JP4658778B2 - Information processing apparatus and information processing method for data recording medium - Google Patents

Description

  The present invention relates to an information processing apparatus and information processing method for a data recording medium for recording or reproducing data recorded on a data recording medium such as paper or plastic.

  Conventionally, there are data recording media on which personal data is recorded, such as a license, a cash card, a credit card, or a passport. In data recording media, magnetic stripes, bar codes, non-contact IC chips, and the like are used for recording personal data. In some cases, personal data is recorded on a data recording medium using an image such as a facial photograph, fingerprint, or signature.

  Among these, as a technique for optically reading (reproducing) a barcode, a facial photograph, and the like, there is a technique of reading using a light receiving element such as a linear image sensor or a two-dimensional image sensor. The reading method using this light receiving element is classified by the distance from the lens to the subject, such as a reduction optical type or a contact type, or classified by a semiconductor process such as CMOS or CCD. Here, a contact type CCD image sensor is taken as an example as an apparatus for optically reproducing a barcode, a face photograph, and the like.

  In addition, as a technique for reproducing data recorded on the non-contact IC chip by wireless communication or recording data on the non-contact IC chip by wireless communication, for example, an RF band, a UHF band, a microwave band, etc. There is a method of recording or reproducing using an antenna. There are various non-contact IC chips such as a card type and a button type. Here, an RF band antenna (RF band antenna) is taken as an example of an antenna for recording or reproducing data with respect to a non-contact IC chip.

  In recent years, hybrid information processing devices that have both the function of optically reading barcodes and facial photographs and the function of recording or reproducing data on a non-contact IC chip have become widespread. (For example, refer to Patent Document 1). In this hybrid type information processing apparatus, the above-mentioned close contact type CCD image sensor and the above-mentioned RF band antenna are arranged at close positions in accordance with the recent demand for miniaturization. And, an image processing circuit that processes image data obtained by a contact-type CCD image sensor and a detection circuit that processes wireless data obtained by an RF band antenna also tend to coexist in a narrow range due to recent demands for miniaturization. It is in.

Japanese Unexamined Patent Publication No. 2004-213253 (FIGS. 1 and 3)

  However, when the close contact type CCD image sensor and image processing circuit, the RF band antenna and the detection circuit coexist in a narrow range, beat noise due to electromagnetic interaction occurs, and the image quality and the information processing apparatus as a whole There is a problem that communication quality is lowered.

  More specifically, a clock frequency for transferring image data obtained by the contact CCD image sensor to the image processing circuit is, for example, 8 MHz, and a clock signal having this clock frequency is transmitted from a 48 MHz oscillator (oscillator 1). The clock signal is divided by 1/6. On the other hand, the carrier frequency of the wireless data obtained by the RF band antenna is 13.56 MHz, for example (as defined by the ISO standard), and a carrier signal having this carrier frequency is generated from a 13.56 MHz oscillator (oscillator 2). It has been sent. Each oscillator (oscillator 1 and oscillator 2) is disposed adjacent to the same substrate.

  In such a circuit configuration, when the close contact type CCD image sensor and the image processing circuit, the RF band antenna and the detection circuit coexist in a narrow range, the clock frequency (48 MHz) and the carrier frequency (13.56 MHz) described above. Is a relatively close value (in the logarithmic order), noise due to electromagnetic waves radiated from the RF band antenna is placed on the internal wiring of the contact CCD image sensor or the image processing circuit (electromagnetic) Crosstalk). As a result, beat noise generated by the phase shift of each oscillator (oscillator 1 and oscillator 2) is generated. In addition, beat noise is also generated due to a sneak current of a power source for line-coupling the image processing circuit and the detection circuit.

  As described above, for example, when an RF communication function is additionally mounted on an existing handheld scanner, a close-contact CCD image sensor and an image processing circuit, an RF band, If the antenna and the detection circuit are arranged in a nearby space, beat noise due to electromagnetic interaction is generated, and as a result, the image quality and communication quality of the information processing apparatus as a whole are degraded.

  The present invention has been made in view of these points, and its object is to obtain image data obtained from, for example, a contact-type CCD image sensor or an RF band antenna in view of the recent demand for hybridization and miniaturization. This is an information processing device that processes different data such as wireless data using different circuits, and can prevent beat noise caused by electromagnetic interaction, resulting in degradation of image quality and communication quality. It is an object of the present invention to provide an information processing apparatus and an information processing method for a data recording medium that can prevent the above-described problem.

  In order to solve the above problems, the present invention provides the following.

(1) A data recording medium for recording or reproducing data on a data recording medium having a first recording unit for recording first data and a second recording unit for recording second data In the information processing apparatus, a first data processing unit that records or reproduces data with respect to the first recording unit, and a second data processing unit that records or reproduces data with respect to the second recording unit Are arranged close to each other, and includes an oscillating unit that drives the first data processing unit and the second data processing unit, and multiplies or divides the clock signal transmitted from the oscillating unit to thereby generate the first data. Obtaining an electrical signal that causes the processing unit to function and an electrical signal that causes the second data processing unit to function, and a phase of the electrical signal that causes the first data processing unit to function, and an electrical function that causes the second data processing unit to function The phase of the signal An information processing apparatus for a data recording medium, characterized by being synchronized.

  According to the present invention, the information processing apparatus includes a first data processing unit and a second data processing unit that perform data recording or reproduction with respect to each of the first recording unit and the second recording unit in the data recording medium. Are arranged close to each other, and the phase of the electrical signal that causes the first data processing unit to function is synchronized with the phase of the electrical signal that causes the second data processing unit to function, so that beat noise can be reduced. it can.

  That is, for example, even if electromagnetic crosstalk occurs between the first data processing unit and the second data processing unit, the phase of the electrical signal that causes each of the first data processing unit and the second data processing unit to function Since these are synchronized, stable noise (for example, periodic noise) is generated. And stable noise is easy to remove compared with unstable noise (for example, non-periodic noise). As a result, it is possible to prevent the occurrence of beat noise (for example, 'beat') caused by the phase shift of the oscillator due to electrical interaction, or to prevent the occurrence of beat noise caused by the power supply sneak around, As a result, deterioration of image quality and communication quality can be prevented.

  Here, as “first data” and “second data”, for example, data recorded in an IC memory accessible by wireless communication (RF, UHF, microwave, Bluetooth) or read by an image sensor is used. Various types of image data are available. In some cases, magnetic data read by the magnetic head may be used.

  In addition, examples of the “electrical signal that causes the first data processing unit and the second data processing unit to function” include a carrier wave in wireless communication, a transfer clock for image data, and a transfer clock for magnetic data. Any kind of electrical signal may be used as long as it is an electrical signal that allows the first recording unit and the second recording unit to perform processing necessary for recording or reproducing data.

  Further, “synchronize” means that at least the phase difference is substantially constant. For example, the phase of the electrical signal that causes the first data processing unit to function and the phase of the electrical signal that causes the second data processing unit to function may be 0, or this may be a predetermined constant, Although there are some fluctuations, it may be a periodic value. As described above, the present invention can suppress the occurrence of unstable beat noise that is difficult to be removed by the first data processing unit or the second data processing unit by setting the phase difference of these electrical signals to 0 or substantially constant. It can be done.

  In the present invention, the number of oscillators that drive the first data processing unit and the second data processing unit may be one or two, regardless of the number or type. Further, “arranged in close proximity” means that the operation of either the first data processing unit or the second data processing unit is arranged at a distance interval that somehow affects the other operation.

The information processing apparatus before Symbol data recording medium further comprises an oscillation unit for driving the first data processing unit and the second data processing unit, and an electric signal to function the first data processing unit, the second the electric signals to function data processing unit, characterized in that the electric signal obtained by multiplying or dividing the clock signal sent from the oscillating unit.

  According to the present invention, the above-described information processing apparatus is provided with the oscillation unit that drives the first data processing unit and the second data processing unit, the electrical signal that causes the first data processing unit to function, and the second data processing unit. Since the electric signal to be functioned is an electric signal obtained by multiplying or dividing the clock signal transmitted from the oscillation unit, the phase difference between the two electric signals is reduced to 0 with an easy and simple electric configuration. Or it can be made substantially constant, and by extension, the generation of unstable beat noise that is difficult to remove by the first data processing unit or the second data processing unit can be easily suppressed.

  Note that “multiplication or frequency division” includes not only multiplying the clock signal by an integer or multiplying the clock signal by (1 / integer), but also multiplying the clock signal by 1. That is, the electrical signal that causes the first data processing unit to function or the electrical signal that causes the second data processing unit to function may be the clock signal itself sent from the oscillation unit.

(2) the first data processing unit to the first recording unit composed of a memory IC, and wherein the recording or reproducing data without contact by radio communication (1) data according recorded Media information processing device.

  According to the present invention, the first data processing unit described above records or reproduces data in a non-contact manner by wireless communication with respect to the first recording unit including the memory IC. Even if noise caused by a signal (for example, a carrier wave) used when the processing unit performs wireless communication without contact is generated in the second data processing unit, it becomes stable noise and can be removed. Therefore, the reliability of data processing in the second data processing unit can be improved.

(3) The second data processing unit is an image sensor that reads and reproduces data by optical imaging with respect to the second recording unit that records image data, and includes the first data processing unit. The information processing apparatus for a data recording medium according to (2) , wherein a phase of a carrier wave to be functioned and a phase of a transfer clock to function the image sensor are synchronized.

  According to the present invention, the second data processing unit described above is an image sensor that reads and reproduces data by optical imaging with respect to the second recording unit that records image data, and the first data processing unit is Since the phase of the carrier wave to function and the phase of the transfer clock to function the image sensor are synchronized, the noise caused by the carrier wave used when the first data processing unit performs wireless communication in a non-contact manner is the second data. Even if it occurs in the processing unit (image sensor or image processing circuit), it becomes stable noise. Accordingly, stable noise can be removed by performing black correction or white correction (shading correction), for example, in the course of image processing.

(4) The information processing apparatus for the data recording medium includes a frame that forms a traveling path, a part of the frame is formed as a traveling reference plane, and the data recording medium is swiped along the traveling reference plane. The information processing apparatus for a data recording medium according to any one of (1) to (3) , wherein data recording or reproduction is performed as described above.

  According to the present invention, the information processing apparatus described above is a so-called swipe type information processing apparatus (for example, a card reader). It is possible to provide a swipe-type information processing apparatus that exhibits various effects.

  For example, in a conventional swipe type information processing apparatus, when noise generated in RF communication is placed on an image sensor or an image processing circuit, beat noise that is difficult to remove in the image processing circuit is generated, resulting in a reading error, The user must swipe the card again and retry. However, according to the present invention, even if noise generated in RF communication is on the image sensor or the image processing circuit, stable noise that is easily removed in the image processing circuit is generated, and as a result, the number of reading errors is reduced. As a result, the number of retries by the user can be reduced and the reliability of the entire information processing apparatus can be increased. Note that “swipe” refers to an operation in which the data recording medium is manually and quickly run along the conveyance path of the information processing apparatus.

(5) With respect to a data recording medium having a first recording unit for recording first data and a second recording unit for recording second data, data of the first recording unit is recorded. A first data processing unit that performs recording or reproduction, a second data processing unit that records or reproduces data with respect to the second recording unit, and drives the first data processing unit and the second data processing unit A data recording medium information processing method for recording or reproducing data using a data recording medium information processing apparatus having a first step of sending a clock signal from the oscillation unit; An electric signal for multiplying or dividing the clock signal to cause the first data processing unit to function and an electric signal for causing the second data processing unit to function, and for causing the first data processing unit to function And the phase Third step of sending 2 and a second step of synchronizing the phase of an electric signal to function data processing unit, an electrical signal obtained by said second step to said second data processing unit and the first data processing unit And an information processing method for a data recording medium.

  According to the present invention, in a data recording medium information processing method for recording or reproducing data to or from a data recording medium, a step of transmitting a clock signal from an oscillating unit, and a step of multiplying or dividing the clock signal The electric signal obtained by multiplication or frequency division is sent to a first data processing unit for recording or reproducing data to or from a first recording unit in the data recording medium, and a second recording unit in the data recording medium. The second data processing unit for recording or reproducing data and the step of sending to the second data processing unit are included, so that beat noise (for example, “beat”) caused by the phase shift of the oscillator due to electrical interaction is included. '), And beat noise caused by power wraparound can be prevented, which in turn can prevent degradation in image quality and communication quality. Kill.

  As described above, according to the present invention, it is possible to prevent the occurrence of beat noise due to electromagnetic interaction, and thus it is possible to prevent the deterioration of image quality and communication quality.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

[Appearance configuration]
FIG. 1 is a schematic diagram showing an external configuration of a swipe type information processing apparatus 1 according to an embodiment of the present invention. 1A shows a state in which the card 2 is passed through the swipe type information processing apparatus 1, and FIG. 1B shows a state in which the card 2 is enlarged as viewed from the front.

  In FIG. 1A, a swipe type information processing apparatus 1 according to an embodiment of the present invention has a frame having a substantially U-shaped cross section, and the bottom of this frame is a card travel reference plane (conveyance). Reference plane). Further, a conveyance path 1a is formed between two side plate portions facing each other with the bottom portion interposed therebetween. The electrical configuration of the swipe type information processing apparatus 1 will be described later.

  On the other hand, in FIG. 1B, the card 2 as an example of the data recording medium includes various types such as a passport, a health card, a visa card, a national card, and a bank card.

  On the surface of the card 2, a two-dimensional barcode 31 having encoded information and a face photograph 32 of the owner of the card 2 are printed. That is, image data is recorded on the surface of the card 2. Also embedded are a memory IC 33 for electronically recording various data by wireless communication, and an antenna coil 34 for transmitting and receiving information to and from the RF antenna 16 (see FIG. 2) by electromagnetic induction.

  Although not shown in FIG. 1B, the memory IC 33 and the antenna coil 34 are electrically connected by an enameled wire or the like. On the other hand, in FIG. 1B, the memory IC 33 and the antenna coil 34 embedded in the card 2 can be visually recognized, but this is for convenience of explanation. Further, although the antenna coil 34 is arranged so as to surround almost the entire area of the card 2, the present invention is not limited to this, and it may be of a size and arrangement that can communicate with the RF antenna 16.

[Mechanical and electrical configuration]
FIG. 2 is a schematic diagram showing an outline of the mechanical and electrical configuration of the swipe type information processing apparatus 1 according to the embodiment of the present invention.

  In FIG. 2, the swipe type information processing apparatus 1 includes a close contact type image sensor 11, a pad roller 12 that rotates in contact with the card 2 when the card 2 passes through the conveyance path 1 a, and rotation of the pad roller 12. And an encoder 13 for detecting the position information of the card 2. The image sensor 11 is electrically connected to an image processing unit 14 that performs various processes on the image data of the captured two-dimensional barcode 31 and face photograph 32.

  On the other hand, the swipe type information processing apparatus 1 also has an RF antenna 16 that records or reproduces data in a contactless manner by wireless communication with an antenna coil 34 embedded in the card 2. The RF antenna 16 is electrically connected to the RF communication unit 15 that reproduces data recorded in the memory IC 33 in the card 2 by wireless communication or records data in the memory IC 33 in the card 2 by wireless communication. It is connected.

  Next, the electrical configurations of the image processing unit 14 and the RF communication unit 15 will be described in detail with reference to FIG.

  FIG. 3 is a block diagram showing a detailed electrical configuration of the swipe type information processing apparatus 1 according to the embodiment of the present invention.

  In FIG. 3, the swipe type information processing apparatus 1 includes an image processing unit 14, an RF communication unit 15, a clock generation circuit 17, a communication control circuit 18, a host interface 19, and a power supply circuit 20. Yes. Note that illustration of general electric elements such as CPU, ROM, and RAM is omitted.

  The image sensor 11 is connected to the image processing unit 14 as described above, and the RF antenna 16 is connected to the RF communication unit 15 as described above. Both the image processing unit 14 and the RF communication unit 15 are connected to a host interface 19 via a communication control circuit 18, and the host interface 19 is, for example, a host device (not shown) such as a bank ATM device. It is connected to the. Further, the power supply circuit 20 of the swipe type information processing apparatus 1 supplies power to each unit based on the power sent from the host device.

  The image processing unit 14 is connected to the communication control circuit 18, an image control circuit 141 that performs integrated control of the image processing unit 14, and an image that performs various processes on the image data sent from the image sensor 11. A processing circuit 142 and a sensor clock generation circuit 143 that generates a sensor clock necessary for driving the image sensor 11 are provided.

  On the other hand, the RF communication unit 15 is connected to the communication control circuit 18, an RF control circuit 151 that performs integrated control of the RF communication unit 15, and an RF oscillation that transmits a predetermined signal on a carrier wave to the RF antenna 16. A circuit 152 and an RF detection circuit 153 that extracts a predetermined signal from the data transmitted from the RF antenna 16 (detects the signal by removing the carrier wave) are included.

  Here, an electrical signal that causes the image processing unit 14 including the image control circuit 141, the image processing circuit 142, and the sensor clock generation circuit 143 to function, and the RF control circuit 151, the RF oscillation circuit 152, and the RF detection circuit 153 are used. An electrical signal that causes the configured RF communication unit 15 to function is transmitted from the clock generation circuit 17. That is, the clock generation circuit 17 has a function of driving the image processing unit 14 and the RF communication unit 15. As the clock generation circuit 17 having such a function, for example, the frequency dividing circuit shown in FIG. 4 or the frequency multiplication circuit shown in FIG. 5 can be cited as an example.

  FIG. 4 is a diagram illustrating an example of an electrical configuration of the clock generation circuit 17 having a frequency dividing function. FIG. 5 is a diagram illustrating an example of an electrical configuration of the clock generation circuit 17 ′ having a frequency multiplication function.

  First, in FIG. 4A, a clock generation circuit 17 having a frequency dividing function includes a 1/3 frequency divider 170a for increasing the frequency of the input signal by 1/3, and a frequency of the input signal by 1/2. ½ frequency divider 170b and an oscillation circuit 171 for generating a reference clock signal (reference signal).

  In FIG. 4A, the 1/3 frequency divider 170a increases the frequency of the reference signal (see the waveform (X) in FIG. 4B) input from the oscillation circuit 171 and outputs it. It has a function (see the waveform (Y) in FIG. 4B). The 1/2 divider 170b has a function of outputting the reference signal (see the waveform (X) in FIG. 4B) input from the oscillation circuit 171 by a factor of 1/2. (Refer to the waveform (Z) in FIG. 4B). Specific examples of the 1/3 frequency divider 170a and the 1/2 frequency divider 170b include a D flip-flop, an RS flip-flop, a JK flip-flop, and a JKFF flip-flop.

  As described above, in the clock generation circuit 17, a signal having a frequency 1/3 times that of the reference signal and synchronized with the reference signal (a signal having the waveform (Y) in FIG. 4B), and the reference signal And a signal synchronized with the reference signal (a signal having the waveform (Z) in FIG. 4B) can be extracted. The former is supplied to each of the image control circuit 141, the image processing circuit 142, and the sensor clock generation circuit 143 (see FIG. 3), and the latter includes the RF control circuit 151, the RF oscillation circuit 152, and It is supplied to each of the RF detection circuits 153 (see FIG. 3). As a specific numerical value, for example, when the frequency of the reference signal transmitted from the oscillation circuit 171 (the frequency of the signal (X) in FIG. 4B) is 27.12 MHz, it is supplied to the image processing unit 14. The frequency of the electrical signal (the frequency of the signal (Y) in FIG. 4B) is 9.04 MHz (about 8 MHz), and the frequency of the electrical signal supplied to the RF communication unit 15 (in FIG. 4B ( The frequency of the signal Z) is 13.56 MHz. Next, the clock generation circuit 17 ′ having the frequency multiplication function shown in FIG.

  In FIG. 5A, a clock generation circuit 17 ′ having a frequency multiplication function compares the phase difference between two input signals with an oscillation circuit 171 that generates a reference clock signal (reference signal). Phase comparators 172a and 172b that generate difference signals, loop filters 173a and 173b that cut AC components, and a constant free-running frequency, and the oscillation frequency can be changed by applying a voltage to the control terminal. Possible voltage controlled oscillators (VCO) 174a, 174b, 1/2 divider 170a for halving the frequency of the input signal, and 1/3 divider for doubling the frequency of the input signal 170b.

  5A, first, the phase comparator 172a is based on a reference signal (for example, a signal having the waveform (X) in FIG. 5B) input from the oscillation circuit 171 and the free-running oscillation of the VCO 174a. After phase comparison with the generated comparison signal, the phase difference component is output as a pulsed phase difference signal. The loop filter (LPF or the like) 173a cuts off the high frequency component of the phase difference signal. Then, the VCO 174a adjusts the oscillation frequency based on the phase difference signal from which the high frequency component is blocked, and feeds back a signal having a constant free-running frequency to the phase comparator 172a. If the phase of the signal output from the VCO 174a is ahead of the reference signal, the oscillation frequency of the VCO 174a is lowered (the phase is delayed), and if the phase of the signal output from the VCO 174a is behind the reference signal, The oscillation frequency of the VCO 174a is increased (the phase is advanced).

  Here, when a signal having a constant free-running frequency is fed back from the VCO 174a to the phase comparator 172a, it is configured to pass through the 1/2 frequency divider 170a. Therefore, a signal having a frequency that is 1/2 of the signal output from the VCO 174a is input to the phase comparator 172a as a comparison signal. As a result, the output of the VCO 174a has a frequency twice that of the reference signal. And a signal synchronized with the reference signal (a signal having a waveform (Y) in FIG. 5B) can be extracted.

  This clock signal (the signal having the waveform (Y) in FIG. 5B) is supplied to each of the image control circuit 141, the image processing circuit 142, and the sensor clock generation circuit 143 (see FIG. 3). ). On the other hand, in FIG. 5A, in the feedback loop constituted by the phase comparator 172b, the loop filter 173b, the VCO 174b, and the 1/3 frequency divider 170b, the reference signal 3 is output as the output of the VCO 170b in the same manner as described above. A signal having a double frequency and synchronized with the reference signal (a signal having the waveform (Z) in FIG. 5B) can be extracted. The clock signal is supplied to each of the RF control circuit 151, the RF oscillation circuit 152, and the RF detection circuit 153 (see FIG. 3). As a specific numerical value, for example, when the frequency of the reference signal transmitted from the oscillation circuit 171 (the frequency of the signal (X) in FIG. 5B) is 4.52 MHz, it is supplied to the image processing unit 14. The frequency of the electrical signal (the frequency of the signal (Y) in FIG. 5B) is 9.04 MHz (about 8 MHz), and the frequency of the electrical signal supplied to the RF communication unit 15 (in FIG. 5B ( The frequency of the signal Z) is 13.56 MHz.

  As described above, according to the clock generation circuit 17 or the clock generation circuit 17 ′ illustrated in FIGS. 4A and 5A, the clock generation circuit 17 ′ is transmitted from the oscillation circuit 171 that functions as an example of the “oscillation unit”. The clock signal can be divided (see FIG. 4 (b)) or multiplied (see FIG. 5 (b)), and the electric signals obtained thereby are converted into the image processing unit 14 or the RF communication unit 15. Can be given to.

  As specific examples of the phase comparators 172a and 172b, for example, an exclusive OR gate application type phase comparator, an RS flip-flop application type phase comparator, a positive edge trigger type phase comparator, and the like can be used. As specific examples of the loop filters 173a and 173b, for example, lag type LPFs, lag lead type LPFs and the like can be used, and as specific examples of the VCOs 174a and 174b, for example, a crystal oscillator (VCXO) and the like can be used.

[Information processing]
FIG. 6 is a flowchart showing the operation (information processing flow) of the swipe type information processing apparatus 1 according to the embodiment of the present invention. Here, the clock generation circuit 17 (see FIG. 4) is used.

  In FIG. 6, when the card 2 is swiped (step S1), a reference signal is sent from the clock generation circuit 17 (step S2). More specifically, when the CPU (not shown) of the swipe type information processing apparatus 1 detects that the card 2 has entered the transport path 1a by, for example, an optical sensor, the oscillation circuit 171 of the clock generation circuit 17 is used. To generate a reference signal (frequency 27.12 MHz). Then, a reference signal is generated in the oscillation circuit 171 (see FIG. 4) of the clock generation circuit 17, and this reference signal is sent to the 1/3 frequency divider 170a and the 1/2 frequency divider 170a.

  Next, the reference signal is divided (step S3). More specifically, as described with reference to FIG. 4, when the reference signal (frequency 27.12 MHz) generated by the oscillation circuit 171 passes through the 1/3 frequency divider 170a, the frequency is 1 / A triple electric signal (frequency: 9.04 MHz) is supplied to each of the image control circuit 141, the image processing circuit 142, and the sensor clock generation circuit 143. Further, when passing through the 1/2 frequency divider 170b, the frequency becomes an electric signal (frequency 13.56 MHz) that is ½ times, and the RF control circuit 151, the RF oscillation circuit 152, and the RF detection circuit 153 Supplied to each.

  Then, data recording or reproduction is performed (step S4). More specifically, first, the sensor clock generation circuit 143 generates a sensor clock for driving the image sensor (imaging device) 11 using the electrical signal supplied in step S <b> 3, and supplies this to the image sensor 11. . Then, the image sensor 11 images the two-dimensional barcode 31 and the face photograph 32 (see FIG. 1B) of the card 2 passing through the transport path 1a by photoelectric conversion. The image processing circuit of the image processing unit 14 performs signal processing such as position detection processing, structure analysis processing, and decoding processing using the electrical signal (image data transfer clock) supplied in step S3. Thereby, the reproduction of optical data is completed.

  On the other hand, the RF oscillation circuit 152 puts a predetermined signal on a carrier wave using the electric signal supplied in step S3 and sends it to the RF antenna 16. Thereby, data can be recorded in the memory IC 33 of the card 2 via the RF antenna 16. Further, the RF detection circuit 153 extracts a predetermined signal from the data transmitted from the RF antenna 16 using the electrical signal supplied in step S3. Thereby, the data recorded on the card 2 can be reproduced.

  Here, in the process of step S4, the phase of the electric signal used in the image processing unit 14 and the phase of the electric signal used in the RF communication unit 15 are synchronized. Therefore, even if electromagnetic crosstalk occurs between the image processing unit 14 and the RF communication unit 15 (RF antenna 16), stable noise (for example, periodic noise) is generated.

  For example, when unstable noise (for example, non-periodic noise) is generated in the image processing unit 14, as shown in FIG. 7A, the image data has a waved waveform (that is, beat noise). Out). However, when stable noise (for example, periodic noise) is generated in the image processing unit 14, as shown in FIG. 7B, the DC component of the image data drifts by a certain value e. Waveform (ie no beat noise). Accordingly, stable noise as shown in FIG. 7B can be removed by performing black correction or white correction (shading correction), so that deterioration in image quality can be prevented.

  Moreover, the swipe type information processing apparatus 1 according to the present embodiment can also prevent a decrease in communication quality. More specifically, it is conceivable that the crosstalk noise wraps around the RF oscillation circuit 152 and the RF detection circuit 153 via a power supply line when power is supplied from the power supply circuit 20 (see FIG. 3) to each unit. However, since the modulation / demodulation in the RF oscillation circuit 152 and the RF detection circuit 153 is based on phase modulation or amplitude modulation, if the above-described stable noise (for example, periodic noise) is generated, its adverse effect is caused. Can be minimized. Accordingly, it is possible to prevent a decrease in communication quality.

  As described above, according to the swipe type information processing apparatus 1 according to the present embodiment, it is possible to prevent the occurrence of beat noise due to electromagnetic interaction, and thus prevent deterioration in image quality and communication quality. be able to.

  In the present embodiment, the reference signal generated by the oscillation circuit 171 when generating the electrical signal supplied to each of the image control circuit 141, the image processing circuit 142, and the sensor clock generation circuit 143 in the clock generation circuit 17. Although an electrical signal (frequency 9.04 MHz) having a frequency 1/3 times is generated from the signal (frequency 27.12 MHz), the present invention is not limited to this. For example, from the reference signal (frequency 27.12 MHz) generated by the oscillation circuit 171, an electric signal (frequency 0.1059375 MHz) having a frequency 1/256 times is generated. Then, a PLL oscillation circuit is prepared for the transfer clock of the image sensor 11 (see, for example, FIG. 5), and an electric signal having a frequency of 0.1059375 MHz is multiplied (using a 1/76 divider). An electric signal of 05125 may be generated. As a result, it is possible to prevent the occurrence of beat noise due to electromagnetic interaction as described above, and to prevent deterioration in image quality.

  Further, for example, as shown in FIG. 8, it is possible to employ a clock generation circuit 17 ″ including an oscillation circuit (OSC) 171, a ¼ frequency divider 170c, and a PLL 200. More specifically, the reference signal (frequency 32 MHz) generated by the oscillation circuit 171 becomes an 8 MHz electrical signal via the ¼ frequency divider 170 c and is sent to the image processing unit 14. On the other hand, the 8 MHz electrical signal is multiplied to a 13.56 MHz electrical signal via the PLL 200 and sent to the RF communication unit 15. In this manner, the electrical signal (8 MHz) used in the image processing unit 14 and the electrical signal (13.56 MHz) used in the RF communication unit 15 can be synchronized.

  In this embodiment, the card 2 is considered as a data recording medium. However, the present invention is not limited to this and can be applied to other media. Further, in the present embodiment, the contact type is considered as the image sensor 11, but other reduction optical types and the like can be considered. In the present embodiment, the swipe type is considered as the information processing apparatus 1, but application to a scanning method such as a flat bed type or a two-dimensional sensor is also possible. In addition, the present invention is applied to a system in which an image sensor in general and a wireless communication circuit coexist, or to a system in which communication using electromagnetic coupling such as a non-contact IC and a display driven at high frequency such as a liquid crystal display or a CRT coexist. Application is also possible.

  The information processing apparatus and the information processing method for a data recording medium according to the present invention can prevent the occurrence of beat noise caused by electromagnetic interaction, and thus can prevent degradation of image quality and communication quality. Useful as a thing.

It is a schematic diagram which shows the external appearance structure of the swipe type information processing apparatus which concerns on embodiment of this invention. It is a mimetic diagram showing an outline of mechanical and electrical composition of a swipe type information processor concerning an embodiment of the invention. It is a block diagram which shows the detailed electrical structure of the swipe type information processing apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the electrical constitution of the clock generation circuit which has a frequency division function. It is a figure which shows an example of the electrical constitution of the clock generation circuit which has a frequency multiplication function. It is a flowchart which shows operation | movement (flow of information processing) of the swipe type information processing apparatus which concerns on embodiment of this invention. It is a wave form diagram which shows a mode that beat noise got on. It is a figure which shows an example of the electrical constitution of a clock generation circuit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Swipe type information processing apparatus 1a Carriage path 2 Card 11 Image sensor 12 Pad roller 13 Encoder 14 Image processing part 15 RF communication part 16 RF antenna 17 Clock generation circuit 18 Communication control circuit 19 Host interface 20 Power supply circuit 31 Two-dimensional barcode 32 Photo 33 Memory IC
34 Antenna coil

Claims (5)

Information processing apparatus for data recording medium for recording or reproducing data to / from a data recording medium having a first recording unit for recording first data and a second recording unit for recording second data In
A first data processing unit for recording or reproducing data with respect to the first recording unit and a second data processing unit for recording or reproducing data with respect to the second recording unit are arranged close to each other. As
An oscillation unit for driving the first data processing unit and the second data processing unit;
An electrical signal that causes the first data processing unit to function by multiplying or dividing the clock signal transmitted from the oscillation unit, and an electrical signal that causes the second data processing unit to function, and the first data processing An information processing apparatus for a data recording medium, wherein the phase of an electrical signal that causes a unit to function and the phase of an electrical signal that causes the second data processing unit to function are synchronized. The first data processing unit to the first recording unit composed of a memory IC, data recording medium according to claim 1, wherein the recording or reproducing data without contact by radio communication information Processing equipment. The second data processing unit is an image sensor that reads and reproduces data by optical imaging with respect to the second recording unit that records image data,
3. The information processing apparatus for a data recording medium according to claim 2 , wherein a phase of a carrier wave that causes the first data processing unit to function and a phase of a transfer clock that causes the image sensor to function are synchronized. The information processing apparatus for the data recording medium has a frame that forms a travel path, a part of the frame is formed as a travel reference plane, and data is recorded by swiping the data recording medium along the travel reference plane. the information processing apparatus of the data recording medium according to any of claims 1, wherein the performing of the recording or reproduction 3. For a data recording medium having a first recording unit for recording first data and a second recording unit for recording second data,
A first data processing unit for recording or reproducing data with respect to the first recording unit;
A second data processing unit for recording or reproducing data with respect to the second recording unit;
An information processing method for a data recording medium that records or reproduces data using an information processing apparatus for a data recording medium having an oscillation unit that drives the first data processing unit and the second data processing unit. ,
A first step of sending a clock signal from the oscillator;
An electric signal for multiplying or dividing the clock signal to cause the first data processing unit to function and an electric signal for causing the second data processing unit to function, and for causing the first data processing unit to function And a second step of synchronizing the phase of the electrical signal that causes the second data processing unit to function , and
An information processing method for a data recording medium, comprising: a third step of sending the electrical signal obtained in the second step to the first data processing unit and the second data processing unit.

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