JP2009170982A - Tuning information detection device - Google Patents

Abstract

【the purpose】
In order to record and view digital broadcasts using a video deck that does not support digital broadcasts, a tuner having an adapter function for converting digital broadcasts into analog broadcasts is required. However, the present invention makes it possible even without a conversion adapter. .
【Constitution】
In a digital broadcast receiving apparatus, a unique signal generating unit that generates a unique signal that differs for each broadcasting station, a modulating unit that synthesizes modulated waves related to all broadcasting stations, an RF output unit that outputs to a video deck, and a user tuning The channel selection information detection apparatus includes a broadcast station determination unit that obtains information, and converts only the digital broadcast wave of the selected broadcast station into an analog broadcast wave.
[Selection] Figure 2

Description

The present invention relates to a digital broadcast receiving apparatus that receives terrestrial digital broadcasts, and more particularly to viewing means when a video deck that does not have a terrestrial digital broadcast receiving apparatus is connected.

In recent years, digital broadcasting via terrestrial waves, satellite waves, and cables has appeared instead of conventional analog broadcasting. In the future, analog broadcasting will stop due to national policies, and there will be a shift to full digital broadcasting. Progressing.

For this reason, a conventional television receiver that supports only analog broadcasting cannot view any television broadcasting including analog BS broadcasting unless a new tuner is introduced.

FIG. 1 is a configuration diagram in which a digital broadcast tuner is connected to a video deck. The digital broadcast wave received by the antenna 101 is received by the digital broadcast tuner 103, transmitted to the video deck 105, and viewed on the television monitor 107. At this time, if the video deck has a built-in digital broadcast tuner, the signal transmitted by the digital broadcast tuner to the video deck may be a broadcast wave, but if the video deck does not have a built-in digital broadcast tuner, 103 In this case, an operation for converting the frequency into an analog wave broadcasting frequency occurs.

The technology of the digital broadcast tuner is relatively old, but as a technical problem, for example, Patent Document 1 describes synchronization means in a tuner when analog waves and digital waves are mixed. Patent Document 2 describes means for remodulating a digital broadcast signal into an analog broadcast signal with high accuracy.

JP 2003-69907 A JP 2003-304461 A

At present, in order to record and view a digital broadcast using a video deck that does not support digital broadcast, a tuner having an adapter function for converting the digital broadcast into an analog broadcast is required. Although this is generally widespread, it is only a means for performing signal conversion of all stations in the tuner and transmitting the converted signal to the video deck regardless of the broadcasting station desired by the video deck user. It was.

That is, the digital broadcast tuner 103 having an adapter function for converting into an analog broadcast wave receives the digital broadcast wave of all stations, demodulates it, remodulates it to an analog broadcast wave, and transmits it to the video deck 105. For this reason, it is difficult to reduce the size and power consumption of an adapter that converts a digital broadcast wave into an analog broadcast wave, which hinders price reduction.

In the present invention, the communication from the video deck to the tuner is added instead of the one-way communication from the tuner to the video deck, so that the conversion from the digital broadcast wave to the analog broadcast wave performed by the tuner is made only to the necessary station. Is realized.

In order to solve the above problems, the present invention provides a digital broadcast receiver for viewing a digital broadcast by connecting a digital broadcast tuner and a video deck not including the digital broadcast tuner.
A digital broadcast receiver for receiving a signal transmitted from an antenna;
A unique signal generator that generates a unique signal for each broadcasting station;
A modulation unit that modulates a unique signal generated by the unique signal generation unit into a frequency band used by each broadcast station for analog wave broadcasting and synthesizes modulation waves for all broadcast stations;
An RF output unit that transmits a modulated wave by the modulation unit to the video deck as an RF signal;
From a broadcast station determination unit that obtains channel selection information of a user by comparing the modulated wave of the unique signal related to the selected broadcast station received by the digital broadcast tuner from the video deck and the modulated signal of the unique signal of all broadcast stations. Become
A broadcast station corresponding to the modulation signal that matches the unique signal received from the video deck by the broadcast station determination unit is a selected broadcast station, and only the digital broadcast wave of the broadcast station is converted into an analog broadcast wave. It is assumed that the channel selection information detecting device is a feature.

Further, the present invention provides a digital broadcast receiver for viewing a digital broadcast by connecting a digital broadcast tuner and a video deck not including the digital broadcast tuner.
A digital broadcast receiver for receiving a signal transmitted from an antenna;
A modulator that converts the digital broadcast wave of the selected broadcast station into an analog broadcast wave;
An RF output unit that transmits a modulated wave by the modulation unit to the video deck as an RF signal;
A broadcasting station determination unit that determines whether the channel selection of the user has been changed by comparing the analog wave broadcasting signal received from the video deck by the digital broadcasting tuner and the modulation signal by the modulation unit,
The channel selection information detecting apparatus, wherein if the two signals are different as a result of comparison by the broadcast station determination unit, it is determined that the user has changed the channel selection.

According to the present invention, a digital broadcast tuner having an adapter function for converting into an analog broadcast wave demodulates a digital signal wave of only a channel desired by a video deck user, remodulates it to an analog broadcast wave, Since it can be retransmitted to the video deck, it is possible to reduce the size, power consumption, and cost of the device.

A preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram of a digital broadcast receiving system according to the present invention. A digital broadcast wave signal of each broadcast station received by the antenna arrives at the digital broadcast receiving unit 201.

The unique signal generator 203 generates a unique signal determined in advance for each channel number of each broadcasting station. The switch 205 selects either the digital broadcast receiver 201 or the unique signal generator 203, Modulation is performed by the modulation unit 207.

A processing block diagram when the switch 205 selects the unique signal generator 203 is shown in FIG.

An arbitrary unique signal 303 set in advance according to the channel number 301 for each broadcasting station is modulated by the modulation unit 305 at a frequency used by the station in analog broadcasting, and the modulation result of all broadcasting stations is received from the RF output unit 307. Output the composite signal to the VCR. Here, the number of digits, the content of the signal, etc. of the unique signal 303 are not particularly limited as long as the broadcasting station can be identified.

In this way, a unique signal for each broadcasting station arrives in the video deck 211, but when the user selects a channel by operating the channel selection device, the selected broadcasting station Only the unique signal is retransmitted to the video input terminal of the digital broadcast tuner 215 via the video output of the video deck. This is the channel selection information signal.

The channel selection information signal input from the video input terminal of the digital broadcast tuner 215 is transmitted to the broadcast station determination unit 213. The broadcast station determination unit 213 compares and searches the unique signal of each broadcast station transmitted from the digital broadcast tuner toward the video deck and the channel selection information signal transmitted from the video deck toward the digital broadcast tuner.

The broadcast station determination unit is shown in FIG. A broadcast station determination unit 403 includes a modulated unique signal 401 corresponding to each broadcast station transmitted from the digital broadcast tuner to the video deck, and a channel selection information signal 405 related to the broadcast station selected by the video deck user. Is input. Based on these signals, the broadcast station determination unit determines a unique signal sequence that matches 405 out of 401 signal groups.

The signal used by the broadcast station determination unit is not limited to a unique signal after modulation. That is, when the signal in the state 303 in FIG. 3 is used, an equivalent process can be performed by using the channel selection information signal demodulated by the demodulator.

When the broadcast station determination unit 213 can determine the broadcast station selected by the video deck user, the switch 205 is connected to the digital broadcast reception unit 201. In the prior art, the converter to the analog broadcast wave in the digital broadcast tuner is performed for all broadcast stations. However, since the channel selection information of the user is known by the present invention, the switch 205 is connected to the digital broadcast receiver 201. When connected, the modulation unit 207 may modulate only the broadcast wave related to the selected broadcast station into an analog broadcast wave signal and retransmit it.

As described above, since only the digital broadcast wave related to the selected broadcast station is output as an analog broadcast wave from the RF output unit 209 to the video deck, even a user of a video deck that does not have a digital broadcast wave tuner, It is possible to view the digital broadcast of the selected broadcast station as an analog broadcast wave.

Next, the case where the user of the video deck changes the selected broadcast station while viewing the program will be described.

Signal transmission from the video deck to the video input of the digital broadcast tuner is always performed even during broadcast viewing, and this is used as a viewing information signal. A retransmitted broadcast signal and a viewing information signal retransmitted to the video deck are input to the broadcast station determination unit.

However, if the user changes the broadcast station by operating the video deck's channel selection device, the broadcast wave of the newly selected broadcast station has not arrived at the video deck at that time, so the TV monitor The video no longer appears. That is, the broadcast station determination unit has a difference between the retransmitted broadcast signal and the viewing information signal.

If there is a difference between the retransmitted broadcast signal and the viewing information signal in this way, the switch 205 is switched to the unique signal generator again to return to the stage of obtaining the user's channel selection information, and when the selected broadcast station is determined. Retransmit the broadcast of the corresponding broadcasting station.

FIG. 5 shows a series of processing flows described above. First, broadcast station determination is performed. In the broadcast station determination, the channel selection information signal transmitted by the video deck is compared with the unique signal, and the broadcast station corresponding to the matching unique signal is determined as the selected broadcast station. Next, the digital broadcast wave of the selected broadcast station is converted into an analog broadcast wave and output from the RF output unit of the digital broadcast tuner to the video deck, so that the user can convert the digital broadcast of the desired broadcast station to analog Watch as a broadcast.

During this time, the viewing information signal and the retransmission signal are input to the broadcasting station determination unit, and it is always monitored whether the user changes the channel selection and the match between the viewing information signal and the retransmission signal has changed. ing. If it has changed, the process returns to the broadcasting station determination again, and if it has not changed, the processing is continued.

As described above, the unique signal is not limited to that shown in the present embodiment, and for example, a broadcast wave may be used as shown in FIG. FIG. 6 is a schematic diagram in which the broadcast station determination unit uses the broadcast wave itself. That is, the received digital broadcast wave is converted into an analog broadcast wave for each broadcast station, the signal is transmitted from the RF output unit to the video deck, and the RFin signal corresponding to the frequency of the broadcast station selected by the user is converted into the video deck. The broadcast station selected by the user can be known by comparing the video output and the converted analog broadcast wave signals.

In addition, in the case of using the broadcast wave and the case of using a pre-defined code sequence as a unique signal, it is not limited to means for synthesizing all the broadcast stations and sending them to the video deck, and supports each broadcast station The same result can be obtained even if the signal to be transmitted is transmitted to the video deck for each broadcasting station. In that case, the circuit can be further reduced in size and power consumption can be reduced.

According to the present embodiment, a user can view a digital broadcast as an analog broadcast using a video deck that does not have a digital broadcast tuner. At that time, unlike the conventional technology, the digital broadcasting tuner can obtain the channel selection information of the user, so it is only necessary to convert only the digital broadcasting wave related to the necessary broadcasting station into analog broadcasting. Can contribute.

General digital broadcast reception format Digital broadcast tuner according to the present invention Unique signal generation means Input signal diagram to the broadcasting station judgment section to obtain the tuning Overall processing flowchart Example of transmitting a unique signal for each broadcasting station

Explanation of symbols

101 ... antenna, 103 ... digital broadcast tuner,
105 ... Digital VCR, 107 ... TV,
201: Digital broadcast receiving unit, 203 ... Unique signal generating unit,
205 ... Switch, 207 ... Modulation unit, 209 ... RF output unit,
211 ... VCR, 213 ... Broadcasting station determination unit,
215 ... Digital broadcast tuner,
301 ... Broadcasting station 303 ... Unique signal sequence,
305 ... modulation of a unique signal sequence, 307 ... RF output section,
401 ... Unique signal, 403 ... Broadcasting station determination unit,
405 ... Channel selection information signal

Claims (2)

In a digital broadcast receiver for viewing a digital broadcast by connecting a digital broadcast tuner and a video deck not incorporating the digital broadcast tuner,
A digital broadcast receiver for receiving a signal transmitted from an antenna;
A unique signal generator that generates a unique signal for each broadcasting station;
A modulation unit that modulates a unique signal generated by the unique signal generation unit into a frequency band used by each broadcast station for analog wave broadcasting, and synthesizes modulation waves for all broadcast stations;
An RF output unit for transmitting a modulated wave by the modulation unit to the video deck as an RF signal;
From a broadcast station determination unit that obtains channel selection information of a user by comparing the modulated wave of the unique signal related to the selected broadcast station received by the digital broadcast tuner from the video deck and the modulated signal of the unique signal of all broadcast stations. Become
A broadcast station corresponding to the modulation signal that matches the unique signal received from the video deck by the broadcast station determination unit is a selected broadcast station, and only the digital broadcast wave of the broadcast station is converted into an analog broadcast wave. A tuning information detecting apparatus characterized by the above. In a digital broadcast receiver for viewing a digital broadcast by connecting a digital broadcast tuner and a video deck not incorporating the digital broadcast tuner,
A digital broadcast receiver for receiving a signal transmitted from an antenna;
A modulator that converts the digital broadcast wave of the selected broadcast station into an analog broadcast wave;
An RF output unit that transmits a modulated wave by the modulation unit to the video deck as an RF signal;
A broadcasting station determination unit that determines whether the channel selection of the user has been changed by comparing the analog wave broadcasting signal received from the video deck by the digital broadcasting tuner and the modulation signal by the modulation unit,
The channel selection information detecting apparatus, wherein if the two signals are different as a result of comparison by the broadcast station determination unit, it is determined that the user has changed the channel selection.