JPS57112174A - System for generating digital audible tone - Google Patents
System for generating digital audible toneInfo
- Publication number
- JPS57112174A JPS57112174A JP55187332A JP18733280A JPS57112174A JP S57112174 A JPS57112174 A JP S57112174A JP 55187332 A JP55187332 A JP 55187332A JP 18733280 A JP18733280 A JP 18733280A JP S57112174 A JPS57112174 A JP S57112174A
- Authority
- JP
- Japan
- Prior art keywords
- changing
- control data
- rom7
- circuit
- digital audible
- 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
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)
- Devices For Supply Of Signal Current (AREA)
Abstract
PURPOSE:To obtain a digital audible tone generating device which is adapted to control method corresponding to various symmetries without changing the circuit, by changing write data of a control data ROM. CONSTITUTION:An ROM7 for control data storage is provided newly, and control data corresponding to each symmetry is stored there, and contents of the ROM7 are decoded by a control circuit 8 to perform operations such as code inversion, UP/DOWN switching, count inhibition as required. Consequently, all digital audible tones different in frequency, symmetry, and the number of samples are generated without changing the circuit only by changing data recorded in the control data ROM7.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55187332A JPS57112174A (en) | 1980-12-29 | 1980-12-29 | System for generating digital audible tone |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55187332A JPS57112174A (en) | 1980-12-29 | 1980-12-29 | System for generating digital audible tone |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57112174A true JPS57112174A (en) | 1982-07-13 |
JPH0123026B2 JPH0123026B2 (en) | 1989-04-28 |
Family
ID=16204140
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55187332A Granted JPS57112174A (en) | 1980-12-29 | 1980-12-29 | System for generating digital audible tone |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57112174A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55115770A (en) * | 1979-02-28 | 1980-09-05 | Toshiba Corp | Tone signal production system |
-
1980
- 1980-12-29 JP JP55187332A patent/JPS57112174A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55115770A (en) * | 1979-02-28 | 1980-09-05 | Toshiba Corp | Tone signal production system |
Also Published As
Publication number | Publication date |
---|---|
JPH0123026B2 (en) | 1989-04-28 |
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