Telecommunications – Transmitter and receiver at separate stations – Having diverse art device
Reexamination Certificate
1998-12-21
2001-08-14
Legree, Tracy (Department: 2681)
Telecommunications
Transmitter and receiver at separate stations
Having diverse art device
C455S039000, C455S091000
Reexamination Certificate
active
06275682
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a radio frequency (RF) signal transmitting device, and more particularly to an RF signal transmitting device for transmitting signals between a computer and a plurality of wireless peripheral equipment.
BACKGROUND OF THE INVENTION
The personal computer has become an indispensable tool for modern people. The kind and application of peripheral equipment are diversified as the function of the personal computer becomes more powerful. For example, an input device has evolved from a conventional keyboard to a mouse essential for windows software, a joystick for playing a game, or even a handwritten input device and a voice input device. Those peripheral equipment fully occupy their user s work table. However, the convenience for a user to use a personal computer is quite restricted owing to the close and numerous connection cables between a personal computer and its peripheral equipment.
To overcome the above-mentioned drawback so as to increase the convenience in activity for a user, a manner of wireless connection between a personal computer and its peripheral equipment has been developed. For example, a wireless signal transmission was proposed by utilizing infrared rays due to its simply manufacturing method and low cost. However, there exists inconvenience and shortcoming because of its broadly directional characteristic and its transmission path being subject to be blocked by other matters. Thus another manner of wireless signal transmission using RF is developed and is extensively used now.
Please refer to
FIG. 1
which is a block diagram showing a prior RF wireless manner of performing the connection and signal transmission between a personal computer
10
and each of peripheral equipment, respectively. Many kind of peripheral equipment are commonly used with the computer, such as a mouse device
11
, a keyboard device
12
, and a joystick
13
, etc. At present, the prior wireless manner uses respective RF transmitters
111
,
121
,
131
and receivers
112
,
122
,
123
for performing the signal transmission. Apparently, the number of signal receivers needed for the signal transmission increases along with the number of peripheral equipment in use. That causes high cost, difficulty in the unification of hardware, and low operation rate. Therefore, it is tried by the applicant to deal with the situation encountered by the prior art.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a single RF signal transmitting device for transmitting signals between a computer and a plurality of wireless peripheral equipment.
According to the present invention, the RF signal transmitting device includes (a) a plurality of RF signal transmitters electrically connected to the plurality of wireless peripheral equipment respectively, each of which is provided for modulating an output signal therefrom into an RF signal with a specific carrier frequency and transmitting the RF signal and (b) an RF signal receiver electrically connected to the computer for synchronously receiving the RF signals from the RF signal transmitters and converting each of them to an operating signal to operate the computer.
In accordance with another aspect of the present invention, the RF signal receiver further includes (a) a receiving antenna for receiving the RF signals synchronously, (b) a frequency reducer electrically connected to the receiving antenna for converting the RF signals to a plurality of intermediate frequency signals by decreasing the carrier frequencies of the RF signals, (c) a demodulator electrically connected to the frequency reducer for distinguishing and demodulating the intermediate frequency signals so as to obtain respective the output signals from the plurality of wireless peripheral equipment, and (d) a converting unit electrically connected to the demodulator for converting the output signals into the operating signals to operate the computer.
In accordance with another aspect of the present invention, the frequency reducer further includes an RF amplifier electrically connected to the receiving antenna for amplifying the RF signals to increase a signal-to-noise ratio of the RF signals, and a frequency-converting circuit electrically connected to the RF amplifier for converting the amplified RF signals into the plurality of intermediate frequency signals, correspondingly.
In accordance with another aspect of the present invention, the RF amplifier includes a high-pass filter electrically connected to the receiving antenna for filtering the RE signals to block a low frequency noise included in the RF signals, and a first amplify unit electrically connected to the high-pass filter for increasing the amplitude of the filtered RF signals.
In accordance with another aspect of the present invention, the frequency-converting circuit includes a local oscillator providing an oscillatory signal with a constant frequency, and a mixer electrically connected to the first amplifying unit and the local oscillator for mixing plurality of intermediate frequency signals equal to the differences between the RF signals and the oscillatory signal.
In accordance with another aspect of the present invention, the constant frequency is 896 MHz.
In accordance with another aspect of the present invention, the demodulator includes a plurality of bandpass filters electrically connected to the frequency reducer, each of which passes a corresponding one of the intermediate frequency signals, and blocking others of the intermediate frequency signals, a plurality of second amplifing units each electrically connected to a corresponding one of the bandpass filters for amplifying the corresponding intermediate frequency signal, and a plurality of demodulating units each of which is electrically connected to a corresponding one of the second amplifying units for demodulating the corresponding intermediate frequency signal so as to obtain the output signals.
In accordance with another aspect of the present invention, the converting unit is a microprocessor for converting the obtained output signals to the operating signals for the computer.
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Lee Cheng-Kang
Pan Ching-Wen
Yen An-Yu
Gelin Jean A
Laff, Whitesel & Saret, Ltd.
Legree Tracy
RF-Link Systems Inc.
Whitesel J. Warren
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