Wireless signaling system
AssigneeSharp Kabushiki Kaisha
InventorsJunji Tanaka, Katsunori Takeda
Life of this patent
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Abstract
A wireless signaling system includes a plurality of transmitters and a single receiver. The transmitter sequentially transmits serial data blocks to the receiver. Each data block includes a transmitter identification code and predetermined time intervals defining the beginning and end of the data block. The receiver receives the data block, detects the time intervals before and after the received data block to recognize reception of a complete data block, and checks the transmitter identification code included in the received data block to identify the transmitter.
Claims24
A wireless signaling system comprising:
- first and second transmitters each wirelessly transmitting serial frames of data each frame including identification information, each frame being divided into a series of bit strings each bit string including a start bit at the beginning of the bit string, data bits, a parity bit, and a stop bit at the end of the bit string, wherein the start and stop bits of consecutive bit strings are separated by a spacing time interval during which bits are not transmitted and each frame is separated from start and stop bits of adjacent frames by a preset time interval during which bits are not received, and
- a receiver for receiving a frame of wirelessly transmitted data from the first and second transmitters, detecting whether the received frame is separated from adjacent frames by the preset time interval during which bits are not received and whether the received bit strings within the received frame are separated by the spacing time interval during which bits are not transmitted, and decoding the identification information in the received frame.
A data processing system employing wireless signaling comprising:
- a keyboard including a first transmitter for wirelessly transmitting serial frames of data, each frame being separated from adjacent frames by a preset time interval during which data are not transmitted and including identification information;
- a optical character reader including a second transmitter for wirelessly transmitting serial frames of data, each frame being separated from adjacent frames by a preset time interval during which data are not transmitted and including identification information;
- and
- a word processor including a receiver for receiving a frame of wirelessly transmitted data from the first and second transmitters, detecting whether the received frame is separated from adjacent frames by the preset time interval, and decoding the identification information in the received frame.
Dependencies are inferred from the claim text.