FR2447647A1 - Frequency generator for telephone system - provides mixed frequency signal from two programmable divider chains and mixer (BR 21.10.80) - Google Patents

Frequency generator for telephone system - provides mixed frequency signal from two programmable divider chains and mixer (BR 21.10.80)

Info

Publication number
FR2447647A1
FR2447647A1 FR7902027A FR7902027A FR2447647A1 FR 2447647 A1 FR2447647 A1 FR 2447647A1 FR 7902027 A FR7902027 A FR 7902027A FR 7902027 A FR7902027 A FR 7902027A FR 2447647 A1 FR2447647 A1 FR 2447647A1
Authority
FR
France
Prior art keywords
mixer
programmable divider
telephone system
diviser
programmable
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
FR7902027A
Other languages
French (fr)
Other versions
FR2447647B3 (en
Inventor
Bernard Zylberstejn-Lempel
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 FR7902027A priority Critical patent/FR2447647A1/en
Priority to BR8000494A priority patent/BR8000494A/en
Publication of FR2447647A1 publication Critical patent/FR2447647A1/en
Application granted granted Critical
Publication of FR2447647B3 publication Critical patent/FR2447647B3/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/02—Digital function generators
    • G06F1/03—Digital function generators working, at least partly, by table look-up
    • G06F1/0321—Waveform generators, i.e. devices for generating periodical functions of time, e.g. direct digital synthesizers
    • 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)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Transmitters (AREA)

Abstract

The frequency generator includes a programmable memory (MR) addressed using a coded combination (CE). An oscillator (OS) provides control pulses (ic). A frist division chain includes a programmable divider (DP1) controlled by the control pulses, which receives the coded combinations (CS) stored in the memory (MR) at the address defined by the coded combination (CE). The division chain also includes a fixed diviser (DS1) whose input is connected to the output of the programmable diviser, and a function generator circuit (GF1) whose input is connected to the diviser output (DS1). A second division chain is provided identical to the first ending in a second function generator circuit (GF2) which like the first is connected to a mixer (ML). An amplifying and filtering circuit (AF) receives the mixer output and provides the final output signal (af).
FR7902027A 1979-01-26 1979-01-26 Frequency generator for telephone system - provides mixed frequency signal from two programmable divider chains and mixer (BR 21.10.80) Granted FR2447647A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR7902027A FR2447647A1 (en) 1979-01-26 1979-01-26 Frequency generator for telephone system - provides mixed frequency signal from two programmable divider chains and mixer (BR 21.10.80)
BR8000494A BR8000494A (en) 1979-01-26 1980-01-25 FREQUENCY GENERATOR

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7902027A FR2447647A1 (en) 1979-01-26 1979-01-26 Frequency generator for telephone system - provides mixed frequency signal from two programmable divider chains and mixer (BR 21.10.80)

Publications (2)

Publication Number Publication Date
FR2447647A1 true FR2447647A1 (en) 1980-08-22
FR2447647B3 FR2447647B3 (en) 1981-10-16

Family

ID=9221245

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7902027A Granted FR2447647A1 (en) 1979-01-26 1979-01-26 Frequency generator for telephone system - provides mixed frequency signal from two programmable divider chains and mixer (BR 21.10.80)

Country Status (2)

Country Link
BR (1) BR8000494A (en)
FR (1) FR2447647A1 (en)

Also Published As

Publication number Publication date
FR2447647B3 (en) 1981-10-16
BR8000494A (en) 1980-10-21

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