JPH07297858A - Proximity radio data communication equipment - Google Patents

Abstract

PURPOSE:To make a proximity radio data communication equipment small-sized and economical by using a double-current RZ pulse signal and transmitting and receiving it as a radio wave as it is without modulation/demodulation. CONSTITUTION:In a transmission/reception part S, a waveform conversion part 21 is provided between a signal processing part 3 and a power amplification part 5 instead of conventional carrier signal generation part and modulating part. The waveform conversion part 21 converts inputted binary data SD' into the double-current RZ pulse signal as a kind of a base band signal. A transmission antenna is directly excited by this base band signal to transmit a radio wave. In a reception part R, a waveform conversion part 22 which converts the double-current RZ pulse signal into a signal adapted to signal processing is provided between a waveform shaping part 11 and a signal processing part 12 instead of conventional demodulating part and carrier signal generation part. Thus, this equipment is made much more small-sized and economical as the whole than conventional because conventional carrier signal generation parts and relatively expensive modulation part and demodulation part are omitted and waveform conversion parts consist of small-sized and inexpensive IC logic circuits.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a near field wireless data communication device of several meters, and more particularly to a device for directly transmitting and receiving a baseband signal as a radio wave without modulating or demodulating.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional wireless data communication apparatus is composed of a transmission section S and a reception section R which are arranged in close proximity to each other. In the transmission unit S, the input data SD and the control signal CTL are externally input to the signal processing unit 3, and in synchronization with the clock signal CLK of the clock generation unit 2, error control data (bit error is detected and corrected in the transmission data SD. Data to be added) and the ID of the other party to send
A baseband signal SD 'is created by adding a number and is input to the modulator 4. In the modulating unit 4, the carrier signal supplied from the carrier signal generating unit 1 is modulated by the baseband signal SD ′, and the modulated signal (RF signal) is input to the power amplifying unit 5, amplified and supplied to the transmitting antenna 6. Then, the transmission radio wave SS is transmitted.

The received radio wave RS propagating to the receiving section R is received by the receiving antenna 7, amplified by the preamplifier 8 and input to the demodulating section 9. In the demodulation unit 9, the carrier signal generation unit 10
The received RF signal is demodulated (detected) by using the carrier signal supplied from the baseband signal and the signal RD ′ shaped by the waveform shaping unit 11 is input to the signal processing unit 12. In the signal processing unit 12, a clock is regenerated from the baseband input signal, the received data, the error control data and the ID number are detected using the clock, and further the error bit is detected and corrected. The reception data RD is output to the outside when its own ID number is detected.

The modulation methods are AM, FM and P.
M, PCM, and various methods combining these are used.

[0005]

When the conventional wireless data transmitter and receiver are mounted on a remote control device arranged close to each other and an electronic / electric device (including an AV device) controlled by the remote control device, Unlike the remote control method that uses infrared rays, it can be used even if the line of sight cannot be obtained between the transmitter (remote controller) and receiver, and it has the advantage that it can be used in a short distance without worrying about the directivity. Has been done.

By the way, recently, similar requests have been made to these wireless data communication devices as part of efforts to reduce the size and cost of the system. The present invention has been made to meet these demands for miniaturization and economy.

[0007]

[Means for Solving the Problems]

(1) The invention of claim 1 is a proximity wireless data communication device comprising a wireless data transmission unit and a wireless data reception unit, which are arranged in close proximity to each other and which directly propagates a baseband signal to space. The wireless data transmission unit adds a signal processing unit that adds error control data for error detection and correction and an ID number of a transmission destination to the input digital data and outputs the signal processing unit, and outputs the signal processing unit to a double-current RZ pulse signal. It is composed of a waveform converting section for converting and outputting, a power amplifying section for amplifying the output of the waveform converting section to a predetermined level, and a transmitting antenna which is excited by the output of the power amplifying section and transmits a corresponding radio wave.

The radio data receiving section includes a receiving antenna, a preamplifier for amplifying the output of the receiving antenna to a predetermined level, a waveform shaping section for shaping the output of the preamplifier, and an output of the waveform shaping section (double current RZ). Pulse signal) into a waveform suitable for data processing, and a signal processing unit that detects received data, error control data and ID number from the output of the waveform conversion unit, and detects and corrects error bits. Become.

(2) According to the invention of claim 2, in the close proximity wireless communication apparatus according to claim (1), the signal processing unit of the wireless data receiving unit reproduces the clock from the output of the waveform converting unit. It is a thing. (3) According to the invention of claim 3, in the close proximity wireless communication device according to (1) or (2), one wireless data transmitter and one wireless data receiver are installed in the same place. , One transmission / reception unit that can perform transmission and reception.

(4) According to the invention of claim 4, in the close proximity wireless communication apparatus according to claim (3), the transmitting / receiving section shares the transmitting antenna and the receiving antenna.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIG. 1 by giving the same reference numerals to the portions corresponding to those in FIG. In the wireless data communication device (comprising the transmitting unit S and the receiving unit R) of the present invention, modulation / demodulation using the carrier signal is not performed, and the baseband signal is directly emitted as a radio wave into space and detected by the receiving unit. .

In the transmission / reception section S, the conventional carrier signal generation section 1 and modulation section 4 of FIG. 4 are deleted, and instead the waveform conversion section 2 is replaced.
1 is provided between the signal processing unit 3 and the power amplification unit 5.
In the waveform conversion section 21, as shown in FIG.
The value data SD ′ (FIG. 2C) is converted into a double-flow RZ pulse signal (double-flow RZ signal having a particularly small duty ratio) which is a kind of baseband signal. The frequency spectrum distribution of the double flow RZ pulse signal is from DC to 100 MHz, for example.
The distance between the transmitter S and the receiver R is set to a proximity distance of about several meters or less in order to prevent the other electronic devices from being adversely affected, and the transmitted radio wave SS has an extremely weak electric field strength. Limited to.

According to the present invention, as described above, the transmitting unit has two
The value data is converted into a double-flow RZ pulse signal, and the baseband signal is used to directly excite the transmitting antenna to emit a radio wave. Therefore, in the receiver R, the conventional demodulator 9 and carrier signal generator 10 are deleted. Instead, a waveform conversion unit 22 that converts the double-flow RZ pulse signal into a signal suitable for signal processing is provided between the waveform shaping unit 11 and the signal processing unit 12.

The reception radio wave RS that has reached the reception section R after propagating in a very short distance is captured by the reception antenna 7 and is fed to the preamplifier 8
Is amplified to a predetermined level (for example, TTL level).
Since the output of the preamplifier 8 has a considerably distorted waveform as shown in FIG. 2D, it is shaped by the waveform shaping unit 11, and the waveform shown in FIG.
A double-flow RZ pulse signal such as This signal is converted into a signal suitable for signal processing in the waveform conversion section 22, for example, a single-flow NRZ signal shown in FIG. 2F, and is input to the signal processing section 12, where clock reproduction and ID number conversion are performed as described in the conventional example. When the detection or the like is performed and it is confirmed that the ID number is its own number, the reception data RD is output.

The polarity of the output of the waveform converter 21 of the transmitter S may be the polarity of FIG. 2B inverted. In the above description, the signal processing unit 12 reproduces the clock from the received data RD ′ and detects the data using the clock, but the present invention is not limited to the case where such a continuous synchronization system is used. An asynchronous method such as an asynchronous method may be used. In that case, the clock is not reproduced on the receiving side, and when the start of the start bit is detected for each character, each bit is detected at the timing on the receiving side.

Although only one receiver R is shown in FIG.
Generally, as shown in FIG. 3A, a plurality of receiving units NO. 1-NO. N is present. In the above description, the data is transmitted only in one direction, but in the case of bidirectional transmission, as shown in FIG. 3B, the transmission unit S and the reception unit R are combined to form one transmission / reception device. do it.
At that time, it is desirable to use the transmitting antenna 6 and the receiving antenna 7 in common so as to be economical. FIG. 3B shows a case where the system is configured with one master station and N slave stations. Of course, each of the master station and the slave station has a unique ID number.

[0017]

According to the present invention, unlike the conventional wireless data communication device, the double-current RZ pulse signal which is a kind of the base band signal is used, and it is transmitted / received as a radio wave as it is without any modulation / demodulation. Therefore, the conventional carrier signal generators 1 and 10 and the relatively expensive modulator 4 and demodulator 9 can be eliminated. Instead, the waveform converters 21 and 22 are required, but since they can be configured with a small and inexpensive IC logic circuit, it is possible to achieve a significantly smaller size and economy as a whole as a whole.

The device of the present invention can be mounted not only on the remote controller of the electronic / electrical device and the main body, but can also be mounted on the keyboard and main body of a personal computer, word processor, etc. to make both wireless and convenient. Can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an operation waveform diagram of a main part of FIG. However, D, E, and F show enlarged waveforms of the portion corresponding to the C binary data 101.

3A and 3B are block diagrams of a wireless data communication system for transmitting data unidirectionally or bidirectionally.

FIG. 4 is a block diagram of a conventional wireless data communication device.

Claims (4)

[Claims] 1. A proximity wireless data communication device comprising a wireless data transmission unit and a wireless data reception unit, which are arranged in close proximity to each other and which directly propagates a baseband signal to a space, wherein the wireless data transmission unit comprises: A signal processing unit that adds error control data for error detection and correction and the ID number of the transmission destination to the input digital data and outputs it, and a waveform conversion that converts the output of the signal processing unit into a double-current RZ pulse signal and outputs it. Section, a power amplification section that amplifies the output of the waveform conversion section to a predetermined level, and a transmission antenna that is excited by the output of the power amplification section and transmits a corresponding radio wave. A receiving antenna, a preamplifier that amplifies the output of the receiving antenna to a predetermined level, a waveform shaping section that shapes the output of the preamplifier, and an output of the waveform shaping section ( Waveform RZ pulse signal) into a waveform suitable for data processing, and a signal processing unit that detects received data, error control data and ID number from the output of the waveform conversion unit, and detects and corrects error bits. A close proximity wireless communication device. 2. The proximity wireless data communication device according to claim 1, wherein the signal processing unit of the wireless data receiving unit comprises:
The clock is reproduced from the output of the waveform conversion unit. 3. The near field wireless data communication device according to claim 1, wherein one wireless data transmitting unit and one wireless data receiving unit are installed at the same location to perform transmission and reception. It is characterized in that it comprises two transmitting and receiving units. 4. The near field wireless data communication apparatus according to claim 3, wherein the transmitting / receiving unit shares the transmitting antenna and the receiving antenna.