| 词条 | Recorder warning tone |
| 释义 |
In telecommunication, a recorder warning tone is a tone transmitted over a telephone line to indicate to the called party that the calling party is recording the conversation. In the United States, the recorder warning tone is a half-second burst of 1400 Hz applied every 15 seconds. The recorder warning tone is required by law to be generated as an integral part of any recording device used for the purpose and is required to be not under the control of the calling party. The tone is recorded together with the conversation. References
External links
1 : Telephony signals |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。