Digital broadcast reception apparatus

TECHNICAL FIELD

[0001] The present invention relates to a digital broadcasting receiver that receives and demodulates a digital broadcasting wave and outputs a video signal and an audio signal.

BACKGROUND ART

[0002] In a digital broadcasting system using a satellite, for example, a video and audio signal is compressed using a digital signal compression technique, and a stream on which video and audio digital signals on a plurality of programs are time-division multiplexed (a transport stream) is broadcast via a transponder (a satellite relay). On the other hand, a broadcasting receiver for receiving such digital broadcasting selects by a tuner one of a plurality of transponders in digital broadcasting received through a dedicated antenna, selects by demultiplex processing one of a plurality of channels included in the one transponder, and decodes a digital signal on the selected channel, to output a video and audio signal.

[0003] In the above-mentioned digital broadcasting, PPV (Pay Per View) programs which can be purchased for each of the programs are broadcast, and a user can purchase and view the program which he or she desires to view by a remote control operation then and there. Further, a preview for informing a viewer what type of program is the PPV program is generally given for the purpose of urging the user to purchase the program. Within a period of the preview, when the PPV program is tuned in to, a part of the program can be viewed free of charge. Information related to the PPV program which is purchased by the user is generally transmitted to a charge information collection center through a telephone line on a predetermined date for each month, and a demand for payment corresponding to the amount of purchase is put to the user.

[0004] Meanwhile, a contract for purchase of the PPV program is concluded at the time point where a purchase operation is performed by a remote control. The user generally purchases the PPV program by a remote control operation during the preview period. Even if the PPV program cannot be viewed because the receiving condition is worsened by a sudden change in weather or cannot be viewed due to power failure, for example, after the purchase operation is performed, however, the user must pay the charge for purchase of the PPV program because the contract for purchase has already been concluded.

[0005] In view of the foregoing circumstances, an object of the present invention is to provide a digital broadcasting receiver capable of reducing the occurrence of situations where a charge for purchase is forced to be paid, although a purchased pay program cannot be viewed due to worsened weather, power failure, or the like.

DISCLOSURE OF INVENTION

[0006] In order to solve the above-mentioned problem, in a digital broadcasting receiver that receives and demodulates a digital broadcasting wave and outputs a video signal and an audio signal, a digital broadcasting receiver according to the present invention is characterized by comprising means for individually purchasing a pay program on the basis of a user operation, to make it possible to view the pay program; timer means for judging, on the basis of information related to a charge-free viewing time period of the pay program, an elapse of the charge-free viewing time period; and control means for performing pay program purchase processing immediately before an elapse of the charge-free viewing time period when it receives an instruction to purchase the pay program by a user.

[0007] In the above-mentioned configuration, even if the power fails after the purchase operation of the pay program is performed by the user, if the power failure occurs during a charge-free viewing time period, situations where a charge for purchase is forced to be paid, although the purchased pay program cannot be viewed, are prevented because the pay program purchase processing has not been performed yet.

[0008] Furthermore, in a digital broadcasting receiver that receives and demodulates a digital broadcasting wave and outputs a video signal and an audio signal, a digital broadcasting receiver according to the present invention is characterized by comprising means for outputting information representing the receiving condition of the digital broadcasting wave; means for individually purchasing a pay program on the basis of a user operation, to make it possible to view the pay program; timer means for judging, on the basis of information related to a charge-free viewing time period of the pay program, an elapse of the charge-free viewing time period; and control means for performing pay program purchase processing under the condition that the receiving condition is in an allowable range immediately before an elapse of the charge-free viewing time period when it receives an instruction to purchase the pay program by a user.

[0009] In the above-mentioned configuration, even if the broadcasting cannot be viewed due to a sudden change in weather after the purchase operation of the pay program is performed by the user, if the sudden change in weather occurs during a charge-free viewing time period, situations where a charge for purchase is forced to be paid, although the purchased pay program cannot be viewed are prevented because the pay program purchase processing has not been performed yet.

[0010] When the pay program purchase processing is not performed, a message indicating that the pay program purchase processing is not performed may be displayed on a screen. Further, the digital broadcasting receiver is so constructed as to perform processing for inquiring the user whether or not the pay program will be purchased even in the condition of low hierarchical broadcasting and perform purchase/non-purchase processing, conforming to a command issued by the user, corresponding to the inquiry processing.

BRIEF DESCRIPTION OF DRAWINGS

P-0011[0011]FIG. 1 is a block diagram showing a digital broadcasting receiver according to an embodiment of the present invention.

P-0012[0012]FIG. 2 is a flow chart showing an example of the contents of processing in the present invention.

P-0013[0013]FIG. 3 is an illustration showing a preview screen.

BEST MODE FOR CARRYING OUT THE INVENTION

P-0014[0014] An embodiment of the present invention will be described on the basis of FIGS. <b>1</b> to <b>3</b>. Here, a case where a user receives CS (Communication Satellite) digital broadcasting is exemplified.

P-0015[0015]FIG. 1 is a block diagram showing a digital broadcasting receiver <b>30</b> according to the present embodiment that receives CS digital broadcasting.

P-0016[0016] An antenna <b>1</b> is arranged in a predetermined direction outdoors, and receives a digital broadcasting signal sent from a CS. The antenna <b>1</b> generally comprises a frequency converter, and feeds to a tuner <b>2</b> a signal which has been subjected to receiving/frequency conversion.

P-0017[0017] The tuner <b>2</b> takes out a signal having a particular frequency out of high-frequency digital modulation signals including video and audio data. That is, it performs processing for selecting one of a plurality of transponders in digital broadcasting. Further, the tuner <b>2</b> comprises a demodulation circuit, an inverse interleave circuit, an error correcting circuit, and so forth, thereby to demodulate the selected digital modulation signal to output a transport stream. Further, the tuner <b>2</b> feeds to a CPU <b>13</b> an error rate obtained in error correction or a C/N ratio (they are information representing the receiving condition).

P-0018[0018] A descrambler <b>3</b> performs processing for releasing scrambling performed in pay broadcasting using key information incorporated in an IC card <b>21</b>A. Further, the descrambler <b>3</b> has a demultiplexer (DEMUX), and separates the transport stream which has been subjected to descramble processing into a video stream and an audio stream based on MPEG2 (Moving Picture Experts Group 2), and PSI/SI (Program Specific Information/Service Information). The demultiplexer feeds the video stream and the audio stream to an AV decoder <b>4</b>, and feeds the PSI/SI to the CPU <b>13</b>. A plurality of channels are multiplexed on the transport stream, as described above. Processing for selecting any one of the channels can be performed by taking out of the PSI/SI data indicating which packet ID in the transport stream is used to multiplex the arbitrary channel. The selection of the transport stream (the selection of the transponder) can be made on the basis of information related to the PSI/SI. Further, SI (service information) includes program information (the contents of a program, the time when the program begins, a time period during which the program is continued, genre information, etc.).

P-0019[0019] The AV decoder <b>4</b> comprises a video decoder for decoding the video stream and an audio decoder for decoding the audio stream. The video decoder decodes an inputted variable length code to find a quantization factor and a motion vector, thereby to carry out inverse DCT (Discrete Cosine Transformation) and motion compensation control based on the motion vector. The audio decorder decodes a coded signal which has been inputted, to generate audio data. The video data produced by the decoding is outputted to a video processing circuit <b>5</b>, and the audio data is outputted to an audio processing circuit <b>6</b>.

P-0020[0020] The video processing circuit <b>5</b> receives the video data from the AV decoder <b>4</b> and subjects the received video data to D/A (Digital-to-Analog) conversion, to convert the video data to a composite video signal, for example. The audio signal processing circuit <b>6</b> receives the audio data outputted from the AV decoder <b>4</b> and subjects the received audio data to D/A conversion, to generate an analog signal of a right (R) sound and an analog signal of a left (L) sound.

P-0021[0021] A video output circuit <b>7</b> and an audio output circuit <b>8</b> are constructed by comprising an output resistor, an amplifier, and so forth. An AV output terminal <b>9</b> is provided with an output unit (a set of a right/left audio output terminal or the like and a video output terminal or the like). A monitor <b>16</b> comprising a CRT (Cathode-Ray Tube) <b>16</b><i>a </i>and a speaker <b>16</b><i>b </i>is connected to the output unit by a video and audio code <b>17</b>.

P-0022[0022] An OSD (On-screen Display) circuit <b>12</b> produces video data based on character information and color information which are instructed to output from the CPU <b>13</b>, and outputs the produced video data to an adder <b>20</b>. The adder <b>20</b> performs processing for incorporating the video data into the received video data outputted from the AV decoder <b>4</b>.

P-0023[0023] A remote control transmitter <b>10</b> is a transmitter for sending out a command to a corresponding broadcasting receiver <b>30</b>. When a key (not shown) provided in the remote control transmitter <b>10</b> is operated, signal light (a remote control signal) meaning a command corresponding to the key is sent out from a light emitter (not shown). A remote control light receiver <b>11</b> receives the signal light, converts the signal light into an electric signal, and feeds the electric signal to the CPU <b>13</b>.

P-0024[0024] A nonvolatile memory (e.g., an EEPROM (Electrically Erasable and Programmable ROM)) <b>14</b> stores program information (the time when a program begins, a time period during which the program is continued, a channel number, etc.), information set by the user, and so forth.

P-0025[0025] The IC card <b>21</b>A stores key information for making it possible to view paid broadcasting and purchase historical information related to PPV (Pay Per View) programs for which the user is to be charged for each of the programs. A CA module <b>21</b> performs write processing and readout processing of the information between the CPU <b>13</b> and the IC card <b>21</b>A. The information include preview information (information related to a preview period and information related to a period during which purchase is possible) making it possible to view the pay program which has not been purchased yet only for a predetermined time period (time) in addition to key information, which is required to view the paid digital broadcasting, a purchase command, and purchase historical information. The CPU <b>13</b> can judge how long the pay program selected by the user is continued until the preview is terminated by the information related to a preview period and information related to an elapsed time from a timer (not shown).

P-0026[0026] A modem <b>22</b> is operated under the control of the CPU <b>13</b> in dial-up connection in cases such as a case where charge information is periodically transmitted.

P-0027[0027] The CPU <b>13</b> performs processing such as channel selection by the user using the remote control transmitter <b>10</b> or the like. As the processing according to the present invention, processing related to the purchase of the PPV program is performed. The contents of the processing will be described on the basis of a flow chart shown in FIG. 2. First, program-related information related to a program which is currently tuned in to is taken out of the memory <b>14</b> (step S), it is judged whether or not the program is a PPV program (step S<b>2</b>), it is judged whether or not the program has already been purchased if the program is a PPV program (step S<b>3</b>), and it is judged whether or not the program is being previewed if the program has not been purchased yet (step S<b>4</b>). When the preview is terminated, a purchase operation is immediately performed if an instruction to purchase the program is issued (steps S<b>12</b>, S<b>10</b>, and S<b>11</b>). On the other hand, if the program is being previewed, a predetermined message (see FIG. 3), together with received video, is displayed (step S<b>5</b>), and it is judged whether or not the instruction to purchase the program is issued (step S<b>6</b>). In this case, the purchase operation is not immediately performed even if the instruction to purchase the program is issued, but is waited for immediately before the preview is terminated (step S<b>7</b>). Immediately before the preview is terminated, it is judged whether or not the receiving condition is within an allowable range (step S<b>8</b>). The judgment is made on the basis of the C/N rate and the error rate which are outputted from the tuner <b>2</b>. Unless the receiving condition is within the allowable range, the purchase operation is not performed, to display a message saying “the program is not purchased because the receiving condition is bad” (step S<b>9</b>). On the other hand, if the receiving condition is within the allowable range, the purchase operation is performed (step S<b>10</b>, step S<b>11</b>).

P-0028[0028] Although in the foregoing description, a case where CS digital broadcasting is received is exemplified, the present invention is also applicable to a case where a PPV program is broadcast in BS digital broadcasting. In BS digital broadcasting, rainfall correspondence broadcasting using hierarchical modulation can be performed. In view of such a case, however, it is desirable to cause the user to previously determine whether or not a program is purchased even in the condition of low hierarchical broadcasting. For example, a purchase determination menu is prepared on a menu screen, the user is caused to previously determine whether or not a program is purchased by a remote control operation, and the receiver performs purchase/non-purchase processing in accordance with the determination.

P-0029[0029] As described in the foregoing, according to the present invention, even if the broadcasting cannot be viewed due to power failure or a sudden change in weather after a purchase operation of a pay program is performed by a user, if this phenomenon arises during a charge-free viewing time period, the effect of preventing situations where a charge for purchase is forced to be paid even though the purchased pay program cannot be viewed is produced because pay program purchase processing has not been performed yet.