Title:
【発明の名称】周波数分割多重化から時分割多重化に変換する装置および方法
Document Type and Number:
Japanese Patent JPH03502751
Kind Code:
A
Abstract:
Apparatus for converting a frequency division multiplex (fdm) signal to a time domain multiplex (tdm) signal in which a voltage controlled oscillator (21) whose output is a staircase of reference frequencies mixed by a mixer (20) with a received fdm signal. Each received frequency is output in turn at a common intermediate frequency from a bandpass filter 22 thereby forming a fdm signal after passing through a demodulator (23) and low pass filter (24). The conversion may take place in the optical domain by mixing optical reference frequencies with an optical fdm signal in, for example, a coherent heterodyne optical receiver.
Inventors:
Smith, David William
Hill, Gotthardley Litchiard
Robette, Roy Andriyu
Hill, Gotthardley Litchiard
Robette, Roy Andriyu
Application Number:
JP50947388A
Publication Date:
June 20, 1991
Filing Date:
November 28, 1988
Export Citation:
Assignee:
Buritetsushiu Telecomunications Public Limited Company
International Classes:
H04J3/00; H04J4/00; H04J14/02; H04J1/00; H04J14/08; H04J99/00; (IPC1-7): H04J1/00; H04J3/00
Domestic Patent References:
| JPS62257233A | 1987-11-09 | |||
| JPS61203750A | 1986-09-09 |
Attorney, Agent or Firm:
Takehiko Suzue (3 outside)