| 摘要 |
The device is operable to activate, and maintain activated for a predetermined time period, a consumer-controlled apparatus, such as a goods dispensing apparatus. The device includes a self-contained signalling unit in the form of a lightweight, easily portable, cassette type magnetic tape reproducing unit in which a tape is wound from a supply reel to a take-up reel responsive to actuation of a start button. A series of coded signals are recorded along a predetermined length of the tape and correspond to programmed information, and the tape may have two tracks. A respective pick-up or reading head is associated with each track and is connected to a respective radio signal transmitter. After the tape passes the reading heads, it passes beneath an erase head and a filter head which, respectively, erase the recorded information and erase all random noises and spurious signals. The radio signal transmitters are high frequency transmitters which are crystal controlled as to their respective frequencies, and the information from the reading heads is supplied as low frequency modulations to the transmitted high frequency signals. A receiving unit includes respective receivers each tuned to one of the two transmitters and each followed by a respective modulator and a respective selective filter. The currents from the two filters operate associated relays which are operable to close switches in an activating circuit for the controlled apparatus, and to maintain the switches closed as long as signals are received by the receiver. |
