JP2005027071A - Digital/analog broadcast signal receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital analog receiver provided with a seamless CH selection and a high-definition OSD which prevent viewers from becoming aware of digital and analog programs. <P>SOLUTION: A whole CH managing part 23 for managing all digital and analog channel numbers by using a digital-side CPU 11 is added, and the channel number of a TV program and information on a main sound, a secondary sound, or the like are displayed on a TV screen with a common OSD. The digital-side CPU 11 instructs an analog-side CPU 15 even to select an analog channel, and the analog-side CPU 15 switches the control line of a digital analog tuner. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital analog broadcast receiving apparatus that switches between digital broadcast and analog broadcast for reception.
[0002]
[Prior art]
In recent years, digital broadcasting has begun worldwide, and development of digital analog broadcast receiving apparatuses capable of receiving not only conventional analog broadcasting but also digital broadcasting is progressing.
[0003]
FIG. 7 is a block diagram of a conventional digital analog broadcast receiving apparatus. 1 is an antenna, 2 is a distributor, 3 is a digital tuner, 4 is an analog tuner, 5 is an analog video processing unit, 6 is a DEMUX, and 7 is a video. Decoder, 8 is a digital tuner control line, 9 is an analog control line, 10 is a digital OSD, 11 is a digital CPU, 12 is an analog OSD, 13 is a switching circuit, 14 is an inter-CPU control line, and 15 is an analog CPU. , 16 is a remote control light receiver, and 17 is a remote control transmission device (see, for example, Patent Document 1).
[0004]
Next, the operation of the conventional digital analog broadcast receiving apparatus will be described with reference to FIG. The analog side CPU 15 is in charge of stationed judgment processing by the analog tuner 4, and the digital CPU 11 is in charge of stationed judgment processing by the digital tuner 3. If the analog tuner 15 determines that there is no station, the analog CPU 15 instructs the digital CPU to start the station determination processing for the same channel. In response to this instruction, the digital tuner 3 starts the station determination process. If the channel is a digital broadcast, it is determined that the channel is a station. Therefore, even if the selected channel is an analog broadcast, it is automatically determined. Channel settings.
[0005]
First, assume that a digital broadcast is received. The TV viewer selects a desired digital broadcast program with the remote control transmitter 17, and the CH number of the TV program desired by the TV viewer is analogized via the remote control receiver 16 in the digital analog broadcast receiver. The analog CPU side CPU 15 transmits this CH number to the digital tuner 3. In this example, the remote control light receiver 16 is connected to the analog side CPU 15, but the remote control light receiver 16 may be connected to the digital side CPU 11 as long as there is a mechanism capable of exchanging CH information. The digital broadcast reaches the digital tuner 3 and the analog tuner 4 via the antenna 1 and the distributor 2. The analog side CPU 15 checks the state of the analog tuner 4, determines that it is not an analog broadcast, and stops the subsequent analog processing from the analog video processing unit 5.
[0006]
On the other hand, the digital-side CPU 11 checks the state of the digital tuner 3, determines that it is a digital broadcast, instructs the DEMUX 6 to extract a digital packet, and instructs the video decoder 7 to execute a digital broadcast video reproduction process. The digital OSD 10 superimposes and displays the CH number of the TV program, the title name, information on whether the main audio or sub audio, etc. on the TV screen.
[0007]
Next, it is assumed that an analog broadcast is received. In this case, the digital-side CPU 11 checks the state of the digital tuner 3, determines that it is not digital broadcasting, and stops the digital processing subsequent to the DEMUX 6. On the other hand, the analog side CPU 15 checks the state of the analog tuner 4 and determines that it is an analog broadcast. The analog video processing unit 5 performs video playback processing, and the analog OSD 12 performs the TV program CH number, main audio or sub audio. Such information is superimposed on the TV screen and displayed.
[0008]
[Patent Document 1]
JP 2002-218334 A [0009]
[Problems to be solved by the invention]
However, in the conventional digital analog broadcast receiving apparatus, two tuners for analog and digital (about $ 5 for each tuner), a distributor (about $ 5), and two OSDs for analog broadcast and digital broadcast are used. There is also a problem of increased costs. In addition, there is a problem that the display position of the display image such as the color of the display image and the channel number in the analog OSD and the digital OSD is different, and the viewer feels the poor texture of the OSD when switching between analog and digital viewing. .
[0010]
Furthermore, when an operation such as frequent switching between analog and digital broadcasting is performed, one CPU hangs because the communication load between the two CPUs increases, and the other CPU There is a possibility that two CPUs become inoperable while waiting for a communication response, and that both analog broadcasting and digital broadcasting cannot be viewed.
[0011]
Also, when selecting digital and analog programs, viewers need to be aware of whether they are digital programs or analog broadcasts, and seamless tuning that does not make them aware of digital and analog has been impossible.
[0012]
[Means for Solving the Problems]
In order to solve the above problem, the present invention (Claim 1) includes a digital analog tuner that receives digital broadcast and analog broadcast, a first CPU, a second CPU, and a digital playback unit that converts the digital broadcast into visible information. In the digital analog broadcast receiving apparatus including an analog playback unit that converts analog broadcast into visible information, the first CPU converts the digital broadcast into visible information when the digital broadcast is determined to be stationed. Instructs the digital playback unit to notify the second CPU when it is determined that the analog broadcast is stationed, and the second CPU that has received this notification performs analog playback to convert the analog broadcast into visible information. This is an instruction to the department.
[0013]
Further, according to the present invention (Claim 2), in the digital analog broadcast receiving apparatus according to Claim 1, the first CPU converts the analog broadcast into visible information when it is determined that the analog broadcast is stationed. Is sent to the analog playback unit, and the second CPU is notified when it is determined that the digital broadcast is stationed. When the second CPU receives the notification, the conversion from the digital broadcast to the visible information is digitally performed. The playback unit is instructed.
[0014]
According to the present invention (Claim 3), a changeover switch for selecting either the first CPU or the second CPU is added to control the digital analog tuner, and the changeover switch is controlled from the first CPU. It is something that I will do.
[0015]
According to the present invention (Claim 4), a changeover switch for selecting either the first CPU or the second CPU is added to control the digital analog tuner, and the changeover switch is controlled from the first CPU. Is to do things.
[0016]
Further, the present invention (Claim 5) adds an all-CH management unit for storing frequency information of all programs of digital broadcasting and analog broadcasting, and the first CPU switches to the second CPU during auto scan. Is switched to the second CPU to instruct an analog auto scan, and the frequency information of the analog broadcast subjected to the auto scan is stored in the all-CH management unit. When the normal program is selected, the first CPU Obtains frequency information corresponding to a desired channel number from the CH management unit, sets the frequency to the digital analog tuner in the case of digital broadcasting, and sets the frequency to the second CPU in the case of analog broadcasting. And the second CPU sets the frequency to the digital analog tuner.
[0017]
In addition, the present invention (Claim 6) adds an OSD for displaying information such as analog and digital channel numbers, title names, and main audio or sub audio stored in all CH management sections as visible information. It is what I do.
[0018]
Further, according to the present invention (claims 7 and 8), when the first CPU hangs, the second CPU switches the direction of the changeover switch to the second CPU and sets the frequency for the digital analog tuner. Is to do.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
FIG. 1 is a diagram showing a digital analog broadcast receiving apparatus according to Embodiment 1 of the present invention. 1, the same reference numerals as those in FIG. 7 denote the same or corresponding parts. The difference from the conventional digital / analog broadcast receiving apparatus shown in FIG. 7 is that a distributor, a digital tuner and an analog tuner are replaced with a digital analog tuner 18, and a digital OSD and an analog OSD are replaced with a single OSD 10. The tuner 18 and the OSD 10 are changed to be controlled by the digital CPU 11.
[0020]
The operation of the digital analog broadcast receiving apparatus according to the first embodiment configured as described above will be described below.
[0021]
First, assume that a digital broadcast is received. In this case, the digital broadcast reaches the digital analog tuner 18 via the antenna 1 and the following processing is performed.
[0022]
(1) The digital CPU 11 checks the state of the digital analog tuner 18 and determines that it is digital broadcasting.
[0023]
(2) The digital CPU 11 informs the analog CPU 15 that it is a digital broadcast.
[0024]
(3) The analog side CPU 15 stops the subsequent analog processing from the analog video processing unit 5.
[0025]
(4) The digital-side CPU 11 instructs the DEMUX 6 to extract a digital packet, and instructs the video decoder 7 to execute a digital broadcast video reproduction process.
[0026]
(5) The OSD 10 superimposes and displays the TV program channel number, title name, main audio or sub audio information, and the like on the TV screen.
[0027]
Next, it is assumed that an analog broadcast is received. In this case, the analog broadcast reaches the digital analog tuner 18 via the antenna 1 and the following processing is performed.
[0028]
(6) The digital side CPU 11 checks the state of the digital analog tuner 18 and determines that it is analog broadcasting.
[0029]
(7) The digital CPU 11 informs the analog CPU 15 that it is an analog broadcast.
[0030]
(8) The digital CPU 11 stops the processing of the DEMUX 6 and the video decoder 7.
[0031]
(9) The analog side CPU 15 instructs the analog video processing unit 5 to perform video playback processing.
[0032]
(10) The OSD 10 superimposes and displays the channel number of the TV program, information about the main audio or sub audio, and the like on the TV screen.
[0033]
As described above, in the first embodiment of the present invention, the two tuners and distributors for analog and digital are replaced with a single digital analog tuner. Can be reduced by $ 5, and since it has a single OSD, the analog OSD and the digital OSD have different display positions such as the color of the display image, channel number, etc. It is possible to prevent the problem that the viewer feels the poor texture of the OSD when switching the viewing.
[0034]
(Embodiment 2)
FIG. 2 is a diagram showing a digital analog broadcast receiving apparatus according to Embodiment 2 of the present invention. 2, the same reference numerals as those in FIG. 1 denote the same or corresponding parts. The difference from the digital / analog broadcast receiving apparatus according to the first embodiment of the present invention is that in FIG. 1, the digital CPU 11 and the analog CPU 15 exchange control information on the bidirectional CPU control line 14, whereas FIG. 2, the master CPU 18 has made a change to control the slave CPU 12 with a unidirectional CPU control line, and has a changeover switch 19 for switching the CPU that controls the digital analog tuner 18. FIG. 5 is a diagram illustrating a state in which the tuner is controlled by the master CPU, and FIG. 6 is a diagram illustrating a state in which the tuner is controlled by the slave CPU.
[0035]
The operation of the digital analog broadcast receiving apparatus according to the second embodiment configured as described above will be described below.
[0036]
In the first embodiment of the present invention, since the digital CPU 11 and the analog CPU 15 communicate bidirectionally, if one CPU hangs, the other CPU waits for a communication response (ACK), and processing However, the problem that both the digital broadcast and the analog broadcast cannot be viewed has not been avoided, and the explanation will be given based on this avoidance point.
[0037]
First, assume that a digital broadcast is received. In this case, the digital broadcast reaches the digital analog tuner 18 via the antenna 1 and the following processing is performed.
[0038]
(1) The master side CPU 18 instructs the changeover switch 19 to switch the connection of the tuner control line with the digital analog tuner 18 to the master CPU 18 side. As shown in FIG. 5, the changeover switch 19 enables only the master CPU 18 to communicate with the digital analog tuner.
[0039]
(2) The master CPU 18 checks the state of the digital analog tuner 18 and determines that it is digital broadcasting.
[0040]
(3) The master side CPU 18 instructs the changeover switch 19 to switch the connection of the tuner control line with the digital analog tuner 18 to the slave CPU 12 side. As shown in FIG. 6, the changeover switch 19 enables only the slave CPU 12 to communicate with the digital analog tuner.
[0041]
(4) The master-side CPU 18 stops the subsequent analog processing from the analog video processing unit 5.
[0042]
(5) The slave CPU 12 instructs the DEMUX 6 to extract a digital packet, and instructs the video decoder 7 to execute a digital broadcast video reproduction process.
[0043]
(6) The OSD 10 superimposes and displays the TV program channel number, title name, main audio or sub audio information, and the like on the TV screen.
[0044]
Next, it is assumed that an analog broadcast is received. In this case, the analog broadcast reaches the digital analog tuner 18 via the antenna 1 and the following processing is performed.
[0045]
(7) The master side CPU 18 instructs the changeover switch 19 to switch the connection of the tuner control line with the digital analog tuner 18 to the master CPU 18 side.
[0046]
(8) The master CPU 18 checks the state of the digital analog tuner 18 and determines that it is analog broadcasting.
[0047]
(9) The master CPU 18 instructs the slave CPU 12 to stop digital processing.
[0048]
(10) The slave CPU 12 stops the processing of the DEMUX 6 and the video decoder 7.
[0049]
(11) The master CPU 18 instructs the analog video processing unit 5 to perform video playback processing.
[0050]
(12) The OSD 10 superimposes and displays the channel number of the TV program, information about the main audio or sub audio, and the like on the TV screen.
[0051]
Here, for example, consider a case where the slave CPU hangs. At this time, when viewing the digital broadcast, since the process (5) cannot be performed, the digital broadcast cannot be viewed, but since the master CPU 18 is operable, the process (11) is possible. Can be viewed. TV viewers are very uncomfortable when they cannot watch at all, but their dissatisfaction is drastically reduced when they can watch at least analog broadcasting.
[0052]
As described above, in the second embodiment of the present invention, the changeover switch for switching the CPU that controls the digital analog tuner and that the master CPU has changed the control of the slave CPU through the unidirectional CPU control line. Since it is provided, it is possible to avoid the problem that one of the CPUs cannot view both the digital broadcast and the analog broadcast when moving.
[0053]
(Embodiment 3)
FIG. 3 is a diagram showing a digital analog broadcast receiving apparatus according to Embodiment 3 of the present invention. 3, the same reference numerals as those in FIG. 2 denote the same or corresponding parts. In FIG. 2, the master CPU 18 performs slave CPU control and analog broadcast control, and the slave CPU 12 performs digital broadcast control. However, in FIG. The master digital CPU 21 performs slave analog CPU control and digital broadcast control, and the slave analog CPU performs analog broadcast control.
[0054]
The operation of the digital analog broadcast receiving apparatus according to the third embodiment configured as described above is the same as that of the present embodiment except that the master digital CPU 21 performs slave analog CPU control and digital broadcast control, and the slave analog CPU performs analog broadcast control. This is the same as the second embodiment.
[0055]
Here, for example, consider a case where the slave analog CPU 22 hangs. At this time, when viewing an analog broadcast, the analog broadcast cannot be played back because the analog broadcast cannot be played back. However, since the master digital CPU 21 can operate, the digital broadcast can be played back. , Can be viewed. TV viewers are very uncomfortable when they cannot watch at all, but their dissatisfaction is drastically reduced when they can watch at least digital broadcasting alone.
[0056]
As described above, in the third embodiment of the present invention, the master digital CPU has made a change to control the slave analog CPU through the unidirectional CPU control line, and switching for switching the CPU that controls the digital analog tuner. Since the switch is provided, it is possible to avoid the problem that one of the CPUs cannot view both the digital broadcast and the analog broadcast when moving.
[0057]
(Embodiment 4)
FIG. 4 is a diagram showing a digital analog broadcast receiving apparatus according to Embodiment 4 of the present invention. 4, the same reference numerals as those in FIG. 3 denote the same or corresponding parts. The difference from the digital / analog broadcast receiving apparatus according to the fourth embodiment of the present invention is that an all channel management unit 23 for managing all the digital and analog channel numbers by the digital CPU 11 is added, and the analog channel selection instruction is also digital. The side CPU 11 outputs to the analog side CPU 15 and the control line of the digital analog tuner is a point to be switched by the analog side CPU 15.
[0058]
The operation of the digital analog broadcast receiving apparatus according to the second embodiment configured as described above will be described below.
[0059]
First, it is necessary to install a digital / analog broadcast receiving apparatus, or to create a correspondence table between frequencies and CH numbers where digital and analog TV programs exist according to the following procedure, if necessary.
[0060]
(1) The digital CPU 11 instructs the analog CPU 15 to switch the changeover switch 19 to the analog CPU.
[0061]
(2) The analog CPU 15 performs auto scan and sends information on the analog CH number to the digital CPU 11 via the CPU control line 14.
[0062]
(3) The digital CPU 11 stores the analog CH information in the all CH management unit 23.
[0063]
(4) The digital CPU 11 instructs the analog CPU 15 to switch the changeover switch 19 to the digital CPU.
[0064]
(5) The digital CPU 11 performs auto scan, and stores the information of the digital CH number in the all CH management unit 23.
[0065]
In this way, information regarding all digital and analog channel numbers is stored in all the CH management units 23.
[0066]
For example, consider the case of performing channel up / down channel selection for broadcasting in which analog and digital channels are mixed.
[0067]
(6) The digital CPU 11 obtains the value of the frequency of the analog program from the CH information of the analog broadcast stored in the all CH management unit 23, and sends it to the analog CPU 15 via the inter-CPU control line 14. Directs analog tuning.
[0068]
(7) The analog side CPU 15 switches the switching control line 20 to the analog side and controls the digital analog tuner 18 to select an analog channel.
[0069]
(8) If an analog channel exists, the analog side CPU 15 notifies the digital side CPU 11 of this via the inter-CPU control line 14, and at the same time, is necessary for OSD display such as audio multiplex broadcast information and closed caption information. Information is also notified. The digital side CPU 11 displays high-quality images on the OSD 10 for both pieces of information in both digital broadcast reception and analog broadcast reception.
[0070]
(9) If there is no analog channel in (8), the analog side CPU 15
Switches the digital / analog switching line to the digital side and notifies the digital side CPU 11 of this via the inter-CPU control line 14.
[0071]
(10) Upon receiving this notification, the digital-side CPU 11 obtains the digital CH frequency stored in all the CH management units 23 and controls the digital analog tuner 18 to select a digital channel.
[0072]
(11) If a digital channel exists, the TV program channel number, title name, main audio or sub audio information, etc. are displayed on the TV screen. If it does not exist, an OSD display such as “No Station Found” is performed.
[0073]
Through the above processing, the viewer can select a channel without being conscious of analog and digital. Even if the digital CPU 11 hangs, the analog CPU 15 can view analog broadcasts.
[0074]
As described above, in the fourth embodiment of the present invention, the all-channel management unit 23 for managing all the digital and analog channel numbers by the digital CPU is added, and the digital CPU also performs analog channel selection instructions. Since the control line of the digital analog tuner is switched by the analog side CPU, it solves the problem of seamless channel selection without being conscious of digital and analog, and digital broadcasting when one CPU is moving And the problem that both analog broadcasts cannot be viewed can be avoided.
[0075]
【The invention's effect】
As described above, according to the present invention, the problem of cost increase can be avoided, and the display position of the display image such as the color of the display image and the channel number in the analog OSD and the digital OSD are different. There is an effect that it is possible to avoid the problem that the viewer feels the poor texture of the OSD when switching the viewing.
[0076]
Also, when an operation such as frequent switching between analog and digital broadcasting is performed, one CPU hangs because of an increase in the communication load between the two CPUs. There is an effect that it is possible to avoid the problem that both analog broadcasting and digital broadcasting cannot be viewed while waiting for a reply of communication.
[0077]
In addition, when digital and analog programs are selected, there is an effect that seamless channel selection without making digital and analog conscious is possible.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a digital analog broadcast receiving apparatus according to a first embodiment of the present invention. FIG. 2 is a diagram showing a configuration of a digital analog broadcast receiving apparatus according to a second embodiment of the present invention. FIG. 4 is a diagram showing a configuration of a digital analog broadcast receiving apparatus according to a third embodiment of the present invention. FIG. 4 is a diagram showing a configuration of a digital analog broadcast receiving apparatus according to a fourth embodiment of the present invention. FIG. 6 is a diagram illustrating a state in which a tuner is controlled by a master CPU. FIG. 6 is a diagram illustrating a state in which a tuner is controlled by a slave CPU according to a second embodiment of the present invention. [Explanation of symbols]
1 Antenna 2 Distributor 3 Digital Tuner 4 Analog Tuner 5 Analog Video Processing Unit 6 DEMUX
7 Video decoder 8 Digital tuner control line 9 Analog tuner control line 10 Digital OSD
11 Digital CPU
12 OSD for analog
13 switching circuit 14 CPU control line 15 analog side CPU
16 Remote control light receiver 17 Remote control transmitter 18 Digital analog tuner 19 Changeover switch 20 Changeover control line 21 Master digital CPU
22 Slave analog CPU
23 All CH Management Department

Claims (8)

Digital analog equipped with digital analog tuner for receiving digital broadcast and analog broadcast, first CPU, second CPU, digital playback unit for converting digital broadcast into visible information, and analog playback unit for converting analog broadcast into visible information In the broadcast receiving apparatus, the first CPU instructs the digital playback unit to convert the digital broadcast into visible information when it is determined that the digital broadcast is stationed, and the analog broadcast is determined to be stationed. A digital analog broadcast receiving apparatus characterized by notifying a second CPU when the determination is made, and instructing the analog playback unit to convert the analog broadcast into visible information. The first CPU instructs the analog playback unit to convert the analog broadcast into visible information when it is determined that the station is determined to be stationed in the analog broadcast. 2. The digital analog broadcast receiving apparatus according to claim 1, wherein the second CPU receives the notification and instructs the digital playback unit to convert the digital broadcast into visible information. 2. A digital switch according to claim 1, wherein a changeover switch for selecting either the first CPU or the second CPU is added to control the digital analog tuner, and the changeover switch is controlled by the first CPU. Analog broadcast receiver. The digital analog tuner according to claim 2, further comprising a changeover switch for selecting either the first CPU or the second CPU for controlling the digital analog tuner, wherein the changeover switch is controlled by the first CPU. Analog broadcast receiver. An all-CH management unit for storing frequency information of all digital broadcast and analog broadcast programs is added. During auto scan, the first CPU switches the direction of the changeover switch to the second CPU and switches to the second CPU. The auto-scan instruction is stored, and the frequency information of the auto-scanned analog broadcast is stored in the all-CH management unit, and when selecting a normal program, the first CPU displays frequency information corresponding to the channel number desired by the viewer. Obtained from the CH management unit, sets the frequency to the digital analog tuner in the case of digital broadcasting, and instructs the second CPU to set the frequency in the case of analog broadcasting. The second CPU 2. The digital analog broadcast receiver according to claim 1, wherein frequency setting is performed for the digital analog tuner. 6. The analog / analog broadcasting according to claim 5, wherein an OSD for displaying information such as analog and digital channel numbers, title names, and main audio or sub audio stored in all CH management sections as visible information is added. Receiver device. When the first CPU hangs, the second CPU switches the direction of the changeover switch to the second CPU, sets the frequency for the digital analog tuner, and enables analog broadcast viewing. The digital analog broadcast receiver according to claim 5. When the first CPU hangs, the second CPU switches the direction of the changeover switch to the second CPU, sets the frequency for the digital analog tuner, and enables analog broadcast viewing. The digital analog broadcast receiver according to claim 6.

Images