GB1320551A - Electroacoustic transducer - Google Patents

Electroacoustic transducer

Info

Publication number
GB1320551A
GB1320551A GB4572570A GB4572570A GB1320551A GB 1320551 A GB1320551 A GB 1320551A GB 4572570 A GB4572570 A GB 4572570A GB 4572570 A GB4572570 A GB 4572570A GB 1320551 A GB1320551 A GB 1320551A
Authority
GB
United Kingdom
Prior art keywords
pulse
pulses
timer
range gate
wedge
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
GB4572570A
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.)
SPX Corp
Original Assignee
General Signal Corp
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 General Signal Corp filed Critical General Signal Corp
Publication of GB1320551A publication Critical patent/GB1320551A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G01S7/292—Extracting wanted echo-signals
    • G01S7/2923—Extracting wanted echo-signals based on data belonging to a number of consecutive radar periods
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/04—Systems determining presence of a target
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/521—Constructional features
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/04—Detecting movement of traffic to be counted or controlled using optical or ultrasonic detectors
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • G10K11/28—Sound-focusing or directing, e.g. scanning using reflection, e.g. parabolic reflectors
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/13—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using electromagnetic driving means

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Electromagnetism (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

1320551 Ultrasonic vehicle detector GENERAL SIGNAL CORP 25 Sept 1970 [20 Oct 1969] 45725/70 Heading H4D A transducer means has associated therewith guide means for guiding the acoustic energy propagated by the transducer means through an elongate slot, thereby producing a line source such that the radiation pattern thereof is broader transverse to the slot than along. A system for detecting vehicles on a roadway, Fig. 2, comprises a transmit-receive transducer unit 15, suspended above the roadway, having beam pattern of elliptical cross-section. Time base generator 10 produces sync. pulses for transmitter pulse timer 22, producing 5 ms. pulses and range gate generator 11, producing a range gate inhibiting response to the transmitted pulse and any reflections from the road surface. Receiver pulse timer 23 passes pulses inside the range gate of duration more than 3 ms. and memory 24 stores the pulse until the end of the range gate. Detector 35 detects received pulses in two successive transmission periods and sets detector memory 19 which provides an output for an indicator and a release timer 20. Timer 20 is reset by every received pulse such that if no pulses are received in a predetermined time memory 19 is cleared. A similar system is described using only single pulse detection, but incorporating pulse length, amplitude and frequency discrimination (Fig. 1, not shown). Transducer 15, Fig. 5 comprises a ferro-magnetic base 40 supporting a magnet 38 and ferromagnetic polepieces 41, 46 which produce a magnetic field in annular gap 42. Diaphragm 45 carries a coil 44 in said gap which coil is connected to terminals 47. A signal applied to terminals 47 vibrates the diaphragm 45 and viceversa. The sound waves so produced are guided by removable members 52 and removable wedge 51, Fig. 8. The top edges of members 52 define with the walls of casing 48 a rectangular slot, which lies above the ridge 49 of wedge 51. In a device not falling within the scope of the invention, wedge 51 is replaced by bullet shaped insert (70, Fig. 11, not shown) and a plate having a rectangular slot fitted over the casing. This arrangement also produces the desired directional characteristic.
GB4572570A 1969-10-20 1970-09-25 Electroacoustic transducer Expired GB1320551A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US86762169A 1969-10-20 1969-10-20

Publications (1)

Publication Number Publication Date
GB1320551A true GB1320551A (en) 1973-06-13

Family

ID=25350140

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4572570A Expired GB1320551A (en) 1969-10-20 1970-09-25 Electroacoustic transducer

Country Status (3)

Country Link
US (1) US3672462A (en)
JP (1) JPS4918823B1 (en)
GB (1) GB1320551A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137749A (en) * 1983-04-07 1984-10-10 Healey Meters Limited Intruder Detection System

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3742442A (en) * 1971-09-30 1973-06-26 Pacific Techn Inc Acoustic object detection system
JPS50109715U (en) * 1974-02-20 1975-09-08
US4081786A (en) * 1976-08-16 1978-03-28 Etat Francais Represente Par Le Delegue Ministeriel Pour L'armement Hydrophone having a directive lobe in the form of a cardioid
US4385210A (en) * 1980-09-19 1983-05-24 Electro-Magnetic Corporation Electro-acoustic planar transducer
US4525604A (en) * 1983-06-07 1985-06-25 Electro-Voice, Incorporated Horn loudspeaker with convex diaphragm
US4882562A (en) * 1986-03-11 1989-11-21 Turbosound Limited Adaptor for coupling plural compression drivers to a common horn
US6516076B1 (en) 2000-07-12 2003-02-04 Atlas Sound, L.P. Modular horn loudspeaker

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1845768A (en) * 1929-01-08 1932-02-16 Stokes Stanley Loud speaker
US1823705A (en) * 1930-02-01 1931-09-15 Eugene A Widmann System of articulate sound reproduction
DE821371C (en) * 1949-06-28 1951-11-19 Electroacustic Ges M B H Electroacoustic transducer working according to the moving coil principle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137749A (en) * 1983-04-07 1984-10-10 Healey Meters Limited Intruder Detection System

Also Published As

Publication number Publication date
US3672462A (en) 1972-06-27
JPS4918823B1 (en) 1974-05-13

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee