GB823311A - Device for detecting and repeating selectively sound signals emitted by overtaking vehicles - Google Patents

Device for detecting and repeating selectively sound signals emitted by overtaking vehicles

Info

Publication number
GB823311A
GB823311A GB13995/57A GB1399557A GB823311A GB 823311 A GB823311 A GB 823311A GB 13995/57 A GB13995/57 A GB 13995/57A GB 1399557 A GB1399557 A GB 1399557A GB 823311 A GB823311 A GB 823311A
Authority
GB
United Kingdom
Prior art keywords
transistor
clipper
pulses
transformer
diode
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.)
Expired
Application number
GB13995/57A
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.)
TELE F LUX
Original Assignee
TELE F LUX
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 TELE F LUX filed Critical TELE F LUX
Publication of GB823311A publication Critical patent/GB823311A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
    • G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

823,311. Detecting approach of overtaking vehicles. TELE F'LUX. May 2, 1957 [May 8, 1956], No. 13995/57. Class 118 (2). A repeater in the driver's cab responds only to sounds existing for a predetermined time and of a predetermined frequency range. The horns of following cars are thereby brought to the driver's notice. The sound of the horn is picked up by microphone 2 amplified by transistor 7, and passed to a clipper transistor 14 and further clipper 20. The CR coupling networks of the transistor discriminate against the lower frequencies. The square waves are partially differentiated by the transformer 22, the process being completed by the following circuit. Diode 30 shorts out the negative pulses and the positive pulses charge capacitor 34 through diode 31. The pulses are integrated against a bleed 35 and relay 36 is arranged to respond to pulse trains of more than 1 second to operate relay 39 and thus the light and buzzer 40, 41. In a modification (not shown) no frequency discrimination is practised in the amplifier and sine waves are fed to the transformer. Two diodes in series opposition with strapped cathodes are connected across the secondary and suitably biased to act as clipper diodes to produce square waves which are then rectified and integrated as previously described.
GB13995/57A 1956-05-08 1957-05-02 Device for detecting and repeating selectively sound signals emitted by overtaking vehicles Expired GB823311A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT823311X 1956-05-08

Publications (1)

Publication Number Publication Date
GB823311A true GB823311A (en) 1959-11-11

Family

ID=11317841

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13995/57A Expired GB823311A (en) 1956-05-08 1957-05-02 Device for detecting and repeating selectively sound signals emitted by overtaking vehicles

Country Status (1)

Country Link
GB (1) GB823311A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2392846A1 (en) * 1977-06-02 1978-12-29 Wandel & Goltermann SIGNALING PROCESS FOR VEHICLES ENTITLED TO PRIORITY AND DEVICE USED TO CARRY OUT THIS PROCEDURE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2392846A1 (en) * 1977-06-02 1978-12-29 Wandel & Goltermann SIGNALING PROCESS FOR VEHICLES ENTITLED TO PRIORITY AND DEVICE USED TO CARRY OUT THIS PROCEDURE

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