JP2007329847A - Receiver and its program selection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To excellently select a program while suppressing a circuit scale and costs. <P>SOLUTION: One-segment reception parts 106-1 to 106-9 respectively receive the broadcasting of a low resolution executed in one segment allocated to a partial reception hierarchy. A full-segment reception part 108 receives the high vision broadcasting of a high resolution executed in remaining 12 segments excluding 1 segment allocated to the partial reception hierarchy. When selecting a channel (program), multiple images including the image by image signals from the one-segment reception parts 106-1 to 106-9 are displayed at a display part 110. When a prescribed channel is selected on the basis of the multiple images by a user operation, the prescribed channel is set as a reception channel to the full-segment reception part, and a full-segment image is displayed at the display part 110. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a receiving apparatus suitable for application to, for example, a receiver for digital terrestrial broadcasting and a program selection method thereof.

  Specifically, the present invention includes a first receiving unit that receives a high-resolution digital image signal and a plurality of second receiving units that receive a low-resolution digital image signal, and a plurality of second receiving units. The user can select a predetermined program based on the multi-screen based on the digital image signals of the different programs received in step 1, and the first receiver receives a high-resolution digital image signal corresponding to the selected program. Therefore, the present invention relates to a receiving apparatus and the like that can perform program selection satisfactorily while suppressing the circuit scale and cost.

  As a transmission system for terrestrial digital broadcasting, ISDB-T (Integrated Services Digital Broadcasting for Terrestrial) using OFDM technology is standardized by ARIB (Association of Radio Industries and Business).

  The OFDM modulation method is a kind of multi-carrier modulation method, in which encoded data (information symbols) obtained by serial-parallel conversion is assigned to a number of carriers orthogonal to each other between adjacent ones, and an Invert Fast Fourier Transform (IFFT) is assigned. ), The signals are collectively modulated into a signal in the time domain, and then an OFDM signal is generated and transmitted by orthogonal modulation.

  In addition, since the OFDM modulation method is a multi-carrier modulation method, the modulation method can be set for each carrier. In ISDB-T, DQPSK, QPSK, 16QAM, and 64QAM are assigned according to the transmission bit rate. Is possible.

  Further, ISDB-T adopts a method (segment structure) in which the 6M frequency band of the UHF band is divided into bands called 13 segments, and a modulation method can be set for each segment, with a maximum of three layers. The hierarchical modulation can be performed.

  A typical style of television viewing by the user is not so-called clear program-designated channel selection, but so-called zapping viewing, in which an interesting program is selected while appropriately switching the currently broadcast program.

  This zapping viewing is not efficient in the above-mentioned digital terrestrial broadcast receiving apparatus. That is, in terrestrial digital broadcasting, data is encrypted to prevent unauthorized copying, and communication with a B-CAS (BS-Conditional Access Systems) card is required to decrypt this data. It takes several seconds to complete.

Conventionally, such a zapping viewing program selection, as disclosed in Patent Document 1, for example, displays a plurality of images related to receivable programs of each channel in a multi-screen on the same screen, and the user displays the displayed image. It is known to do with reference to.
JP 2005-167712 A

  When the method of selecting a program based on multi-screen display as disclosed in Patent Document 1 is applied to the above-described digital terrestrial broadcast receiving apparatus, for example, by sequentially switching the reception channel of one receiving unit, An image of each possible channel can be obtained. However, in this case, since the time required for channel switching takes about several seconds as described above, the image of the program of each channel cannot be quickly reflected in the multi-screen, and the program selection cannot be performed satisfactorily. This problem can be solved by preparing as many receivers as the number of images in the multi-screen. However, in this case, even if the circuit scale of the entire apparatus is increased, the cost is greatly increased.

  An object of the present invention is to enable a program selection to be performed satisfactorily while suppressing a circuit scale and cost.

The concept of this invention is
A first receiver for receiving a first digital image signal relating to an image of a first resolution;
A plurality of second receiving units for receiving a second digital image signal related to an image having a second resolution lower than the first resolution;
A multi-screen digital image for displaying all or part of the second digital image signal of each different program received by the plurality of second receiving units on the same screen. A multi-screen generator for generating signals;
A switch unit that selectively outputs the digital image signal for multi-screen generated by the multi-screen generation unit or the first digital image signal received by the first receiving unit;
A user operation unit for a user to select a predetermined program based on a plurality of images displayed on the same screen in a state in which the multi-screen digital image signal is output from the switch unit;
When the predetermined program is selected by the user operation unit, the first receiving unit is controlled to receive the first digital image signal corresponding to the predetermined program, and the switch unit is And a control unit that controls to output the first digital image signal.

  In the present invention, in addition to the first receiving unit that receives the first digital image signal of high resolution (first resolution), the second digital image signal of low resolution (second resolution) is received. A plurality of second receiving units are provided. In the case of handling terrestrial digital broadcasting, for example, the second receiving unit is composed of a receiver in a mode in which frequency interleaving is performed in one segment (OFDM segment) in the center, and the first receiving unit is frequency interleaved. Consists of a receiver in a mode that performs all of the remaining segments.

  The plurality of second receiving units receive second digital image signals of different programs. Then, using all or a part of the plurality of received second digital image signals, a multi-screen digital image signal for displaying an image based on them on the same screen is generated. When the user performs a program selection operation, the digital image signal for multi-screen is selectively output. As a result, a multi-screen is displayed on the display unit.

  Here, when only a part of the second digital image signal obtained by the plurality of second receiving units is used for multi-screen generation, the range of the second digital image signal included in the part can be changed. Good. As a result, it is possible to avoid a reduction in the screen size by reducing the number of images displayed on the multi-screen, and by changing the range of the second digital image signal, images of many programs can be displayed on the multi-screen. It can be displayed easily and the efficiency of the program selection operation by the user can be improved.

  When a predetermined program is selected based on the multi-screen by a user operation, the first receiver receives a first digital image signal corresponding to the predetermined program. Here, the first digital image signal is transmitted through the same path as the second digital image signal or through a different path from the second digital image signal.

  For example, for terrestrial digital broadcasting, the digital image signal obtained from one central OFDM segment is the second digital image signal, and the digital image signals obtained from all the remaining OFDM segments are the first digital image signal. The first and second digital image signals are sent through the same path.

  When the first digital image signal corresponding to the predetermined program is received by the first receiving unit in this way, the first digital image signal is output instead of the above-described multi-screen digital image signal. As a result, an image of a predetermined program based on the first digital image signal is displayed on the display unit.

  As described above, in order to obtain a multi-screen for program selection, it includes a plurality of second receiving units that receive a low-resolution digital image signal. For example, it includes only one first receiving unit, Compared with the one that obtains an image of each program by sequentially switching the reception of a plurality of programs in the first receiving unit, the image change of each program can be quickly reflected in the multi-screen, and the user can select a program. It can be done well. This effect is obtained when the first digital image signal received by the first receiving unit is encrypted and the second digital image signal received by the second receiving unit is not encrypted. It will be even more emphasized.

  In addition, in order to obtain a multi-screen for selecting a program, the apparatus includes a plurality of second receiving units that receive a low-resolution digital image signal, and has a circuit compared to a unit that includes a plurality of first receiving units. The scale is small and it can be configured at low cost.

  Note that after a predetermined program is selected based on the multi-screen by a user operation, the first receiver is set to receive a second digital image signal corresponding to the selected program. Until the first digital image signal corresponding to the program can be output from the first receiver, the second digital image signal corresponding to the program received by the second receiver is subjected to the pixel number increasing process. May be output. Thereby, although the image quality is lowered, the image of the selected program can be quickly presented to the user in full size.

  According to this invention, the first receiving unit that receives the high-resolution digital image signal and the plurality of second receiving units that receive the low-resolution digital image signal are provided. The user can select a predetermined program based on the multi-screens of the received digital image signals of different programs, and then the first receiving unit receives a high-resolution digital image signal corresponding to the selected program. The program can be selected satisfactorily while suppressing the circuit scale and cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration of a receiving apparatus 100 as an embodiment. This receiving apparatus 100 is compatible with terrestrial digital broadcasting.

  The receiving apparatus 100 includes a microcomputer and includes a control unit 101 that controls the operation of the entire apparatus. The control unit 101 is connected to a remote control receiving unit 102 that receives an operation signal (for example, an infrared signal) output from a remote controller (hereinafter referred to as “remote control”) 102, and further a nonvolatile memory 103.

  In addition, receiving apparatus 100 includes terrestrial digital broadcast receiving antenna 105, a plurality of nine one-seg receiving units 106-1 to 106-9 in this embodiment, multi-screen generating unit 107, and full-seg receiving unit. 108, a changeover switch 109 constituting a switch unit, and a display unit 110.

  As is well known, in terrestrial digital broadcasting, one channel is allocated to a bandwidth of 6 MHz, 429 kHz is allocated as a guard band in the 6 MHz band, and the remaining bandwidth is divided into 13 segments (OFDM segments). Broadcast by the OFDM (Orthogonal Frequency Division Multiplexing) system.

  As shown in FIG. 2, among the 13 segments, one segment in the center is assigned to the partial reception layer for portable receivers. One segment assigned to this partial reception layer is frequency interleaved only within this segment. For example, high-definition (HDTV) broadcasting can be performed in the remaining 12 segments.

  In this embodiment, in order to simplify the explanation, in each channel, high-definition broadcasting is performed on 12 segments excluding one segment allocated to the partial reception layer, and the program content and partial reception of this high-definition broadcasting are performed. It is assumed that the program content of the broadcast performed in one segment assigned to the hierarchy is coincident (simultaneous broadcasting).

  Each of the one-segment receiving units 106-1 to 106-9 receives a low-resolution (320 × 180 pixel) broadcast performed in one segment assigned to the partial reception layer described above. That is, each of these one-seg receiving units 106-1 to 106-9 constitutes a receiver in a mode in which frequency interleaving is performed in one segment at the center. Note that the low-resolution digital image signal (second digital image signal) sent in this low-resolution broadcast is not encrypted.

  The full segment receiving unit 108 receives a high-definition broadcast of high resolution (1920 × 1080 pixels) performed in the remaining 12 segments excluding one segment allocated to the partial reception layer described above. That is, the full segment receiving unit 108 is composed of a receiver in a mode in which frequency interleaving is performed in the remaining 12 segments. Note that the high-resolution digital image signal (first digital image signal) transmitted in the high-resolution high-definition broadcast is encrypted. For this reason, when the full-segment receiver 108 switches the reception channel, communication with the B-CAS card is required for decoding. Therefore, it takes several seconds until the digital image signal of the channel after switching is obtained. It takes a degree.

The multi-screen generating unit 107 is a multi-screen digital image for displaying images based on these image signals on the same screen based on the low-resolution digital image signals respectively received by the one-segment receiving units 106-1 to 106-9. A signal _SMT is generated. Here, when nine images constituting a multi-screen are arranged in a 3 × 3 matrix, if the number of pixels is not converted, the horizontal direction is 960 (= 320 × 3) pixels, and the vertical direction is 540. (= 180 × 3) pixels, both horizontal and vertical, which are half the number of pixels in high-definition broadcasting. Therefore, the multi-screen generation unit 107 may increase the size of each image on the multi-screen by performing a process of increasing the number of pixels of the nine images.

Changeover switch 109 outputs the high-resolution digital image signal S _FL received by the multi-multi-screen digital image signals generated by the screen generating unit 107 S _MT or full-segment receiving section 108 selectively. The fixed terminal on the a side of the changeover switch 109 is connected to the output side of the multi-screen generating unit 107, and the fixed terminal on the b side of the changeover switch 109 is connected to the output side of the full segment receiving unit 108. The changeover switch 109, when displaying a multi-screen by the multi-screen digital image signal S _MT on the display unit 110 is connected to a side, in the case of displaying an image with a high resolution digital image signal S _FL b side Connected to.

  The display unit 110 is configured using an image display element such as an LCD (Liquid Crystal Display) or a PDP (Plasma Display Pane). The display unit 110 displays an image based on a digital image signal output from the changeover switch 109.

  The operation of the receiving apparatus 100 shown in FIG. 1 will be described.

  First, a setup process (setup process) in which the control unit 101 grasps receivable channels will be described with reference to the flowchart of FIG. The control unit 101 starts this setup process when the user instructs setup using the remote controller 102.

  In step ST1, the process is started, and in step ST2, the channel number CHNO is set to 13, and the reception channel of the full segment reception unit 108 is set to the channel “13”. In step ST3, it is determined whether a broadcast signal has been received. When a broadcast signal is received, in step ST4, an NIT (Network Information Table) is acquired from the broadcast signal, and a service ID (service_id) indicating the type of broadcast service is acquired from the NIT, and step ST5. Thus, the service ID is stored in the non-volatile memory 104 in association with the received channel.

  Next, in step ST6, it is determined whether or not the channel number CHNO is 62. When CHNO = 62, it means that all the reception channels are set in the full-seg receiving unit 108 and the process is performed. Therefore, the process ends in step ST7.

  On the other hand, when CHNO = 62, the channel number CHNO is incremented by 1 in step ST8, and then the process returns to step ST3, the next reception channel is set in the full segment reception unit 108, and the same processing as described above is performed. .

  When the control unit 101 performs the setup process as described above, the receivable channel is associated with the service ID. FIG. 4 shows an example of correspondence between receivable channels and service IDs stored in the nonvolatile memory 104. In FIG. 4, the channel associated with the service ID is a receivable channel. The frequency indicates the reception frequency of each channel.

  Next, the program selection process of the control unit 101 will be described with reference to the flowchart of FIG. The control unit 101 starts the program selection process, for example, when the power is turned on.

  In step ST11, the process is started, and in step ST12, control is performed so that the one-segment multi-screen is displayed on the display unit 110. In this case, different channels selected from the receivable channels identified in the above-described setup process are set as reception channels in the one-segment reception units 106-1 to 106-9.

  The channels set in the one-segment receivers 106-1 to 106-9 can be changed by a user operation as will be described later, but are initially mechanically allocated by the controller 101. When the number of receivable channels is less than nine, only the number of one-seg receiving units corresponding to the number of receivable channels among the one-seg receiving units 106-1 to 106-9 is used.

Each of the one-segment receivers 106-1 to 106-9 acquires a low-resolution digital image signal from the digital broadcast signal of the reception channel. These low-resolution digital image signals are supplied to the multi-screen generation unit 107. The multi-screen generating unit 107 uses a multi-screen for displaying images based on the nine low-resolution digital image signals supplied from the one-segment receiving units 106-1 to 106-9 on the same screen. A digital image signal _SMT is generated.

The changeover switch 109 is connected to the a side. Therefore, the multi-screen digital image signal _SMT generated by the multi-screen generation unit 107 is supplied to the display unit 110 via the a side of the changeover switch 109. As a result, a multi-screen (one-segment multi-screen) including nine images is displayed on the display unit 110. FIG. 6A shows an example of a one-segment multi-screen.

  Although not shown in FIG. 6A, the channel number corresponding to each image and the type of broadcast service corresponding to the service ID are displayed in a superimpose manner to facilitate the user's program selection. May be.

  Returning to FIG. 5, after the process of step ST12, it is determined in step ST13 whether or not the user has requested to change the reception channel set in the one-segment receivers 106-1 to 106-9 by remote control operation. To do. When the user requests to change the reception channel, the process proceeds to the reception channel change process by the user in step ST14.

When there is a request to change the reception channel by the user, a list of receivable channels may be superimposed on the multi-screen. In this case, the superimpose display signal is generated in the control unit 101 or in the multi-screen generation unit 107 under the control of the control unit 101, and is combined with the multi-screen image signal _SMT .

  After the reception channel changing process is performed by the user in step ST14, the reception channels of the one-seg receiving units 106-1 to 106-9 are set to changed channels in step ST15. Thereafter, the process returns to step ST12, and control is performed so that the one-segment multi-screen is displayed on the display unit 110 as described above. In this case, the one-seg multi-screen displayed on the display unit 110 reflects the change of the reception channel of the one-seg receiving units 106-1 to 106-9 by the user.

  If there is no request to change the reception channel by the user in step ST13, it is determined in step ST16 whether or not a full segment reception channel, that is, a channel (program) to be received by the full segment reception unit 108 is selected. The user can achieve this channel selection, for example, by moving an image selection cursor CA as shown in FIG. 6A to a desired image position by remote control operation and then performing a confirmation operation.

  When the full segment reception channel is not selected in step ST16, the process returns to step ST12. On the other hand, when the full-segment reception channel is selected, the process proceeds to step ST17. In this step ST17, the reception channel of the full segment receiving unit 108 is set to the channel selected in step ST16.

In step ST18, the display unit 110 is controlled to display the full segment screen. In this case, the changeover switch 109 is connected to the b side. Therefore, the high-resolution digital image signal _SFL obtained by the full segment receiving unit 108 and relating to the channel (program) selected by the user is supplied to the display unit 110 via the b side of the changeover switch 109. Thereby, a full segment screen is displayed on the display unit 110. FIG. 6B shows an example of the full-segment screen of the reception channel selected on the one-segment multi-screen of FIG. 6A.

  After the process of step 18, in step ST19, it is determined whether or not the user has requested a one-segment multi-screen display by remote control operation. When the user does not request the one-segment multi-screen display, the process returns to step ST18 and the display state of the full-segment screen is continued.

  When the user is requesting the one-segment multi-screen display, the process returns to step ST12 and, as described above, control is performed so that the one-segment multi-screen is displayed. Accordingly, the one-segment multi-screen is displayed again on the display unit 110, and the user's channel (program) selection using the multi-screen can be performed.

  As described above, the receiving apparatus 100 shown in FIG. 1 includes the one-seg receiving units 106-1 to 106-9 that receive low-resolution digital image signals in order to obtain a multi-screen for channel (program) selection. For example, a single full-seg receiving unit 108 is provided, and the full-seg receiving unit 108 multi-changes the image change of each channel as compared with the case of obtaining an image of each channel by sequentially switching reception of a plurality of channels. This can be quickly reflected in the screen, and the user can make a good channel (program) selection.

  In particular, the high-resolution digital image signal received by the full-seg receiving unit 108 is encrypted, and the full-seg receiving unit 108 takes about several seconds to obtain the digital image signal of the channel after channel switching. It is even more emphasized.

  In addition, the receiving apparatus 100 shown in FIG. 1 includes one-segment receiving units 106-1 to 106-9 that receive low-resolution digital image signals in order to obtain a multi-screen for channel (program) selection. For example, the circuit scale is small and can be configured at a low cost as compared with a configuration including a plurality of full-segment receivers 108.

  Next, another embodiment of the present invention will be described. FIG. 7 shows the configuration of a receiving apparatus 100A as another embodiment. 7, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.

  1 includes nine one-seg receiving units 106-1 to 106-9, and the nine one-seg receiving units 106-1 to 106-9 are displayed on a multi-screen. Nine images based on the obtained low-resolution digital image signal are included (see FIG. 6A).

  The receiving apparatus 100A illustrated in FIG. 7 includes six one-seg receiving units 106-10 to 106-15 in addition to the nine one-seg receiving units 106-1 to 106-9. These one-seg receiving units 106-10 to 106-15 also have a low resolution (320 × 180 pixels) performed in one segment assigned to the partial reception layer described above, similarly to the one-seg receiving units 106-1 to 106-9. Receive broadcasts.

  In the one-segment receiving units 106-1 to 106-15, different channels selected from the receivable channels grasped by the above-described setup process are set as reception channels. The channels set in the one-segment receivers 106-1 to 106-15 can be changed by a user operation (see ST13 and ST14 in FIG. 5), but are initially mechanically allocated by the controller 101.

Each of the one-segment receiving units 106-1 to 106-15 acquires a low-resolution digital image signal from the digital broadcast signal of the reception channel. These low resolution digital image signals are supplied to the multi-screen generation unit 107A. In the multi-screen generation unit 107A, based on nine low-resolution digital image signals among the 15 low-resolution digital image signals supplied from the one-segment reception units 106-1 to 106-15, an image based on these image signals is displayed. _Are generated on the same screen, a multi-screen digital image signal _SMT is generated. This multi-screen digital image signal _SMT is supplied to the a side of the changeover switch 109.

Here, the range of nine low-resolution digital signals for generating the multi-screen digital image signal _SMT can be changed by a user's remote control operation. In this embodiment, nine low-resolution digital signals are used as image signals from the one-segment receivers 106-1 to 106-9, and nine low-resolution digital signals are transmitted from the one-seg receivers 106-1 to 106-1. 106-6, 106-10 to 106-12 in the second state, or nine low-resolution digital signals from the one-segment receivers 106-4 to 106-9 and 106-13 to 106-15. Can be changed to the third state.

  Other configurations of the receiving apparatus 100A are the same as those of the receiving apparatus 100 shown in FIG. Then, although detailed description is omitted, the setup process and the channel (program) selection process in the receiving apparatus 100A are also performed in the same manner as the receiving apparatus 100 shown in FIG. 1 (see FIGS. 3 and 5).

  In the channel (program) selection process, the image included in the multi-screen (one-segment multi-screen) displayed on the display unit 110 is changed in accordance with the change in the range of the nine low-resolution digital signals by the user's remote control operation described above. Is done.

  FIG. 8 shows an example of changing the image included in the multi-screen. In FIG. 8, the numbers “1” to “15” attached to the images indicate images based on the image signals from the one-segment receivers 106-1 to 106-15, respectively.

When the range of the nine low-resolution digital signals for generating the multi-screen digital image signal _SMT by the user operation is the first state described above, the display unit 110 has nine images in the range b. A multi-screen that contains is displayed. When the range is in the second state described above, the display unit 110 displays a multi-screen including nine images in the range a. Further, when the range is in the third state described above, a multi-screen including nine images in the range c is displayed on the display unit 110.

  In the channel (program) selection processing, as described above, the channel selection processing is performed by moving one of the images included in the multi-screen displayed on the display unit 110 and selecting the image by moving the image selection cursor CA. Done. Therefore, the channel selection range is also changed by changing the image range included in the multi-screen displayed on the display unit 110 as described above.

  The receiving device 100A shown in FIG. 7 has the same effect as the receiving device 100 shown in FIG. Further, according to the receiving apparatus 100 shown in FIG. 7, the range of nine images reflected on the multi-screen can be easily changed without changing the setting of the receiving channel of the one-segment receiving units 106-1 to 106-15. Therefore, the images of many programs can be easily displayed on the multi-screen, and the efficiency of the program selection operation by the user can be improved.

  Although FIG. 8 shows an example in which the image included in the multi-screen is shifted in the horizontal direction, the image may be shifted in the vertical direction. Further, by providing more one-segment receivers, it is possible to perform a multistage shift. In the above description, the multi-screen includes nine images fixedly, but the number of images included in the multi-screen can be changed to, for example, nine, twelve, fifteen, etc. by user operation. It is good.

  Note that the high-resolution digital image signal acquired by the full-seg receiving unit 108 is encrypted, and it takes several seconds until the digital image signal of the channel is actually obtained after the reception channel is set in the full-seg receiving unit 108. It takes a degree. Therefore, in the channel (program) selection process of FIG. 5, it takes time until the full segment screen is displayed on the display unit 110 in step ST18 after the reception channel is set in the full segment reception unit 108 in step ST17. If the receiving channel is set at 108 and the selector switch 109 is switched to the b side at the same time, nothing is displayed on the display unit 110.

  Therefore, until the digital image signal of the channel is actually obtained after the reception channel is set in the full segment reception unit 108, an image based on the low-resolution digital image signal of the reception channel is displayed on the display unit 110. It may be.

  The flowchart of FIG. 9 shows channel (program) selection processing in that case. In FIG. 9, the steps corresponding to those in FIG.

  When a predetermined channel (program) is selected with the image selection cursor CA in a state where the one-segment multi-screen is displayed on the display unit 110 as shown in FIG. 10A in step ST16, the full-segment receiver 108 is displayed in step ST17. The predetermined channel is set as a reception channel.

  Next, in step ST20, control is performed so that the one-segment enlarged screen is displayed on the display unit 110. In this case, the multi-screen generation unit 107 (107A) in FIG. 1 (FIG. 7) performs the pixel number increasing process on the low-resolution digital signal of the predetermined channel to generate an enlarged image signal. 109 is supplied to the display unit 110 via the a side. As a result, a one-segment enlarged screen is displayed on the display unit 110 as shown in FIG. 10B.

Here, since the low-resolution digital image signal obtained by the one-seg receiving unit is 320 × 180 pixels, in the image enlargement process in the multi-screen generation unit 107 (107A), the number of pixels is 1920 × 1080 pixels by linear interpolation or the like. The enlarged image signal corresponding to the high-resolution digital video signal _SFL obtained by the full-segment receiver 108 is generated. At this time, the multi-screen generation unit 107 (107A) constitutes an image enlargement unit.

Next, in step ST21, it is determined whether or not the full-segment screen can be displayed, that is, whether or not the high-resolution digital image signal _{SFL of} the reception channel set from the full-segment receiver 108 has been obtained. . When the full segment screen can be displayed, the process proceeds to step ST18, and the display unit 110 is controlled to display the full segment screen as shown in FIG. 10C. In this case, the changeover switch 109 is connected to the b side. Therefore, the high-resolution digital image signal _SFL obtained by the full segment receiving unit 108 and relating to the channel (program) selected by the user is supplied to the display unit 110 via the b side of the changeover switch 109. Thereby, a full segment screen is displayed on the display unit 110.

  As described above, the image based on the low-resolution digital image signal of the reception channel is displayed on the display unit 110 after the reception channel is set in the full segment reception unit 108 until the digital image signal of the channel is actually obtained. By displaying the image, the image of the selected channel (program) can be quickly presented to the user in full size, although the image quality deteriorates.

  In the above-described embodiment, the present invention is applied to the terrestrial digital broadcast receivers 100 and 100A, and the low resolution digital image signal has the same path (terrestrial digital broadcast signal) as the high resolution digital image signal. Although what is received is shown, the present invention can be similarly applied to a case where the low resolution digital image signal is received via a different path from the high resolution digital image signal, for example, the Internet.

  The present invention can favorably select a program while suppressing the circuit scale and cost, and can be applied to, for example, a terrestrial digital broadcast receiver.

It is a block diagram which shows the structure of the receiver as embodiment. It is a figure which shows the segment (OFDM segment) for 1 channel in terrestrial digital broadcasting. It is a flowchart which shows the procedure of a setup process. It is a figure for demonstrating acquisition of the service ID at the time of setup. It is a flowchart which shows the procedure of a channel (program) selection process. It is a figure which shows an example of the one segment multi-screen and full segment screen in a channel (program) selection process. It is a flowchart which shows the structure of the receiver as other embodiment. It is a figure which shows the example of a change of the image contained in a multiscreen. It is a flowchart which shows the other procedure of a channel (program) selection process. It is a figure which shows an example of the one seg multi-screen, the one seg expansion screen, and the full seg screen in a channel (program) selection process.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100,100A ... Reception apparatus, 101 ... Control part, 102 ... Remote controller, 103 ... Remote control reception part, 104 ... Non-volatile memory, 105 ... Receiving antenna, 106-1 ~ 106-15 ··· One-segment receiver, 107, 107A ··· Multi-screen generator, ···································································

Claims (6)

A first receiver for receiving a first digital image signal relating to an image of a first resolution;
A plurality of second receiving units for receiving a second digital image signal related to an image having a second resolution lower than the first resolution;
A multi-screen digital image for displaying all or part of the second digital image signal of each different program received by the plurality of second receiving units on the same screen. A multi-screen generator for generating signals;
A switch unit that selectively outputs the digital image signal for multi-screen generated by the multi-screen generation unit or the first digital image signal received by the first receiving unit;
A user operation unit for a user to select a predetermined program based on a plurality of images displayed on the same screen in a state in which the multi-screen digital image signal is output from the switch unit;
When the predetermined program is selected by the user operation unit, the first receiving unit is controlled to receive the first digital image signal corresponding to the predetermined program, and the switch unit is And a control unit that controls to output the first digital image signal. The first digital image signal received by the first receiving unit is encrypted, and the second digital image signal received by the second receiving unit is not encrypted. The receiving device according to claim 1. The first digital image signal received by the first receiving unit and the second digital image signal received by the second receiving unit are transmitted through the same path. The receiving device described in 1. When the predetermined program is selected by the user operation unit, the second digital image signal corresponding to the predetermined program is subjected to a pixel number increasing process and received by the first receiving unit. An image enlarging unit that generates an enlarged image signal corresponding to one digital image signal;
When the predetermined program is selected by the user operation unit, the control unit is configured to enable the first receiving unit to output the first digital image signal corresponding to the predetermined program. The receiving apparatus according to claim 1, wherein control is performed so that an enlarged image signal generated by the image enlargement unit is output from the switch unit. The receiving apparatus according to claim 1, further comprising a range changing unit that changes a range of the second digital image signal included in the part of the multi-screen generation. A first receiver for receiving a first digital image signal relating to an image of a first resolution;
A program selection method for a receiving apparatus comprising: a plurality of second receiving units that receive a second digital image signal related to an image having a second resolution lower than the first resolution,
A first receiving step of receiving a second digital image signal of a different program at each of the plurality of second receiving units;
A first display step of displaying all or a part of the plurality of second digital image signals received in the first reception step on the same screen using all or a part of the plurality of second digital image signals;
A program selection step of selecting a predetermined program from a plurality of images displayed on the same screen in the first display step;
A second receiving step in which the first receiving unit receives the first digital image signal corresponding to the program selected in the program selecting step;
A program selection method for a receiving apparatus, comprising: a second display step for displaying an image based on the first digital image signal received in the second reception step.

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