JPS5724195A - Acoustic signal reproducing device for radio system - Google Patents

Acoustic signal reproducing device for radio system

Info

Publication number
JPS5724195A
JPS5724195A JP9914780A JP9914780A JPS5724195A JP S5724195 A JPS5724195 A JP S5724195A JP 9914780 A JP9914780 A JP 9914780A JP 9914780 A JP9914780 A JP 9914780A JP S5724195 A JPS5724195 A JP S5724195A
Authority
JP
Japan
Prior art keywords
light
modulated
signal
straight line
audio signal
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.)
Pending
Application number
JP9914780A
Other languages
Japanese (ja)
Inventor
Yoshinobu Nishikawa
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP9914780A priority Critical patent/JPS5724195A/en
Publication of JPS5724195A publication Critical patent/JPS5724195A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

PURPOSE:To increase the power supply efficiency with a simple constitution, by transmitting straight line poralized light obtained from an audio signal via a light emitting element to an optical isotropic substance, transmitting modulated light corresponding to a PWM signal modulated with the audio signal, and making photoelectric conversion and demodulation. CONSTITUTION:An acoustic signal read out 14 at the transmission side is inputted to a comparator 17, and a pulse signal with repetitive frequency equal to the frequency of a triangle wave 16 is modulated on the acoustic signal level to obtain a PWM signal. On the other hand, the light obtained via an LED 19 is inputted to a polarized element 22 for straight line poralization and to an optical isotropic substance 23 of specific nature. In this case, electric field is exerted by using a PWM signal and the poralized light direction is oscillated toward two directions. Modulated light is transmitted by eliminating one straight line poralization with a photodetector 24. At the reception side, the modulated light is in photoelectric conversion at a phototransistor 25, audio signal component only is picked up at an LPF 27 and it is reproduced at a speaker 28.
JP9914780A 1980-07-18 1980-07-18 Acoustic signal reproducing device for radio system Pending JPS5724195A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9914780A JPS5724195A (en) 1980-07-18 1980-07-18 Acoustic signal reproducing device for radio system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9914780A JPS5724195A (en) 1980-07-18 1980-07-18 Acoustic signal reproducing device for radio system

Publications (1)

Publication Number Publication Date
JPS5724195A true JPS5724195A (en) 1982-02-08

Family

ID=14239574

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9914780A Pending JPS5724195A (en) 1980-07-18 1980-07-18 Acoustic signal reproducing device for radio system

Country Status (1)

Country Link
JP (1) JPS5724195A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0316798U (en) * 1989-06-29 1991-02-19

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0316798U (en) * 1989-06-29 1991-02-19

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