| 摘要 |
The transmission circuit enables transmission power to be minimized in order to conserve battery power. The equipment includes a GSA radio telephone (1) with a microprocessor (2) and a data memory (3), communicating with the GSM network, and a PC (11) to be connected to the Internet. The telephone includes an IR transmitter (4) for establishing a data link (20) with a receiver (12) on the PC, whilst a return link (21) is established by a transmitter (14) in the PC and a receiver (7) in the telephone. The telephone includes a circuit modulating the transmission power of the IR circuit in the telephone to raise it to a nominal level. A receipt indicating good reception is transmitted back by the PC, and the IR transmission level is then adjusted to minimum necessary to maintain a reliable connection between the two pieces of equipment, by following a progressive decrease in signal level. |
