FR2274172A1 - Identification cct for vehicle borne telephones - generates sinusoidal signal bursts of different frequencies - Google Patents

Identification cct for vehicle borne telephones - generates sinusoidal signal bursts of different frequencies

Info

Publication number
FR2274172A1
FR2274172A1 FR7419729A FR7419729A FR2274172A1 FR 2274172 A1 FR2274172 A1 FR 2274172A1 FR 7419729 A FR7419729 A FR 7419729A FR 7419729 A FR7419729 A FR 7419729A FR 2274172 A1 FR2274172 A1 FR 2274172A1
Authority
FR
France
Prior art keywords
identification
cct
telephones
different frequencies
sinusoidal 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.)
Granted
Application number
FR7419729A
Other languages
French (fr)
Other versions
FR2274172B1 (en
Inventor
Alain Himmelbauer
Daniel Ingratt
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.)
Philips Industrielle et Commerciale SA
Philips Industrial Components Inc
Original Assignee
Philips Industrielle et Commerciale SA
Philips Industrial Components Inc
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 Philips Industrielle et Commerciale SA, Philips Industrial Components Inc filed Critical Philips Industrielle et Commerciale SA
Priority to FR7419729A priority Critical patent/FR2274172A1/en
Publication of FR2274172A1 publication Critical patent/FR2274172A1/en
Application granted granted Critical
Publication of FR2274172B1 publication Critical patent/FR2274172B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices
    • H04W88/185—Selective call encoders for paging networks, e.g. paging centre devices
    • H04W88/188—Selective call encoders for paging networks, e.g. paging centre devices using frequency address codes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/80—Generating trains of sinusoidal oscillations
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • 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
    • H04M1/505—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 signals generated in digital form

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A generator producing 'N' separate trains or bursts of sinusoidal signals of differing frequencies, designed to simplify the circuitry to produce such signals, used in vehicle telephone identification, produces signals to conform with the requirements of the 'International Radiocommunications Consultative Committee'. The duration of such a burst is 100mSec, burst spacing is 5mSec and frequencies are in the 2KHz region. The generator is initiated from a single input to an access unit providing five outputs to a programming unit and frequency synthesiser. Train switching is accomplished electronically the output being delivered by a programmed attenuator controlled from the access unit.
FR7419729A 1974-06-07 1974-06-07 Identification cct for vehicle borne telephones - generates sinusoidal signal bursts of different frequencies Granted FR2274172A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7419729A FR2274172A1 (en) 1974-06-07 1974-06-07 Identification cct for vehicle borne telephones - generates sinusoidal signal bursts of different frequencies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7419729A FR2274172A1 (en) 1974-06-07 1974-06-07 Identification cct for vehicle borne telephones - generates sinusoidal signal bursts of different frequencies

Publications (2)

Publication Number Publication Date
FR2274172A1 true FR2274172A1 (en) 1976-01-02
FR2274172B1 FR2274172B1 (en) 1976-10-15

Family

ID=9139761

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7419729A Granted FR2274172A1 (en) 1974-06-07 1974-06-07 Identification cct for vehicle borne telephones - generates sinusoidal signal bursts of different frequencies

Country Status (1)

Country Link
FR (1) FR2274172A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0009317A1 (en) * 1978-09-18 1980-04-02 Motorola, Inc. Microprocessor tone synthesizer with reduced quantization error

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0009317A1 (en) * 1978-09-18 1980-04-02 Motorola, Inc. Microprocessor tone synthesizer with reduced quantization error

Also Published As

Publication number Publication date
FR2274172B1 (en) 1976-10-15

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Legal Events

Date Code Title Description
ST Notification of lapse