GB2477603A - CICAM digital broadcast receiver with TS signal frequency conversion - Google Patents
CICAM digital broadcast receiver with TS signal frequency conversion Download PDFInfo
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- GB2477603A GB2477603A GB1100254A GB201100254A GB2477603A GB 2477603 A GB2477603 A GB 2477603A GB 1100254 A GB1100254 A GB 1100254A GB 201100254 A GB201100254 A GB 201100254A GB 2477603 A GB2477603 A GB 2477603A
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- 238000006243 chemical reaction Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 18
- 240000008042 Zea mays Species 0.000 claims 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims 1
- 235000005822 corn Nutrition 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 238000009434 installation Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/418—External card to be used in combination with the client device, e.g. for conditional access
- H04N21/4181—External card to be used in combination with the client device, e.g. for conditional access for conditional access
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4383—Accessing a communication channel
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4385—Multiplex stream processing, e.g. multiplex stream decrypting
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4385—Multiplex stream processing, e.g. multiplex stream decrypting
- H04N21/43853—Multiplex stream processing, e.g. multiplex stream decrypting involving multiplex stream decryption
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6112—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving terrestrial transmission, e.g. DVB-T
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Theoretical Computer Science (AREA)
- Circuits Of Receivers In General (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
An apparatus and method comprising receiving a digital TV broadcast and outputting a transport stream (TS) signal, decrypting the TS signal when a conditional access module (CAM) is inserted in a common interface (CI) unit, decoding the TS signal, and converting the TS signal input to the CI unit so that the TS signal has a frequency equal to or higher than the highest frequency among the frequencies of the TS signals corresponding to the bit rate received from the digital broadcast. A buffer may save the received TS signal and append data to it at a frequency equal to or higher than the highest frequency. DVB-T2 broadcasting can output TS signals at higher frequencies (approx 5.1MHz) than DVB-T (approx 2-3MHz) which can cause data dropouts in the CICAM TS signal (which may be fixed at 5MHz) when changing channel and prevent microprocessor decoding. This configuration allows a CICAM to output a TS signal at a variable frequency or a fixed frequency free from data dropouts.
Description
I
DESCRIPTION
DIGITAL BROADCAST RECEIVING APPARATUS
AND DIGITAL BROADCAST RECEIVING METHOD
FIELD OF THE INVENTION
The present invention relates to a digital broadcast receiving apparatus containing a CI (Common Interface) decrypting encrypted image data.
BACKGROUND OF THE INVENTION
In Europe, digital broadcast receiving apparatus use a CE (Common Interface) for viewing a pay broadcast. The front end unit of a digital broadcast receiving apparatus receives a digital broadcast and outputs a TS (Transport Stream) signal. Then, if a CICAM (Common Interface Conditional IS Access Module) is inserted into the CI for viewing a pay broadcast, the signal output from the front end unit is sent to the IS input signal path selecting unit placed at a stage subsequent to the CI through the CI, by the US output signal path selecting unit. Meanwhile, if a CICAM is not inserted into the Cl, the TS signal output from the front end unit is sent to the IS input signal path selecting unit not through the CI.
If the TS signal received from the TS output signal path selecting unit is encrypted, the CICAM decrypts the TS signal and outputs the resulting signal to the TS input signal path selecting unit placed at a stage subsequent to the CI.
Meanwhile, if the TS signal is not encrypted, the CICAM directly outputs the TS signal to the TS input signal path selecting unit. The CICAM converts data of the TS signal for decryption. Hence, the frequency of the TS signal output from the CICAM is different from that input to the CICAM in timing and cycle.
S
The standard of the Cl defines an upper limit of a bit rate output from a CICAM; however, does not determine a frequency actually output. As a result, different manufacturers design a C[CAM in different ways such as for a frequency at which a TS signal is output. Further, manufacturers do not open
their CICAM specifications.
For example, there is a CICAM that outputs a TS signal having undergone a signal process by the CICAM at an output frequency that is variable each time according to the frequency of a TS signal having been input. There is another CICAM that first outputs a TS signal having undergone a signal process at a frequency corresponding to that of a TS signal having been input for the first time after power-up, and from then on continues outputting a TS signal at a frequency fixed to that first determined even if the frequency of a TS signal having been input changes as long as the CICAM is not reset.
For example, Japanese Patent Unexamined Publication No. 2008-066764 discloses the following structure. That is, first the TS input signal path selecting unit passes selectively one of a TS signal input from the Cl and from the IS output signal path selecting unit, to the micro processor according to an actual path of the TS signal. Next, the micro processor decodes the TS signal input from the TS output signal path selecting unit and outputs it to the image output unit. Then, the TS signal is output as an image by the image output unit.
Conventionally, digital broadcasting has been using DVB-T in Europe, and with a conventional digital broadcast receiving apparatus, the front end unit outputs a TS signal at a frequency of approximately 2 to 3 MHz. Hence, a CICAM that determines a subsequent output frequency on the basis of a frequency first input outputs a frequency of around 5 MHz with respect to input of approximately 2 to 3 MHz for example.
With DVB-T2 by which broadcasting has started in recent years, a front end unit outputs a TS signal at a frequency of approximately 5.1 Ml-Iz for some types of broadcasting. In the above-described CICAM, which determines a subsequent output frequency on the basis of a frequency first input, the assumption is made that a TS signal is output at a frequency fixed to around 5 MHz. In this state (DVB-T2), when switching is made to a channel where the front end unit outputs a TS signal at a frequency of approximately 5.1 MHz, the CICAM outputs a TS signal at a frequency as low as around 5 MHz, causing dropouts in IS signal data, which prevents the micro processor unit from decoding. Meanwhile, resetting the CICAM in order to avoid being unable of decoding requires long time to change the channel.
SUMMARY OF THE INVENTION
A digital broadcast receiving apparatus of the present invention includes a front end unit; a Cl (Common Interface) unit, a TS input signal path selecting unit, and a micro processor unit. The front end unit receives a digital broadcast and outputs a IS (Transport Stream) signal. The CI unit has a CICAM (Common Interface Conditional Access Module) inserted thereinto to decrypt the IS signal. The TS input signal path selecting unit outputs selectively one of the TS signal output from the front end unit and the TS signal decrypted by the CI unit. The micro processor unit decodes the TS signal selected by the IS signal input path selecting unit. When a CICAM is inserted into the CI unit of the digital broadcast receiving apparatus with power applied thereto, or when power is applied to the apparatus with the CICAM inserted into the CI unit, the apparatus converts the TS signal first input to the CI unit so that the IS signal has a frequency equal to or higher than the highest one among those of TS signals corresponding to the bit rate received from the digital broadcast.
S
This configuration allows the frequency of a TS signal output from the CICAM to be set to a frequency equal to or higher than the highest one among those in receivable broadcasts. This enables not only a CICAM that outputs a TS signal at a variable frequency but a CICAM that outputs a IS signal at a fixed frequency to send a IS signal free from data dropouts to the micro processor. Consequently, the micro processor can normally decode a TS signal received.
The digital broadcast receiving method of the present invention includes a step of receiving a digital broadcast and outputting a TS signal; a step of decrypting the TS signal with a CICAM inserted into a CI unit; a step of selecting one of the TS signal output in the step of outputting and the TS signal decrypted in the step of decrypting; a step of decoding the TS signal selected in the step of selecting; and a step of converting the TS signal first input to the Cl unit so that the TS signal has a frequency equal to or higher than the highest one among those of TS signals corresponding to the bit rate received from the digital broadcast.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of digital broadcast receiving apparatus 100 according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating operation of digital broadcast receiving apparatus 100.
FIG. 3 is a block diagram of another example of a digital broadcast receiving apparatus according to the embodiment of the present invention.
FIG. 4 is a block diagram of yet another example of a digital broadcast receiving apparatus according to the embodiment of the present invention.
FIG. 5 is a block diagram of still another example of a digital broadcast receiving apparatus according to the embodiment of the present invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
EXEMPLARY EMBODIMENT
Hereinafter, a description is made of a configuration of digital broadcast receiving apparatus 100 according to the embodiment of the present invention.
FIG. 1 is a block diagram of digital broadcast receiving apparatus 100.
Digital broadcast receiving apparatus 100 includes front end unit 110, TS (Transport Stream) output signal path selecting unit 120, Cl (Common io Interface) unit 130, TS input signal path selecting unit 140, micro processor unit 150, and image output unit 160.
Front end unit 110 includes a tuner (not shown) receiving a broadcast wave; a demodulating unit (not shown) receiving a broadcast wave and outputting a TS signal; and buffer 112. Unit 110 receives a broadcast wave as input and outputs a I'S signal to TS output signal path selecting unit 120. A TS signal contains image data to be broadcast. Concretely, a TS signal includes a DATA signal containing broadcasting contents; a CLK signal that is a clock signal synchronized with digital data of a TS signal; a VALID signal indicating that a TS signal is valid; and a SYNC signal indicating top data of a TS signal.
Front end unit 110, when first outputting a TS signal to CI unit 130, outputs the TS signal at a frequency equal to or higher than the highest one among those in receivable broadcasts. Here, "when first outputting a TS signal to CI unit 130" refers to the following two cases. One is when a CICAM (Common Interface Conditional Access Module, not shown) is inserted into CI unit 130 while digital broadcast receiving apparatus 100 is operating normally.
The other is when power is applied to digital broadcast receiving apparatus 100 with a CICAM inserted into CI unit 130. Further, front end unit 110, when directed so by micro processor unit 150 as well, outputs a TS signal at a frequency equal to or higher than the highest one among those in receivable broadcasts. Front end unit 110 uses above-described buffer 112 for example in order to output the above-described frequency equal to or higher than the highest TS signal among those in receivable broadcasts. Operation of buffer II 2 is described later.
TS output signal path selecting unit 120 selects to which unit to input a TS signal output from front end unit 110, Cl unit 130 or TS input signal path selecting unit 140, on the basis of directions from micro processor unit 150.
The assumption is made that CI unit 130 has a CICAM inserted thereinto for viewing a pay broadcast in Europe. A CICAM decrypts an encrypted TS signal. Cl unit 130 outputs the TS signal decrypted by the CECAM to IS input signal path selecting unit 140. Further, when a CICAM is inserted into Cl unit while digital broadcast receiving apparatus 100 is operating normally with is power applied thereto, or when power is applied to apparatus 100 with a CICAM inserted into CI unit 130, Cl unit 130 gives notice of presence of the CICAM to micro processor unit 150.
TS input signal path selecting unit 140 outputs either a TS signal input from TS output signal path selecting unit 120 or a TS signal input from Cl unit 130, to micro processor unit 150 on the basis of directions from micro processor unit 150.
As shown in FIG. 1, micro processor unit 150 controls each unit of digital broadcast receiving apparatus 100. Further, unit 150 decodes a TS signal and outputs the resulting signal to image output unit 1 60 to make unit 1 60 produce a display. Unit 150 decodes and outputs audio and data signals to be broadcast as well. Unit 150 preliminarily stores a frequency equal to or higher than the highest one among those in receivable broadcasts. To store, a user may direct digital broadcast receiving apparatus 100 to search all the broadcasting frequency bands for receivable broadcasts when apparatus 100 is installed, for example.
In this way, micro processor unit 150 stores a frequency (e.g. 5.3 MHz) equal to or higher than the highest one among those of TS signals. Then, unit exercises control so that front end unit 110 outputs a TS signal at a frequency (i.e. 5.3 MHz) equal to or higher than the highest one among those of TS signals.
Concretely, buffer 112 of front end unit 110 saves a TS signal received.
Then, front end unit 110 appends data equivalent to the IS signal at the above-described frequency higher than the highest, to the IS signal saved in buffer 112. Then, front end unit 110 has only to output the IS signal with data appended thereto at a frequency equal to or higher than the highest.
Next, a description is made of operation of digital broadcast receiving apparatus 100 according to the embodiment of the present invention. FIG. 2 is a flowchart illustrating operation of apparatus 100.
First, front end unit 110 selects a channel on the basis of directions from micro processor unit 150 (step S210). Next, unit 150 checks if CI unit 130 has a CICAM inserted thereinto (step S220). The same checking as in step S220 is made when power is turned on with a CICAM inserted. Instep S220, if CI unit has a CICAM inserted thereinto, or if power is turned on with a CICAM inserted into CI unit 130 ("Yes" in step S220), checking is made if a clock (shown by "CLK") is set to the CICAM (step S230).
Meanwhile, if CI unit 130 does not have a CICAM inserted thereinto ("No' in step S220), the process flow proceeds to step S280.
In step S230, if a clock is not set to the CICAM ("No" in step S230), front end unit 110 outputs a TS signal at a frequency equal to or higher than the highest one among those received in digital broadcasting, when front end unit first outputs a TS signal to CI unit 130 on the basis of directions from micro processor unit 1 50. With DVB-T or DVB-T2 for example, the frequency of a TS signal is set to approximately 5.3 MHz (step S240).
Meanwhile, if a clock is set to the CICAM ("Yes" in step S230), the process flow proceeds to step S280.
Next, TS output path selecting unit 120 sets CI unit 130 as output destination of a TS signal and outputs the TS signal to CI unit 1 30 (step S250).
Micro processor unit 150 directs TS input path selecting unit 140 to make selection so as to receive a TS signal from CI unit 130 as input (step S260).
Here, with a method in which a CICAM inserted into CI unit 130 fixes an output frequency according to an initial value, CI unit 130 outputs a TS signal at a frequency of approximately 5.3 MHz.
Next, after CI unit 1 30 outputs a TS signal at a frequency of approximately 5.3 MHz, front end unit 110 returns the frequency of a TS signal to a frequency corresponding to a TS signal received (step S270). That is, micro processor unit 1 50 sets the frequency of a TS signal output from front end unit 110 so as to be variable in accordance with a broadcasting state. By doing this way, the TS signal becomes equivalent to a TS signal having been broadcast, which prevents malfunction at each subsequent-stage unit to the utmost.
Further, the decreased TS signal frequency contributes to reducing power consumption.
As described above, the digital broadcast receiving method according to the embodiment includes a step of receiving a digital broadcast and outputting a TS signal; a step of decrypting the TS signal with a CICAM inserted into Cl unit 130; a step of selecting one of a TS signal output in the step of outputting and a TS signal decrypted in the step of decrypting; a step of decoding the TS signal selected in the step of selecting; and a step of converting a TS signal Iirst input to Cl unit 130 so that the IS signal has a frequency equal to or higher than the highest one among those of TS signals corresponding to the bit rate received from the digital broadcast. Hence, not only a CICAM that outputs a TS signal at a variable frequency but a CICAM that outputs a TS signal at a fixed frequency provides a TS signal free from data dropouts. Consequently, a IS signal received can be normally decoded.
Then, micro processor unit 150 decodes a TS signal (step S280), and image output unit 1 60 outputs signals of image, audio, and data (step S290).
From then on, front end unit 110 only sets the frequency of a IS signal to a frequency corresponding to the bit rate for broadcasting, and does not set to a frequency (approximately 5.3 MHz in this example) equal to or higher than the highest one among those in receivable broadcasts. When a CICAM is removed, inserted, or reset, TS output path selecting unit 120 outputs a IS signal to TS IS input path selecting unit 140. Then, front end unit 110 repeats the process from setting the frequency of a TS signal to a frequency (approximately 5.3 MHz in this example) equal to or higher than the highest one among those in receivable broadcasts.
As described above, digital broadcast receiving apparatus 100 according to the embodiment includes front end unit 110 receiving a digital broadcast and outputting a TS signal; CI unit 130 having a CICAM inserted thereinto decrypting a TS signal; TS input signal path selecting unit 120 outputting selectively one of a TS signal output from front end Unit 110 and a TS signal decrypted by CI unit 130; and micro processor unit 150 decoding the TS signal selected by IS signal input path selecting unit 120.
When a CICAM is inserted into CI unit 130 of' digital broadcast receiving apparatus 100 with power applied thereto, or when power is applied to apparatus 100 with a CECAM inserted into Cl unit 130, apparatus 100 converts the frequency of a IS signal first input to Cl unit 130 to a frequency equal to or higher than the highest one among those of TS signals corresponding to the bit rate received from the digital broadcast.
With such a configuration, the frequency of a TS signal first output to Cl unit 130 is equal to or higher than the highest one among those of TS signals in receivable broadcasts. As a result, Cl unit 130 can cover all the frequencies being broadcast as those of TS signals to be input. Hence, digital broadcast receiving apparatus 100 according to this embodiment allows viewing a broadcast without requiring resetting the frequency of a TS signal by resetting Cl unit 1 30 when the channel has been changed. This results in reducing time for changing the channel.
Here, TS output signal path selecting unit 120 may be a distributor capable of outputting a TS signal simultaneously to CI unit 130 and TS input signal path selecting unit 140. That is, unit 140 may input a TS signal output from front end unit 110 to at least one of unit 140 and CI unit 130.
In this embodiment, micro processor unit 150 is assumed to preliminarily store a frequency equal to or higher than the highest one among those of TS signals in broadcasts that digital broadcast receiving apparatus 100 can receive; however, unit 150 may extract a frequency equal to or higher than the highest one among those of TS signals received by front end unit 11 0 and store it, and when a CICAM is inserted into CI unit 130 for the first time, micro processor unit 150 may control front end unit 110 so as to output a TS signal at a frequency equal to or higher than the highest one among those of TS signals in broadcasts having been received. In this case, a frequency equal to or higher than the highest one among those of TS signals in receivable broadcasts does not need to be preliminarily set to micro processor unit 150. Further, even when a
S
IS signal.of a new higher frequency becomes receivable, the same handling can be used.
In this embodiment, micro processor unit 150 is used to decode a IS signal; however, dedicated hardware may be used. Further, micro processor unit 150 may store data required for controlling each unit of digital broadcast receiving apparatus 100.
In this embodiment, micro processor unit 1 50 stores a frequency equal to or higher than the highest one among those of TS signals in receivable broadcasts; however, front end unit 110 may store such a frequency. In this case, unit 110 can output a TS signal at such a frequency only by an internal process.
In this embodiment, as shown in FIG. 1, front end unit 110 is provided with buffer 112 in order to increase the frequency of a TS signal; however, instead of providing front end unit 110 with buffer 112, IS output signal path Is selecting unit 120A may be provided with buffer 112A in order to increase the frequency of a TS signal, as shown in FIG. 3, which is a block diagram of another example of digital broadcast receiving apparatus IOOA according to the embodiment of the present invention. Then, as described above, instead of front end unit 1 1 OA, buffer 11 2A of IS output signal selecting unit may be used to increase the frequency of a IS signal. That is, TS output signal path selecting unit 120A has buffer I 12A, which saves a TS signal received by front end unit 11 OA. Then, buffer 11 2A appends data to the TS signal and outputs the resulting TS signal to CI unit 130 at a frequency equal to or higher than the highest one.
Here, the configuration and operation of buffer 11 2A may be the same as those of buffer 112, and thus their description is omitted. With such a configuration, even if IS output signal path selecting unit 120A is provided with
S
a distributor capable of outputting a TS signal simultaneously to CE unit 130 and TS input signal path selecting unit 140, a special process is not required in i's input signal path selecting unit 140, which is at a stage subsequent to the distributor.
1-lere, another configuration may be used as shown in FIG. 4. That is, TS generator 122 is used to transmit a I'S signal having a frequency equal to or higher than the highest one among those of TS signals in receivable broadcasts, to IS output signal path selecting unit l2OB only for the first time. FIG. 4 is a block diagram of yet another example of digital broadcast receiving apparatus IOOB according to the embodiment of the present invention. As shown in FIG. 4, TS generator 122 outputs a TS signal having a frequency equal to or higher than the highest one among those of TS signals in receivable broadcasts, to TS input signal path selecting unit 140 only for the first time. A TS signal having such a frequency has only to be stored in micro processor unit 150A when broadcasting signals are searched for at installation. When a TS signal of a frequency higher than those stored in micro processor unit I 50A is received, the TS signal currently stored is updated with the received one, thereby covering all the frequencies of TS signals including one newly broadcast.
With such a configuration, TS generator 122 first outputs a TS signal to CI unit 130 at a frequency equal to or higher than the highest one among those of TS signals in receivable broadcasts, and thus CI unit 130 outputs all the frequencies covering those being broadcast. Hence, digital broadcast receiving apparatus IOOB according to this embodiment allows viewing a broadcast without requiring resetting the frequency of a TS signal to be output by resetting CI unit 130 when the channel has been changed.
As shown in FIG. 5, another configuration may be used. That is, TS generator 122A is used to transmit a TS signal of a frequency equal to or higher
S
than the highest one among those of TS signals in receivable broadcasts, to front end unit ii OB only for the first time. FIG. 5 is a block diagram of still another example of digital broadcast receiving apparatus 100C according to the embodiment of the present invention. As shown in FIG. 5, IS generator 122A outputs a TS signal of a frequency equal to or higher than the highest one among those of TS signals in receivable broadcasts, to front end unit I lOB only for the first time. A TS signal. having such a frequency has only to be stored in micro processor unit 150A when broadcasting signals are searched for at installation.
When a TS signal having a frequency higher than those stored in micro processor unit 150A is received, the IS signal currently stored is updated with the received one, thereby covering all the frequencies of TS signals including one newly broadcast.
Claims (10)
- CLAIMS1. A digital broadcast receiving apparatus receiving a digital broadcast, corn pri sing: a front end unit receiving a digital broadcast and outputting a (Transport Stream) signal; a CI (Common Interface) unit having a CICAM (Common Interface Conditional Access Module) inserted thereinto decrypting the TS signal; a TS input signal path selecting unit outputting selectively one of the TS JO signal output from the front end unit and the TS signal decrypted by the Cl unit; and a micro processor unit decoding the TS signal selected by the IS signal input path selecting unit, wherein, when a CICAM is inserted into the CI unit of the digital broadcast IS receiving apparatus with power applied thereto, or when power is applied to the digital broadcast receiving apparatus with the CICAM inserted into the CI unit, the digital broadcast receiving apparatus converts the TS signal first input to the CI unit so that the TS signal has a frequency equal to or higher than the highest frequency among the frequencies of the TS signals corresponding to a bit rate received from the digital broadcast.
- 2. The digital broadcast receiving apparatus of claim 1, wherein the front end unit has a buffer, wherein the buffer saves the TS signal received by the front end unit, and wherein the front end unit appends data to the TS signal and outputs the IS signal with the data appended thereto at a frequency equal to or higher than the highest frequency.S
- 3. The digital broadcast receiving apparatus of claim I, further comprising a IS generator, wherein the IS generator outputs the TS signal having the frequency equal to or higher than the stored highest frequency to the front end unit.
- 4. The digital broadcast receiving apparatus of claim I, further comprising a TS output signal path selecting unit receiving the IS signal output from the front end unit as input, wherein the TS output signal path selecting unit inputs the TS signal output by the front end unit to at least one of the TS input signal path selecting unit and the Cl unit.
- 5. The digital broadcast receiving apparatus of claim 4, is wherein the IS output signal path selecting unit has a buffer, wherein the buffer saves the TS signal received by the front end unit, and wherein the buffer appends data to the TS signal and outputs the TS signal with the data appended thereto at a frequency equal to or higher than the highest frequency.
- 6. The digital broadcast receiving apparatus of claim 4, further comprising a IS generator, wherein the IS generator outputs the TS signal having the frequency stored equal to or higher than the highest frequency to the front end unit.
- 7. The digital broadcast receiving apparatus of claim 4, further comprising a IS generator,Swherein the IS generator outputs the TS signal having the frequency stored equal to or higher than the highest frequency to the TS output signal path selecting unit.
- 8. A method of receiving a digital broadcast, comprising: a step of receiving a digital broadcast and outputting a TS signal; a step of decrypting the TS signal with a CICAM inserted into a CI unit; and a step of selecting one of the TS signal output in the step of outputting and the TS signal decrypted in the step of decrypting; a step of decoding the TS signal selected in the step of selecting; a step of converting the TS signal first input to the CI unit so that the TS signal has a frequency equal to or higher than the highest frequency among the frequencies of the IS signals corresponding to a bit rate received from the digital broadcast.
- 9. The method of receiving a digital broadcast, of claim 8, wherein the step of converting includes: a step of saving the IS signal received; and a step of appending data to the TS signal and outputting the TS signal with the data appended thereto at a frequency equal to or higher than the highest frequency.
- 10. The method of receiving a digital broadcast, of claim 8, wherein the step of converting includes: a step of saving the IS signal received; and a step of outputting the IS signal having a frequency equal to or higher than the highest frequency of the TS signal saved.Amendment to the claims have been filed as followsCLAIMS1. A digital broadcast receiving apparatus receiving a digital broadcast, comprising: a front end unit receiving a digital broadcast and outputting a TS (Transport Stream) signal; a CI (Common Interface) unit having a CICAM (Common Interface Conditional Access Module) inserted thereinto decrypting the TS signal; a TS input signal path selecting unit outputting selectively one of the TS signal output from the front end unit and the TS signal decrypted by the CI unit; and a micro processor unit decoding the TS signal selected by the TS signal input path selecting unit, wherein, when a CICAM is inserted into the CI unit of the digital broadcast receiving apparatus with power applied thereto, or when power is applied to the digital broadcast receiving apparatus with the CICAM inserted into the CI unit, the digital broadcast receiving apparatus converts the TS signal first input to the CI unit so that the TS signal has a frequency equal to or higher than the highest frequency among the frequencies of the TS signals corresponding to a bit rate received from the digital broadcast.2. The digital broadcast receiving apparatus of claim 1, wherein the front end unit has a buffer, wherein the buffer saves the TS signal received by the front end unit, and wherein the front end unit appends data to the TS signal and outputs the TS signal with the data appended thereto at a frequency equal to or higher than the highest frequency.3. The digital broadcast receiving apparatus of claim 1, further comprising a TS generator, wherein the TS generator outputs a TS signal having a frequency equal to or higher than the highest frequency among the frequencies of the TS signals received from the digital broadcast to the front end unit.4. The digital broadcast receiving apparatus of claim 1, further comprising a TS output signal path selecting unit receiving the TS signal output from the front end unit as input, wherein the TS output signal path selecting unit inputs the TS signal output by the front end unit to at least one of the TS input signal path selecting unit and the CI unit.5. The digital broadcast receiving apparatus of claim 4, wherein the TS output signal path selecting unit has a buffer, wherein the buffer saves the TS signal received by the front end unit, and wherein the buffer appends data to the TS signal and outputs the TS signal with the data appended thereto at a frequency equal to or higher than the highest frequency.6. The digital broadcast receiving apparatus of claim 4, further comprising a TS generator, wherein the TS generator outputs a TS signal having a frequency equal to or higher than the highest frequency among the frequencies of the TS signals received from the digital broadcast to the front end unit.7. The digital broadcast receiving apparatus of claim 4, further comprising a TS generator, wherein the TS generator outputs a TS signal having a frequency equal to or higher than the highest frequency among the frequencies of the TS signals received from tile digital broadcast to the TS output signal path selecting unit.8. A method of receiving a digital broadcast, comprising: a step of receiving a digital broadcast and outputting a TS signal; a step of decrypting the TS signal with a CICAM inserted into a CI unit; and a step of selecting one of the TS signal output in the step of outputting and the TS signal decrypted in the step of decrypting; a step of decoding the TS signal selected in the step of selecting; a step of converting the TS signal first input to the CI unit so that the TS signal has a frequency equal to or higher than the highest frequency among the frequencies of the TS signals corresponding to a bit rate received from the digital broadcast.9. The method of receiving a digital broadcast, of claim 8, wherein the step of converting includes: a step of saving the TS signal received; and a step of appending data to the TS signal and outputting the TS signal with the data appended thereto at a frequency equal to or higher than the highest frequency.10. The method of receiving a digital broadcast, of claim 8, wherein the step of converting includes: a step of saving the TS signal received; and a step of outputting the TS signal having a frequency equal to or higher than the highest frequency of the TS signal saved. (0
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010022949A JP2011160385A (en) | 2010-02-04 | 2010-02-04 | Digital broadcast receiver |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201100254D0 GB201100254D0 (en) | 2011-02-23 |
| GB2477603A true GB2477603A (en) | 2011-08-10 |
| GB2477603B GB2477603B (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1100254.0A Expired - Fee Related GB2477603B (en) | 2010-02-04 | 2011-01-07 | Digital broadcast receiving apparatus and digital broadcast receiving method |
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| Country | Link |
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| JP (1) | JP2011160385A (en) |
| GB (1) | GB2477603B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050077404A (en) * | 2004-01-28 | 2005-08-02 | (주)아이앤씨테크놀로지 | A apparatus for prevention of data loss when change mode in the ci controller of set-top box |
| KR20080054473A (en) * | 2006-12-13 | 2008-06-18 | 주식회사 대우일렉트로닉스 | Method for providing initialized conditional access module in set-top box |
-
2010
- 2010-02-04 JP JP2010022949A patent/JP2011160385A/en active Pending
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2011
- 2011-01-07 GB GB1100254.0A patent/GB2477603B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050077404A (en) * | 2004-01-28 | 2005-08-02 | (주)아이앤씨테크놀로지 | A apparatus for prevention of data loss when change mode in the ci controller of set-top box |
| KR20080054473A (en) * | 2006-12-13 | 2008-06-18 | 주식회사 대우일렉트로닉스 | Method for providing initialized conditional access module in set-top box |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011160385A (en) | 2011-08-18 |
| GB2477603B (en) | 2011-12-28 |
| GB201100254D0 (en) | 2011-02-23 |
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Effective date: 20200107 |