Control signal generator of device for suppressing echo signals

专利摘要:
The invention relates to bidirectional data transmission systems of a pi two-wire circuit, in particular, to a technique of suppressing reflected signals. The purpose of the invention is to increase speed. The device contains block 1 of the suppression of reflected signals, differential block 2, block 3 of subtraction, block 4 of trigger signals. Newly introduced by Mr. pseudo-random sequence 5. Block 4 consists of two sample converters, two shift registers, two multipliers (1 -N) summers
公开号:SU1308208A3
申请号:SU823523577
申请日:1982-12-08
公开日:1987-04-30
发明作者:Жан-Марк；Колен Де Вердьер Мари；Рене Ланглуа Патрик
申请人:Сосьете Аноним Де Телекоммюникасьон (Фирма)；
IPC主号:

专利说明:

The present invention relates to two-wire bidirectional data transmission systems and, in particular, relates to a technique for suppressing reflected signals.
The aim of the invention is to increase speed.
Fig. 1 shows a block diagram of a control signal generator for an echo suppression device; figure 2 is a block of start signals.
. The driver of the control signals contains a block of 1 suppression of reflected signals, a differential block 2, a block 3 of subtraction, a block 4 of start signals and a generator 5 of a pseudo-random sequence (PSP), and the block 4 of start signals consists of the first converter of 6 samples, the first register 7 , the shift, the second transducer 8 samples, the first multipliers 9 9, the second register 10 shift, adders llj-il, j the storage unit 12 and the second translate knives ate and 13, - 13 | ii.
The shaper control signal works as follows
In the case that, when the reflection suppression unit 1 is processed in the baseband, the update of the coefficients according to the gradient algorithm at the point in time is described as follows:
Cj, / n + i / C / n / + ye / n / a / n-k /, where Y is a real positive constant.
Differentiating unit 2 provides the connection of Lia with a modem during transmission and reception.
The input of the block 4 of the start signals receives the signal U of the start-up sequence, as well as the signal S of the estimated reception.
The memory bandwidth generator 5 provides the message {Sleep input to the trigger unit 4, which produces, at the output, the coefficients directly used by the reflected signal suppression unit 1 as initial coefficients C, the samples forming the sequence are pseudo-random and their period is -1) 1.
The message from the first transducer of the 6 samples is converted into a message e, which is formed from the samples / a, -a /, i.e. each sample

08208 e
Z is derived from the IC sample using the ratio a / 2U, /. In practice, the value of a is preferably chosen equal to 1.
5 Message e j on one side
is transmitted to the line, and on the other hand is fed to the input of the first shift register 7, consisting of N cells, each of which introduces a delay T.
to The first cell contains е ,, in the second cell - еу .., and in the M cell - (N-M + K-n) modulo M and finally in the N cell of the first shift register 7 contains e,. Then all N samples
f5 in parallel arrive at the inputs of the second converter of 8 samples, also containing N cells, the outputs of which from the input signals form samples, etc., namely, the sample Cc is generated at the output of the first cell, and the sample U is produced at the output N, .
In the general form, the sample .jN is fed to the input of the M cell, and the output is the U (“- M4.kn) moc sample. N The obtained LY samples UK-U c + 14k-mV to + 1 are fed to the input N of the first multipliers 9 (- 9 /, in which the sample is multiplied by a sample with a sample S, taken from the transmission line from the output of subtraction unit 3. Received from N first multipliers 9 / - 9fj N results,, N / post35 to the inputs of the second register 10 shifts, which were set to the zero state by N adders 11, - 11M Multiply and sum operations are performed
40 since NT., I.e. by the arrival of the sample Sfg and in general view by the arrival of the samples, where k varies from O to N-1.
20
25
thirty
Application of N Adders
11.11
and
0
allows you to accumulate at the considered time / N + K / T the contents N of the second converter 8. Then the contents of the second register of the 0 shift at the moment / N + K / T will be a sample, where
LK / 1 / LK, / 1 / + 8m + K or, .., / 1 / + 3 „4k) mociN,
Then, at time / N + K + 1 / T, the contents of the first register 7 become 5 times equal to ,, accepted: the sample is equal to .., then the following calculation is performed, arriving at the second register 10 of the second:
Kti NtK4i UtK-j + i jmodN
in memory of storage unit 12
2
contains the constant koa / N + l /
 the second one multiplies each sample h / i / second shift register 10 in N second multipliers (13, - 13).
Obtained at the output of the N second multipliers 13, - 13 | the coefficients H / i / (, N) are you-N-1 values
 N41
her"
 N + K
 K-1
e
N-1 N-3
 h-g
N4
The sample values are given as follows:
and,.,.
and ... and.
and, .... and,
TO
Un-i + 2 UN-J4i4K / mojN U, j
and
kn-1
and
N
It should be noted that the variant of re35
This device provides the operating conditions for the reflected signal suppression unit in the main frequency band. It is provided for transmitting systems operating with remote echoes, which is often encountered during transmission via a communication satellite.

权利要求:
Claims (1)
[1]
Invention Formula
A control signal generator for the echo suppression device, comprising a trigger signal block whose outputs are connected together responsibly to the inputs of the echo suppression block and to the input of the differential block, which is combined; not with the control input of the echo suppression unit, and the output of the trigger unit is connected to the output of the subtractor unit, to the inputs of which the outputs of the differential unit and the unit are connected
082084
A burk of the impulse response of the reflected signal, which is fed to the inputs of the block 1 of the suppression of the reflected signals and serve as 5 initial coefficients ..
If these samples (HJ are samples of the impulse response of the reflected signal, then the signal received in the stationary mode is equal to
-G
.
N.
-N-j4; 2
...her
N-J4.H-KmoJN
 Ktl
HI
....
N.
 N-t
N-1 N-1
SNI-A
U, j
and
N
 N + K
ai-1
of suppressing reflected signals, in view of the fact that, in order to increase speed, a pseudo-random sequence generator (PRS) was introduced into it, with the trigger signal block made in the form of serially connected first sample converter and the first shift register, whose bit outputs through the second the sample converter is connected to the inputs of the corresponding first multipliers, the outputs of which through the corresponding adders are connected to the inputs of the corresponding bits of the second shift register, one the outputs of the bits of which are connected to other inputs of the corresponding adders, and the other outputs of the bits of the second shift register are connected to the first inputs of the second corresponding multipliers, to the second inputs of which the corresponding outputs of the storage unit are connected, and the outputs of the second multipliers and the output of the first sample converter are outputs the trigger signal block, the combined second inputs of the first multipliers are the trigger block input, and the auxiliary trigger block input and is the input to the first sample converter to which the SRP generator output is connected.
Editor N.Shvydka
Compiled by V. Evdokimova
Tehred V.Kadar Proofreader A.Zimokosov
Order 1646/59 Circulation 639Subscription
VNIIPI USSR State Committee
for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d.A / 5
Production and printing company, Uzhgorod, Projecto st., 4

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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FR8122984A|FR2517905B1|1981-12-09|1981-12-09|INITIALIZATION DEVICE FOR ECHO CANCELER AND ITS APPLICATION TO FAR ECHOES|

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