JP2000184006A - Data processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily discriminate an operation state. SOLUTION: A USB camera 10 contains a USB connector 28 and the USB camera 10 is connected to PC 32 with USB 30 connected to the USB connector 28. When the USB camera 10 is connected to PC 32, an address is informed to IC 22 as initialization from PC 32. Then, the transfer request of picture data is given to IC 22 from PC 32. When a transmission request is given, IC 22 transfers a picture file recorded in a flash memory 24 at an operating band width (transfer rate) indicated by PC 32. IC 22 gives voltage corresponding to use band width to LED 36. LED 36 turns on light or flickers it in accordance with voltage from IC 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing device, and more particularly to a data processing device connected to a host by, for example, a universal serial bus.

[0002]

2. Description of the Related Art Universal serial bus (hereinafter referred to as "U")
SB ". ) Is keyboard, mouse, speaker,
This interface unifies the connection between a modem (serial port) and a printer (parallel port). By using such a USB, a personal computer (P
The data processing device (function) can be connected to the PC while the power supply of C) is turned on (hot plug function). In addition, a maximum of 127 data processing devices can be connected in a star configuration using a hub, mainly a PC as a host. Further, after the connection of the data processing devices, the data transfer can be performed in parallel by changing the data transfer speed (bandwidth used) of each data processing device. Some data processing devices can change the transfer speed.

[0003]

However, the conventional data processing apparatus cannot determine the current data transfer rate from the appearance. For this reason, in a case where one of the data processing devices connected to the host starts up the other data processing device while occupying the entire used bandwidth,
The other data processing device cannot perform data transfer, and it is difficult to determine the cause. Such a problem has been prominent when one of the data processing devices is a device capable of changing the transfer speed.

[0004] Therefore, a main object of the present invention is to provide a data processing device capable of easily determining an operation state.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a data processing apparatus connected to a host using an interface having a predetermined data bandwidth and capable of changing a used bandwidth used in the data bandwidth. A data processing apparatus comprising: a bandwidth setting unit configured to set a used bandwidth in accordance with the instruction of (1), and an output unit configured to output information on the set used bandwidth.

[0006]

The data processing device can be connected to the host using an interface. The interface is
It has a predetermined data bandwidth and can change the used bandwidth used in the data bandwidth. The bandwidth setting means sets a used bandwidth according to the instruction of the host. The output means outputs information on the set used bandwidth.

In one aspect of the present invention, the output means includes a visible display means. In one embodiment of the present invention, the visible display means includes one light emitting element, and the light emitting element blinks at a period determined by the size of the used bandwidth.

[0008]

According to the present invention, since information corresponding to the used bandwidth is output, the operation state can be easily determined. The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0009]

Referring to FIG. 1, a USB (Universal Serial Bus) camera 10 of this embodiment includes a lens 12, and a light image incident from the lens 12 is converted into an electric signal by a CCD imager 14. The CCD imager 14 has, for example, a color filter of a primary color Bayer array and outputs an electric signal (progressive scan signal) for each pixel according to progressive scan (pixel sequential scan).

[0010] The progressive scan signal from the CCD imager 14 is supplied to a video signal processing circuit 16. The video signal processing circuit 16 includes a CCD imager 14
The well-known noise reduction and level adjustment are applied to the progressive scan signal from
The conversion is performed, and the data is converted into digital data. Then, well-known white balance adjustment and gamma correction are performed on the digital data (image data) of the progressive scan signal.

When a shutter button (not shown) is pressed by an operator, when the CCD imager 14 outputs a progressive scan signal for one frame,
Disable the CCD imager 14. Accordingly, one frame of photographed image data is output from the video signal processing circuit 16, and the photographed image data is
It is stored in the memory area 20a of the RAM 20. In addition,
When the shooting mode is set to continuous shooting mode, CC
The progressive scan signals are output from the D imager 14 at predetermined intervals (after 60 frames), and are sequentially stored in the DRAM 20 via the video processing circuit 16 and the internal bus 18.

The IC 22 uses the work area 20b to store the Y, U and V
Data, that is, photographed image data, is compressed according to the JPEG format, and an image file containing the compressed data is created. Then, the image file is recorded in the flash memory 24. The IC 22 is also connected to a USB connector 28 via an internal bus 26. USB connector 2
8 is connected via a USB 30 to a personal computer (PC) 32 as a host. Therefore, U
Communication can be performed between the SB camera 10 and the PC 32. The USB 30 is a 4-core bus, and has two signal lines and two
Power lines. That is, the USB connector 28 connects the signal line (the internal bus 26) to the IC 22 and connects the power supply line to the power supply circuit 34. The power supply circuit 34 supplies power to the IC 22 and also supplies power to other circuits. Further, the USB 30 has a predetermined data bandwidth, and can change a used bandwidth used for data transfer within the data bandwidth. Note that the USB camera 10 is detached from the PC 32 when performing normal shooting, and is connected to the PC 32 when transferring image data (image file).

Further, the IC 22 is connected to the LED 36, and the LED 36 is provided on the outer surface of the USB camera 10. The LED 36 blinks at a duty ratio according to the bandwidth used for transferring the image file from the USB camera 10 to the PC 32 according to the instruction of the IC 22. When the USB camera 10 as a multimedia USB device is connected to the PC 32, the high-speed mode is selected for the data bandwidth. In high-speed mode, the image file is 12Mbps
Is transferred to the PC 32 with a data bandwidth up to. When a low-end device such as a USB keyboard or a mouse is connected, the low-speed mode is selected, and data is transferred with a data bandwidth having an upper limit of 1.5 Mbps. When the USB camera 10 is connected to the PC 32, the IC 22 is notified as an initial setting that there are, for example, 16 types of transfer methods for a data bandwidth of 12 Mbps. In addition, an address used for communication with the USB camera 10 on the PC 32 side is also notified. When the image capturing application has been started on the PC 32 side, a transmission request signal is given to the IC 22. If there is a transmission request, the IC 22 transfers the image file recorded in the flash memory 24 with the used bandwidth specified by the PC 32 according to the instruction of the operator.

Once the bandwidth to be used is determined, PC3
Unless the used bandwidth set by the operator in step 2 is changed, the used bandwidth remains fixed even if the available bandwidth increases or decreases. In the image capturing application, when the operator changes the used bandwidth, the PC 32 gives an instruction to the IC 22 to change the used bandwidth. That is, the used bandwidth changed when indicating the used bandwidth is indicated. Therefore, the IC 22 changes the used bandwidth and transfers the image file with the changed used bandwidth.

The bandwidth used for transferring the image file from the IC 22 to the PC 32 is displayed by the LED 36 in three types. That is, as shown in FIG. 2A, when the used bandwidth is 7 Mbps to 12 Mbps, the IC
22 always outputs a high-level (5 V) voltage.
The ED 36 is always turned on. Use bandwidth is 3-7Mbp
In the case of s, as shown in FIG. 2B, a voltage at which the duty of the high level is almost equal to the duty of the low level (0 V) is applied to the LED 36, and the LED 36 blinks. When the used bandwidth is 3 Mbps or less, as shown in FIG. 2C, the duty of the low level is made larger than that of the high level. That is, the lighting time of the LED 36 is shorter than in the case where the used bandwidth is 3 to 7 Mbps. Thus, by turning on or off the LED 36,
You can easily know the bandwidth used. In this embodiment, one LED blinks in accordance with the used bandwidth. However, a plurality of LEDs may be used to change the number of LEDs to be turned on in accordance with the used bandwidth.

The above-described operation is performed by the IC 22 according to the flowchart shown in FIG. USB camera 10 is PC
When the power is supplied to the IC 22, the process starts, and the USB 30 is initialized in step S 1.
That is, the PC 32 notifies that there are 16 types of data transfer methods, addresses to be used, and the like. In a succeeding step S3, it is determined whether or not there is a transmission request. That is, it is determined whether or not the image capturing application has been started on the PC 32 side. If "NO" here, the process returns to the step S3. However, if "YES", the used bandwidth specified by the PC 32 is determined in a step S5. In a succeeding step S7, a voltage corresponding to the determined used bandwidth is output to the LED 36, and the used bandwidth is displayed. In step S9, the image file recorded in the flash memory 24 is transferred in accordance with the instruction of the operator. In step S11, it is determined whether or not there is a request to end the transfer of the image file. If “NO” in the step S11, the process returns to the step S9, but if “YES”, the process is ended.

According to this embodiment, the used bandwidth is
Since the display is made at 36, the operating state can be easily known. Therefore, it is easy to determine whether or not connection with another peripheral device (data processing device) is possible. In this embodiment, the case where the image file is transferred is described. However, in the suspend mode, which is the power save mode of the USB camera 10, the LED 36 is always set to the low level (0).
The voltage V) is output from the IC 22 and the LED 36 is turned off.

In this embodiment, a USB camera is described as a data processing device. However, it goes without saying that the present invention can be applied to any peripheral device as long as the device can be connected via USB. Further, in this embodiment, the used bandwidth is displayed by lighting and blinking the LED. However, for example, a buzzer may be used to notify by sound. In addition, although the three types are displayed, they may be displayed more finely.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention;

FIG. 2 shows an LE corresponding to a used bandwidth in the embodiment of FIG.
6 is a timing chart showing an output voltage to D.

FIG. 3 is a flowchart showing a part of the processing of the IC shown in FIG. 1 embodiment;

[Explanation of symbols]

 10 ... USB camera 22 ... IC 30 ... USB 36 ... LED

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/781 H04N 5/781 510J 5/907

Claims (3)

[Claims] 1. A data processing apparatus connected to a host using an interface having a predetermined data bandwidth and capable of changing a used bandwidth used in the data bandwidth, wherein the used bandwidth is changed according to an instruction of the host. A data processing apparatus comprising: a bandwidth setting unit for setting; and an output unit for outputting information on the set used bandwidth. 2. The data processing apparatus according to claim 1, wherein said output means includes a visual display means. 3. The data processing apparatus according to claim 2, wherein said visible display means includes one light emitting element which blinks at a period determined by the size of said used bandwidth.