| 摘要 |
<p>A multi-channel remote control transmitter for control of apparatus such as vehicle security systems, garage door openers, and the like has means for selecting one of many different channels or codes to be transmitted with a minimum number of control switches (34, 36). The transmitter includes at least one channel select switch (34) and a transmit switch (36). The user actuates the channel select switch (34) to select a desired channel, and then actuates the transmit switch (36) to actually transmit the selected channel code. The transmitter includes an audible (or visual) indicator (62) for confirming to the user the particular channel selected. The transmitter provides an audible "battery low" signal when the battery voltage drops below a predetermined level. A non-volatile memory (64) stores an M-bit base code with N least significant bits at zero. A microprocessor (50) reads the base code from the memory (64) and determines a code to be transmitted by a transmitter circuit (70) from the base code and a count of number of operation of the channel select switch (34).</p> |
