KR0170748B1 - Input device and method of wireless computer - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless computer input device and a method thereof, and more particularly, to an apparatus for processing data transmission between a computer main body and a computer input device using a high frequency signal. A pseudo noise generator which synthesizes a noise code and an original signal to generate a spread spectrum signal, and generates a pseudo noise code identical to that of a transmitter in the reception mode, and a pseudo noise generated by the pseudo noise generator in the transmission mode A modulator for high frequency modulation of a noise signal on a carrier wave to transmit a channel, and a modulator for high frequency modulation on a pseudo noise code generated by the pseudo noise generator in the reception mode and a signal received from an external channel on the modulator. The modulated pseudo noise code by combining the desired band And a demodulator for extracting a signal of a band received from the mixer and restoring the original signal data. According to the present invention, it is possible to prevent malfunction due to frequency crosstalk between adjacent systems, and to eliminate electromagnetic interference of a computer when using a wireless input device using high frequency through spread-band communication, which is resistant to noise. According to the present invention, the spreading band can be easily changed by adjusting the number of shift registers directly involved in frequency spreading.

Description

Wireless computer input device and its method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wireless computer input devices, and more particularly, to an apparatus and method for processing data transmission between a computer main body and an input device using high frequency. A computer system generally used is mainly composed of a main body, a monitor, and a keyboard, and each of them is connected to each other by a cable to exchange information. The cable required to configure one system is usually 4-5, and when a large number of systems are gathered, the burden is increased and the complexity is increased. In recent years, except for a power line connected to a computer main body, a monitor power supply and a connection cable with the main body have been reduced to one, and a main body and a monitor-integrated computer are also commercially available. However, input devices such as a keyboard and a mouse are connected to the main body by a cable without being integrated in consideration of the positional movement according to the user's convenience, but it is inconvenient for free movement along the length of the cable. As a solution to this problem, the concept of a wireless keyboard system using infrared or high frequency has been introduced, but the wireless input system using infrared has limitations when there are many obstacles, and the method using high frequency has advantages in comparison with each other. In order to use, there is a limitation of the frequency bandwidth, and when data is transmitted using the same frequency, it may cause interference to adjacent systems, and also may cause malfunctions due to noise caused by electromagnetic waves generated from a computer.

The technical problem of the present invention is to use a spread spectrum transmission method for data transmission between a computer main body and an input device using a high frequency, so that each system maintains the same carrier frequency in a spread frequency band. It is to provide a device capable of transmitting data through different frequency components.

1 is a conceptual diagram of a wireless input system according to the present invention.

2 is a spectral diagram for explaining the concept of spread spectrum.

3 is a block diagram showing the configuration of a spread spectrum system using a general direct sequence method.

4 is a block diagram showing the configuration of a computer wireless input device using spread spectrum according to the present invention.

FIG. 5A is a block diagram showing the configuration of a scrambler for generating pseudo noise in the pseudo noise (PN) generator of FIG.

FIG. 5B is a block diagram showing the configuration of an unscrambler for restoring the original signal in the pseudo noise (PN) generator of FIG.

6 is a block diagram showing an embodiment for setting the register initial values of FIGS. 5A and 5B.

In order to achieve the above object, an apparatus for processing data transmission and reception between a computer main body and a computer input device in accordance with the switching of a transmission / reception mode according to the present invention, comprising synthesizing a pseudo noise code and an original signal generated by a predetermined control in the transmission mode. A pseudo noise generator for generating a spread spectrum signal and generating a predetermined pseudo noise code identical to that of a transmitting side in the reception mode, a carrier oscillator for generating a carrier wave, and pseudo noise generated in the pseudo noise generator in the transmission mode. A modulator for high frequency modulation on a carrier wave of the carrier oscillation unit for transmission to a channel, and a modulator for high frequency modulation of a pseudo noise code generated by the pseudo noise generator in the reception mode in a carrier wave, and an external channel in the reception mode The signal received from the modulator And a demodulator for synthesizing the generated modulated pseudo noise code to generate a signal of a desired band, and extracting a signal of a band received from the mixer in the reception mode and restoring the original signal data. Is a wireless computer input device.

In the method for processing data transmission and reception between systems in accordance with the switching of the transmission and reception mode according to the present invention for achieving the above another problem, a signal spread by spreading the pseudo-noise code and the original signal generated by a predetermined control in the transmission mode A pseudo noise signal generating step of generating a pseudo pseudo code in the reception mode, a pseudo noise signal generated in the pseudo noise signal generating step in the transmission mode, and performing high frequency modulation on a carrier wave and transmitting the pseudo noise signal A signal synthesizing step of generating a signal of a desired band by synthesizing a high frequency signal generated in the modulation step by modulating a pseudo noise code generated in the pseudo noise generation step into a carrier wave; Extract the band signal in step Of a wireless computer input method comprising the steps of: demodulating the data signal to restore.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a conceptual diagram of a wireless input system according to the present invention. As shown in FIG. 1, the input device of the keyboard 120 and the mouse 110 is separated from the main body 130, thereby reducing the distance by the cable. In order to reduce constraints and increase ease of use, the apparatus 130 is configured to transmit data by attaching a device capable of transmitting and receiving Radio Frequency to the main body 130 and the input devices 110 and 120. In this case, the data input devices 110 and 120 include a high frequency modulation and demodulation system for wirelessly transmitting digital information to the main body 130 and receiving information such as reset, and an input device such as a keyboard 120 and a mouse 110. Connect to each other to be integrated to share the high frequency radio transceiver. The main body is also equipped with a frequency spreader (Scrambler) so that the modulated information transmitted from the input device is returned to the original information and the wireless input device can use various systems such as a synchronization signal without interference. In contrast, the demodulator includes an scrambler-like structure or an scrambler that performs the reverse operation to restore the spread signal to its original state.

2 is a spectrum diagram illustrating the concept of spread spectrum, (a) is white noise in the time domain, (b) is a frequency spectrum of white noise, and (c) is pseudo noise. Noise is a spectrum showing an autocorrelation function, (d) is a frequency spectrum of pseudo noise, (e) is a frequency spectrum of an original signal, and (f) is a frequency spectrum of a spread spectrum modulated signal.

Spread-band transmission is a concept originally introduced to transmit a large amount of information through a limited channel in the wireless communication field. Code Devision Multiple Access, a jamming or digital mobile telephone system, for disturbing communication of the other party for military purposes. It is widely used for communication. In addition, it is a method for solving problems such as radio frequency interference, crosstalk, and timing recovery that may occur when consecutive zero or one bit strings continue in digital communication. White noise, such as lightning, is a signal that occurs in a very short time in time as shown in (a) of FIG. 2, and when interpreted in the frequency plane, it appears to be white light because it contains all frequency components, and is infinite as in (b) of FIG. It has a frequency band of. Spread spectrum, or spread-band technology, is a technique for generating pseudo noise, which is artificially close to white light, by using such a property, to spread a predetermined frequency width. To generate this pseudo noise, a scrambler composed of shift registers is required, which is used in all demodulation systems. The signal generated by the pseudo noise has an autocorrelation function as shown in (c) of FIG. 2 and widens a constant band as shown in (d) of FIG. The amount of bandwidth to be expanded here depends on how much pseudo noise is generated so close to the white noise, which depends on the randomness of the bit stream generated by the scrambler. In addition, the size of the expanded bandwidth is directly related to the length of the register constituting the scrambler, and as the length of the register increases, the randomness increases. If the length (number) of the registers is n, N = 2N-1 is a repeated bit sequence (Pseudo Noise Sequence). By using the spread frequency band, information of several channels can be transmitted simultaneously without interference. (E) in FIG. 2 shows the frequency spectrum of the original signal, and (f) shows the frequency spectrum of the modulated signal spread using the pseudo noise. The spread spectrum method includes a direct sequence method and a frequency hopping method, but a direct sequence method is widely used.

3 is a block diagram showing the configuration of a spread spectrum system using a general direct sequence method.

As shown in FIG. 3, when viewed from the transmitting side, the carrier oscillator 130 generates a carrier to be used to modulate a signal, and the pseudo noise generator 330 generates a pseudo noise code of a digital bit string in a random pulse form. And the original signal are combined to generate a spread spectrum signal. The modulator 320 modulates the spread spectrum signal generated by the pseudo noise generator 330 into a carrier wave in the carrier oscillator 310. Here, the form of modulation may be amplitude modulation, frequency modulation, phase modulation. In the next receiver side, in order to recover the spread spectrum signal received through the wireless channel, a pseudo noise generator 370 and a modulator 350 having the same structure as the transmitter side are required. The modulator 350 modulates a predetermined intermediate frequency of the intermediate frequency generator 360 to a pseudo noise code generated by the pseudo noise generator 370. The signal received from the channel is amplified and multiplied by the same pseudo noise code used for modulation in the mixer 340, and then only the original carrier signal is extracted, and a band pass filter (BPF) 380 for baseband signal band extraction. Will pass). The baseband signal passing through the band pass filter (BPF) 380 restores the original signal at the demodulator 390.

4 is a block diagram showing the configuration of a computer wireless input device using spread spectrum according to the present invention. In the computer wireless input device 400 of FIG. 4, three contacts (a, b, c) are provided according to a transmission / reception mode. First and second switches SW1 and SW2 to be switched, a pseudo noise (PN) generator 416 to generate a pseudo noise code and synthesize the original signal, a carrier oscillator 420 to generate a carrier wave, and the pseudo noise (PN). Modulator 418 modulating a pseudo noise signal from generator 416 to a carrier wave of carrier oscillator 420 and transmitting it to a channel, and a signal received from computer body 450 from modulator 418 A mixer 414 which generates a high frequency signal by synthesizing with a pseudo noise signal, extracts only a signal of a desired band from a high frequency signal received from the mixer 414, restores original data, and transmits the original data to a keyboard and a mouse. Comprising an early 412, the computer main body side 450 has three contacts (a, b, c) to generate a third, fourth switch (SW3, SW4), a pseudo noise code switched according to the transmission and reception mode The pseudo noise (PN) generator 456 synthesized with the original signal, the carrier oscillator 458 for generating a carrier wave, and the pseudo noise signal from the pseudo noise (PN) generator 456 as a carrier of the carrier oscillator 458. A modulator 454 for modulating and transmitting a channel and a mixer 452 for generating a high frequency signal by combining data received from the computer wireless input device 400 with a modulated pseudo noise signal generated by the modulator 454. The demodulator 459 is configured to extract only a signal of a desired band from the high frequency signal received from the block 452 to restore original data, and then transmit the received high frequency signal to an internal CPU.

For the present invention, the same block is required for each of the computer main body 450 in which a central processing unit (CPU) for transmitting and receiving data and the computer input device 400 such as a keyboard and a mouse are respectively provided. The first, second, third, and fourth switches SW1, SW2, SW3, and SW4 are switched according to the transmission / reception mode to perform demodulation. The computer main body 450 and the computer input device 400 have opposite modes by switching the switches SW1, SW2, SW3, and SW4. That is, when the contact point b of the switches SW1 and SW2 is connected to the contact point c, the input device becomes the transmission mode and the computer main body 450 becomes the reception mode, on the contrary, the contact point b is the contact point a ), The input device is in the receive mode and the computer body 450 is in the transmit mode. When the power is turned on, in the transmission mode of the computer main body 450, the modulator 454 transmits a spread spectrum pseudo noise signal obtained by synthesizing the original signal generated from the pseudo noise (PN) generator 456 to the carrier oscillator 448. High frequency modulation is performed on the carrier wave and transmitted to the channel. In the wireless input device 400 receiving this, the switches SW1 and SW2 are in a reception mode (contact b is connected to contact a), and the pseudo noise generator 416 is a transmitting side of the computer main body 450. The same pseudo noise code as in the above is used. The mixer 452 combines the data received from the computer body 450 with the pseudo noise code modulated in the same way as the pseudo noise code generated by the modulator 418, and extracts only the original carrier signal. The desired band is found among the spread spectrum signals of the modulated pseudo noise signal. The demodulator 412 restores the spread spectrum signal output from the mixer 452 to the original signal. On the contrary, when data is input to the computer main body 450 through the computer input device 400, the reverse process is the above-described process.

5A is a block diagram showing the configuration of a scrambler for generating pseudo noise in the pseudo noise (PN) generators 416 and 456 of FIG. A first exclusive-oral gate 510 that performs an exclusive-OR operation on the outputs M'K-1, M'K-2, M'K-3, and M'K-4. And a second outputting the scramble signal M'K by performing an exclusive-OR operation on the output signal MK and the original signal MK at the first exclusive-oral gate 510. It consists of an exclusive-oral gate 520.

5B is a block diagram showing the configuration of an unscrambler for restoring the original signal in the pseudo noise (PN) generators 416 and 456 of FIG. A first exclusive-oral gate that performs an exclusive-OR operation on the outputs M'K-1, M'K-2, M'K-3, and M'K-4. 540, an exclusive-OR operation is performed on the output signal MK and the scramble signal M'K at the first exclusive-oral gate 540 to restore the original signal MK. It consists of a second exclusive-oal gate 560.

As shown in FIG. 5B, two of the outputs M'K-1, M'K-2, M'K-3, and M'K-4 of each register are connected to the first exclusive-oral gate. The exclusive-oral operation is performed by 510, and the calculated value MK and the input signal MK are again performed by the second exclusive-oral gate 520. In addition, by feeding back the output value M'K to the input of the register stage, the input signals are randomly mixed. In this process, frequency spreading occurs. Here, the pseudo noise code generated differs depending on how the initial values of the register stages 511, 512, 514, and 516 are set. For example, when there are four registers, that is, when n = 4, the pseudo noise code (Code) that can be generated is 24. = 16 kinds. Therefore, if the initial setting value of the register is set to the pseudo noise key of each computer system, even if up to 16 computers use the same modulation / demodulation frequency, the signals cannot be demodulated because different systems have different pseudo noise keys. In the spread frequency bandwidth caused by the pseudo noise, it is possible to recover the information of the own system without interference. The scrambler of FIG. 5B is the same as the scrambler of FIG. 5A, but recovers information through the reverse operation. The operation of scrambler and unscrambler is as follows.

M'K = MK + MK

M'K + MK = (MK + MK) + MK) = (MK + (MK + MK) = MK + 0 = MK

Equation 1 is an equation of FIG. 5a, and Equation 2 is an equation of FIG. 5b.

FIG. 6 illustrates an embodiment for setting the initial values of the registers of FIGS. 5A and 5B, and are connected to a power supply VDD and a ground VSS to adjust a pseudo noise key value externally. 610 and set (D) and reset by the D (DIP) switch 610, and consists of registers (622, 624, 626, 628) to receive data according to the clock (CLK). 6 is a circuit for setting a unique pseudo noise key value of each system proposed in the present invention so that the initial values of the registers 622, 624, 626, and 628 can be adjusted from the outside by the c switch 610. When there are four registers, that is, when n = 4, there are 24 = 16 pseudo noise codes that can be generated.

As described above, according to the present invention, by using a spread spectrum transmission method for data transmission between a computer main body and an input device using high frequency, data is transmitted through different frequency components in a spread frequency band while maintaining the same modulation / demodulation frequency for each system. It can prevent the malfunction due to the frequency crosstalk between adjacent systems, and it can eliminate the electromagnetic interference of the computer when using the wireless input device using the high frequency through the spread-band communication that is strong against noise. According to this, there is an advantage in that the spreading band can be easily changed by adjusting the number of shift registers directly involved in frequency spreading.

Claims (7)

An apparatus for processing data transmission and reception between a computer main body and a computer input device in accordance with switching of a transmission / reception mode, comprising: synthesizing a pseudo noise code and an original signal generated by a predetermined control in the transmission mode to generate a spread signal; A pseudo noise generator for generating a predetermined pseudo noise code identical to that of a transmitting side in a reception mode; A carrier oscillator for generating a carrier; The pseudo noise signal generated by the pseudo noise generator in the transmission mode is transmitted by a high frequency modulation to a channel by the carrier wave of the carrier oscillator, and the pseudo noise code generated by the pseudo noise generator in the reception mode is transmitted by the carrier oscillator. A modulator for high frequency modulation with a carrier; A mixer unit generating a signal of a desired band by synthesizing a modulated pseudo noise code generated by the modulator with a signal received from an external channel in the reception mode; And a demodulator for extracting a signal of a band received from the mixer in the reception mode and restoring the original signal data. 2. The apparatus of claim 1, wherein the pseudo noise generating unit comprises: a plurality of shift register units in which predetermined data is set; A first exclusive-oral unit configured to perform an exclusive-OR operation on a predetermined number of data in the plurality of shift register units; Exclusive-OR operation of the data and the input data in the first exclusive-oral unit, the second extract to return the calculated data to the plurality of shift register unit to output the scrambled data A wireless computer input device comprising a exclusive-oal portion. The apparatus of claim 1, wherein the pseudo noise generating unit comprises: a plurality of shift register units in which scrambled data to be input is sequentially set; A first exclusive-oral part which performs an exclusive-OR operation on data of the shift register part; And a second exclusive-oral part which performs an exclusive-OR operation on the output data and the scrambled data of the first exclusive-oral part and restores the original data. Computer input device. The apparatus of claim 2, wherein the shift register unit comprises: a plurality of switch units capable of adjusting a pseudo noise code value; And a plurality of registers which are set and reset by said switch and to which data is input in accordance with a clock. 4. The wireless computer input device according to claim 2 or 3, wherein the set initial value of the shift register is a unique noise generating key of the computer body and the computer input devices. A method of processing data transmission and reception between systems according to switching of a transmission / reception mode, comprising: synthesizing a pseudo noise code generated by a predetermined control in the transmission mode and an original signal to generate a spread spectrum signal; Generating a pseudo noise signal for generating a pseudo noise code; A modulation step of performing high frequency modulation on the pseudo noise signal generated in the pseudo noise signal generation step in the transmission mode by a carrier wave, and high frequency modulation on a pseudo noise code generated in the pseudo noise generation step in the reception mode by a carrier wave; A signal synthesizing step of synthesizing the received signal into a high frequency signal generated in the modulation step to generate a signal of a desired band; And a demodulating step of extracting a band signal in the signal synthesizing step and restoring the original signal data. 7. The wireless computer input device according to claim 6, wherein the pseudo noise code in the reception mode of the pseudo noise generating step is the same as the pseudo noise code on the transmitting side.