| 摘要 |
Audio signals generated by one device, such as a cellular telephone, an MP-3 device, a CD player or the like are transmitted to an RF receiver to be amplified and presented audibly. An RF transmitter is coupled to the device to receive the audio signals and also to a frequency selection interface. The frequency selection interface may be a menu driven interface, a keypad, hardware equipment for automatically selecting a frequency, or the like. The selected frequency is used to tune the RF transmitter and a user is informed as to what frequency the audio signals are available for listening.
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