| 摘要 |
An acoustic alarm repeater system detects a coded alarm signal such as might be produced by a smoke detector or burglar alarm. The alarm signal can vary over a wide dynamic range since the signal will usually be greatly attenuated by intervening walls or floors. The system includes an electroacoustic transducer for converting the coded audible alarm signal into an electrical signal; an amplifier; and an autocorrelator for recognizing the presence of the repetitive characteristic of the coded acoustic alarm signal. Upon detecting the presence of the coded alarm signal, the system generates a new loud warning signal. The processing system may be designed to detect a wide variety of differently coded alarm signals. A dual repeater system recognizes the presence of two differently coded alarm signals, such as one produced by a smoke detector and the other produced by an intrusion alarm, and responds differently to each.
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