Power saving infrared keyboard transmission method

A method for transmitting data corresponding to actuation status of keys of a keyboard from a transmitter unit to a receiving module, wherein said transmitter unit includes a microprocessor, said method comprising the steps of:

• (a) coupling said microprocessor of said transmitter unit to the keyboard to receive therefrom data corresponding to actuation status of at least one key of the keyboard;
• (b) generating by said microprocessor a first transmission signal corresponding to said data received thereat, said first transmission signal including a leader code followed by a start code, and a series of data pulses following said start code, said data pulses representing said data corresponding to the actuation status of said at least one key of the keyboard,
• said leader code including a high level period and a low level period, durations of which are interrelated at a first predetermined ratio,
• said start code including a high level period and a low level period, durations of which are interrelated at a second predetermined ratio, and
• said series of data pulses including at least one data byte having eight data bits, said eight data bits having substantially identical pulse periods, and a parity code bit positioned at the end of said at least one data byte,
• wherein, for each said data bit representing a logic “1”, said pulse period has a duration not exceeding 600 μs, and for each said data bit representing a logic “0”, said pulse period includes a high level period and a low level period, each of a duration not exceeding 300 μs;
• (c) transmitting said first transmission signal to said receiving module;
• and
• (d) interrupting the transmission of said first transmission signal at a predetermined point of said pulse period of each said data bit to check the status of the transmission of each said data bit.