JP2989980B2 - Synchronization pull-in method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to the synchronization pull-in method apparatus, in particular the synchronization pull-in method in a digital highway signal receiving circuit and its device.

[0002]

2. Description of the Related Art A conventional digital highway signal receiving circuit detects a synchronizing signal from a data pattern in the data, generates a head signal of the data, and operates based on the head signal.

[0003]

The conventional digital highway signal receiving circuit operates with the generated head signal and must operate in such a manner that the reference time signal generated in the apparatus is ignored. Was. Therefore, there is a problem that the configuration of the external circuit is complicated.

[0004]

According to the present invention , synchronization information is detected from a data pattern in data of a received digital highway signal, a leading position of the data is detected, and a reference time signal unique to the device and the above-mentioned reference timing signal are detected. A synchronization pull-in method is characterized in that a shift from a head timing signal indicating a head position of data is calculated, and the stored data is read by a read signal output based on the calculation result.

According to the present invention , a storage unit for storing a received digital highway signal, a head position detection unit for detecting a head position of output data of the storage unit, a reference time signal unique to the device, and the data A read signal calculation unit that calculates a deviation from a head timing signal indicating a head position of the read signal and outputs a read signal, and a read control unit that reads the data from the storage unit based on the read signal.
A synchronization device is obtained .

[0006]

Next, the present invention will be described with reference to the drawings. Figure 1 is a block diagram of a synchronization pull-in apparatus according to an embodiment of the present onset bright, FIG. 2 is a time chart showing the operation in FIG.

The synchronization pull-in device of this embodiment includes a storage unit 1 for storing data a received from a digital highway, a head position detection unit 2 for detecting a head position of data b from the contents of the storage unit 1, and a device. A read signal calculating unit 3 for calculating a shift between the unique reference time signal e and a head time signal c indicating the head position of the data b and outputting a read signal d;
And a readout control unit 4 for reading out the data b from the storage unit 1 by means of

Next, the operation of this embodiment will be described with reference to FIG.

[0009] As shown in FIG.
, I1 constitute one cycle of data. The received data a is sequentially stored in the storage unit 1. Then, it is read from the storage unit 1 by the reference time signal e selected by the read control unit 4.

In this embodiment, as shown in FIG. 2, the reception data E1 is read from the reception data E1 at the time when the reference time signal e is inputted, and is received in one cycle until the next reference time signal e is inputted. ,..., I1, A2,.

The output data b (E1,..., I
1, A2,..., D2), the head position data A2 is detected by the head position detection unit 2, and the head timing signal c is input to the readout signal calculation unit 3.

The read signal calculating section 3 calculates a time T from the data A2 at the head position indicated by the head time signal c to the next reference time signal e, and sets the read signal to a position where the time T has elapsed from the position of the data A2. Generate d.

At this time, the read control unit 4 switches from the reference time signal e to the read signal d and outputs the read signal d to the storage unit 2, and the data E2 at this time is read from the storage unit 1; The data F2 to F2 are sequentially read.

As a result, the data string of the received data a is adjusted to the reference time signal e, and the output data b
Are synchronized with the reference timing signal e.

[0015]

The present invention described above, according to the present invention detects the synchronization information from the data pattern in the data of the received digital highway signal, detects the head position of the data, device specific reference timing signal and the upper Symbol calculating a deviation between the first timing signal indicating the head position of the data by reading the data by Riki憶the read signal is output based on the calculation result, the received data sequence a reference timing signal of the own apparatus , The configuration of the external circuit can be relatively simplified.

[Brief description of the drawings]

1 is a blow <br/> click diagram of a synchronous pull-in apparatus according to an embodiment of the present onset bright.

FIG. 2 is a time chart showing the operation in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage part 2 Head position detection part 3 Read signal calculation part 4 Read control part a Received data b Output data of a storage part c Head position signal d Read signal e Reference time signal

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Koichi Goto 1-4-2, Mita, Minato-ku, Tokyo Within NEC Communication Systems Co., Ltd. (56) References JP-A-4-351786 (JP, A) (58 ) Surveyed field (Int.Cl. ⁶ , DB name) H04L 7/08 H04L 7/04

Claims (2)

(57) [Claims] 1. A method for detecting synchronization information from a data pattern in data of a received digital highway signal, detecting a start position of the data, and determining a reference time signal unique to the device and a start time signal indicating the start position of the data. synchronization pull-in method characterized by the deviation is calculated, it reads the data described above stored by a read signal which is output based on the calculation result. 2. A storage unit for storing a received digital highway signal, a head position detection unit for detecting a head position of output data of the storage unit, a device-specific reference time signal and a head indicating the head position of the data. A synchronization pull-in device comprising: a read signal calculation unit that calculates a deviation from a timing signal and outputs a read signal; and a read control unit that reads the data from the storage unit based on the read signal.