FR2350753A1 - Generation of telephone signalling frequencies - uses cyclical addressing of programmed memory at time base signal rate - Google Patents

Generation of telephone signalling frequencies - uses cyclical addressing of programmed memory at time base signal rate

Info

Publication number
FR2350753A1
FR2350753A1 FR7613123A FR7613123A FR2350753A1 FR 2350753 A1 FR2350753 A1 FR 2350753A1 FR 7613123 A FR7613123 A FR 7613123A FR 7613123 A FR7613123 A FR 7613123A FR 2350753 A1 FR2350753 A1 FR 2350753A1
Authority
FR
France
Prior art keywords
time base
frequencies
frequency
generation
programmed memory
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
FR7613123A
Other languages
French (fr)
Other versions
FR2350753B1 (en
Inventor
Xavier Chaveron
Pierre Boiteux
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.)
Constr Telephoniques
Original Assignee
Constr Telephoniques
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 Constr Telephoniques filed Critical Constr Telephoniques
Priority to FR7613123A priority Critical patent/FR2350753A1/en
Priority to ES458361A priority patent/ES458361A1/en
Publication of FR2350753A1 publication Critical patent/FR2350753A1/en
Application granted granted Critical
Publication of FR2350753B1 publication Critical patent/FR2350753B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/023—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone by reversing the polarity of the current at the exchange

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

Telephone signalling between exchanges requires a signal composed of two frequencies from six. A replay signal comprises a seventh frequency. These frequencies are generated using a programmed memory and addressing circuits. A signalling frequency generator comprises a time base circuit which generates time base signals at a particular frequency. These are applied to an address counter which provides addresses cyclically at the time base signal rate. A memory comprises elements containing binary of or 1 logic which are addressed by the counter. The relevant memory element contents are then applied to dividers at a rate determined by the period of time base frequency to produce output frequencies.
FR7613123A 1976-05-03 1976-05-03 Generation of telephone signalling frequencies - uses cyclical addressing of programmed memory at time base signal rate Granted FR2350753A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR7613123A FR2350753A1 (en) 1976-05-03 1976-05-03 Generation of telephone signalling frequencies - uses cyclical addressing of programmed memory at time base signal rate
ES458361A ES458361A1 (en) 1976-05-03 1977-05-02 Generation of telephone signalling frequencies - uses cyclical addressing of programmed memory at time base signal rate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7613123A FR2350753A1 (en) 1976-05-03 1976-05-03 Generation of telephone signalling frequencies - uses cyclical addressing of programmed memory at time base signal rate

Publications (2)

Publication Number Publication Date
FR2350753A1 true FR2350753A1 (en) 1977-12-02
FR2350753B1 FR2350753B1 (en) 1982-04-02

Family

ID=9172602

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7613123A Granted FR2350753A1 (en) 1976-05-03 1976-05-03 Generation of telephone signalling frequencies - uses cyclical addressing of programmed memory at time base signal rate

Country Status (2)

Country Link
ES (1) ES458361A1 (en)
FR (1) FR2350753A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2504754A1 (en) * 1981-04-27 1982-10-29 Thomson Csf Mat Tel Sequencer for ROMs in digital waveform generator - uses program in master ROM to control operational sequences from slave ROMs via clocked bistable multivibrator circuits

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
NV2420/76 *
NV700/73 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2504754A1 (en) * 1981-04-27 1982-10-29 Thomson Csf Mat Tel Sequencer for ROMs in digital waveform generator - uses program in master ROM to control operational sequences from slave ROMs via clocked bistable multivibrator circuits

Also Published As

Publication number Publication date
FR2350753B1 (en) 1982-04-02
ES458361A1 (en) 1978-02-16

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Legal Events

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