Nova Patents
JPS6216640A

Synchronization switching system

Abstract

PURPOSE:To minimize the generation of a phase discontinuity in case of switching by monitoring a phase difference of two signals by a phase comparing circuit, and switching a line of a sending end side of a stand-by radio line at the time point when its phase difference becomes some value or below. CONSTITUTION:By a control signal 101, a selecting circuit 13 selects a clock signal in a signal 104b (or 104c,...) of existing radio lines (b), (c),... to be switched, and applies it to a phase comparing circuit 14. The phase comparing circuit 14 compares the phases of a clock signal CLK in a signal 103 of a stand-by radio line (a) with a clock signal CLK of the existing radio line, and at the time point when its phase difference enters into some range determined in advance, a controlling circuit 15 is opened and the controlling signal 101 is applied to a switching circuit 16. As a result, the selected existing radio lines (b) (c,...) are switched to the stand-by radio line (a). Accordingly, the large phase discontinuity is not generated in the signal component of the stand-by radio line, the step-out of a clock and the carrier of a receiving side demodulating circuit can be prevented.

JPS6216640A, drawing sheet 1
Sheet 1 of 2

Term

Term ended

Projected expiry passed 16 July 2005, 21.2 years ago.

  1. Priority and filed
  2. Published
  3. Projected expiry
  4. Today

1 claim: 1 independent, 0 dependent

  1. 1
    【特許請求の範囲】 1、複数の現用無線回線と、少なくとも一つの予備無線回線と、該予備無線回線の送信側変調入力に設けられデータ及びクロック入力を切替える送信切替手段と、前記各現用無線回線の受信側復調出力に設けられ前記現用および予備無線回線の復調出力を同期して切替える同期切替手段と、前記予備無線回線の受信側復調出力に設けられ復調されたデータ及びタイミング信号を前記各同期切替手段に分岐する分配手段とを有し、現用・予備の切替を無瞬断・無符号誤りで行うディジタル無線通信系の同期切替方式において、前記送信切替手段は、切替回路を制御する制御回路と現用回線の信号を選択する選択回路と選択された現用回線の信号と予備回線の信号の位相差を比較する位相比較回路とを備え、該位相比較回路出力を前記切替回路制御に使用することを特徴とする同期切替方式。