JPH0559624B2 - - Google Patents
Info
- Publication number
- JPH0559624B2 JPH0559624B2 JP61310258A JP31025886A JPH0559624B2 JP H0559624 B2 JPH0559624 B2 JP H0559624B2 JP 61310258 A JP61310258 A JP 61310258A JP 31025886 A JP31025886 A JP 31025886A JP H0559624 B2 JPH0559624 B2 JP H0559624B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- synchronization
- synchronization signal
- circuit
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Synchronisation In Digital Transmission Systems (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は通信システムにおける同期方式に関
し、特に簡便な方法で同期をとる同期方式に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a synchronization method in a communication system, and particularly to a synchronization method that achieves synchronization using a simple method.
（従来の技術）
通信システムにおいて、送信側と受信側の伝送
信号の同期をとる従来の同期方式としては、送信
側からビツト同期信号とフレーム同期信号とを送
出して、受信側でそれぞれに応じてビツト同期回
路とフレーム同期回路とにより同期をとる方式で
ある。それぞれの同期回路の代表的なものとして
は、まずビツト同期回路についてはデジタル
PLL（フエーズロツクループ）方式があり、フレ
ーム同期回路についてはPN（疑似雑音）符号の
相関を利用したPN同期方式等がある。後者の
PN同期方式はPN符号を同期信号として用いる
もので、これを位相変調や周波数変調して送出
し、受信側で復調したのちPN符号の相関をとつ
て同期をとる方式である。第３図に上記の従来の
PN同期方式を用いた構成例を示す。１０はPN
信号発生器、１１は変調回路、１２は復調回路、
１３はフレーム同期回路、１４はビツト同期回路
である。また、第４図にはこのPN同期方式の同
期信号の波形例を示し、ａはPN符号の波形例、
ｂは該PN符号をPSK変調した場合の波形例であ
る。(Prior Art) In a communication system, the conventional synchronization method for synchronizing transmission signals on the transmitting side and the receiving side is to send out a bit synchronization signal and a frame synchronization signal from the transmitting side, and then transmit them on the receiving side in response to each signal. This method uses a bit synchronization circuit and a frame synchronization circuit to achieve synchronization. Typical examples of each type of synchronous circuit are the bit synchronous circuit, which is digital.
There is a PLL (phase lock loop) system, and for frame synchronization circuits, there is a PN synchronization system that uses the correlation of PN (pseudo-noise) codes. the latter
The PN synchronization method uses a PN code as a synchronization signal, which is phase-modulated or frequency-modulated, sent out, demodulated on the receiving side, and then synchronized by correlating the PN codes. Figure 3 shows the above conventional
An example of a configuration using the PN synchronization method is shown below. 10 is PN
a signal generator, 11 a modulation circuit, 12 a demodulation circuit,
13 is a frame synchronization circuit, and 14 is a bit synchronization circuit. In addition, Fig. 4 shows an example of the waveform of the synchronization signal of this PN synchronization method, where a is an example of the waveform of the PN code,
b is an example of a waveform when the PN code is PSK modulated.
（発明が解決しようとする問題点）
しかし従来の上述の方式では、十分な相関をも
つたPN符号を送るには、長い送信時間を必要と
する。従つて、音声帯域や狭帯域の伝送路におい
ては、十分な相関をもつたPN符号が送れない欠
点があつた。さらに、位相変調や周波数変調等の
同期信号の変復調回路と、受信側にフレーム同期
回路以外にビツト同期回路とを必要とするため
に、ハード量が多くなり、装置をコンパクトにす
ることができない等の欠点があつた。(Problems to be Solved by the Invention) However, in the above-described conventional method, a long transmission time is required to send PN codes with sufficient correlation. Therefore, there was a drawback that PN codes with sufficient correlation could not be sent over voice band or narrow band transmission paths. Furthermore, since a modulation/demodulation circuit for synchronization signals such as phase modulation and frequency modulation and a bit synchronization circuit in addition to a frame synchronization circuit are required on the receiving side, the amount of hardware increases and the device cannot be made compact. There were some shortcomings.
（問題点を解決するための手段）
本発明はこれらの欠点を解決するために、送信
側において任意の時間内で予め定められた関数に
従つて周波数を連続的に変化させた信号を同期信
号として発生させ、主伝送信号に直列に配列して
送信し、受信側では前記の送信側で生成した同期
信号と同一の信号を参照信号として発生させ、該
信号と送信側から送られて来た同期信号との相関
をとり、送られてくる主伝送信号のフレーム同期
をとつて、主伝送信号の受信をするようにしたも
のである。(Means for Solving the Problems) In order to solve these drawbacks, the present invention converts a signal whose frequency is continuously changed according to a predetermined function within an arbitrary time on the transmitting side into a synchronous signal. The synchronization signal is generated as a reference signal, arranged in series with the main transmission signal, and transmitted. On the receiving side, the same signal as the synchronization signal generated on the transmitting side is generated as a reference signal. The main transmission signal is received by correlating with the synchronization signal and synchronizing the frame of the main transmission signal sent.
（実施例）
第１図は本発明による同期方式を用いた一実施
例を示すブロツク図で、１は受信側の同期信号入
力端子、２は送られて来た同期信号を蓄積して並
列出力するシフトレジスタ、３はシフトレジスタ
２からの並列出力、４は並列出力３のパターンと
後記同期信号発生回路６からの並列出力５のパタ
ーンとを比較するパターン一致回路、５は同期信
号発生回路６からの並列出力、６は同期信号発生
回路、７は同期判定結果出力端子、８は送信側の
同期信号発生回路、９は送信側の同期信号出力端
子である。第２図は前記の同期信号の一波形例
で、ａは時間と周波数との関係を示す関数ｆ(t)の
曲線、ｂは曲線ａで周波数が変化する同期信号の
波形例である。(Embodiment) Fig. 1 is a block diagram showing an embodiment using the synchronization method according to the present invention, where 1 is a synchronization signal input terminal on the receiving side, and 2 is a terminal for accumulating the synchronization signals sent and outputting them in parallel. 3 is a parallel output from the shift register 2; 4 is a pattern matching circuit that compares the pattern of the parallel output 3 with the pattern of the parallel output 5 from the synchronization signal generation circuit 6, which will be described later; 5 is a synchronization signal generation circuit 6 6 is a synchronization signal generation circuit, 7 is a synchronization determination result output terminal, 8 is a transmission side synchronization signal generation circuit, and 9 is a transmission side synchronization signal output terminal. FIG. 2 shows an example of the waveform of the synchronizing signal described above, where a is a curve of the function f(t) showing the relationship between time and frequency, and b is an example of the waveform of the synchronizing signal whose frequency changes along the curve a.
（作用）
第１図において、送信側（Tx）の同期信号発
生回路８で、第２図に示すような任意の時間内で
周波数を連続的に変化させた信号を、同期信号と
して発生させ、同期信号出力端子９から出力す
る。ただし第１図では、同期信号に係わる入力端
子と出力端子だけを図示しており、伝送される主
伝送信号に係わる出力端子と入力端子とは図示さ
れていない。受信側（Rx）では、送信側から送
られてきた同期信号はサンプリング（図示せず）
された後に、同期信号入力端子１に入力される。
入力された同期信号はシフトレジスタ２に蓄積さ
れ、並列出力３が出力される。一方同期信号発生
回路６では、送信側の同期信号発生回路８で発生
した同期信号と同一の信号を発生し、上記サンプ
リングと同じ間隔でサンプリングされた信号の並
列出力５を出力する。このように、本方式は受信
側において同期信号がサンプリングされるので、
PN同期方式のようにビツト同期をとる必要がな
い。(Operation) In FIG. 1, the synchronization signal generation circuit 8 on the transmitting side (Tx) generates a signal whose frequency is continuously changed within an arbitrary time as shown in FIG. 2 as a synchronization signal, Output from the synchronization signal output terminal 9. However, in FIG. 1, only the input terminal and output terminal related to the synchronization signal are illustrated, and the output terminal and input terminal related to the main transmission signal to be transmitted are not illustrated. On the receiving side (Rx), the synchronization signal sent from the transmitting side is sampled (not shown).
After that, it is input to the synchronization signal input terminal 1.
The input synchronization signal is accumulated in the shift register 2, and a parallel output 3 is output. On the other hand, the synchronizing signal generating circuit 6 generates the same signal as the synchronizing signal generated by the transmitting side synchronizing signal generating circuit 8, and outputs parallel outputs 5 of signals sampled at the same intervals as the above-mentioned sampling. In this way, in this method, the synchronization signal is sampled on the receiving side, so
Unlike the PN synchronization method, there is no need to perform bit synchronization.
前記のシフトレジスタ２から出力された並列出
力３と、同期信号発生回路６から出力された並列
出力５とは、パターン一致回路４によつて比較が
行われ、その結果が同期判定結果出力端子７から
出力されて、伝送されてくる主伝送信号の同期を
とり、主伝送信号の受信を行う。この検出回路の
動作速度は上述のサンプリングの周波数に依存
し、実用的にはこの周波数をデータ伝送速度の数
倍程度とするのが適当である。 The parallel output 3 outputted from the shift register 2 and the parallel output 5 outputted from the synchronization signal generation circuit 6 are compared by the pattern matching circuit 4, and the result is sent to the synchronization determination result output terminal 7. The main transmission signal is synchronized with the main transmission signal output from and transmitted, and the main transmission signal is received. The operating speed of this detection circuit depends on the above-mentioned sampling frequency, and in practical terms, it is appropriate that this frequency be approximately several times the data transmission speed.
以上のように、同期信号として任意の時間で周
波数を連続的に変化させた信号を用いることで、
音声帯域や狭帯域の伝送路でも、限られた短い時
間内で十分な自己相関をもつた同期信号を送るこ
とが可能となる。すなわち、同期信号として連続
的な周波数の変化の状態自体が情報となつている
ので、PN同期方式と同様に低い信号対雑音比に
おいても検出が可能である。さらに、上記の同期
信号としては、周波数の低域から高域へ、または
高域から低域へ、周波数を直線的あるいは曲線的
に時間関数に従つて変化させてもよく、または、
低域から高域への変化と、高域から低域への変化
とを、種々に組み合わせて変化させてもよい。い
わゆるチヤープ波はその特定の場合である。 As mentioned above, by using a signal whose frequency changes continuously at an arbitrary time as a synchronization signal,
Even on voice band or narrowband transmission paths, it is possible to send synchronization signals with sufficient autocorrelation within a limited short time. That is, since the state of continuous frequency change itself is information as a synchronization signal, detection is possible even at a low signal-to-noise ratio, similar to the PN synchronization method. Further, the synchronization signal may vary the frequency linearly or curvedly from a low frequency range to a high frequency range or from a high frequency range to a low frequency range according to a time function, or
The change from the low range to the high range and the change from the high range to the low range may be changed in various combinations. The so-called chirp wave is a particular case.
（発明の効果）
以上説明したように、任意の時間内で周波数を
連続的に変化させることにより生成した信号を同
期信号とする本発明の同期方式は、音声帯域や狭
帯域の伝送路でも、十分な自己相関のある同期信
号を限られた短い時間内で伝送することができる
利点がある。また、従来のようにビツト同期回路
とフレーム同期回路の双方を必要とせず、さらに
PN符号のように低い周波数成分をもたないた
め、音声帯域伝送路のように低域周波数を通さな
い伝送路においても、サブキヤリア（副搬送波）
を用いた変調を行う必要がないので、そのための
位相変調や周波数変調等の変復調回路を必要とし
ない利点がある。このことは、ハード量が少なく
すむので、装置をコンパクトな構造とすることが
できる。(Effects of the Invention) As explained above, the synchronization method of the present invention, which uses a signal generated by continuously changing the frequency within an arbitrary time as a synchronization signal, can be used even on voice band or narrow band transmission lines. There is an advantage that a synchronization signal with sufficient autocorrelation can be transmitted within a limited short time. In addition, it does not require both a bit synchronization circuit and a frame synchronization circuit as in the past, and
Since it does not have low frequency components like a PN code, it can be used as a subcarrier (subcarrier) even in a transmission line that does not pass low frequencies, such as a voice band transmission line.
Since it is not necessary to perform modulation using , there is an advantage that modulation/demodulation circuits for phase modulation, frequency modulation, etc. are not required for this purpose. This allows the device to have a compact structure since the amount of hardware can be reduced.
第１図は本発明による同期方式を用いた一実施
例を示すブロツク図、第２図は本発明における同
期信号の一波形例で、ａは時間と周波数との関係
を示す曲線、ｂは同期信号の波形例、第３図は従
来のPN同期方式を用いた構成例を示すブロツク
図、第４図は従来のPN同期方式による同期信号
の波形例で、ａはPN符号の波形例、ｂは該PN
符号をPSK変調した場合の波形例である。
１……同期信号入力端子、２……シフトレジス
タ、３，５……並列出力、４……パターン一致回
路、６，８……同期信号発生回路、７……同期判
定結果出力端子、９……同期信号出力端子。
FIG. 1 is a block diagram showing an embodiment using the synchronization method according to the present invention, and FIG. 2 is an example of the waveform of a synchronization signal according to the present invention, where a is a curve showing the relationship between time and frequency, and b is a synchronization signal. Example of signal waveform. Figure 3 is a block diagram showing a configuration example using the conventional PN synchronization method. Figure 4 is an example of the waveform of a synchronization signal using the conventional PN synchronization method. a is an example of the waveform of a PN code, b is the corresponding PN
This is an example of a waveform when the code is PSK modulated. 1... Synchronization signal input terminal, 2... Shift register, 3, 5... Parallel output, 4... Pattern matching circuit, 6, 8... Synchronization signal generation circuit, 7... Synchronization determination result output terminal, 9... ...Sync signal output terminal.
Claims (1)
れた関数に従つて周波数を連続的に変化させた信
号を同期信号として発生させ、主伝送信号に直列
に配列して送信し、受信側において、前記同期信
号と同一の信号を参照信号として発生させ、該信
号と受信した前記同期信号との相関をとり同期判
定をし、その結果を用いて送信側と受信側のフレ
ーム同期をとることを特徴とする同期方式。1. On the transmitting side, a signal whose frequency is continuously changed according to a predetermined function within an arbitrary time is generated as a synchronizing signal, arranged in series with the main transmission signal and transmitted, and on the receiving side, A signal identical to the synchronization signal is generated as a reference signal, a correlation is made between the signal and the received synchronization signal to determine synchronization, and the result is used to synchronize frames between the transmitting side and the receiving side. A synchronization method that uses
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61310258A JPS63166334A (en) | 1986-12-27 | 1986-12-27 | Synchronizing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61310258A JPS63166334A (en) | 1986-12-27 | 1986-12-27 | Synchronizing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63166334A JPS63166334A (en) | 1988-07-09 |
| JPH0559624B2 true JPH0559624B2 (en) | 1993-08-31 |
Family
ID=18003080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61310258A Granted JPS63166334A (en) | 1986-12-27 | 1986-12-27 | Synchronizing system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63166334A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5007682B2 (en) | 2008-02-15 | 2012-08-22 | 信越半導体株式会社 | Cylindrical grinding apparatus and grinding method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5866442A (en) * | 1981-10-16 | 1983-04-20 | Fujitsu Ltd | Synchronizing circuit of optical highway frame |
| JPS5934202U (en) * | 1982-08-26 | 1984-03-02 | 三洋電機株式会社 | oven |
| JPS59128843A (en) * | 1983-01-12 | 1984-07-25 | Showa Electric Wire & Cable Co Ltd | System for transmitting supervisory signal |
-
1986
- 1986-12-27 JP JP61310258A patent/JPS63166334A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63166334A (en) | 1988-07-09 |
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