| 发明名称 |
ELECTRONIC TONE RINGER, FOR TELEPHONE SUBSET |
| 摘要 |
An electronic tone ringer for use in telephone substations. This circuit operates in response to conventional ringing signals and generates a single tone alert signal interrupted at a low frequency. The audible tone alert signal is generated by a piezo-ceramic transducer. |
| 申请公布号 |
AU6528880(A) |
申请公布日期 |
1981.10.22 |
| 申请号 |
AU19800065288 |
申请日期 |
1980.12.11 |
| 申请人 |
GTE AUTOMATIC ELECTRIC LABORATORIES |
发明人 |
J.D. SUBLETTE;W. STOBBS |
| 分类号 |
H04M1/00;H04M19/04 |
主分类号 |
H04M1/00 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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