JPH03278629A - Immediate synchronizing system for synchronizing signal - Google Patents

Abstract

PURPOSE:To obtain synchronization state immediately by obtaining a time difference between synchronizing signals of a host station and its own station individually at the host station and its own station and controlling a synchronizing signal of its own station based on both the time differences. CONSTITUTION:A power supply application detection circuit 7 detects power application of its own station, an absolute value difference detection circuit (ADV) 8 obtains a mean value F of the absolute value of the difference between the time difference C of a synchronizing signal A of its own station and a synchronizing signal B from a host station and a time difference D obtained similarly at the host station. A control direction detection circuit (CGC) 9 decides the time direction controlling the synchronizing signal A of its own station through the comparison between both the time differences C, D to decide a control variable with a mean absolute value difference F1/F2 from the AVD 8 and sends an output G representing them to a pulse generating circuit(PGC) 10. The PGC 10 sends a control pulse H at a point of time in response to the output G of the CDD 9 to reset a frequency divider circuit 3 thereby restarting the frequency division. Thus, the synchronizing signal of its own station is synchronous with the synchronizing signal of the host station in response to the application of power.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for immediately synchronizing the synchronization signal of a local station in response to a synchronization signal from an upper station that transmits and receives data.

[Conventional technology]

Fig. 3 shows a block diagram of the conventional example. In the lower station facing the upper station, the oscillator (hereinafter referred to as 08C)
The signal generated by 1 is passed through an automatic phase control circuit (hereinafter referred to as AP).
C) 2, the frequency is divided by the frequency divider circuit (hereinafter referred to as DIV) 3 that performs phase adjustment, and the synchronization signal of the own station (hereinafter referred to as LSY) is sent out as a signal, which is used for time measurement. It is supplied to the circuit (hereinafter referred to as TMC) 4 and also to the receiving section (
Hereinafter, the synchronization signal (hereinafter referred to as R8Y) B from the upper station received by the REC) 5 is given to the 4TMC4, where the time difference C between LSY・A and R8Y-B is determined, and this is calculated by the comparison circuit (hereinafter referred to as CMP) 6. It is meant to be given to

In addition, the upper station, which is omitted in the diagram, similarly calculates the time difference between the synchronization signal of the upper station and the received LSY-A, and then sends a signal indicating this to the lower station. The time difference is received by RFe5, and the time difference from the upper station and the time difference C obtained by TMC4 are processed by CMP.
6, and as a result, the phase adjustment status of the PC 2 is controlled, and the phase of LSY-A is changed in the direction that C=D.
This is to synchronize A.

[Problem to be solved by the invention]

However, when the power of the own station is turned on, L8Y-A is completely asynchronous to the synchronization signal of the upper station, and by the time LSY-A becomes synchronized with the synchronization signal of the upper station, the own station The synchronization pull-in time is determined by the transmission delay time between the terminal and the upper station, the phase control range and control cycle of each circuit 4 to 6, and this takes a relatively long time, so the synchronization state cannot be established immediately. First, there is a drawback that data transmission and reception cannot be started immediately.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention is configured by the following means.

In other words, the synchronization signal B from the upper station and the synchronization signal A of the own station
Input the time difference C and the time difference D'fr between the synchronization signal of the higher station and the synchronization signal of the own station determined at the upper station, calculate the absolute value of the difference between both time differences C and D, and then calculate the average of these. An absolute value difference detection circuit, a control direction detection circuit that determines the time direction for controlling the synchronization signal of the own station by comparing the two time differences C and D, and synchronization of the own station according to the output of this and the average of the absolute values. It is equipped with a pulse generation circuit that sends out control pulses that control the timing of signal generation, and a power-on detection circuit that starts the operation of each of these circuits in response to power-on of its own station.

Effect C] Therefore, each circuit becomes operational when the power is turned on, and the circuit automatically operates according to the time difference C1 between the synchronizing signal of the own station and the synchronizing signal B from the upper station, and the time difference similarly determined at the upper station. The time direction for controlling the synchronization signal A of the station is determined, and the control amount is determined by the average absolute value of the time difference C and DO difference, and these control the time point at which the synchronization signal person is generated. The synchronization signal A immediately becomes synchronized with the synchronization signal of the station.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to FIGS. 1 and 2 showing embodiments.

FIG. 1 is a block diagram, and FIG. 2 is a timing chart of the control situation. In addition to what is shown in FIG. 3, FIG. AVD (hereinafter referred to as AVD) 11, control direction detection circuit (hereinafter referred to as CDD) 9, and pulse generation circuit (hereinafter referred to as PG)
C) 10 is provided, and the AVD8 receives the information from the TMC4, the time difference C1 between 5Y-A and R8Y-B, the synchronization signal of the upper station obtained at the upper station, and the received LSY-
The time difference with A is input, and the absolute value IC-DI of the difference between the two time differences C and D is determined, and the average value thereof is determined.

7'j, POD7 detects the power-on of its own station, and puts the AVD lit into an operating state based on its detection output E, so that CDD9 and PGClo also start operating accordingly.

Therefore, CDD9 compares the two time differences C and D, and if C<D, the generation point of LSY-A is brought forward, and C
>D, it is determined that the generation point of L8Y-A should be delayed, thereby determining the temporal control direction of LSY-A, and performing a calculation to reduce the average absolute value difference F from AVD8 to 1/2. , thereby determining the control amount and sending an output G indicating these to PGClo.

Then, PGolG sends out a control pulse H from CDD 9 in the temporal control direction and at a time corresponding to the control amount, based on the current occurrence point of I, SY, and person, and uses this K to reset DIV3 using a counter etc. Do the following.

Therefore, DIV3 restarts the frequency division operation in accordance with the control pulse H, and as a result, fi LSY·A becomes completely synchronized with the synchronization signal of the upper station.

In other words, if the time difference C and D is C x D in Figure 2, if the synchronization signal from the upper station U is generated at time 21, this will be delayed at the own station due to the delay via the transmission path. At reception time 22, own station LQL8Y-A
Since the occurrence time is 23, R8Y-B and I,
The time difference C from 5Y-A indicates the interval between time points 22 and 23.

In addition, since the generation point 23 of LSY-A at the local station becomes the reception point 24 at the upper station U via the transmission path delay, the time difference between these is the interval between points 24 and 21, which is the It is obtained at station U and then transmitted to the lower station.

Therefore, calculate the average absolute value difference C-DI between the time differences C and D, further calculate 1/2 of this, set Ic-Dl/2 as the control amount, and point the point in time 23 at which LSY-A occurs with the arrow By controlling this in the direction of speeding up the signal and setting this as the generation point 25, the generation points 21 and 25 match, and the respective reception points 22 and 26 also match, so that LSY-A is completely synchronized. .

In contrast to the above, Mon) is a case where the time difference C, D is C) D, and the occurrence time 23 of the local station appears earlier than the occurrence time 21 of the upper station U, so similarly, the control amount 1 cmD1 /2 is determined, and by controlling the occurrence point 23 to become later as shown by the arrow, and making this the occurrence point 25, a complete synchronization state is achieved.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, the time difference between the synchronization signals of the upper station and the own station is determined individually in the upper station and the own station, and the synchronization signal of the own station is determined by comparing the two time differences. In addition to determining the time direction for controlling the time difference, the time point at which the synchronization signal of the local station is emitted or lost is controlled according to this temporal direction and the average absolute value of the difference between the two time differences, and this control is applied to the power-on of the local station. As a result, the synchronization signal of the local station immediately becomes synchronized with the synchronization signal of the higher-level station in response to power-on, so data can be sent and received immediately. A remarkable effect can be obtained in a method in which the synchronization signal of each station is synchronized with the synchronization signal of the upper station.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, FIG. 1 is a block diagram, FIG. 2 is a timing chart of the control situation,
FIG. 3 is a block diagram of a conventional example. 1... Oscillator, 2... Automatic phase control circuit, 3...
... Frequency dividing circuit, 4... Time measurement circuit, 5...
Receiving section, 7...Power-on detection circuit, 8...Absolute value difference detection circuit, 9...Control direction detection circuit, 10...
・・Pulse generation circuit, A・・Synchronization signal of own station, B・
...Synchronization signal from the upper station.

Claims (1)

[Claims] In a method of synchronizing a synchronization signal of a local station with a synchronization signal of an upper station, an absolute value difference detection circuit which inputs the time difference with the synchronization signal from the own station, calculates the absolute value of the difference between the two time differences, and calculates the average of the absolute values; a control direction detection circuit for determining a temporal direction for controlling a synchronization signal; and a pulse for sending out a control pulse for controlling the time point at which the synchronization signal of the own station is generated according to the output of the detection circuit and the average of the absolute values. 1. An instant synchronization method for synchronization signals, comprising: a generation circuit; and a power-on detection circuit that starts the operation of each of the circuits in response to power-on of its own station.