JPS5675766A - Tone signal generator - Google Patents

Tone signal generator

Info

Publication number
JPS5675766A
JPS5675766A JP15210379A JP15210379A JPS5675766A JP S5675766 A JPS5675766 A JP S5675766A JP 15210379 A JP15210379 A JP 15210379A JP 15210379 A JP15210379 A JP 15210379A JP S5675766 A JPS5675766 A JP S5675766A
Authority
JP
Japan
Prior art keywords
tone signal
pcm
selector
output
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
JP15210379A
Other languages
Japanese (ja)
Other versions
JPS6349952B2 (en
Inventor
Kazuto Hirose
Ryujiro Muramatsu
Hitoshi Imagawa
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.)
Hitachi Ltd
NTT Inc
Original Assignee
Hitachi Ltd
Nippon Telegraph and Telephone 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 Hitachi Ltd, Nippon Telegraph and Telephone Corp filed Critical Hitachi Ltd
Priority to JP15210379A priority Critical patent/JPS5675766A/en
Publication of JPS5675766A publication Critical patent/JPS5675766A/en
Publication of JPS6349952B2 publication Critical patent/JPS6349952B2/ja
Granted 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
    • 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)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To make unnecessary the addition of ROM for parity bit and to obtain an economical digital tone signal generator, by containing parity bits in 8-bit PCM code itself. CONSTITUTION:The signal ROM storing the sample of tone signal is addressed with a frame counter 1 clocked every sample period and the output is a serial PCM stream with a parallel serial converter 5. On the other hand, a selector 9 is controlled with the output of a counter 6 forming the intermittent signal of tone. The 1st input of this selector is the PCM stream and the 2nd input is the PCM pattern expressing the tone signal zero level. Of course, this pattern also satisfies the partity condition and the PCM stream of the tone signal with intermission is obtained from the output of the selector 9.
JP15210379A 1979-11-26 1979-11-26 Tone signal generator Granted JPS5675766A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15210379A JPS5675766A (en) 1979-11-26 1979-11-26 Tone signal generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15210379A JPS5675766A (en) 1979-11-26 1979-11-26 Tone signal generator

Publications (2)

Publication Number Publication Date
JPS5675766A true JPS5675766A (en) 1981-06-23
JPS6349952B2 JPS6349952B2 (en) 1988-10-06

Family

ID=15533111

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15210379A Granted JPS5675766A (en) 1979-11-26 1979-11-26 Tone signal generator

Country Status (1)

Country Link
JP (1) JPS5675766A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984002240A1 (en) * 1982-11-25 1984-06-07 Ericsson Telefon Ab L M Apparatus for providing tone signals in terminals for a digital telecommunnication system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984002240A1 (en) * 1982-11-25 1984-06-07 Ericsson Telefon Ab L M Apparatus for providing tone signals in terminals for a digital telecommunnication system

Also Published As

Publication number Publication date
JPS6349952B2 (en) 1988-10-06

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