| 摘要 |
A system comprises a master unit being configured to be operable to at least transmit and receive signals, determine signal levels of received signals, and activate an alarm for received signal levels below a predetermined level. The master unit at least comprises a processing unit, a port for communicating with computing devices, and a speaker unit for producing an audible alarm. At least two slave units are configured to be operable to at least transmit and receive signals, determine signal levels of received signals, and activate an alarm for received signal levels below a predetermined level and for signal content indicating an alarm. Each of the slave units comprises a processing, a port for communicating with computing devices, and a speaker unit for producing an audible alarm. The master unit communicates separately with each of the slave units. |
| 主权项 |
1. A system comprising:
a master unit being configured to be operable to at least transmit and receive signals, determine signal levels of received signals, and activate an alarm for received signal levels below a predetermined level, said master unit at least comprising: a processing unit being configured to be operable to control transmission and reception on multiple frequencies, and to process transmitted and received signals, a port for communicating with computing devices, and a speaker unit for producing an audible alarm; and at least one slave unit being configured to be operable to at least transmit and receive signals, determine signal levels of received signals, and activate an alarm for received signal levels below a predetermined level and for signal content indicating an alarm, each of said slave units comprising: a processing unit being configured to be operable to control transmission and reception with said master unit, and to process transmitted and received signals, a port for communicating with computing devices, and a speaker unit for producing an audible alarm, said master unit communicating separately with each of said slave units. |
