JP2002353829A - Ground wave digital broadcast receiver and information acquisition supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground wave digital broadcast receiver that automatically and continuously allows viewing a program even if the receiver comes out of a reception area of the program being viewed and to provide an information acquisition providing device. SOLUTION: In order to transmit local channel selection information by utilizing a road traffic information system, a radio wave beacon reception section 31, an optical beacon reception section 32 and an FM reception section 33 acquire channel selection information in an area where a vehicle is located, and the channel selection information is given to the ground wave digital broadcast receiver 30 via a car navigation system 35. When being deviated from the reception area during program viewing, the ground wave digital broadcast receiver 30 uses the channel selection information so as to execute the channel selection processing in a way of consecutively viewing the program having been viewed up to now.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast receiving apparatus for receiving and demodulating digital broadcast waves and outputting video signals and audio signals.

[0002]

2. Description of the Related Art Digital terrestrial broadcasting uses digital signal compression technology to compress video and audio signals, and allocates a time-division multiplexed stream (transport stream) of video and audio digital signals of a plurality of programs to channels. The transmission will be performed using the assigned frequency. On the other hand, a broadcast receiving apparatus for receiving such a terrestrial digital broadcast selects one of a plurality of frequencies of the terrestrial digital broadcast received through a conventional TV antenna with a tuner, and includes the selected frequency in the one frequency. One of a plurality of channels (programs) is selected by demultiplex processing, and a video / audio signal is output by decoding a digital signal of the selected channel (program). In such terrestrial digital broadcasting, OF is strong against ghost.
DM (Orthogonal Frequency D)
Since a transmission method called “vision multiplex” is adopted, it is conceivable to mount a terrestrial digital broadcast receiving apparatus on a mobile body such as a car.

[0003]

When such a receiver for receiving digital terrestrial broadcasts is mounted on a mobile unit, the receiver moves out of the reception area of the frequency of the currently receiving channel due to movement. There is a phenomenon that it becomes impossible. In this case, broadcast reception may be possible by a user's channel selection operation or a channel search by the receiving device. However, in the channel selection by the user, the user takes time and the channel search by the receiving device is performed. Then, it is difficult to immediately acquire tuning information of each broadcasting station.

[0004] In view of the above circumstances, the present invention provides a terrestrial digital broadcast receiving apparatus capable of automatically and continuously viewing a currently watched program even if the user goes out of a reception area while watching the program. And an information acquisition and provision device.

[0005]

In order to solve the above-mentioned problems, a terrestrial digital broadcast receiving apparatus according to the present invention receives a terrestrial digital broadcast, demodulates the signal, and outputs a video signal and an audio signal. In the broadcast receiving apparatus, information acquisition means for acquiring at least channel selection information from an information source different from the terrestrial digital broadcast by itself or through another externally connected device, and channel selection based on the obtained channel selection information. And a channel selecting means for performing the selection.

With the above-described structure, even if it is out of the reception area during program viewing and it becomes difficult to receive a program, channel selection is performed using channel selection information obtained from an information source different from digital terrestrial broadcasting. The user can immediately select a channel without bothering the user and performing a channel search by the receiving device.

[0007] The information acquisition means preferably acquires information using at least one of FM teletext, an optical beacon, and a radio beacon as an information source. A means for determining a reception radio wave state of the terrestrial digital broadcast; and a control means for causing the channel selection means to perform channel selection based on the channel selection information acquired by the information acquisition means when the reception radio wave condition deteriorates. , It is better to have. Further, the control unit acquires program information from a channel selected based on the channel selection information acquired by the information acquisition unit, and receives the same program as the program watched before the reception radio wave condition deteriorates. It is good to be constituted so that processing may be carried out.

[0008] Further, the information acquisition and supply device of the present invention is characterized in that:
An information acquisition unit that acquires information by using at least one of an M-text multiplex broadcast, an optical beacon, and a radio beacon as an information source; and a supply unit that supplies the acquired information to a digital terrestrial broadcast receiver. It is characterized by. Such an information acquisition and supply device preferably includes a global positioning system and is configured to perform car navigation.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A digital terrestrial broadcasting receiver according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram showing a broadcast receiving apparatus 30 of this embodiment capable of viewing digital terrestrial broadcasting. FIG. 2 shows a system in which the digital terrestrial broadcasting receiving apparatus 30 is combined with a navigation system 35 and the like. FIG. 3 is a flowchart showing the processing contents of the system.

In FIG. 1, a terrestrial antenna 1 receives a terrestrial broadcast wave and supplies a received signal to a terrestrial digital tuner 2. The terrestrial digital tuner 2 includes a channel selection processing circuit, a mixer (mixer), and the like. The mixer mixes the signal of the desired channel and the local oscillation signal to generate an intermediate frequency signal. The circuit that generates the local oscillation signal
For example, it includes a variable capacitance diode or the like whose capacitance changes according to an applied voltage, and generates a local oscillation signal changed corresponding to a signal of a desired channel so that a signal of a constant intermediate frequency is output from the mixer. The tuning processing circuit receives data of an applied voltage (tuning voltage) corresponding to each channel from a memory (for example, an EEPROM) 11 and converts the data into an analog signal (voltage) by a D / A converter (not shown). Give to variable capacitance diode.

The terrestrial digital tuner 2 extracts a signal of a specific frequency from high-frequency digital modulation signals including video and audio data by the above-described channel selection processing. Also, the terrestrial digital tuner 2 includes a deinterleave circuit, an error correction circuit, a demodulation circuit, and the like, thereby demodulating the selected digital modulation signal and outputting a transport stream. Further, the terrestrial digital tuner 2 gives the CPU 13 a C / N and an error rate indicating the reception state of the digital broadcast wave.

The demultiplexer (DEMUX) 3 converts the transport stream received from the tuner 2 into an MPEG2 (Moving Picture Ex
Parts Group 2) video transport packet, audio transport packet, and PS
I / SI (Program Specific Inf)
operation / Service Information
ion). The demultiplexer 3 supplies the video transport packet and the audio transport packet to the AV decoder 4 and converts the PSI / SI into the CPU.
12 In addition, a plurality of channels can be multiplexed in the transport stream, and a process for selecting an arbitrary channel from among these channels is as follows.
NIT (Network Information) in the PSI
ation Table), PAT (Program
Association Table), CAT (Co
This can be achieved by extracting data such as which packet ID is multiplexed in the transport stream with an arbitrary channel from the “native access table”. Further, the SI (service information) includes program information (program contents, program start time, program continuation time, genre information, etc.), and an EPG screen is configured based on such information.

The AV decoder 4 includes a video decoder for decoding video transport packets and an audio decoder for decoding audio transport packets. The video decoder is
The input variable length code is decoded to obtain a quantization coefficient and a motion vector, and inverse DCT transform and motion compensation control based on the motion vector are performed. The audio decoder generates audio data by decoding the input coded signal. The video data generated by the decoding is output to the video processing circuit 5, and the audio data is output to the audio processing circuit 6.

A video processing circuit 5 receives video data from the AV decoder 4 and performs D / A conversion to generate a video signal. The audio processing circuit 6 receives the audio data output from the AV decoder 4 and performs D / A conversion to generate an analog audio signal.

An OSD (on-screen display) circuit 12 outputs to the adder 20 a video signal corresponding to the character information output from the CPU 13. The adder 20 incorporates the video signal from the OSD circuit 12 into the received video signal, and supplies this video signal to the video output circuit 7.

The video output circuit 7 and the audio output circuit 8 are provided with an output resistor, an amplifier and the like. The AV output terminal 9 is provided with an output unit (a set of left and right audio output terminals, a video output terminal, and the like). This output unit has a video / audio code 1
A monitor 16 having a liquid crystal display panel 16a and a speaker 16b is connected by the switch 7.

The remote control transmitter 10 is a transmitter for transmitting a command to the broadcast receiving device 30. When a key provided on the remote control transmitter 10 is operated, a signal light (remote control signal) indicating a command corresponding to the key is transmitted from a light emitting unit (not shown). Remote control receiver 11
Receives the signal light, converts it to an electric signal,
It is given to PU13. The operation panel 18 is also provided with various command keys. When these keys are operated, a signal indicating a command corresponding to the key is sent to the CPU 1.
3 given. The operation panel 18 is a liquid crystal display panel 16
It is also possible to provide a touch panel or the like in a.

The non-volatile memory 14 stores channel selection information (this channel selection information contains information indispensable for channel selection such as information for identifying a broadcast station and information on the channel (frequency) of the channel selection). In addition, information for assisting the channel selection operation such as a region code may be included, and program information (program content, program start time, program duration, genre information, and the like) are stored.

An interface (for example, IEEE1394) 15A on the receiving device 30 side and an interface 15B on the car navigation system 35 side are connected by a code 36, and control signals and data are transmitted between the CPU 13 and the car navigation system 35. Is transmitted.

In FIG. 2, the radio wave beacon receiving unit 31
Is configured to include an amplification circuit for amplifying a beacon signal received by an antenna, a detection circuit, a data demodulation circuit, and the like. The radio beacon receiving unit 31 supplies the demodulated data to the car navigation system 35.

The optical beacon receiving section 32 includes an amplifier circuit for amplifying a received optical beacon signal, a detection circuit, a data demodulation circuit, and the like. The optical beacon receiving unit 32
The demodulated data is supplied to the car navigation system 35.

The FM receiver 33 includes an amplifier circuit for amplifying FM radio waves received by an antenna, an FM detection circuit, a data demodulation circuit for FM teletext, and the like. F
The M receiving section 33 supplies the demodulated data to the car navigation system 35.

GPS (Global Position)
The receiving unit 34 includes an amplification circuit that amplifies radio waves received by the GPS antenna, a detection circuit, a data demodulation circuit, and the like. GPS receiver 34
Supplies the demodulated data to the car navigation system 35.

The car navigation system 35 generates a map image, calculates the current position of the car, and displays it on the map image. The current position is the demodulated data output from the GPS receiver 34 or the beacon receiver 3
Calculation is performed based on the demodulated data output from 1.32. Further, the car navigation system 35 acquires road traffic information corresponding to the area based on the demodulated data output from the beacon receiving units 31 and 32 or the demodulated data output from the FM receiving unit 33 and accumulates it in a memory (not shown). You can do it. If the beacon or FM teletext broadcast has transmitted the local tuning information and the program information in addition to the road traffic information, the car navigation system 35 can obtain the local tuning information in which the car is located. become. When the CPU 13 requests the provision of the tuning information via the interface 15, the information is given to the CPU 13 of the receiving device 30 via the interface 15 (steps S 21 and S 22 in the flowchart of FIG. 3). , 23
reference).

The CPU 13 of the receiving device 30 controls the tuning of the terrestrial digital tuner 2 and the like, controls the writing / reading of program information and the like to / from the memory 14, the control of the demultiplexer 3, the control of the AV decoder 4, the OSD
Control and the like for the circuit 12 are performed. Then, as a process according to the present invention, a process for the car navigation system 35 is also performed. Such processing is shown in FIG.
The description will be made based on the flowchart of FIG. CPU 13
Determines whether a reception failure has occurred in the reception state of the terrestrial digital broadcasting (step S
1). This determination can be made based on the C / N and error rate output from the terrestrial digital tuner 2. If a reception failure occurs, "Reception failure occurred"
Is displayed (step S2), and channel selection information is requested to the car navigation system 35 (step S3). When the tuning information is acquired from the car navigation system 35 by this request (step S
4) Compare the acquired tuning information with the tuning information stored in the memory 14 (step S5). It is determined whether there is no difference (step S6). If it is determined that there is no difference in the difference, it is considered that departure from the reception area is not the cause of the reception failure but the reception failure due to traveling in the tunnel or other reasons. Is displayed, and a process of waiting until reception becomes possible is performed (step S7). On the other hand, if there is a difference, a broadcast station is selected based on the channel selection information obtained from the car navigation system 35, and program information is obtained (step S8). Then, it is determined whether or not there is a program that has been received until immediately before (step S9).
This determination is based on information embedded in the digital broadcast wave, for example, EIT (EventInformation).
n Table). If there is a program that has been received immediately before, the program is displayed (step S12). If not, it is determined whether or not all channels have been selected (step S10). If NO, the process proceeds to step S9 to select a different broadcast station. On the other hand, if all channels have been selected, for example, a message such as "There is no program being watched" is displayed for a while,
For example, the program of the channel selected last is displayed (step S11).

In the above example, the receiving apparatus 30 transmits information from the FM text broadcast, the optical beacon, and the radio beacon, which are information sources different from the terrestrial digital broadcast wave, via the car navigation system 35, which is another device. However, a configuration in which the receiving apparatus 30 can obtain information from the FM text broadcasting, the optical beacon, and the radio beacon by itself may be adopted. Also, assuming that the amount of information that can be transmitted by optical beacons or radio beacons will increase in the future, for example, it will be possible to transmit video information,
It is also possible to adopt a configuration in which the video information is obtained by the car navigation system 35 or obtained by itself, and the video is displayed on the monitor 16.

Reception area information of each broadcasting station is stored in the memory 14 of the reception device 30. When a reception failure occurs, the reception area information and the current position provided by the car navigation system 35 are stored. To determine whether the broadcast station that has been received up to that time is within the receivable area, and when it is determined that the broadcast station is within the receivable area (for example, when traveling in a tunnel Such a situation may occur), a message "Wait until reception is possible" is displayed, and a process of waiting until reception becomes possible may be performed.

[0029]

As described above, according to the present invention, channel selection information can be obtained from an information source other than terrestrial digital broadcasting. There are various effects such as being able to continuously view the program currently being viewed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a digital terrestrial broadcast receiver according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a system configuration for obtaining information from an information source other than digital terrestrial broadcasting.

FIG. 3 is a flowchart showing an example of processing contents of the present invention.

[Explanation of symbols]

 Reference Signs List 1 antenna 15A interface 15B interface 30 terrestrial digital broadcast receiver 31 radio beacon receiver 32 optical beacon receiver 33 FM receiver 34 GPS receiver 35 car navigation system 16 monitor

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C025 AA23 BA27 CA09 CB07 DA01 DA05 DA07 5H180 AA01 BB02 BB04 EE18 FF05 FF12 FF13 FF27 5K061 AA09 BB06 BB07 CC45 FF13 FF16

Claims (6)

[Claims] 1. A terrestrial digital broadcast receiving apparatus which receives and demodulates terrestrial digital broadcast and outputs a video signal and an audio signal. A terrestrial digital broadcast receiving apparatus, comprising: information acquisition means for acquiring via a connected other device; and tuning means for tuning based on the acquired tuning information. 2. The terrestrial digital broadcast receiving apparatus according to claim 1, wherein the information acquiring means acquires the information by using at least one of an FM text multiplex broadcast, an optical beacon, and a radio beacon as an information source. A terrestrial digital broadcast receiving apparatus, comprising: 3. A terrestrial digital broadcast receiving apparatus according to claim 1, wherein said means for judging a reception radio wave condition of the terrestrial digital broadcast and said information acquisition means when the reception radio wave condition deteriorates. A terrestrial digital broadcast receiving apparatus, comprising: control means for causing the tuning means to perform tuning based on the acquired tuning information. 4. The terrestrial digital broadcast receiving apparatus according to claim 3, wherein the control unit acquires program information from a channel selected based on the channel selection information obtained by the information obtaining unit, and A terrestrial digital broadcast receiving apparatus that processes so as to receive the same program as the program that was viewed before the deterioration of the terrestrial broadcasting. 5. An information acquisition unit for acquiring information using at least one of FM text multiplex broadcasting, an optical beacon, and a radio beacon as an information source, and a supply unit for supplying the acquired information to a terrestrial digital broadcast receiving apparatus. An information acquisition and supply device comprising: 6. The information acquisition and supply device according to claim 5, further comprising a global positioning system, and configured to perform car navigation.