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參數資料
| 型號： | AN97 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | ECONOLINE: REC3-S_DRW(Z)/H* - 3W DIP Package- 1kVDC Isolation- Wide Input 2:1 & 4:1- Regulated Output- 100% Burned In- UL94V-0 Package Material- Continuous Short Circiut Protection- Efficiency to 80% |
| 中文描述： | 電話鈴聲發生器要求沒有修剪 |
| 文件頁數： | 1/5頁 |
| 文件大小： | 465K |
| 代理商： | AN97 |
Telephone Tone Generator Requires
No Trimming
Many products that connect to phone lines (modems, for instance) incorporate a "call-
progress monitoring" function known as CPM. CPM circuits "listen" to the lines as a
human would, and respond according to what they "hear." You shouldn't dial a number
unless you first hear a dial tone, for example. Neither should your computer.
Tone accuracy is not very important when people monitor the call-progress tones, but the
use of computers for this purpose has produced a need for tone-accuracy specifications to
prevent errors in interpretation. Accordingly, CCITT has introduced the North American
Precise Audible Tone Plan (the following data is from the CCITT Green Book, Volume
VI-4):
Figure 1
illustrates a simple circuit for generating single or dual tones. They must be
±0.5% accurate in frequency, and they must be gated as shown in the "Cadence" column
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