JPS568945A - Signal transmitter - Google Patents

Signal transmitter

Info

Publication number
JPS568945A
JPS568945A JP8414879A JP8414879A JPS568945A JP S568945 A JPS568945 A JP S568945A JP 8414879 A JP8414879 A JP 8414879A JP 8414879 A JP8414879 A JP 8414879A JP S568945 A JPS568945 A JP S568945A
Authority
JP
Japan
Prior art keywords
frequency
output
circuit
level
voltage
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
JP8414879A
Other languages
Japanese (ja)
Inventor
Masuo Nakajima
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP8414879A priority Critical patent/JPS568945A/en
Publication of JPS568945A publication Critical patent/JPS568945A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

PURPOSE:To evade erroneous detection due to noises on a transmission circuit by obtaining original information by receiving and judging a frequency-deviation modulated signal transmitted from a transmission part by a frequency/voltage converting circuit, level detecting circuit and deciding circuit. CONSTITUTION:When transmitted from a transmission part onto a transmission circuit, a signal of frequency fH, part of frequency-deviation modulated signal, is converted by frequency/voltage converting circuit 51 into a voltage (in a range between V3 and V4) that corresponds to frequency FH and its output is applied to both level detecting circuits 52 and 53. Only level detecting cir cuit 52 having a set level that corresponds to the voltage in the range between V3 and V4 detects it to generate output S1 of a high level and output S2 of level detect ing circuit 53 becomes low in level. At deciding part 35, the inverted signal of output S2 and the direct signal of output S1 are AND-ed and its output S3 is held high to obtain original information.
JP8414879A 1979-07-03 1979-07-03 Signal transmitter Pending JPS568945A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8414879A JPS568945A (en) 1979-07-03 1979-07-03 Signal transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8414879A JPS568945A (en) 1979-07-03 1979-07-03 Signal transmitter

Publications (1)

Publication Number Publication Date
JPS568945A true JPS568945A (en) 1981-01-29

Family

ID=13822409

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8414879A Pending JPS568945A (en) 1979-07-03 1979-07-03 Signal transmitter

Country Status (1)

Country Link
JP (1) JPS568945A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4747106B2 (en) * 2004-01-29 2011-08-17 コンティテヒ・ルフトフェーダージステーメ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング Spring elements for rail vehicles

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4929010A (en) * 1972-07-12 1974-03-15
JPS49122601A (en) * 1973-03-23 1974-11-22
JPS5027962A (en) * 1973-07-14 1975-03-22

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4929010A (en) * 1972-07-12 1974-03-15
JPS49122601A (en) * 1973-03-23 1974-11-22
JPS5027962A (en) * 1973-07-14 1975-03-22

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4747106B2 (en) * 2004-01-29 2011-08-17 コンティテヒ・ルフトフェーダージステーメ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング Spring elements for rail vehicles

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