JPS5494291A - Modulating system - Google Patents

Modulating system

Info

Publication number
JPS5494291A
JPS5494291A JP56678A JP56678A JPS5494291A JP S5494291 A JPS5494291 A JP S5494291A JP 56678 A JP56678 A JP 56678A JP 56678 A JP56678 A JP 56678A JP S5494291 A JPS5494291 A JP S5494291A
Authority
JP
Japan
Prior art keywords
waveform
pulse train
modulating signal
binary
linear
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.)
Granted
Application number
JP56678A
Other languages
Japanese (ja)
Other versions
JPS581555B2 (en
Inventor
Kazuo Tomita
Makoto Niino
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP53000566A priority Critical patent/JPS581555B2/en
Publication of JPS5494291A publication Critical patent/JPS5494291A/en
Publication of JPS581555B2 publication Critical patent/JPS581555B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)

Abstract

PURPOSE: To obtain the light output of an LED having been subjected to analog luminance modulation free from non-linear distortions by pulse-density-modulating the analog modulating signal to binary current pulse train of changing densities in proportion to the modulating signal.
CONSTITUTION: The analog modulating signal v(t) of the waveform (a) having been applied to terminal (a) is converted to the binary voltage pulse train of changing densities of pulses in proportion to the modulating signal with a PDM modulator 41. This binary pulse train is converted to a binary current pulse train by a driving circuit 42, which is then applied to a light emitting element (LED) 43, whereby the modulated light output L(t) such as the waveform (c) or (d) is obtained. The current-light converting characteristics of the LED are non-linear but the increase in its light output owing to cumulation of the driving current pulses in the time axis direction is linear and therefore the modulation outputs free from non-linear distortions like the waveform (c) may be obtained. The waveform (d) is neither the waveform having received distortions and may therefore be readily shaped with an LPF or the like after electric conversion on the receiving side. In this way, the system may be readily utilized for optical transmission of analog signals.
COPYRIGHT: (C)1979,JPO&Japio
JP53000566A 1978-01-09 1978-01-09 Modulation method Expired JPS581555B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53000566A JPS581555B2 (en) 1978-01-09 1978-01-09 Modulation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53000566A JPS581555B2 (en) 1978-01-09 1978-01-09 Modulation method

Publications (2)

Publication Number Publication Date
JPS5494291A true JPS5494291A (en) 1979-07-25
JPS581555B2 JPS581555B2 (en) 1983-01-11

Family

ID=11477257

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53000566A Expired JPS581555B2 (en) 1978-01-09 1978-01-09 Modulation method

Country Status (1)

Country Link
JP (1) JPS581555B2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50153593A (en) * 1974-05-29 1975-12-10
JPS51147983A (en) * 1975-06-14 1976-12-18 Fujitsu Ltd Driving circuit for light emission diode

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50153593A (en) * 1974-05-29 1975-12-10
JPS51147983A (en) * 1975-06-14 1976-12-18 Fujitsu Ltd Driving circuit for light emission diode

Also Published As

Publication number Publication date
JPS581555B2 (en) 1983-01-11

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