nx, .ar.

In the following moments of time, the output of the first two-input adder 3.1 is similarly formed — 20 SPs are as follows (

yfj (t + 2N) x, a, j.i. A1 + x, a „;

y (t + 2N + 1) x, a.2 + hga, 2

+ x, b, and

y ,,, (t + 2N + 2), + x

+ x and

yr

+.

,but,,

From the analysis of the above equations it can be seen that at the output of the multichannel

A multi-channel non-recursive digital filter containing successively connected N-1 shift registers, where N is the order of a multi-channel non-recursive digital filter, and N multipliers, whose inputs are connected to the corresponding shift register dam, except for the first ut-5 multiplier, whose input is connected to with the input of the first shift register and is the input of the multichannel non-recursive digital filter, which also, in order to improve speed, are introduced N-1 two-input adders, the first inputs of which are connected s to the inputs ix (where, 2 ,, .., N-1) the mind of the scissors, respectively, N-1 groups of additional shift registers for K-1 (where K is the number of channels of the filter) connected in series shift registers in each group and included between outputs jx (where

a non-recursive digital filter alternately forms the output signals of the first channel y; (t + 2i) and the second 35, 3 ,, ..,) and the second inputs of the channel y; (t- -2L + 1), and (j-l) -x two-input adders, respectively, except for the (N-1) -th group of additional shift registers connected between the output N-ro intelligently

y, (t + 2i) x; -n, a ,, a „+ +. ; + x;

a, + x;

y (t-f2i + 1) ,, + .., + Xj, a, -x; -but,

 N-1

-fx:

(7) (8)

and the second input of the (N-1) -th two input adder, and the output of the first two-input adder is the output of a multi-channel non-recursive digital filter.

 In the case of building a filter on an arbitrary number of channels K on you

15

In the course of the filter, output samples for each of the K channels will be alternately generated.

The use of two-input combiners for the implementation of the proposed multichannel filtering algorithm allows a significant increase in speed.

Claims (1)

10 1 claims A multichannel non-recursive digital filter containing successively connected N-1 shift registers, where N is the order of a multichannel non-recursive digital filter, and N multipliers, whose inputs are connected to the corresponding dam shift registers, except for the first ut-5 multiplier, whose input connects the GSN to the input of the first the shift register is the input to the multichannel non-recursive digital filter, about and with the fact that, in order to improve speed, N-1 two-input adders, the first inputs of which are connected s to the inputs ix (where, 2 ,, .., N-1) of multipliers, respectively, N-1 groups of additional shift registers for K-1 (where K is the number of film filters |, traction) connected in series shift registers in each group and included between the outputs jx (where 25 thirty 35, 3 ,, ..,) and the second inputs (j-l) -x of two-input adders, respectively, except for the (N-1) -th group of additional shift registers connected between the output N-ro intelligent- and the second input of the (N-1) -th two-input adder, and the output of the first two-input adder is the output of a multi-channel non-recursive digital filter.