• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to wired information transmission systems. The purpose of the invention is to improve the accuracy and speed of compensation. The method of compensating for cross and / or echo signals is performed by a device comprising transmitting and receiving parts 1 and 2, tunable filter 3, compensating unit 4, switching unit 5, block 6 make decisions, differential block 7, input block 8, adaptive compensators 9 and 19, boundary signal block 10, distortion compensator 11, control amplifier 12, drivers 13, 14 and 16 characters, averaging b Lock 15. In addition, the device may contain an additional two attenuators. To achieve the goal, the device restores the receiving signal and determines the amplitude difference between the receiving and recovered receiving signals. The resulting difference signal is compared with the threshold, when exceeded, a tuning signal is generated from the compensated receiving signal. When the differential signal exceeds a threshold value, a tuning signal is generated from the differential signal. 2 sec. and 14 hp ff, 3 ill.
    公开号:SU1699358A3
    申请号:SU843817567
    申请日:1984-11-29
    公开日:1991-12-15
    发明作者:Шенк Хайнрих
    申请人:Сименс Аг (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to wired information transmission systems.
    The purpose of the invention is to improve the accuracy and speed of compensation.
    FIG. 1 is a functional electrical circuit diagram of a device implementing a method for compensating for cross-over and / or echo signals; in fig. 2 - functional electrical circuit-device with the inclusion of attenuators; in fig. 3, too, with the inclusion of an additional adaptive compensator.
    The device for compensating cross and / or echo signals contains transmitting 1 and receiving 2 parts, tunable
    filter 3, compensating unit 4, switching unit 5, decision unit 6, differential unit 7, input unit 8, adaptive compensator 9, boundary signal unit 10, distortion compensator 11, control amplifier 12, sign shaper 13, first additional driver 14 mark, averaged block 15, the second Additional shaper 16 characters, the first 17 and second 18 attenuators and an additional adaptive compensator 19.
    A device that implements the method of compensating for cross and / or echo signals, works as follows
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    The transmitting part 1 of the four-wire line has a transmitting circuit of digital signals for transmitting pulses of signals in a predetermined form or with a given spectrum.
    The receiving part 2 has a digital signal receiving circuit in which the pulses of the receiving signals first pass through the filter circuit and the distortion compensator 11, and then enter the compensating unit 4, at the output of which a compensated receive signal appears. This signal then passes through the control amplifier 12 to the decision block 6 implemented by the Schmitt trigger.
    If the two-wire line has reflection points corresponding to abrupt changes in linear parameters, then in addition to the main pulses of the reception signals, also distorted during their transfer, the receiving part 2 receives reflections of the transmission signals and, in addition, some of the transmission signals with limited attenuation in the band harmony. In the receiving part 2, a mixture of reception signals is formed from the intrinsic (more or less distorted) pulses of the reception signals and consisting of the reflected and / or cross signals of the interference signal. The last interference signal can be compensated from the compensating unit 4, which forms the compensation signal corresponding to the transmission signal, for which, accordingly, the coefficients of the tunable filter 3 are set.
    To set the tunable filter 3 coefficients, a control signal from the output of the compensating unit 4 is provided to the control signal input of the tunable filter 3, which allows the coefficients of the tunable filter 3 to be set based on the compensated reception signal, so that the residual signal is minimized. An element transmitting the sign of the signal — an additional generator of 14 signs — can be entered into the line of the regulating signal leading from the output of the compensating unit 4 to the input of the tunable filter 3, so that the coefficients are determined by the sign of the compensated reception signal. This adjustment is carried out through the switching unit 5, to the other input of which the output of the differential unit 7 is connected, if necessary, transmitting the corresponding signal symbol through the character generator 13.
    The output of the differential unit 7 is also connected through the block 10 of the boundary signal, made in the form of a Schmitt trigger,
    with control input of switching unit 5.
    Setting the appropriate threshold value for boundary signal block 10
    due to the fact that in the tunable filter 3 a compensation signal is formed depending on the fact that with a higher (if necessary averaged in the averaging block 15) difference between the input
    0 and the output signals of the decision block b, the filter coefficients are set by the compensated reception signal or by its sign, as a result, the coarse value is obtained relatively quickly.
    5, the compensation allows the adaptive distortion compensator to release the useful signal superimposed on the residual signal so much that the decision error signal contains almost only the residual signal. At the same time, with a lower (if necessary averaged) difference between the input and output signals of the block 6, the decision factors of the tunable filter 3
    5 is set according to this difference or according to their sign, which achieves a fast and reliable installation of the compensation circuit. In this case, the adjustment value for the tunable filter coefficients 3 may also depend on the corresponding gain of the regulating amplifier 12, and with a higher gain, the adjustment value for the tunable filter is reduced, and at a lower gain
    5, the magnitude of the adjustment is increased. In the device before the compensating unit 4 of the four-wire line, the distortion compensator 11 can be switched on. However, it is desirable to avoid such an intermediate
    0 compensation of distortions occurring before the cross and / or reflected compensation.
    The introduction of the adaptive compensator 9 ensures the release of the compensated received signal from interfering additional oscillations.
    Before adaptive compensation of distortions, the first intermediate correction of a compensated received signal may first occur, for which the series-connected compensator 11 of distortions and an additional adaptive compensator 19 (Fig. 3) are introduced into the circuit going from the compensating unit 4 to the adaptive compensator 9.
    An additional adaptive compensator 19, implemented, for example, on a transversal filter, is connected via an input unit 8 to an input of a decision unit 6. Optional adaptive
    A compensator can be installed in the same way as an adaptive compensator 9 with a decisive feedback. Both adaptive distortion compensators 9 and 19 release the compensated, amplified and compromise-corrected received signal from additional oscillations.
    As can be seen from FIG. 1 and 2, after cross-over and / or echo cancellation, the gain of the compensated received signal may first be adjusted, for which a regulating amplifier 12 is connected to the compensating unit 4. Moreover, the adjustable magnitude of the coefficients of the tunable filter 3 may be formed depending on the corresponding gain regulating the amplifier 12, with a higher gain, the amount of regulation is reduced, and with a smaller gain, the amount of regulation is increased.
    The control signal from the control amplifier 12 to the tunable filter 3 allows for setting the filter coefficients not only required by the sign of the corresponding control signal, taking into account the effect of the gain of the received signal on the control signals, which leads to increased costs when installing the filter. However, this filter installation can be avoided. This is achieved by the fact that the difference signal, derived from the difference between the receiving and restored receiving signals of the decision block, for the tunable filter X and multiplying the difference signal by a factor inversely proportional to the gain factor.
    For this, between the output of the regulating amplifier 12 and the corresponding input of the tunable filter 3 a first attenuator is introduced with attenuation coefficients proportional to the gain of the regulating amplifier 12.
    This allows you to take into account the signal gain before directly installing the filter by appropriately correcting the input signal connected to the tunable filter 3 (Fig. 2).
    Accordingly, as shown in FIG. 2, a second attenuator 18 is introduced into the regulating signal line leading from the output of the differential unit 7 through the corresponding input of the switching unit, which is proportional to the gain of the regulating signal amplifier (Fig. 2).
    权利要求:
    Claims (16)
    [1]
    Invention Formula
    1, Method of compensating for cross and / or echo signals in a digital communication system between the transmitting and receiving branches
    5 of the four-wire line, comprising generating amplitude coefficients in an adaptive scheme by multiplying the tuning signals and transmitting and summing the products, and
    10 also forming in the digital filter for each transmitting signal a compensating signal taking into account amplitude estimation coefficients and forming a compensated receiving signal,
    5 characterized in that, in order to increase the accuracy and speed of compensation, the receiving signal is restored, the amplitude difference between the receiving and restored receiving signals is determined
    0 by signals, the received differential signal is compared with a threshold, when exceeded, a tuning signal is generated from the compensated receiving signal, and when the differential signal exceeds a horn value, a tuning signal is generated from a difference signal.
    [2]
    2. A method according to claim 1, characterized in that the tuning signal contains information only about the sign of the difference signal.
    [3]
    0 3. The method of claim 1, wherein the difference signal is averaged before comparison with the threshold.
    [4]
    4. The method according to claim 1, characterized in that, before compensating for the cross
    5 and / or echo signals, the received signal is corrected.
    [5]
    5. The method according to claim 1, wherein that after forming the compensated signal, the correction of the images was made.
    [6]
    6. The method according to claim 1, characterized in that after compensating for the cross and / or echo signals, an adjustable gain is performed.
    [7]
    5 7. The method of claim 6, wherein the tuning signal is multiplied by a factor inversely proportional to the gain factor.
    [8]
    8. A cross and / or echo cancellation device containing the transmitting and receiving parts of the four-wire line, the transmitting part of the four-conducting line being connected via a tunable filter to the compensating unit included in the receiving part of the four-conducting line, the output of which is. connected to the first input of the switching unit, the output of which is connected to the control input of the tunable filter, and the output of the compensating
    The unit is connected to the input of the decision unit, the input and output of which is connected to the second input of the switching unit through the differential unit, characterized in that the output of the compensating unit is connected to the input of the decision unit through the input unit, the second input of which is connected to the output of the adaptive compensator, connected to the output of the decision block, and the output of the differential block is connected to the control input of the switching block via the boundary signal block:
    [9]
    9. The device according to claim 8, which is based on the fact that the distortion compensator is turned on at the input of the compensating unit.
    [10]
    10. The device according to claim 8, that is, so that the output of the compensating unit is connected to the first input of the input unit through a control amplifier.
    [11]
    11. The device according to claim 8, distinguishes that the output of the differential unit is connected via a sign shaper to the second input of the switching unit.
    [12]
    12. The device according to claim 8, which is such that the output of the compensating unit is connected to the first input of the switching unit through an additional sign conditioner.
    [13]
    13. The device according to claim 8, wherein the output of the control amplifier is connected to the first input of the switching unit through the first attenuator, and the second input of the switching unit is connected to the output of the differential unit through the second attenuator.
    [14]
    14. The device according to claim 8, that is, with the fact that the output of the differential unit is connected to the input of the boundary signal unit through the averaging unit.
    [15]
    15. The device according to claim 8, wherein the output of the differential unit is connected via a second additional sign driver to the control input of the adaptive compensator.
    [16]
    16. The device according to claim 10, characterized in that the output of the control amplifier is connected to the input unit through a series-connected distortion compensator and an additional adaptive compensator.
    Priority points:
    12/01/83 in paragraphs 1-4, 6, 8, 9-12 and 14.
    04/17/84 in paragraphs 5. 7. 13 and 16.
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    同族专利:
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    US4688245A|1987-08-18|
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    FI844744L|1985-06-02|
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19833343584|DE3343584A1|1983-12-01|1983-12-01|Method and circuit arrangement for cancelling crosstalk and/or echo signals|
    DE19843414523|DE3414523A1|1984-04-17|1984-04-17|Method and circuit arrangement for cancelling crosstalk and/or echo signals|
    DE19843414554|DE3414554A1|1984-04-17|1984-04-17|Method and circuit arrangement for cancelling crosstalk and/or echo signals|
    DE19843414534|DE3414534A1|1984-04-17|1984-04-17|Method and circuit arrangement for cancelling crosstalk and/or echo signals|
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