JP2003224780A - Converter and receiver for terrestrial broadcasting signal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an analog/digital terrestrial broadcasting receiver satisfying economical efficiency and operability in environment where analog terrestrial broadcasting and digital terrestrial broadcasting coexist. <P>SOLUTION: The converter is constituted so that a signal received by a tuner 14 that receives digital broadcast is converted into a video signal and a sound signal of a base band by an OFDM (Orthogonal Frequency Division Multiplexing) demodulation/error correction means 16, an MPEG (Moving Picture Expert Group) demodulator 17, is converted into an analog broadcast signal of the same channel as digital broadcast by a format converter 18, an NTSC (National Television System Committee) encoder 19 and an RF (Radio Frequency) demodulator 20 and on the other hand, is mixed with an analog broadcast signal of the same channel as that of the digital broadcast channel and the frequency band of which is restricted and outputted to an analog receiver as an antenna receiving broadcast signal. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terrestrial broadcast signal conversion device and a terrestrial broadcast reception device that allow a receiver dedicated to analog broadcasting to receive a terrestrial broadcast signal in which analog broadcasting and digital broadcasting are mixed.

[0002]

2. Description of the Related Art The digitization of terrestrial broadcasting in Japan is planned to start in 2003 in the three major metropolitan areas of Tokyo, Osaka, and Nagoya, and in 2006 in other regions. The policy of switching from wave broadcasting to digital broadcasting has been announced, and preparations are currently underway in various fields.

Therefore, between 2003 and 2010, conventional analog broadcasting and digital broadcasting will coexist, and it is expected that receivers that receive the same will also coexist with analog and digital systems. For viewers, it is necessary to prepare a device that can receive the intended broadcast while considering the broadcast content, but considering economic efficiency, there is not necessarily a suitable device on the market, and some kind of compromise is forced. Become.

That is, at present, the viewer has to select one of the following options. (1) Give up the reception of digital broadcasting and watch only analog broadcasting with a conventional analog receiver. (2) Convert the digital broadcast into an analog broadcast signal by some method, and watch the digital broadcast together with the analog broadcast by an analog receiver. (3) In addition to the conventional analog receiver, purchase a digital broadcast receiver to view analog broadcast and digital broadcast. (4) Give up the reception of analog broadcasting, purchase a digital broadcasting receiver and watch digital broadcasting. To build a receiving facility that can receive both analog and digital broadcasting, the above (2) and (3) are selected, but the form of (3) is when the number of digital broadcasting channels is small. Can be uneconomical, and it can be imagined that there is a problem that it is necessary to operate the analog receiver and the digital receiver separately such as channel switching. Further, the following two methods are conceivable in the existing technology as means for realizing the form (2). (A) Use a set-top box (terrestrial digital tuner) for receiving digital broadcasting. (B) Utilize digital-analog conversion (digital / analog conversion) by a cable TV station. The above method (a) is performed by, for example, BS (Broadcasting Sate
(Llite) A terrestrial digital set-top box that has the same functions as the BS digital set-top box (BS digital tuner) used in digital broadcasting is used, and the number of digital broadcasting channels is the same as in (3) above. However, it is uneconomical when there are few, and in this case also, there is a problem that it is troublesome because it is necessary to individually operate such as channel switching at the time of viewing. In addition, (b) above
The method of, for example, BS digital broadcasting or CS (Comm
unications Satellite) is to utilize digital / analog conversion known as analog retransmission technology in cable television stations for digital broadcasting.
If the cable TV station provides the service, you can subscribe and watch. However, even in this case, it is uneconomical to subscribe to the cable television only to watch the terrestrial digital broadcasting.

Further, as a matter of course, if a receiver capable of receiving digital broadcasting and analog broadcasting comes on the market in the future, both broadcasting can be received, but the same cost as in the above (2) is required, Considering that analog broadcasting will be abolished eventually, the feeling of being uneconomical cannot be wiped out. Such a receiving system is disclosed in, for example, JP 2001-1.
It is described in Japanese Patent No. 84307.

As described above, at present, the market is
In view of a period when analog broadcasting and digital broadcasting are mixed, economical and excellent operability devices have not been provided, and realization of such a device is strongly desired.

[0007]

In the conventional receiving apparatus,
If we try to realize a device that can receive both analog and digital broadcasts, the equipment for receiving digital broadcasts will be compatible with future full-scale digital broadcasts, which is not economical and has poor operability. There was a problem.

The present invention has been made in view of the above points, and by combining a conversion device for converting a digital broadcast signal into an analog broadcast signal with an analog broadcast receiver,
It is an object of the present invention to provide a device that can receive both analog broadcasting and digital broadcasting that is low in cost and excellent in operability.

[0009]

A terrestrial broadcast signal converter according to the present invention is provided with an input terminal to which broadcast signals of a plurality of channels including analog terrestrial broadcast and digital terrestrial broadcast are supplied, and to the input terminal. Processing means for receiving a digital broadcast channel of the broadcast signal to generate a baseband video signal and audio signal, and an analog system having a frequency of a predetermined channel from the video signal and audio signal generated by the processing means. Generating means for generating a broadcast signal, multiplexing means for limiting a frequency band of a broadcast signal of an analog broadcast channel supplied to the input terminal and multiplexing the generated analog broadcast signal, and output of the multiplexing means. And an output terminal to be supplied.

According to the present invention, a terrestrial broadcast in which an analog broadcast receiver can also receive a digital broadcast signal simply by connecting between the output end of the antenna cable and the antenna input terminal of the analog broadcast receiver. A signal converter can be provided.

The terrestrial broadcast signal receiving apparatus of the present invention receives an input terminal to which broadcast signals of a plurality of channels including analog terrestrial broadcast and digital terrestrial broadcast are supplied, and a broadcast signal input to the input terminal. A distributor that distributes at least two outputs, a digital tuner that is connected to one of the output ends of the distributor and that is set to select a channel of the digital terrestrial broadcasting, and an output end of the distributor. Filter means for limiting the passage of frequency band components of the digital terrestrial broadcasting channel, and a baseband video signal and audio signal from the digital terrestrial broadcasting signal of the channel selected by the tuner. A processing means to obtain, and a broadcasting frequency of the channel of the digital terrestrial broadcasting based on the baseband video signal and audio signal. Conversion means for converting to a analog broadcast signal, multiplexing means for multiplexing the output of the conversion means and the output of the filter means and outputting to an output terminal, an analog tuner for receiving a broadcast signal output from the output terminal, Reception signal processing means for generating and outputting a baseband video signal and audio signal from a broadcast signal of a channel received by the analog tuner.

According to the present invention, a converter for converting a digital broadcast signal into an analog broadcast signal at an antenna input terminal of the analog broadcast receiver and supplying the analog broadcast signal with the signal originally broadcast as the analog broadcast signal to the analog broadcast receiver. By being configured so as to be combined with the broadcast receiver, it is possible to provide a terrestrial broadcast signal receiving device capable of receiving a digital broadcast signal with an analog broadcast receiver.

Furthermore, the terrestrial broadcast receiving apparatus of the present invention comprises:
A first tuner for receiving broadcast signals of a plurality of channels including an analog broadcast signal and a digital broadcast signal and supplied from an antenna to an input terminal; and a first channel selection means for switching a reception channel of the first tuner. , The first
Conversion means for converting the broadcast signal of the digital broadcast received by the tuner of the same into an analog broadcast signal of the same channel,
Based on the discrimination means for discriminating whether or not the channel received by the first tuner is a digital broadcast channel, and based on the discrimination result by the discrimination means, the output of the conversion means is derived to the output terminal when the digital broadcast is received. Output control means for deriving a broadcast signal supplied to the input terminal to the output terminal through a path that does not pass through the tuner when the digital broadcast is not used, and a second receiving means for receiving the broadcast signal output from the output terminal. A receiver provided with a tuner, a second tuning unit provided in the receiver for switching a reception channel of the second tuner, and the first and second tuning units are commonly controlled, The first and second tuners are provided with channel switching control means for performing channel switching so as to receive the same channel.

According to the present invention, the viewer does not have to be aware of which channel the digital broadcast is broadcast in the environment where the analog broadcast and the digital broadcast are mixed, and all the digital broadcast signals are transmitted on the same channel. It is possible to provide a device that is economical and easy to operate because it can be converted into an analog broadcast signal for viewing.

[0015]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a terrestrial broadcast signal conversion device according to the present invention. In FIG. 1, 11 is a terrestrial receiving antenna, 12 is an antenna input terminal, and 13 is a distributor. The terrestrial broadcast signal input from the antenna is divided into two by the distributor 13, and the tuner 14 and the filter 1
5 is supplied. The tuner 14 is a tuner for receiving terrestrial digital broadcasting, and is set to receive a terrestrial digital broadcasting channel. The output of the tuner 14 is OFDM (Orthogonal Frequency Division Mul).
tiplexing: Orthogonal frequency division multiplexing) demodulation / error correction unit 1
Demodulated in 6 and further subjected to error correction and TS (Transp
ort stream) signal and converted to MPEG (Moving Pic)
ture Expert Group) to the demodulation unit 17. These tuner 14, OFDM demodulation / error correction unit 16, M
The PEG demodulation unit 17 carries out various research and development based on a report from the Telecommunications Technology Council regarding the terrestrial digital television broadcasting system announced by the Ministry of Internal Affairs and Communications, Ministry of Posts and Telecommunications (Former Ministry of Posts and Telecommunications) on May 24, 1999. Since it is known and generally well known, detailed description is omitted. The MPEG demodulation unit 17 performs MPEG decoding and outputs a baseband video signal and a baseband audio signal. The baseband video signal passes through a format converter 18 for converting various video formats into a 525i (interlace with 525 scanning lines) system, which is a terrestrial analog broadcasting system format, and passes through NTSC (National Televisi).
on System Committee) encoder 19 to convert the composite video signal to RF (Radio Frequen)
cy) is supplied to the modulator 20. MP in the RF modulator 20
A baseband audio signal is also supplied from the EG demodulation unit 17, and is modulated here as an analog broadcast signal. This broadcast signal passes through the mixer 21, is amplified by the amplifier 22, and is guided to the output terminal 23. On the other hand, the broadcast signal supplied from the distributor 13 to the filter 15 is supplied to the mixer 21 after the frequency band component of the digital broadcast channel received by the tuner 14 is limited by the filter 15, and then the aforementioned RF modulation is performed. It is mixed with the broadcast signal generated by the device 20 and supplied to the amplifier 22. The output of the amplifier 22 is led to the output terminal 24 via the terminal 23. The circuit portion from the filter 15 and the OFDM demodulation / error correction unit 16 to the terminal 23 is housed inside the electromagnetic shield structure 25, and the terminal 23 is a terminal for taking out the output of the amplifier 22 from the electromagnetic shield structure 25. Shield structure 25
Are provided to prevent interference between the frequency of the broadcast signal generated by the RF modulator 20 and the frequency of the broadcast signal input from the antenna 11, as described later. Further, the entire device is covered with a housing 26, and the housing 26 is provided with the input terminal 12 and the output terminal 24.

The operation of the terrestrial broadcast signal conversion device configured as described above will be described with reference to FIG. Figure 2 (a) shows
This is an example of a case where analog broadcasting and digital broadcasting are mixed in broadcasting radio waves in the UHF (Ultra High Frequency) band. The UHF band television channels are assigned a band of 6 MHz per channel as shown by the dotted line. The analog system includes a video carrier (Yc) and an audio carrier (Sc) in the channel band, and a digital system uses a 6 MHz band. OFDM in band
It contains a large number of carriers due to modulation.

FIG. 2A shows a situation in which digital broadcasting is performed on channel number 34 and analog broadcasting is performed on other channels. 2 (a)
Then, the broadcasting format of 30 to 36 channels was shown, but U
Channels 13 to 62 are assigned to channels in the HF band, and channels 30 to 36 are part of them.

As shown in FIG. 2A, in an environment in which broadcasting in which analog broadcasting and digital broadcasting are mixed is performed, both types of broadcasting signals are received by using the terrestrial broadcasting signal conversion apparatus of FIG. In this case, first, the tuner 14 of FIG.
Is set to receive the channel 34 on which digital broadcasting is being performed. The RF modulator 20 is configured to output an analog broadcast signal in the frequency band of the channel 34, and the filter 15 has a characteristic of limiting the frequency band of the channel 34, as shown in FIG. Set to have. The digital broadcast signal received by the tuner 14 is transmitted to the OFDM demodulation / error correction unit 16,
MPEG demodulator 17, format converter 18, NTS
After passing through the C encoder 19, it is converted into an NTSC format video signal and a baseband audio signal, supplied to the RF modulator 20, generated by the RF modulator 20 as an analog broadcast signal of the channel 34, and output to the mixer 21. It On the other hand, the broadcast signal is supplied from the distributor 13 to the mixer 21 via the filter 15. However, since the frequency band of the channel of the digital broadcast is limited by the filter 15, when the mixer 21 mixes the signals. RF modulator 2
As a result, as shown in FIG. 2 (c), the broadcast signal which is all converted into the analog broadcast signal is output from the mixer 21 through the amplifier 22 and the terminal 23 through the output terminal 24 without causing interference with the output of 0. Will be done.

In the example shown in FIG. 2, the characteristic of the filter 15 is set so as to limit the frequency band of the digital broadcast channel, but the purpose of the filter 15 is to set the broadcast signal generated by the RF modulator 20. This is to prevent unnecessary signals from existing in a band, and may be set in another band.

The apparatus shown in FIG. 1 is structurally configured as the apparatus shown in FIG.

In FIG. 3, the same reference numerals as those in FIG. 1 have the same functions. Although not shown in FIG. 1, a power cord 30 having a power plug (not shown) at the tip for supplying electric power to the device is provided, a coaxial plug 12a serving as the input terminal 12 is provided at one end, and an output is provided at the other end. A coaxial connector 24a serving as the terminal 24 is provided. The coaxial connector provided to connect the coaxial cable connected to the antenna to the antenna terminal of the conventional analog receiver is directly connected to the coaxial plug 12a, and the coaxial connector 24a is used for connecting the antenna of the receiver. It is configured to connect directly to a coaxial plug or to an analog receiver via a coaxial cable.

By so connecting the apparatus of FIG. 3,
A viewer can receive a digital broadcast as if he or she received an analog broadcast by simply selecting the channel without modifying the conventional analog broadcast receiver. FIG. 4 shows another embodiment of the terrestrial broadcast signal converting apparatus according to the present invention, and the portions denoted by the same reference numerals as those in FIG. In FIG. 4, a portion different from FIG. 1 is near the antenna input terminal. When a plurality of transmitting antennas of a broadcasting station are scattered, it is necessary to install receiving antennas in the directions of the respective broadcasting antennas. In FIG. Shows.

In order to correspond to the receiving antenna 41, a new input terminal 42 is added, and the outputs of the respective input terminals 12 and 42 are accordingly divided into two by the dividers 13 and 43, and one output of each is provided. The mixer 44 mixes them into a broadcast signal for the tuner 14, and the other outputs of the distributors 12 and 43 are mixed by the mixer 45 and output to the filter 15. With this configuration, it is possible to perform processing in the same manner as described with reference to FIG. 1 regardless of the broadcasting signal supplied from any antenna, and the conventional analog broadcasting receiver also receives digital broadcasting. It will be possible.

As described above, the terrestrial broadcast conversion apparatus of the present invention has the minimum necessary configuration for converting a digital broadcast signal into an analog broadcast signal, and by combining it with a conventional analog broadcast receiver, The viewer can receive the digital broadcast by simply operating the analog receiver, and thus it is possible to provide a device satisfying both economical efficiency and operability.

FIG. 5 shows another embodiment of the present invention.

In the apparatus shown in FIGS. 1 and 4, the channel of the digital broadcast is known in advance, the tuner is preset to select the channel, and the RF is further set.
An example in which the modulator 20 and the filter 15 are also set to correspond to the channel is shown, and when the channel of the digital broadcast is unknown or the digital broadcast is performed on a plurality of channels, It includes the problem that it is difficult to deal with it completely.

The apparatus shown in FIG. 5 can cope with a case where a digital broadcast is broadcast on a plurality of channels or a case where the digital broadcast channel is not known.

5, parts having the same functions as those of the device shown in FIG. 1 are denoted by reference numerals, and detailed description thereof will be omitted.

The apparatus shown in FIG. 5 is provided with a channel selection unit 51 for executing channel switching of the tuner 14 and a control unit 52 for controlling the channel selection unit 51, and a control unit 52 from the outside.
It has an input unit 53 for controlling the channel selection unit 51 via the.

The input section 53 is configured to receive a remote control signal from a remote control hand unit provided in, for example, an analog receiver and output a control signal for causing the tuning section 51 to execute channel switching of the tuner 14. Has been done.

Further, the RF modulator 54 is set so as to selectively generate broadcast signals of all channels in the UHF band, and a gate section 55 is provided in place of the filter 15 shown in FIGS. 1 and 4. Has been. The control unit 52 uses R
The control signal for setting the channel of the analog broadcast signal output from the F modulator 54 and the control signal for switching the gate unit 55 are output.

Further, a discriminator 56 for discriminating whether or not the channel received by the tuner 14 is a digital broadcast based on the TS signal outputted from the OFDM demodulation / error correction unit 16 is provided, and the discrimination result is provided by the control unit. 52.

When the channel received by the tuner 14 is a digital broadcast, the control unit 52 turns off the gate unit 55 based on the discrimination result of the discriminator 56 and turns the distributor 13 on.
From the broadcast signal to the mixer 25, and outputs a control signal to the RF modulator 54 so as to generate a broadcast signal having the same channel frequency as the digital broadcast. As a result, the digital broadcast received by the tuner 14 is converted into an analog broadcast, and the mixer 25 outputs the analog broadcast.
It is led to the terminal 23 via 2 and outputted from the output terminal 24.

When the channel received by the tuner 14 is an analog broadcast, the control unit 52 turns on the gate unit 55 based on the discrimination result of the discriminator 56 and operates the RF modulator 54. Stop. As a result, the analog broadcast signal from the distributor 13 is supplied to the mixer 25, guided to the terminal 23 via the amplifier 22, and output from the output terminal 24. Since the mixer 25 is not supplied with two broadcast signals at the same time, it may be configured with a circuit having a simple OR circuit function.

The apparatus shown in FIG. 5 is structured as shown in FIG. 6, for example. In FIG. 6, as compared with FIG. 3, an input unit 53 is newly provided on one side surface of the housing 26, and the coaxial plug 12a and the coaxial connector 24a together with the power cord 30 are provided on the side opposite to the input unit 53. It is provided on the side of. In order to actually use the device shown in FIG. 6, as shown in FIG. 7, it is arranged so that the remote control signal of the analog receiver can be received, for example, it is placed on the upper part of the housing of the analog receiver 70. It is possible to
Of course, the coaxial cable from the antenna is the coaxial plug 1
2a, the coaxial connector 24a and the antenna terminal of the receiver are connected by a coaxial cable.

FIG. 8 shows a circuit block of the analog receiver 70 in a simple manner. The antenna terminal 81 is connected to a tuner 82, and the video signal is demodulated from the tuner 82 via a video signal demodulation / video signal processing / output unit 83. A signal is output and C
Displayed by RT84. The audio signal from the tuner 82 is intercarrier detection / audio demodulation / output unit 8
5, and is output by the voice output means 86 such as a speaker.

The tuner 82 is also connected to a channel selection section 87, a control section 88 for controlling the channel selection section 87, and an input section 89 for receiving a remote control signal. The signal is received by the input unit 89, decoded, and supplied to the control unit 88, whereby the channel selection unit 87 is controlled and the reception channel of the tuner 82 is switched.

The input section 53 of the apparatus shown in FIGS. 5 and 6 receives the remote control signal from the hand unit 90 of FIG. 8, and the tuner 14 is the same as the tuner 82 of the analog receiver via the control section 52 and the tuning section 51. Set to perform channel switching operation.

As a result, when the selected channel is digital broadcasting, the converted analog broadcasting signal is supplied from the output terminal 24 of the terrestrial broadcasting signal converter to the analog receiver through the antenna terminal 81. Since the channel is selected by the tuner 82, the viewer can receive the digital broadcast without any troublesome operation. When the receiving channel is analog broadcasting, the broadcasting signal that has substantially passed through the terrestrial broadcasting signal conversion device is supplied to the antenna terminal 81, so that the broadcasting can be received without any trouble.

FIG. 9 is a flow chart for explaining the operation of the apparatus shown in FIG.

It is determined whether the channel started in step 9a and received in step 9b is digital broadcasting,
If it is a digital broadcast, the gate portion to which the broadcast signal is supplied is closed in step 9c, the digital broadcast signal received in step 9d is converted into an analog broadcast signal and output,
The process ends in step 9e.

If the channel received in step 9b is an analog broadcast, the operation of the RF modulator for generating an analog broadcast signal is stopped in step 9f, and the gate is opened to open the broadcast signal from the antenna in step 9g. Is output to the output terminal substantially as it is, and the process ends.

As described above, according to the present embodiment, in an environment in which analog broadcasting and digital broadcasting are mixed, a broadcasting signal of a channel on which digital broadcasting is performed is converted into an analog broadcasting signal of the same channel and output. However, since it is possible to provide a conversion device that directly outputs the analog broadcast signal as it is, the viewer can receive the digital broadcast simply by operating the analog receiver, and in the future, all the digital broadcasts will be converted to the digital broadcast. Even if it is switched, the digital broadcast can be viewed as it is with the analog receiver, and the extremely economical receiving equipment can be provided.

[0044]

As described above, according to the present invention,
In an environment where analog broadcasting and digital broadcasting are mixed,
Since the digital broadcast is converted to analog broadcast on the same channel and output, and the analog broadcast signal is output substantially as it is, it provides a device that can receive digital broadcast only by switching the channel of the analog receiver. Is what you can do.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a terrestrial broadcast signal conversion device according to the present invention.

FIG. 2 is a characteristic diagram for explaining the operation of the device shown in FIG.

FIG. 3 is a configuration diagram of a housing in which the device shown in FIG. 1 is incorporated.

FIG. 4 is a block diagram showing another embodiment of the terrestrial broadcast signal conversion device according to the present invention.

FIG. 5 is a block diagram showing still another embodiment of the terrestrial broadcast signal conversion device according to the present invention.

6 is a configuration diagram of a housing in which the device shown in FIG. 5 is incorporated.

7 is a configuration diagram showing a state in which the housing shown in FIG. 6 and an analog receiver are combined.

FIG. 8 is a block diagram of an analog receiver used in combination with the apparatus shown in FIG.

9 is a flow chart for explaining the operation of the device shown in FIG.

[Explanation of symbols]

11, 41 ... Antenna 12 ... Input terminal 23 ... Terminal 24 ... Output terminal 25 ... Electromagnetic shield housing 26 ... Housing

Claims (9)

[Claims] 1. An input terminal to which broadcast signals of a plurality of channels including analog terrestrial broadcasting and digital terrestrial broadcasting are supplied, and a baseband for receiving a digital broadcasting channel of the broadcasting signals supplied to the input terminals. The processing means for generating the video signal and the audio signal, the generating means for generating the analog broadcasting signal having the frequency of the predetermined channel from the video signal and the audio signal generated by the processing means, and the input terminal. A multiplexing unit for limiting the frequency band of the broadcast signal of the analog broadcasting channel to be multiplexed with the generated analog broadcasting signal; and an output terminal to which an output of the multiplexing unit is supplied. Terrestrial broadcast signal converter. 2. The terrestrial broadcast signal conversion apparatus according to claim 1, wherein the multiplexing unit includes a band limiting filter that limits a frequency band of the broadcast signal of the generated analog broadcast channel. 3. The terrestrial broadcast signal conversion apparatus according to claim 1, wherein an electromagnetic shield is provided between the input terminal and the output terminal. 4. The generated analog broadcast signal is generated as a broadcast signal of the same channel as the digital broadcast.
The terrestrial broadcast signal conversion device according to any one of 1. 5. The terrestrial broadcast signal conversion device according to claim 1, wherein the input terminal receives terrestrial broadcast signals from a plurality of antennas. 6. The input terminal has a first input terminal connected to a first antenna and a second input terminal connected to a second antenna, and further, two outputs of each input terminal are provided. 2. The terrestrial broadcast signal conversion device according to claim 1, wherein the terrestrial broadcast signal conversion device is configured to be mixed by the above and supplied to the processing means and the multiplexing means. 7. An input terminal to which broadcast signals of a plurality of channels including analog terrestrial broadcasting and digital terrestrial broadcasting are supplied, a distributor for distributing the broadcasting signal input to the input terminal to at least two outputs, One of the output terminals of the distributor is connected, and a digital tuner set to select the channel of the digital terrestrial broadcasting, and the other one of the output terminals of the distributor are connected, the digital terrestrial broadcasting Filter means for limiting the passage of the frequency band component of the channel, processing means for obtaining a baseband video signal and an audio signal from the digital terrestrial broadcast signal of the channel selected by the tuner, and the baseband video signal And conversion means for converting an analog broadcast signal having a broadcast frequency of the digital terrestrial broadcast channel based on an audio signal. Multiplexing means for multiplexing the output of the converting means and the output of the filter means and outputting to an output terminal, an analog tuner for receiving a broadcast signal output from the output terminal, and broadcasting of a channel received by the analog tuner. A terrestrial broadcast signal receiving apparatus comprising: a reception signal processing unit that generates and outputs a baseband video signal and an audio signal from a signal. 8. The terrestrial broadcast signal receiving apparatus according to claim 7, wherein the filter means, the processing means, the converting means, and the mixing means are covered by a single shield case. 9. A first tuner for receiving a broadcast signal of a plurality of channels, which includes an analog broadcast signal and a digital broadcast signal and is supplied from an antenna to an input terminal, and a first tuner for switching a reception channel of the first tuner. Channel selecting means, converting means for converting the broadcast signal of the digital broadcast received by the first tuner into an analog broadcast signal of the same channel, and whether the channel received by the first tuner is a digital broadcast channel. A discriminating means for discriminating whether or not, based on the discrimination result of the discriminating means, the output of the converting means is derived to an output terminal in the case of digital broadcasting, and the broadcast signal supplied to the input terminal in the case of not digital broadcasting Output control means for deriving the signal to the output terminal through a path that does not pass through the tuner, and receiving a broadcast signal output from the output terminal A receiver having a second tuner, a second tuning unit provided in the receiver for switching a receiving channel of the second tuner, and the first and second tuning units commonly controlled Then, the terrestrial broadcast signal receiving apparatus is provided with channel switching control means for switching the channels so that the first and second tuners receive the same channel.