Abstract:
The wireless human input device comprises at least one wireless human transmitting unit and a wireless human receiving unit. The wireless human transmitting unit generates leading signals and data signals and transmits the signals to the wireless human receiving unit. The wireless human receiving unit receives all the leading signals and identifies the data signals based on the leading signals so as to distinguish the data signals being transmitted by which wireless human transmitting unit transmitted.

Description:
FIELD OF THE INVENTION  
       [0001]     The present invention is related to wireless human input device, and especially to a wireless human input device using different leading signals to prevent data interference.  
       BACKGROUND OF THE INVENTION  
       [0002]     U.S. Pat. No. 5,854,621 titled “WIRELESS MOUSE” discloses a communication system used to receive signals representing displacement action of a peripheral device, the communication system includes a first peripheral device and a receiving unit; wherein the first peripheral device must have a first nonvolatile memory device to store a first identifier, and the receiving unit has a second nonvolatile memory device to store the first identifier and authorized identifiers of other peripheral devices. The U.S. Pat. No. 5,854,621 can solve the problems of data interference in data transmission and receiving between the peripheral devices and receiving units, however, the peripheral devices for transmitting data must use nonvolatile memory devices to permanently store the identifiers. Due to U.S. Pat. No. 5,854,621 using the components of the nonvolatile memory devices, it causes increase of production cost and this is deficiency thereof.  
         [0003]     In view of above defect and deficiency involved in the prior art, the inventor of the present invention develops a wireless human input device that can overcome the problems of data interference even without the memory device.  
       SUMMARY OF THE INVENTION  
       [0004]     The present invention provides a wireless human input device, which allows a plurality of wireless human transmitting units to commonly share a wireless human receiving unit under a working frequency, can overcome data interference as well so that the wireless human receiving unit can smoothly receive and identify data transmitted from the wireless human transmitting unit.  
         [0005]     Therefore, in order to get the abovementioned object, the wireless human input device of the present invention comprise: a plurality of wireless human transmitting units and a wireless human receiving unit. The wireless human transmitting units are used for generating different leading signals and data signals sand transmitting the leading signals and the data signals to the wireless human receiving unit. The wireless human receiving unit is used for identifying each of the data signals being corresponding to which leading signal.  
         [0006]     These objects and other objects and advantages of the present invention will become more apparent upon reading of the following detailed description and the accompanying drawings in which: 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0007]      FIG. 1  is a diagram showing application of the present invention;  
         [0008]      FIG. 2  is a schematic view showing the hardware structure of a wireless human transmitting unit of the present invention;  
         [0009]      FIG. 3  is a schematic view showing the hardware structure of a wireless human receiving unit of the present invention;  
         [0010]      FIG. 4  is a schematic view showing the signals transmitted from a wireless human transmitting unit of the present invention;  
         [0011]      FIG. 5  is a waveform diagram of a leading signal used for a wireless mouse transmitting unit of the present invention; and  
         [0012]      FIG. 6  is a waveform diagram of a used for a wireless keyboard transmitting unit of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0013]      FIG. 1  is a diagram showing application of the present invention; wherein a wireless human input device  10  of the present invention mainly is composed of a plurality of wireless human transmitting units  11  and a wireless human receiving unit  13 . The wireless human receiving units  11  include a wireless keyboard transmitting unit  11 A, a wireless mouse transmitting unit  11 B, a wireless touch pad transmitting unit  11 C and etc. These wireless human transmitting units  11  use the same frequency to transmit data to the wireless human receiving unit  13  commonly. The common wireless human receiving unit  13  receives data emitted from the wireless human transmitting units  11  and the data can be identified respectively. Further, the wireless human receiving unit  13  clearly knows the data from which of these wireless human transmitting units  11 . Then, the data is sent to a corresponding driver in a computer  20  for further accessing.  
         [0014]      FIG. 2  is a schematic view showing the hardware structure of a wireless human transmitting unit of the present invention;  FIG. 3  is a schematic view showing the hardware structure of a wireless human receiving unit of the present invention and  FIG. 4  is a schematic view showing the signals transmitted from a wireless human transmitting unit of the present invention. The wireless human transmitting units  11  are mainly used to generate leading signals  111  and data signals  113 , and the signals  111 ,  113  are sent to the wireless human receiving unit  13 . The most important feature of the present invention is that the wireless human receiving units  13  can identify different corresponding wireless human transmitting units  11  by way of different leading signals  111 . The waveform diagram shown in  FIG. 5  is leading signal  111  generated by the wireless mouse transmitting unit and the waveform diagram shown in  FIG. 6  is leading signal  1113  generated by the wireless keyboard transmitting unit. The leading signal  1111  includes a waveform signal  1111 A with a wavelength of 300 μS, while the leading signal  1113  includes a waveform signal  1113 A with a wave length of 700 μS. Hence, in an aspect to the whole, the leading signal  1111  used on the wireless mouse transmitting unit  11 B and the leading signal  1113  used on the wireless keyboard transmitting unit  11 A are totally different. Once the common wireless human receiving unit  13  receives a data packet containing the leading signal  1111  and another data packet containing the leading signal  1113 , the wireless human receiving unit  13  can distinguish the two data packets according to the difference between the waveform signal  1111 A and the waveform signal  1113 A, namely, the wireless human receiving unit  13  can recognize data signal  1131  transmitted by the wireless mouse transmitting unit  11 B and data signal  1133  transmitted by the wireless keyboard transmitting unit  11 A.  
         [0015]     The leading signals  111  used in the wireless human transmitting units  11  of the present invention are generated from a first electronic circuit device  110  and the first electronic circuit device  110  can be a timer  110  of a micro controller in practice. The timer in the micro controller is set with different time parameters to generate the preceding waveform signal  1111 A with a waveform length of 300 μS and the waveform signal  1113 A with a waveform length of 700 μS.  
         [0016]     A second electronic circuit device  130  of the wireless human receiving unit  13  of the present invention can identify different leading signals  1111  and  1113  and the second electronic circuit device  130  can be a charging and discharging circuit, which contains capacitors and electronic components, for being able to have time parameters in practice. The second electronic circuit device  130  outputs low or high level signals  130 A according to the waveform signal  1111 A and the waveform signal  1113 A. For instance, a low level signal  130 A can be output based on the waveform signal  1111 A of 300 μS, and a high level signal  130 A can be output based on the waveform signal  1113 A of 700 μS.  
         [0017]     The preceding data signals  113  are mainly used to carry the data transmitted from the wireless human transmitting units  11  to the wireless human receiving unit  13 . Taking the wireless mouse as an example, the data signal  1131  of the wireless mouse transmitting unit  11 B contains coordinate displacement data of a cursor, the data of clicking or releasing the left key, the right key or the middle key, the data of rolling the roller and etc. Taking a wireless keyboard as an example, the data signal  1133  of the wireless keyboard transmitting unit  11 A contains the data of scan codes for one of the keys on the keyboard.  
         [0018]     By the fact that the present invention renders the wireless human transmitting units  11  to generate leading signals  111  by themselves for the units  11  being able to be identified, thereby there is completely no need to pack any identifier in the transmitting data packet. Hence, neither the wireless human transmitting units  11  nor the wireless human receiving unit  13  of the present invention needs additional memory components (such as EEPROM memory components) to store such an identifier. Accordingly, the present invention can simultaneously save I/O pins of the additional memory elements and have the efficiency of its related electronic elements improved evidently.  
         [0019]     The scope of the present invention is shown by the attached claims rather than the embodiment. Various modifications made within the meaning of an equivalent of the claims of the invention and within the claims are to be regarded to be in the scope of the present invention.