JPH03220922A - Phase difference adjustment control system - Google Patents

Abstract

PURPOSE:To adjust a phase between reception signals of plural systems even in case of inserting no frame pulse or the like by adjusting a phase adjustment section in a system switching section so that a phase difference between consecutive 0 signals received respectively therein is made zero. CONSTITUTION:Descrambling in the descrambling section 5 of a reception section 2 at phase adjustment is stopped to add a '0' consecutive detection signal in a BnZS coding section 6 to a system switching section 3. when a same data is sent in an active system and a standby system, since '0s' of the same number are consecutive, when the phases of the reception signals fed from the reception section 2 to the system switching section 3 are coincident, the phases difference between the '0' consecutive detection signals is made zero by the adjustment of a phase adjustment section 4 composed of a delay circuit or the like. Thus, even when a frame pulse or the like is not inserted, the phase between the reception signals of plural systems is adjusted.

Description

[Detailed Description of the Invention] [Summary] Regarding a phase difference adjustment control method that adjusts the phase difference between received signals of multiple systems such as working and backup systems, even when frame pulses etc. are not inserted, the difference between the received signals of multiple systems A processing circuit converts an input bipolar signal into a unipolar signal, decodes the BnZS code, performs scrambling, and converts the same data output from the processing circuit into unipolar signals. It has a plurality of transmission units for transmitting signals, a reception unit corresponding to the transmission units of the plurality of transmission units, and a system switching unit for switching and outputting the received signal of the reception unit corresponding to the system, to the system switching unit. In the phase difference adjustment control method for adjusting the phase difference of the input received signal, the reception section includes a phase adjustment section, a descrambling section, and a BnZS encoding section, and when adjusting the phase, the descrambling section The descrambling in the process is stopped, and the undescrambled received signal is subjected to BnZS encoding by detecting n consecutive "'0"s by the BnZS encoding section, and along with the BnZS encoded signal, "'
0" continuous detection signal is applied to the system switching section, and the phase adjustment section is adjusted so that the phase difference between the "O" continuous detection signals respectively received in the system switching section becomes zero. Configured.

[Industrial application field]

The present invention relates to a phase difference adjustment control method for adjusting the phase difference between received signals of multiple systems such as active and backup systems.

Sends and receives the same data using multiple systems such as active and backup systems,
On the receiving side, when selecting and outputting only one system of received signals,
In order to switch the received signals of each system manually inputted to the system switching unit at an arbitrary timing, it is necessary that they have the same phase. However, since the phases usually differ due to differences in wiring distance, etc., the phases are adjusted using a variable delay circuit or the like. Normally, phase adjustment is performed when starting up a communication system, and it is desired to be able to perform the adjustment by economical means.

[Conventional technology]

As a communication system that transmits and receives the same data through a plurality of transmission paths, for example, a working/standby switching wireless communication system shown in FIG. 5 is known. In the same figure, 51 is a bipolar-unipolar conversion circuit (B-U)
, 52 is a BnZS decoding circuit (DEC), 53 is a transmission control circuit that inserts frame pulses F, etc., 54.55 is a wireless transmitter, 56.57 is a wireless receiver, 58.59 extracts frame pulses F, etc. Reception control circuit, 60 is a switching circuit (SW) for switching between working and standby, 61 is BnZS
The encoding circuit (COD) 62 is a unipolar-bipolar conversion circuit (U-B).

Transmission data as a BnZS code bipolar signal is added to the transmission section, and the bipolar/unipolar conversion circuit 51
The BnZS decoding circuit 52 removes the bipolar violation pulse which is converted into a unipolar signal by the BnZS code and inserted every consecutive "0" of n bits of the BnZS code. For example, B8ZS with n=8 in the BnZS code
In the case of a code, a bipolar violation pulse is inserted every eight consecutive "0"s.

Such a bipolar signal is converted into a unipolar signal and applied to the transmission control circuit 53. This transmission control circuit 5
At step 3, the frame pulse F is inserted, scrambled, and applied to the radio transmitter 54, 55, modulated to a transmission frequency, and transmitted from the antenna.

In the receiving section, wireless receiving sections 56 and 57 corresponding to the wireless transmitting sections 54 and 55 are provided, and the received signals from the wireless receiving sections 56 and 57 are applied to reception control circuits 58 and 59, and the frame pulse F is The signals are removed and descrambled, and the switching circuit 60 switches and outputs one of the received signals.

That is, if the transmission path via the wireless transmitter 54 and the wireless receiver 56 is the active system, the wireless transmitter 55 and the wireless receiver 5
7 becomes the backup system, and when the working system is normal, the switching circuit 60 switches and outputs the received signal of the working system. Then, the switched output signal is applied to the BnZS encoding circuit 61, and the n-bit “0”
゛Continuity is detected, unipolar/bipolar conversion circuit 6
2 into a bipolar signal, a bipolar violation pulse is inserted based on the n-bit "0" continuous detection signal, and the signal is transferred to a data processing section (not shown).

When a failure occurs in the working system, the switching circuit 60 switches from the receiving signal of the working system to the receiving signal of the protection system. In this case, in order to prevent data loss, it is necessary to match the input phases of the working system reception signal and the protection system reception signal to the switching circuit 60. For this reason, conventionally,
For example, as shown in FIG.
The extracted frame pulse F is input to the switching circuit 60, the human phase of the frame pulse F is observed with a synchroscope 65, and the phase adjustment circuits 63 and 64 are adjusted so that the human phase matches. there were.

In addition to the one-to-one working/backup switching method as mentioned above,
Even in a system in which one protection system is provided for n working systems, the path lengths to the switching circuit 60 are different, so the frame pulse F is applied to each protection system as described above. The phase is adjusted so that the phase difference between them becomes zero.

[Problem that the invention seeks to solve]

In the conventional example described above, the transmission control circuit 53 requires means for inserting the frame pulse F, and the reception control circuits 58 and 59 require means for extracting the frame pulse F, resulting in a complicated circuit configuration. There were drawbacks.

Furthermore, it is necessary to provide a switching circuit 60 immediately after the reception control circuits 58 and 59 for extracting the frame pulse F from the received signal, and there is a drawback that the placement position of this switching circuit 60 is restricted.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to adjust the phase between received signals of a plurality of systems even when frame pulses and the like are not inserted.

[Means to solve the problem]

The phase difference adjustment control method of the present invention detects a phase difference by using a "0" continuous detection signal in a BnZS encoding circuit, and will be explained with reference to FIG.

A plurality of transmitting units 1 for converting an input bipolar signal into a unipolar signal by a processing circuit, decoding the BnZS code, performing scrambling, and respectively transmitting the same data output from the processing circuit; It has a receiving section 2 and a system switching section 3 that switches and outputs the received signal of the receiving section 2 corresponding to each system, and adjusts the phase difference of the received signal from the receiving section 2 that is input to this system switching section 3. In the phase difference adjustment control method, the receiving section 2 includes a phase adjusting section 4, a descrambling section 5, and a BnZS encoding section 6, and performs descrambling in the descrambling section 5 during phase adjustment. The BnZS encoder 6 detects n consecutive O11s and BzZS encodes the received signal that has been stopped and is not descrambled. Together with this BnZS encoded signal, the 0° continuous detection signal is sent to the system switching unit. In addition to 3, the phase adjustment section 4 is adjusted so that the phase difference between the continuous detection signals of "0-par" becomes zero.

[Operation] Data is transferred using a BnZS code, and a unipolar signal is used between the transmitting section 1 and the receiving section 2, and is transmitted after being scrambled.
The descrambling in the descrambling unit 5 is stopped, and the continuous “0′” detection signal in the BnZS encoding unit 6 is applied to the system switching unit 3. 'Like the active system and standby system,
When the same data is transmitted, the same number of consecutive “0”s will occur, so if the phases of the received signals applied from the receiver 2 to the system switching unit 3 match, the phases of the consecutive “O” detection signals also match. I will do it.

Therefore, the phase adjustment section 4 consisting of a delay circuit or the like is adjusted so that the phase difference between the "O" continuous detection signals becomes zero.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a block diagram of an embodiment of the present invention, showing a case where it has a working system and a standby system wireless transmission path.
), 12 is a BnZS decoding circuit (DEC), 13 is a transmission control circuit, 14.15 is a wireless transmitter, 16.17 is a wireless receiver, 18°19 is a reception control circuit, 20.21 is a BnZ
22 is a switching circuit, and 23 is a unipolar/bipolar conversion circuit (U-B).

The transmitting side is the same as the conventional example, and is composed of a bipolar/unipolar conversion circuit 11, a BnZS decoding circuit 12, a transmission control circuit 13, and a wireless transmitter 14.15. The receiving side includes a wireless receiving section 16, 17 and a receiving control circuit 18.
19 and BnZS encoding circuits 20 and 21 correspond to the receiving section 2 in FIG. 1, and the switching circuit 22 corresponds to the system switching section 3 in FIG.

The transmission control circuit 13 includes a scrambling section, and includes a bipolar/unipolar conversion circuit 11 and a BnZS decoding circuit 1.
2, the bipolar signal is converted into a unipolar signal, and the bipolar violation pulse is detected and removed, applied to the transmission control circuit 13, scrambled, and applied to the wireless transmitter 14 and 15, respectively. , is modulated to a radio frequency and transmitted.

The signals received by the radio receivers 16.17 are respectively applied to reception control circuits 18.19.

This reception control circuit 18.19 includes a phase adjustment circuit and a descrambling section, and is descrambled by the descrambling section and outputs to the BnZS encoding circuit 20.21.
The "0"' continuous detection signal that detected a series of n "0"s and the BnZS encoded signal are applied to the switching circuit 22, and either one of the BnZS encoded signals is Switched output, unipolar/bipolar conversion circuit 2
3 into a bipolar signal, and a bipolar violation pulse is inserted based on the "0++ continuous detection signal."

During phase adjustment, descrambling in the descrambling units of the reception control circuits 18 and 19 is stopped, and the BnZS encoding circuit 2
The phases of the continuous detection signals from 0.21 to 0.0 applied to the switching circuit 22 are compared and adjusted by the phase adjustment circuits in the reception control circuits 18 and 19 so that the phase difference becomes zero.

FIG. 3 is an explanatory diagram of phase adjustment according to an embodiment of the present invention, in which the reception control circuits 18 and 19 are connected to the phase adjustment circuits 31 and 32.
It is equipped with descrambling pattern generation circuits 33, 34, exclusive OR circuits 35, 36, AND circuits 37, 38, and switches 39, 40 for stopping descrambling, and phase adjustment circuits 31, 32. , for example, is composed of a variable delay circuit.

When switches 39 and 40 are in the illustrated state, AND circuit 3
7. Since the +■ high level signal is input to 38,
The descrambling pattern from the descrambling pattern generation circuit 3334 is applied to exclusive OR circuits 35.36 via AND circuits 37.
Descrambling of the received signal via 32 is performed. Then, the descrambled signal is applied to the BnZS encoding circuit 20.21, where n consecutive 0°'s are detected, and the "0" consecutive detection signal det is combined with the BnZS encoded signal. is added to the switching circuit 22. The signal switched and outputted by the switching circuit 22 is converted into a bipolar signal by the unipolar/bipolar conversion circuit 23 shown in FIG.

Also, when the switches 39, 40 are switched, the AND circuit 37.
Since a low level signal is input to 38, the descrambling pattern from the descrambling pattern generating circuits 33, 34 is no longer applied to the exclusive OR circuits 35, 36, and therefore descrambling is stopped.

Therefore, under normal communication conditions, switch 39.
40 to the state shown, and when adjusting the phase, switch 39.
40 to the ground side. And BnZ
The "0" continuous detection signal det applied to the switching circuit 22 from the S encoding circuit 20.21 is applied to the synchroscope 30, the phase difference is observed, and the phase difference is set to zero.
This is for adjusting the phase adjustment circuits 31 and 32.

On the receiving side, the BnZS encoding circuit 20゜21 performs BnZS encoding and processes the same received signal, so at the same time "0" continuous detection bone d
et should be obtained, and its "0'° continuous detection signal d
If the phases of et are different, the phases of the BnZS encoded signals input to the switching circuit 22 will also be different.

Therefore, by comparing the phases of this "°0" continuous detection signal det, phase adjustment becomes possible without using the frame pulse F as in the conventional example.

FIG. 4 is an explanatory diagram of phase adjustment in another embodiment of the present invention,
The same reference numerals as in Fig. 3 indicate the same corresponding parts, 41.42
is a phase adjustment circuit, 43.44 is a self-descrambling circuit, and 45.46 is a selector.

The self-descrambling circuits 43 and 44 are capable of descrambling the received signal in synchronization with the scrambling on the transmitting side. The output signal is selected by the selector 45.degree. 46 and applied to the BnZS encoding circuit 20.degree. 21. Also selector 45
．． When the output signals of the phase adjustment circuits 41 and 42 are selected by 46, descrambling is stopped.

That is, during phase adjustment, the selectors 45.46 are controlled to select the output signal of the phase adjustment circuit 41.42, and the BnZ
It is added to the S encoding circuit 20.21, and this Bn
The phase difference between the "0" continuous detection signals aet applied from the ZS encoding circuit 20.21 to the switching circuit 22 is observed by the synchroscope 30, and the phase adjustment circuit 41.42 is adjusted so that the phase difference becomes zero. It is intended to do so.

During phase adjustment, even if the data input to the bipolar/unipolar conversion circuit 11 on the transmitting side is all "0", the data is scrambled in the transmission control circuit 13), so it is "1°". When the reception control circuits 18 and 19 on the receiving side perform descrambling, the data becomes all "0" data. Sochi 39.40
If descrambling is stopped by switching to the ground side or by selecting the output signal of the phase adjustment circuit 41, 42 using the selectors 45, 46 in FIG. 4, after "1", n consecutive "0"s may occur, and if the phase difference between the consecutive "0" detection signals det is zero, the phase difference between the received signals input to the switching circuit 22 will be zero. Therefore, the phase adjustment circuits 31, 32, 41 .
41, the received signal phase is adjusted so that the phase difference between the "ON" continuous detection signals det becomes zero.

The present invention is not limited to the above-mentioned embodiments, but can be modified in various ways, such as:
“0°” continuous detection signal det applied to the switching circuit 22
It is also possible to adopt a configuration in which the phase adjustment circuit is automatically controlled so that the phase difference between the two becomes zero. Furthermore, it can be applied not only to a 1:1 working/standby switching system, but also to an n:1 working/standby switching system.

〔Effect of the invention〕

As explained above, the present invention stops descrambling in the descrambling unit 5 of the receiving unit 2 during phase adjustment, detects n consecutive “0’s” by the BnZS encoding unit 6, and 0" continuous detection signal is applied to the system switching section 3, and the phase adjustment section 4 is adjusted so that the phase difference between the "0" continuous detection signals becomes zero. This is necessary on the receiving side. By using the BnZs encoding unit 6, it is possible to detect the phase difference between the systems, such as between the working system and the backup system, and adjust them so that they are in the same phase.Therefore, frame pulse insertion on the transmitting side There is an advantage that the frame pulse extraction means on the receiving side can be omitted.There is also an advantage that the system switching section 3 can be placed at an arbitrary position after BnZS encoding.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the principle of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is an explanatory diagram of phase adjustment of one embodiment of the present invention, and FIG. 4 is another embodiment of the present invention. Example phase adjustment diagram,
FIG. 5 is a block diagram of the conventional example, and FIG. 6 is an explanatory diagram of phase adjustment of the conventional example. 1 is a transmitting section, 2 is a receiving section, 3 is a system switching section, 4 is a phase adjustment section, 5 is a descrambling section, and 6 is a BnZS encoding section.

Claims (1)

[Claims] A plurality of transmitting units (1) that convert an input bipolar signal into a unipolar signal by a processing circuit, decode a BnZS code, perform scrambling, and transmit the same data output from the processing circuit. 1), a receiving section (2) corresponding to the transmission section (1) of the plurality of systems, and a system switching section (3) that switches and outputs the received signal of the receiving section (2) corresponding to the system. In the phase difference adjustment control method for adjusting the phase difference of the received signal input to the system switching section (3), the receiving section (2) includes a phase adjustment section (4) and a descrambling section ( 5) and a BnZS encoding section (6), when adjusting the phase, descrambling in the descrambling section (5) is stopped, and the received signal that is not descrambled is sent to the BnZS encoding section (6). ), n “
Continuous 0's are detected and encoded in BnZS, and together with the BnZS encoded signal, the continuous 0's detection signal is sent to the system switching unit (3).
), the phase adjustment unit (4) is also adjusted so that the phase difference between the “0” continuous detection signals respectively received by the system switching unit (3) becomes zero. Phase difference adjustment control method.