JPH0766752A - Information processor - Google Patents

Abstract

PURPOSE:To provide an information processor capable of shortening the time required for communication at the time of transmitting/receiving data having a large amt. of information such as multi-valued color picture through radio waves. CONSTITUTION:Picture data stored in a transmission buffer 13 are modulated by a spread modulator 12 using a prescribed spread code generated from a spread code generator a14, meanwhile control data stored in a transmission buffer 18 are modulated by a spread modulator 17 using a prescribed spread code generated from a spread code generator b19. Outputs from these modulators 12, 17 are mutually mixed by a mixer 11, the result is mixed with a carrier generated from a local oscillator 15 by a mixer 16 and then transmitted from an antenna 1 through a shared equipment 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus, for example, an information processing apparatus having a wireless communication function.

[0002]

2. Description of the Related Art Conventionally, there is an information processing apparatus equipped with a communication device that utilizes wireless as a means for transmitting data such as image data. This is for transmitting image data or the like by connecting the information processing device to another information processing device or the like using wireless communication.

Also, a wireless LAN using a spread spectrum communication system has been proposed. An input / output device such as a reader, a printer, or a digital copying machine and a computer are also connected to this LAN.

[0004]

However, the above-mentioned conventional example has the following problems. In other words, it takes a long time to communicate when connecting to another information processing device or the like using wireless communication and transmitting / receiving a large amount of information such as a multi-valued color image using one reference code. There were serious drawbacks.

[0005]

However, the above-mentioned conventional example has the following problems. That is, code generating means for generating a plurality of reference codes, modulation means for respectively modulating a plurality of data by each of the reference codes generated by the code generating means, and a plurality of signals output from the modulating means. And a transmitting means for transmitting.

[0006]

With the above structure, it is possible to provide an information processing apparatus which modulates and transmits a plurality of data by each of the reference codes generated by the code generating means. For example, a multivalued color image or the like having a large amount of information can be provided. The time required for communication when transmitting and receiving data can be shortened.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An information processing apparatus according to an embodiment of the present invention will be described in detail below with reference to the drawings.

[0008]

[First Embodiment] A spread spectrum communication system is one of the communication systems. On the transmission side of this method, the baseband signal of digitized voice and image data that is generally transmitted is converted into a baseband signal having a much wider bandwidth than the original data by using a spread code such as a pseudo noise code. Convert. Further, the converted signal is modulated by a method such as PSK or FSK modulation to form and transmit a high frequency signal.

On the other hand, the receiving side demodulates the original data by using the same spreading code as the transmitting side to perform despreading that correlates with the received signal. 1 to 3 are diagrams showing an outline of the spread spectrum communication system used in this embodiment. Original data d1 input to the multipliers 6-1 and 6-11 on the transmission side shown in FIG.
Each of (t) and d2 (t) has a waveform shown in FIG. 2'and an example, and has a spectrum shown in FIG. 3 as an example. In addition,
The original data d1 (t) is an image signal and the original data d2 (t) is a control signal. In addition, the spreading codes P1 (t) and P2 (t), which are the other signals input to the multipliers 6-1, 6-11, have the waveforms shown in FIG. Has a spectrum showing. The spread code P (t) changes according to the original data d1.
The spectrum is much wider than that of FIG. 3 because it is much more intense than the changes of (t) and d2 (t).

In the multipliers 6-1, 6-11, the original data d
1 (t) and d2 (t) are spread by being multiplied by spreading codes P1 (t) and P2 (t), respectively. The outputs of the multipliers 6-1 and 6-11 have the waveforms of which an example is shown in FIG. 2 and ', and have a spectrum of the same bandwidth as that shown in FIG. Further, the output signals of the multipliers 6-1 and 6-11 are the mixer 6-2.
In, it is mixed with the carrier wave output from the local oscillator 6-3. The waveform of this carrier is shown in FIG. Mixer 6
The output of -2 has a waveform as an example in FIG. 2 and a spectrum as an example in FIG. 3, and is transmitted from the antenna 6-4.

In the spectrum of the signal captured in the antenna 6-5 on the receiving side, in addition to the required signal 61 transmitted by the transmitting side, as shown in FIG. The unnecessary signal 63 and the narrow band interference signal 64 transmitted by a station other than the communication partner are included. The received signal including these unwanted signals is
In the mixers 6-6 and 6-16, the same spreading codes P1 (t) and P2 (t) as those on the transmitting side are mixed and converted into a signal having a spectrum, an example of which is shown in FIG. That is, the required signal 61 corresponding to the spreading codes P1 (t) and P2 (t) in the received signal is despread and narrowed to the bandwidth of the original data. On the other hand, other signals, that is, unnecessary signals 63 and narrow band interference signals 64 from other stations that do not have the same spreading code are spread and converted into wide band signals.

The spreading code used for modulation and demodulation is
The communication channels are set and assigned so that the mutual correlation is sufficiently small. Therefore, even if the signals spread by different codes are despread and demodulated, they become wide band noise, so that the target signal can be taken out and multiple access by code division is possible. That is, the common frequency can be used in multiple communication channels.

The output signals of the mixers 6-6 and 6-16 pass through bandpass filters (hereinafter referred to as "BPF") 6-7 and 6-17 according to the bandwidth of the original data, Is converted into a narrow band signal having a spectrum as shown in FIG. further,
The narrow band signal is demodulated (hereinafter referred to as "DEM") 6-
At 8, 6-18, demodulation by normal PSK or the like is performed and image data or the like is reproduced.

FIG. 4 is a block diagram showing an example of the configuration of the transmitter / receiver portion of FIG. First, the case of transmitting image data and control data will be described. In the figure, the control unit 20 sends the image data to the transmission buffer 13 and the control data to the transmission buffer 18, respectively. The image data stored in the transmission buffer 13 is the spread code generator a1.
4 is modulated by the spreading modulator 12 with a predetermined spreading code generated from the control code stored in the transmission buffer 18 while the predetermined spreading code generated from the spreading code generator b19 is used to control the control data stored in the transmission buffer 18. , And is modulated by the spread modulator 17.

The outputs of the spread modulators 12 and 17 are mixed by the mixer 11 and further mixed with the carrier generated by the local oscillator 15 by the mixer 16, and then the duplexer 2 is used.
Is transmitted from the antenna 1 via the. In the above description, the image data may be processed by the transmission buffer 18 and the spread modulator 17, and the control data may be processed by the transmission buffer 13 and the spread modulator 12. Further, the data to be transmitted may be the image data or the control data. It is not limited to data.

Next, the case of receiving image data and control data will be described. The received signal captured by the antenna 1 is input to each of the mixers 3 and 4 via the duplexer 2, mixed with a predetermined spreading code generated by each of the spreading code generators 5 and 6, and the required signal in the received signal is received. The signal is despread. Each spreading code generator 5 and 6 generates the same spreading code as the spreading code generator on the transmitting side.
Here, although the method of synchronizing the spread codes on the transmitting side and the receiving side is omitted, for example, a convolver may be used for synchronization.

The signal despread by the mixer 3 or 4 is
Each is demodulated by the demodulator 7 or 8 and converted into digital data. This data is received in the receive buffer 9
Alternatively, the control unit 20 sequentially reads the image data from the reception buffer 9 and the control data from the reception buffer 10, for example. The received data is not limited to image data and control data.

As described above, according to the present embodiment, it is possible to expect an improvement in the data transmission rate by transmitting and receiving image data, control data, etc. using different channels at the same time. It is possible to significantly reduce the time required for communication when transmitting and receiving data having a large amount of information such as images.

[0019]

[Second Embodiment] An information processing apparatus according to a second embodiment of the present invention will be described below. FIG. 5 is a block diagram showing a configuration example of a transmission unit provided in the information processing apparatus according to the present embodiment. In the present embodiment, in the mixers 7-2 and 7-12, the carrier wave generated from the local oscillator 7-3 is used. The signals are superimposed, and the signals output from both mixers are mixed by the mixer 7-1 3 and transmitted.

Image data d1 (t) is generated in the same manner as in the first embodiment.
And the control data d2 (t) are multiplied by spreading codes P1 (t) and P2 (t) in multipliers 7-1 and 7-11, respectively, and the data are spread. The signals output from the multipliers 7-1 and 7-11 are mixed with the carrier waves generated from the local oscillator 7-3 in the mixers 7-2 and 7-12, and the signals output from both mixers are The signals are mixed by the mixer 7-13 and transmitted from the antenna 7-4.

Original data d1 (t), d2 (t), spreading codes P1 (t), P2
(t) and spread output (multiplier output) are shown in Fig. 2 respectively.
Assuming the same as' ,, ', and',
The output of the mixer 7-2 has the waveform shown in FIG. 6 (A), the output of the mixer 7-12 has the waveform shown in FIG. 6 (B), and the output of the mixer 7-13 has the waveform shown in FIG. 6 (C). Has a waveform as an example. In the above description, d1 (t) is the image data and d2 (t) is the control data, but d1 (t) may be the control data and d2 (t) may be the image data. The data is not limited to image data and control data.

As described above, according to this embodiment, it is possible to obtain substantially the same effect as that of the first embodiment.

[0023]

[Third Embodiment] An information processing apparatus according to a third embodiment of the present invention will be described below. FIG. 7 is a block diagram showing a configuration example of a transmission unit provided in the information processing apparatus according to the present embodiment. In the present embodiment, image data and control data are divided and transmitted. In the first and second embodiments, the original data d1 (t) is the image data and d2 (t) is the control data. However, in this embodiment, some bits of the image data or the control data Of the original data d3 (t), d4
(t).

In FIG. 7, 8-21 and 8-22 are data decoders, and 8-23 is a data divider. Here, V0 to V7 are, for example, 8-bit image data, and C0, C1, and C2 are color, magnification, position information, and other control data, both of which are sent from a control unit (not shown). Data divider 8-2
3 is image data calculated in advance by a control unit (not shown),
The input data is divided based on the amount of control data. It is desirable that this division be performed so that the transmission amount of each channel used for data transmission becomes equal. In this embodiment, in order to transmit V0 and V1 of the image data V0 to V7 together with the control data C0, C1 and C2, the data divider 8-23 outputs the divided signal dev from the control unit (not shown). Based on this, V0 and V1 are separated from the input image data.

The data V0, V1, C0 to C2 divided and output from the data divider 8-23 are converted into original data d3 (t) by the data decoder 8-21, and the data V2 to V7 are converted into the data decoder 8-22.
Is converted to original data d4 (t). Data decoder 8-2
The original data output from the output terminals 1, 8-22 are spread code P1 (t), by the multiplier 8-11 or 8-12 in the same manner as in the first embodiment.
After being multiplied by P2 (t), it is mixed with the carrier wave from the local oscillator 8-3 in the mixer 8-12 and transmitted from the antenna 8-4.

When the image signal is binary, the image data is, for example, only 1 bit of V0. Therefore, the data divider 8-23 sends the control data C0 and C1 to the data decoder 8-21, for example. Image data V0 and control data C2 are sent to the data decoder 8-22. Although an example of performing data transmission using two channels has been described in the above and the drawings, the present embodiment is not limited to this, and an arbitrary number of channels can be used, and the number of channels can be increased. If so, the time required for data transmission can be shortened. Further, it goes without saying that the data to be transmitted is not limited to the image data and the control data and may be wired communication as well as wireless communication.

As described above, according to this embodiment,
Image data, control data, etc. are divided and transmitted so that the transmission amount of channels used for data transmission is approximately equal, so communication is required when transmitting and receiving data with a large amount of information such as multi-value color images. The time can be greatly reduced. The present invention may be applied to a system including a plurality of devices or an apparatus including a single device.

Needless to say, the present invention can also be applied to the case where it is achieved by supplying a program to a system or an apparatus.

[0029]

As described above, according to the present invention, it is possible to provide an information processing apparatus which modulates and transmits a plurality of data by each of the reference codes generated by the code generating means. For example, a multi-value color image When transmitting and receiving data having a large amount of information, the time required for communication can be shortened.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a spread spectrum communication system used by an information processing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a waveform of each signal of FIG.

FIG. 3 is a diagram showing an example of a spectrum of each signal of FIG.

FIG. 4 is a block diagram showing a configuration example of this embodiment.

FIG. 5 is a block diagram showing a configuration example of a transmission unit provided in the information processing apparatus according to the second embodiment of the present invention.

FIG. 6 is a diagram showing an example of waveforms of respective signals in FIG.

FIG. 7 is a block diagram illustrating a configuration example of a transmission unit included in an information processing device according to a third embodiment of the present invention.

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Claims (6)

[Claims] 1. Code generating means for generating a plurality of reference codes, modulation means for respectively modulating a plurality of data with each of the reference codes generated by the code generating means, and output from the modulating means. An information processing apparatus, comprising: a transmitting unit that transmits a plurality of signals. 2. The information processing apparatus according to claim 1, wherein the number of reference codes generated by the code generation unit matches the number of the plurality of data. 3. Dividing means for dividing each of the plurality of data in accordance with the amount of data, combining the divided data and outputting a plurality of combined data, code generating means for generating a plurality of reference codes, and the code. A modulation means for respectively modulating a plurality of combination data output from the division means by each of the reference codes generated by the generation means; and a transmission means for transmitting a plurality of signals output from the modulation means. An information processing device characterized by: 4. The information processing apparatus according to claim 3, wherein the number of reference codes generated by the code generation unit matches the number of the plurality of combination data. 5. A receiving means for receiving a required signal, a code generating means for generating a plurality of reference codes in synchronization with the required signal received by the receiving means, and a reference code generated by the code generating means. And a demodulation means for demodulating a required signal received by the reception means to obtain a plurality of data. 6. The method according to claim 1, wherein the plurality of data includes image data and control data.
The information processing apparatus according to any one of 1.