GB1245714A - Improvements in or relating to tone generators - Google Patents

Improvements in or relating to tone generators

Info

Publication number
GB1245714A
GB1245714A GB5319269A GB5319269A GB1245714A GB 1245714 A GB1245714 A GB 1245714A GB 5319269 A GB5319269 A GB 5319269A GB 5319269 A GB5319269 A GB 5319269A GB 1245714 A GB1245714 A GB 1245714A
Authority
GB
United Kingdom
Prior art keywords
reed
leaf spring
tongue
spring
reeds
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
GB5319269A
Inventor
Bryan Edward Barry
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB5319269A priority Critical patent/GB1245714A/en
Publication of GB1245714A publication Critical patent/GB1245714A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits
    • B06B1/0223—Driving circuits for generating signals continuous in time
    • B06B1/0238—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave
    • B06B1/0246—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal
    • B06B1/0261—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal taken from a transducer or electrode connected to the driving transducer
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
    • H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
    • H03B5/323—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator the resonator having more than two terminals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
    • B06B2201/50—Application to a particular transducer type
    • B06B2201/55—Piezoelectric transducer

Abstract

1,245,714. Plate vibrators. STANDARD TELEPHONES & CABLES Ltd. 30 Oct., 1969, No. 53192/69. Heading G5J. [Also in Divisions H1 and H3-H5] A tone generator, e.g. for use in a telephone dialling system, comprises an electrically sustained vibratory reed 3 formed in part out of or mounted on a leaf spring 1, the vibration of the reed being normally suppressed by a damper 10 held in contact with the reed but excited when the leaf spring is snapped from one bowed state to another to remove the reed from the damper. In Fig. 2a, the leaf spring is snapped over by means of a push-button 9 acting on the spring via a resilient linkage 11; a return spring 8 acts in the opposite direction. In Fig. 3, integral portions 12, 13 and 14, 15 of the leaf spring perform respectively the functions of a return spring and a resilient linkage. A five-layer piezo-electric element, of which the vibratory reed tongue constitutes the central layer, has inner layers adjacent the reed tongue comprising lead zirconate titanate bonded to the tongue and outer metal layers forming the electrodes. Alternatively, in a seven-layer structure a metal-piezo-electric ceramic-metal sandwich may be bunded to each side of the reed tongue. The outer electrode layers are of graded composition varying from a Ni-Cr alloy to gold with the alloy adjacent the ceramic to enable the making of soldered connections. The transistor oscillator circuit by which the vibration of the reed is sustained comprises a two-transistor amplifier network, Fig. 4 (not shown), with integrating circuits (R1, C1 and R2, C2) ensuring adequate phase-shift in the feedback loop and also serving to suppress overtone frequencies. An additional emitterfollower stage may be included, Fig. 5 (not shown). A telephone dialling system may include two assemblies of tone generators, each assembly corresponding to a high frequency or a low frequency band having four reeds, the reeds in each assembly being connected in parallel in a common amplifier circuit.
GB5319269A 1969-10-30 1969-10-30 Improvements in or relating to tone generators Expired GB1245714A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5319269A GB1245714A (en) 1969-10-30 1969-10-30 Improvements in or relating to tone generators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5319269A GB1245714A (en) 1969-10-30 1969-10-30 Improvements in or relating to tone generators

Publications (1)

Publication Number Publication Date
GB1245714A true GB1245714A (en) 1971-09-08

Family

ID=10466952

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5319269A Expired GB1245714A (en) 1969-10-30 1969-10-30 Improvements in or relating to tone generators

Country Status (1)

Country Link
GB (1) GB1245714A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4195284A (en) * 1976-08-11 1980-03-25 Ward & Goldstone Limited Sound generator
GB2152312A (en) * 1983-11-01 1985-07-31 Motorola Inc Oscillator circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4195284A (en) * 1976-08-11 1980-03-25 Ward & Goldstone Limited Sound generator
GB2152312A (en) * 1983-11-01 1985-07-31 Motorola Inc Oscillator circuit

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