JP2004112570A - Digital broadcast receiver and video display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of signals connected through a cable by converting the signals into serial bus signals in a configuration that a digital board with a CPU mounted thereon and a memory card board are located in distant places and connected with each other via the cable like a digital broadcast receiver. <P>SOLUTION: The digital broadcast receiver is equipped with: a digital broadcast signal processing part; a first serial communication interface part provided on the side of the digital broadcast signal processing part; a storage medium data processing part for extracting data stored on a storage medium connected from the outside; a second serial communication interface part provided on the side of the storage medium data processing part; and a serial communication means for connecting the first serial communication interface part and the second serial communication interface part by serial communications. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a digital broadcast receiving apparatus, and more particularly, to a digital broadcast receiving apparatus to which a removable storage medium is externally connected.
[0002]
[Prior art]
In recent years, a memory card has been used as a removable storage medium connected to a device having a recording or reproducing function. A memory card is a card-shaped recording medium incorporating a nonvolatile memory called a flash memory.
[0003]
These memory cards have a plurality of forms such as SSFDC (Smartmedia (registered trademark)), compact flash (registered trademark), SD memory card (registered trademark), and memory stick (registered trademark), and each has its own standard. .
[0004]
These memory cards are widely used in digital still cameras, portable music players, and the like.
[0005]
On the other hand, BS digital broadcasting using broadcasting satellites was started in December 2000. Accompanying this, a receiving device for receiving BS digital broadcasting has been commercialized.
[0006]
Some of the BS digital broadcast receivers include a slot (memory card slot) in which the memory card is inserted.
[0007]
By attaching a memory card photographed by a digital still camera to the memory card slot, an image photographed by the digital camera is used for displaying on a television screen.
[0008]
The memory card slot is generally provided on the front face of the digital broadcast receiving device because of the operational relationship of a user inserting and removing a memory card. Along with this, a data processing unit for extracting data stored in the memory card is also arranged near the memory card.
[0009]
On the other hand, a main circuit board that constitutes a digital circuit for converting a digital broadcast signal received in the digital broadcast receiving apparatus into a video signal receives an external antenna input, and further directly transmits a high-speed digital signal directly to the back of the digital broadcast receiving apparatus. In order to arrange terminals, the terminals are generally arranged on the back of the digital broadcast receiving apparatus main body.
[0010]
Then, a memory card board (card board) on which the memory card is mounted and for extracting data stored in the memory card and a main board for converting digital broadcast signals into video signals are connected using a connection cable. I was
[0011]
A high-speed digital signal processing circuit is formed on the main board (that is, a digital circuit board). Therefore, the digital circuit board (main board) is generally shielded with a metal plate for spurious measures (measures to suppress noise emission to other circuits and boards that perform analog signal processing). is there.
[0012]
However, in the digital broadcast receiving apparatus, as described above, it is necessary to insert a filter (EMI filter) for removing noise into a signal output from the memory card board as a part of the measure against spuriousness of the main board. For this reason, there is a problem that the cost is increased. Further, there is a problem that a residual noise component that cannot be completely removed by the filter causes an interference wave to other analog signal processing circuits, and deteriorates other analog signal processing performance.
[0013]
Conventionally, as a document describing a clock frequency transmission system for reducing EMI noise, JP-A-2000-166844 is disclosed.
[0014]
In the above document, the transmission waveform transmitted between the functional block circuits contains almost no harmonic components by transmitting a clock frequency signal containing only the fundamental frequency and containing no or a small number of harmonic components from the oscillation circuit. It is disclosed that EMI noise can be reduced as much as possible.
[0015]
However, in a digital broadcast receiving apparatus, a signal transmitted from a digital circuit board (main board) that processes a digital signal is converted into a small number of signals and transmitted to a memory card, and data read from the memory card is also converted. Is not disclosed to be converted to a small number of signals and transmitted to a digital circuit board, and it has not been sufficient from a practical point of view.
[0016]
[Problems to be solved by the invention]
As described above, in a conventional digital broadcast receiving apparatus, a signal transmitted from a digital circuit board (main board) for processing a digital signal is converted into a small number of signals and transmitted to a memory card. It is not disclosed that the read data is converted into a small number of signals and transmitted to a digital circuit board, and an invention in a practical sense has been desired.
[0017]
[Means for Solving the Problems]
A digital broadcast receiving apparatus according to the present invention includes: a digital broadcast signal processing unit that converts a received digital broadcast signal into a video signal; and a digital broadcast signal processing unit that is provided on the digital broadcast signal processing unit side, and is configured to be parallel when a serial signal is input. The first serial communication interface unit that converts the signal into a signal and outputs the signal, and converts the signal into a serial signal when a parallel signal is input, and the digital broadcast signal processing unit is provided apart from the first serial communication interface unit and connected from the outside. A storage medium data processing unit for extracting data stored in a storage medium to be processed, and a storage medium data processing unit provided on the storage medium data processing unit side. A second serial communication interface for converting a signal into a serial signal when the signal is input and outputting the serial signal; Connecting the second serial communications interface with the interface unit with the serial communication is configured with a serial communication means.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
FIG. 1 is a schematic view of a digital broadcast receiving apparatus according to an embodiment of the present invention.
[0020]
Reference numeral 30 denotes a digital broadcast receiving device main body, which is combined with a display device. Reference numeral 11 denotes a memory card. As described above, the memory card 11 is a card-shaped recording medium incorporating a nonvolatile memory called a flash memory. Reference numeral 31 denotes a slot (memory card slot) in which the memory card 11 is mounted.
[0021]
When the memory card 11 is externally connected to (inserted into) the memory card slot 31, data recorded on the memory card is read, the processing described later is performed, and the data is displayed on the display unit of the digital broadcast receiving apparatus. Further, the data processed in the digital broadcast receiving device 30 can be recorded on the memory card 11.
As the memory card 11, for example, SSFDC (Smartmedia (registered trademark)), Compact Flash (registered trademark), SD memory card (registered trademark), and Memory Stick (registered trademark) can be used.
[0022]
For example, by mounting the memory card 11 photographed by a digital still camera or the like in the memory card slot 11, data such as images stored in the memory card can be displayed on the display screen.
[0023]
The memory card slot 31 is provided at the front of the digital broadcast receiving apparatus, or on the top or side of the digital broadcast receiving apparatus, in a position where the user can easily insert and remove the memory card 11 from the operational relationship (user convenience) for the user to insert and remove the memory card 11.
[0024]
FIG. 2 is a schematic view showing a state of connection between a main board and a memory card board of the digital broadcast receiving apparatus according to the embodiment of the present invention.
[0025]
Reference numeral 40 denotes a main board. The main board 40 includes a digital circuit that receives an external antenna input (digital broadcast receiving unit: not shown) and converts a received high-speed digital broadcast signal into a video signal. The antenna input terminal is arranged on the back side of the digital broadcast receiving device main body. It is desirable that the main board 40 is arranged near the antenna input terminal. For this reason, the main board 40 is arranged on the back side of the digital broadcast receiving device main body.
[0026]
Reference numeral 50 denotes a memory card substrate. Reference numeral 10 denotes a memory card holder to which a memory card 11 is connected. The memory card board 50 extracts data stored from the memory card 11 connected to the memory card holder 10. Further, the data is stored in the memory card 11.
[0027]
As described above, the memory card holder 10 is provided at a position where the user can easily put in and take out the digital broadcast receiving device 30, such as the front surface, the top surface, and the side surface, in consideration of the user's convenience. For this reason, the memory card substrate 50 is disposed in the digital broadcast receiving apparatus 30 near the front surface, the upper surface, or the side surface of the digital broadcast receiving device 30 where the user can easily put in and out.
[0028]
As described above, the main board 40 is arranged on the back side of the digital broadcast receiving apparatus 30 main body, and the memory card board 50 is arranged on the front face, the upper face, the side face, and the like in the digital broadcast receiving apparatus 30. Therefore, the main board 40 and the memory card board 50 are separated from each other.
[0029]
Reference numeral 6 denotes a cable. The main board 40 and the memory card board 50 separated from each other are connected by the cable 6.
[0030]
FIG. 3 is a block diagram showing a configuration of the digital broadcast receiving apparatus according to the embodiment of the present invention.
[0031]
First, the main board 40 will be described.
[0032]
Reference numeral 1 denotes a CPU (Central micro processor), reference numeral 2 denotes a program memory, reference numeral 3 denotes a working memory, reference numeral 5 denotes a serial communication interface, and reference numeral 4 denotes communication between the CPU 1, the program memory 2, the working memory 3, and the serial communication interface 5. This is a communication bus for parallel communication connection. Reference numeral 40 denotes a main board constituting these components.
[0033]
The main board 40 is arranged on the back side of the main body of the digital broadcast receiving device 30 as described above.
[0034]
The CPU 1, the program memory 2, and the working memory 3 are connected via the communication bus 4. Digital broadcast receiving means (not shown) is connected to the communication bus 4. The digital broadcast received by the digital broadcast receiving means is controlled by the CPU 1 that performs overall control according to a program recorded in the program memory 2, and is converted into a video signal using the work memory 3 as appropriate.
[0035]
Further, as described above, the serial communication interface 5 is connected to the CPU 1, the program memory 2, and the working memory 3 via the communication bus 4. Similarly, the data output from the serial communication interface 5 is also controlled by the CPU 1 that performs overall control according to the program recorded in the program memory 2, and is converted into a video signal using the work memory 3 as appropriate.
[0036]
The serial communication interface 5 converts an input serial signal into a parallel signal, or converts an input parallel signal into a serial signal and outputs it. Data input from the communication bus 4 to the serial communication interface 5 is a parallel signal, which is converted into a serial signal and output to the outside of the main board 40. When a serial signal is input to the serial communication interface 5 from the outside of the main board 40, it is converted into a parallel signal and output to the outside of the main board 40.
Next, the memory card substrate 50 will be described.
[0037]
Reference numeral 11 denotes a memory card. Reference numeral 10 denotes a memory card holder to which a memory card is externally connected. Reference numeral 8 denotes a memory card controller, which is electrically connected to the memory card holder 10 via the connection means 9. The memory card controller 8 extracts data stored in the memory card 11 connected to the memory card holder 10. Conversely, the data supplied to the memory card controller 8 is stored in the memory card 11.
[0038]
Reference numeral 7 denotes a serial communication interface. The serial communication interface is electrically connected to the memory card controller 8 via the connection means 12.
[0039]
The memory card substrate 50 constitutes the memory card holder 10, the memory card controller 8, the connection means 9, the serial communication interface 7, and the connection means 12, and is connected by parallel communication.
[0040]
The memory card substrate 50 is disposed on the front surface, the upper surface, the side surface, and the like in the digital broadcast receiving device 30 as described above.
Further, as described above, the main board 40 and the memory card board 50 are separated from each other and are connected by the cable 6. The cable 6 connects the serial communication interface 5 forming the main board 40 and the serial communication interface 7 forming the memory card board 50 by serial communication.
[0041]
With such a configuration, according to the embodiment of the present invention, a digital board on which a CPU is mounted and a memory card board are arranged separately from each other via a cable as in a digital broadcast receiving apparatus. Even in such a configuration, since the number of signals connected to the cable can be reduced by converting it into a serial bus signal, the filter circuit for EMI noise suppression can be simplified. Further, EMI noise emitted as a residual component can be reduced. Therefore, the performance of the analog signal processed in the digital broadcast receiving device 30 can be improved.
[0042]
FIG. 4 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to another embodiment of the present invention.
[0043]
The same reference numerals are given to the description overlapping with the above description, and the description is omitted. Since the main board 40 has the same configuration as that of the above-described embodiment, the memory card board 50 will be described.
[0044]
In the embodiment of the present invention, the memory board 50 of the digital broadcast receiving device 30 includes two memory card holders.
[0045]
Reference numeral 11A is the memory card 1. Reference numeral 10A denotes a memory card holder to which a memory card is externally connected. Reference numeral 8A is a memory card controller, which is electrically connected to the memory card holder 10A via the connection means 9A. The memory card controller 8A extracts data stored in the memory card 11A connected to the memory card holder 10A. Conversely, the data supplied to the memory card controller 8A is stored in the memory card 11A.
[0046]
Reference numeral 11B is the memory card 2. Reference numeral 10B denotes a memory card holder to which a memory card is externally connected. Reference numeral 8B denotes a memory card controller, which is electrically connected to the memory card holder 10B via the connection means 9B. The memory card controller 8B extracts data stored in the memory card 11B connected to the memory card holder 10B. Conversely, the data supplied to the memory card controller 8B is stored in the memory card 11B.
[0047]
Here, the memory card 1 and the memory card 2 are the same selected from, for example, SSFDC (Smartmedia (registered trademark)), compact flash (registered trademark), SD memory card (registered trademark), memory stick (registered trademark), and the like. It may be a type of memory card or a different type of memory card. For example, both the memory card 1 and the memory card 2 may be SSFDC (Smartmedia (registered trademark)).
[0048]
By connecting a plurality of memory cards in this manner, the digital broadcast receiving apparatus can mediate communication between the memory cards.
Further, the memory card 1 may be SSFDC (Smartmedia (registered trademark)) and the memory card 2 may be compact flash (registered trademark).
[0049]
By connecting different types of memory cards in this manner, the digital broadcast receiving apparatus can mediate communication between different types of memory cards.
Reference numeral 7 denotes a serial communication interface.
[0050]
The serial communication interface is electrically connected to the memory card controller 8A via the connection means 12A and to the memory card controller 8B via the connection means 12B.
[0051]
In other words, the memory card substrate 50 includes a memory card holder 10A, a memory card controller 8A, and connection means 9A via a connection means 12A, and a memory card holder 10B, a memory card controller 8B, and a connection means 9B via a connection means 12B. It is connected to the serial communication interface 7 by parallel communication.
[0052]
The memory card substrate 50 is disposed on the front surface, the upper surface, the side surface, and the like in the digital broadcast receiving device 30 as described above.
Further, as described above, the main board 40 and the memory card board 50 are separated from each other and are connected by the cable 6. The cable 6 connects the serial communication interface 5 forming the main board 40 and the serial communication interface 7 forming the memory card board 50 by serial communication.
[0053]
With such a configuration, according to the embodiment of the present invention, a digital board on which a CPU is mounted and a memory card board are arranged separately from each other via a cable as in a digital broadcast receiving apparatus. Even in such a configuration, since the number of signals connected to the cable can be reduced by converting it into a serial bus signal, the filter circuit for EMI noise suppression can be simplified. Further, EMI noise emitted as a residual component can be reduced. Therefore, the performance of the analog signal processed in the digital broadcast receiving device 30 can be improved.
[0054]
FIG. 5 is a diagram for explaining the number of signals of the digital broadcast receiving apparatus when serial communication is not used. FIG. 5 is a list of signals used in the SSFDC (SmartMedia (registered trademark)) standard. Such information can be obtained, for example, from the Internet (HYPERLINK "http://www.ssfdc.or.jp/japanese/index.htm" http://www.ssfdc.or.jp/japanese/index.html). htm).
[0055]
From this figure, the power supply Vcc has a total of two terminal numbers 12 and 22, the ground Vss has a total of three terminal numbers 1, 10, and 11, and the other signal lines have a total of 15 excluding these. .
[0056]
That is, in parallel communication before using the embodiment of the present invention, in the case of SSFDC (SmartMedia (registered trademark)), a total of 20 signals (memory bus signals) were required.
[0057]
FIG. 6 is a diagram for explaining the number of signals of the digital broadcast receiving apparatus when serial communication is not used. FIG. 6 is a list of signals used in the CompactFlash (registered trademark) card standard.
[0058]
From this figure, the power supply Vcc has a total of two terminal numbers 13 and 38, the GND has a total of two terminal numbers 1 and 50, and the other signal lines have a total of 46 lines excluding these.
[0059]
That is, in the parallel communication before using the embodiment of the present invention, in the case of CompactFlash (registered trademark), a total of 48 signals (memory bus signals) were required.
[0060]
FIG. 7 is a diagram illustrating a reduction in the number of signals in the digital broadcast receiving apparatus according to the embodiment of the present invention.
[0061]
In the embodiment of the present invention, an interface (IC) corresponding to USB (Universal Serial Bus), which is one of the serial bus standards, is used as the serial communication interface unit 5 and the serial communication interface unit 7. FIG. 7 is a USB signal table, which can be obtained from the Internet (http://www.usb.org/).
[0062]
As can be seen from FIG. 7, when USB is used as the serial communication interface unit 5 and the serial communication interface unit 7, the total number of signals (memory bus signals) can be four. That is, the number of signals in SSFDC (SmartMedia (registered trademark)) in parallel communication (total 20) or the number of signals in compact flash (registered trademark) (total 48) can be reduced to four.
[0063]
FIG. 8 is a diagram illustrating a reduction in the number of signals in the digital broadcast receiving apparatus according to the embodiment of the present invention.
[0064]
In the embodiment of the present invention, an interface (IC) corresponding to an I2C bus which is one of the serial bus standards is used as the serial communication interface unit 5 and the serial communication interface unit 7. FIG. 8 is a signal table of the I2C bus.
[0065]
As can be seen from FIG. 8, when an I2C bus is used as the serial communication interface unit 5 and the serial communication interface unit 7, the total number of signals (memory bus signals) can be three. That is, the number of signals in SSFDC (SmartMedia (registered trademark)) in parallel communication (total 20) or the number of signals in compact flash (registered trademark) (total 48) can be reduced to three.
[0066]
FIG. 9 is a diagram illustrating a reduction in the number of signals in the digital broadcast receiving apparatus according to the embodiment of the present invention.
[0067]
In the embodiment of the present invention, an interface (IC) corresponding to JIS C6361 (commonly known as RS-232C), which is one of the serial bus standards, is used as the serial communication interface unit 5 and the serial communication interface unit 7. FIG. 9 is a signal table of RS-232C.
[0068]
As can be seen from FIG. 9, when RS-232C is used as the serial communication interface unit 5 and the serial communication interface unit 7, the total number of signals (memory bus signals) can be nine. That is, the number of signals in SSFDC (SmartMedia (registered trademark)) in parallel communication (total 20) or the number of signals in compact flash (registered trademark) (total 48) can be reduced to nine.
[0069]
As described above, according to the embodiment of the present invention, in a digital broadcast receiving apparatus, a first board on which a CPU, a program memory, a working memory, and a serial communication interface (serial communication controller) are mounted; The memory card controller and the second board on which the memory card holder is mounted are connected via a serial bus interface, and the memory card data is transferred by a serial bus signal to reduce the number of signals required for connection between the boards. Can be reduced. Then, EMI noise radiated from the connection cable to the outside can be reduced. Also, since the number of noise suppression components can be reduced, a low-cost memory card interface can be provided.
[0070]
In the above description, as an example of the digital broadcast receiving apparatus, a television type with a built-in digital broadcast receiving apparatus having a display device such as a cathode ray tube or a plasma display panel has been described, but the present invention is not limited to this. The present invention is also applicable to a set-top box type (STB type) for adding a digital broadcast receiving function by connecting to a display device configured in an existing television device.
[0071]
【The invention's effect】
As described above, according to the embodiment of the present invention, a digital board on which a CPU is mounted, such as a digital broadcast receiving apparatus, and a memory card board are arranged at locations separated by a cable. With such a configuration, there is an effect that the number of signals connected to the cable can be converted into serial bus signals and reduced.
[0072]
Further, there is an effect that the filter circuit for EMI noise suppression can be simplified.
[0073]
Further, there is an effect that EMI noise emitted as a residual component can be reduced. Therefore, there is an effect that the performance of the analog signal in the digital broadcast receiving device can be improved.
[0074]
Further, according to another embodiment, there is an effect that the digital broadcast receiving apparatus can mediate communication between the memory cards by configuring a plurality of memory card slots.
[Brief description of the drawings]
FIG. 1 is a schematic view of a digital broadcast receiving apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic view showing a state of connection between a main board and a memory card board according to the embodiment of the present invention.
FIG. 3 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to the embodiment of the present invention.
FIG. 4 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to another embodiment of the present invention.
FIG. 5 is a diagram for explaining the number of signals when serial communication is not used.
FIG. 6 is a diagram illustrating the number of signals when serial communication is not used.
FIG. 7 is a view for explaining reduction of the number of signals according to the embodiment of the present invention;
FIG. 8 is a view for explaining reduction of the number of signals according to the embodiment of the present invention.
FIG. 9 is a view for explaining reduction of the number of signals according to the embodiment of the present invention.
[Explanation of symbols]
1 ... CPU
2 ··· Program memory 3 ··· Working memory 4 ··· Communication bus 5 ··· Serial communication interface 6 ··· Cable 7 ··· Serial communication interface 8 ··· Memory card controller 10 ··· Memory card Holder 11 Memory card 30 Digital broadcast receiver 31 Memory card slot 40 Main board 50 Memory card board

Claims (7)

In a digital broadcast receiving apparatus in which a removable storage medium is connected from the outside,
A digital broadcast signal processing unit that converts a received digital broadcast signal into a video signal,
A first serial communication interface provided on the digital broadcast signal processing unit side, which converts a serial signal into a parallel signal when input, and outputs a parallel signal when a parallel signal is input; Department and
A storage medium data processing unit that is provided separately from the digital broadcast signal processing unit and extracts data stored in a storage medium connected from the outside;
A second serial communication interface provided on the storage medium data processing unit side, which converts a serial signal into a parallel signal when input, and outputs a parallel signal when converted into a serial signal; Department and
A digital broadcast receiving apparatus, comprising: serial communication means for connecting the first serial communication interface unit and the second serial communication interface unit by serial communication. The digital broadcast signal processing unit and the first serial communication interface unit are configured on a first substrate, and the storage medium data processing unit and the second serial communication interface unit are connected to the first substrate. The digital broadcast receiving device according to claim 1, wherein the digital broadcast receiving device is configured on a second substrate provided separately. In a digital broadcast receiving apparatus in which a removable storage medium is connected from the outside,
Video signal conversion processing means for converting a received digital broadcast signal into a video signal; converting a serial signal into a parallel signal when input; and converting a parallel signal into a serial signal when input. A digital broadcast signal processing unit having a first serial communication interface unit for outputting
A storage medium mounting unit to which a storage medium connected from the outside is mounted, a storage medium data extraction unit that extracts data stored in the mounted storage medium, and data extracted by the storage medium data extraction unit And a second serial communication interface unit that converts a parallel signal into a parallel signal when a serial signal is input, and outputs a parallel signal when a parallel signal is input. A data processing unit;
A digital broadcast receiving apparatus comprising: serial communication means for connecting the first serial communication interface unit and the second serial communication interface unit by serial communication. 4. The digital broadcast receiving device according to claim 1, wherein the storage medium is a memory card. The digital broadcast receiving device according to claim 4, wherein the storage medium mounting unit is a memory card holder, and the storage medium data extraction unit is a memory card controller. The digital broadcast receiving device according to claim 5, wherein the storage medium mounting unit is configured to connect a plurality of storage media. Extracting data stored in a storage medium connected from the outside,
Receiving the extracted data, converting the data into a serial signal and outputting the signal;
Receiving the output data in the form of a serial signal, converting the data to a parallel signal form, and outputting the converted data;
A method of receiving the output data in the form of a parallel signal and converting the data into a video signal.

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