JPH0613846A - Broadcast receiver - Google Patents

Abstract

PURPOSE:To automate the input switch processing and to simplify the receiving operation by a user by deciding the specific one of frequency bands that includes a designated frequency based on the designated reception frequency value and the frequency value showing each frequency band. CONSTITUTION:A user designates a reception frequency with operation of a prescribed key of an operating part 44. In regard of a reception input enable frequency band for a DSR receiver 30, a controller 43 compares the data on the cable input frequency band and the satellite antenna input frequency band with the data stored in an internal ROM. So that it can be decided whether the frequency inputted by the user is included in a cable input signal frequency band or a satellite antenna input signal band. If the signal is included in the cable input signal band, a switch circuit 36 is connected to a contact C and a cable frequency converter 35 receives the designated frequency. If the signal is included in the satellite antenna input signal band, the circuit 36 is connected to a contact S and a satellite frequency converter 34 receives the designated frequency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast receiver for receiving broadcast such as voice.

[0002]

2. Description of the Related Art For example, many radio receivers are capable of receiving broadcast signals in different frequency bands. For example, both AM broadcasting and FM broadcasting can be received. However, since the demodulation processing method is different between AM broadcasting and FM broadcasting, it is not necessary to select the input signal in the preceding stage of the demodulation circuit section and supply the received input signal to the same demodulation circuit section. However, it is possible to receive broadcast signals in different frequency bands, and in the same receiver for which the demodulation processing method is the same for broadcast signals in each frequency band, for example, the received signal is converted to a specific intermediate frequency signal. After that, the configuration of the receiver can be simplified by supplying it to one demodulation circuit section via the input switching section.

A digital satellite radio broadcasting (hereinafter referred to as DSR) system has been developed as one of the broadcasting systems using such a plurality of frequency bands. D
In the SR system, 16 channels of broadcast signals of digital data from a plurality of broadcasting stations (for example, 16 stations for stereo broadcasting or 32 stations for monaural broadcasting) are time-division-multiplexed, and then QPSK modulation processing is performed.
Output to broadcasting satellite at z band frequency.

Radio waves from a broadcasting satellite are received by a central receiving station (for example, a CATV station) or a satellite broadcasting antenna individually installed in each home or the like, and supplied to a DSR receiver via a broadcasting cable or directly from the satellite broadcasting antenna. Done, DS
The R receiver receives and demodulates and outputs a radio broadcast sound.

Since the broadcast signals from, for example, 16 broadcasting stations are multiplexed at one reception frequency (hereinafter referred to as frequency block) as described above, only selection (tuning) of frequency blocks is performed in the DSR receiver. Instead, one digital broadcast signal can be selected (tuned) from the received digital broadcast signals of 16 stations, and the user can perform the tuning operation and the tuning operation. You can listen to the broadcast of.

[0006] In this DSR system, together with broadcast audio data, data indicating the type (news, sports, rock music, classical music, etc.) of each broadcast content in each digital broadcast signal to be multiplexed (hereinafter, Program type information), data indicating the type of stereo broadcasting / monaural broadcasting / sound multiplex broadcasting (hereinafter referred to as channel mode information), and data indicating music broadcasting or audio broadcasting such as conversational sound (hereinafter referred to as M). / S mode information) is added,
In the DSR receiver, various receiving operation control can be performed using these information.

[0007]

Here, the DSR receiver is provided with at least two reception input terminals so that the broadcast signal can be input through the broadcast cable as described above, and the satellite broadcast antenna is used. Broadcast signals can be input directly (although the frequency is converted by a frequency converter). The frequency band of the input signal from the broadcasting cable is 50 to 855MHz, while the input signal from the satellite broadcasting antenna is the signal of 12GHz band which is input by the frequency converter in the band of 950 to 1750MHz.

Since the cable input signal and the antenna input signal have the same modulation method, they are selectively converted to the same demodulation processing unit (QPSK demodulation unit) via the input switching circuit after being converted to an intermediate frequency of 40 MHz, for example. Should be supplied to.

However, for the user, when receiving,
First, an input switching operation is performed depending on whether it is a cable input or an antenna input to select an input signal, and a reception frequency operation key is used to select a reception frequency block.
There is a problem that the operation is troublesome because two-step operation is required. Of course, the DSR receiver must be provided with an input switching operation section, which is uneconomical. In particular, in the case of a DSR receiver, since 16 channels are multiplexed in the received signal, it is necessary to perform channel selection operation after designating the reception frequency, which makes the operation complicated.

[0010]

In view of the above problems, the present invention has an input switching means for selectively selecting a plurality of received signal inputs of different frequency bands and supplying them to one demodulation processing system. It is an object of the present invention to automate the input switching process and to simplify the receiving operation of the user in the broadcasting receiver equipped with.

That is, in the broadcast receiver, it is determined whether or not the frequency designating means for designating the reception frequency and the frequency designated by the frequency designating means are included in any of a plurality of frequency bands in which input is possible. The input switching means is controlled to be switched based on the discrimination information so that the received signal input of the corresponding frequency band is supplied to the demodulation processing system.

In particular, the frequency designating means is constructed so that a desired frequency value can be designated by the numeral input operation section. The received signal inputs of a plurality of different frequency bands supplied to the input switching means are a broadcast signal transmitted and input by a broadcast cable and a broadcast signal received by a satellite receiving antenna and input through a converter. Applies to cases.

[0013]

[Operation] If the reception frequency is specified by the user,
Even without using input switching control data or the like, it is possible to determine from the frequency value and the frequency value indicating each frequency band whether the specified frequency is included in the plurality of frequency bands. You can

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a DSR system and a transmission data structure will be described, and then a DSR receiver according to an embodiment of the present invention will be described.

FIG. 6 shows an outline of the DSR system, and 1a to 1u show 16 broadcasting stations by stereo broadcasting. Each of the broadcasting stations 1a to 1u converts broadcast audio into digital data of quantized 16-bit linear PCM at a sampling frequency of 32 KHz, and then compresses it into 14 bits by quasi-instantaneous companding processing and outputs it. Further, various information such as program type information, channel mode information, M / S mode information, and error correction code are added as output data.

The 14-bit digital broadcasting signal output from each broadcasting station 1a-1u is sent to the transmitting station 3 by the public line 2, for example. 16 was supplied at transmitting station 3
Time division multiplexing processing unit 4 for digital broadcasting signals of channels
In step 1, a multiplexing process is performed to generate an I signal in which 8 channels are multiplexed and a Q signal in which 8 channels are multiplexed. The I signal and the Q signal are supplied to the QPSK modulation processing unit 5, and a QPSK modulation signal having a bandwidth of 15 MHz, for example, is output. The QPSK modulated signal is transmitted to the transmitting antenna unit 6
To be transmitted to the satellite 7.

The configurations of the time division multiplexing processing unit 4 and the QPSK modulation processing unit 5 are shown in FIG. 4a and 4b are switching multiplexing circuits, and the switching multiplexing circuit 4a includes broadcasting stations 1a to 1h.
That digital broadcast signal of the channel ch1~ch8 from are supplied to the contact T ₁ through T _8, respectively, the digital broadcast signal of 8 channels by connection of the contact T ₁ through T ₈ are sequentially switched at a predetermined timing It is multiplexed to generate an I signal.

That is, as shown in FIG. 8A, channel c
on the digital broadcast signal data h1~ch8 that is supplied to the contact T ₁ through T ₈ each 1 / 32KHz, 1 / 256KHz
By switching at each timing, FIG.
A multiplexed I signal is generated as shown in (b).

On the other hand, the switching multiplexing circuit 4b includes a broadcasting station 1
Digital broadcasting signals from i to 1u, that is, channels ch9 to ch16 are respectively supplied to the contacts T _{9 to} T ₁₆ , and similarly, the connection of the contacts T _{9 to} T ₁₆ is sequentially switched at 1/256 KHz timing. , As shown in FIG. 8C, a Q signal is generated by multiplexing digital broadcast signals of 8 channels.

As shown in FIG. 7, the I signal is QPS.
In the K modulation processing unit 5, it is supplied to the I multiplier 5c via the low pass filter 5a. Further, the Q signal is supplied to the Q multiplier 5d via the low pass filter 5b. Furthermore I
The multiplier 5c is supplied with the carrier of the predetermined frequency output from the carrier generation unit 5e, and the Q multiplier 5d is 90 ° phase-shifted by the phase shifter 5f with the carrier of the predetermined frequency output from the carrier generation unit 5e. Has been supplied. Therefore, the outputs of the I multiplier 5c and the Q multiplier 5d are output from the mixer 5
By being mixed with g, a so-called QPSK (quadrature phase shift keying) modulated signal is obtained.

As shown in FIG. 6, the 12 GHz band signal transmitted via the satellite 7 is received by a common receiving facility such as a CATV station 8 or a satellite broadcasting receiving antenna individually installed in each home or the like. 9 received.

The DSR signal received by the CATV station 8 is assigned to a predetermined channel frequency and transmitted by a so-called broadcasting cable 11 together with cable TV broadcasting, FM broadcasting and the like, and is supplied to, for example, a DSR receiver 30 in each home. The frequency band of the signal transmitted by the broadcasting cable 11 is 50
.About.860 MHz, and one frequency block of the DSR signal uses the band of 118 MHz. In addition, the 12 GHz band DSR broadcast signal received by the satellite broadcast receiving antenna 9 is transmitted by a low noise converter (LNC) 10
Converted to the 1st intermediate frequency of ~ 1750MHz, DSR receiver 3
Input to 0.

The transmission data structure as I and Q signals of such a DSR broadcast signal will be described with reference to FIG. I signal,
As described above, each of the Q signals is a multiplexed broadcast signal of 8 channels. As shown in FIGS. 9 (a) and 9 (f), 320 bits (1/32 KHz) of one unit of the main frames M _A and M _{B, respectively.} Is formed.

The first 11 bits of the mainframes M _A and M _B are assigned to the mainframe synchronization signal SW, and the subsequent 1 bit is a service bit SSB. In the mainframe M _A , the service bits SSB are followed by 77-bit data blocks DB _{1 to} DB _{4 respectively.}
Is provided. Broadcasting signals of two channels at a time as shown in FIG. 9, respectively in each data block _{DB 1 ~DB 4 (b) ~} (e) are assigned.

That is, from the beginning in the data block DB ₁ ,
The upper 11 bits of the 14-bit L signal of the first channel ch1, the upper 11 bits of the R signal, and the second
Higher 11 of 14-bit L signal of channel ch2
Similarly, the upper 11 bits of the R signal are assigned, and subsequently, 19 check bits are added. The 63 bits form a BCH code for error correction.

Subsequently, additional bits Z ₁ and Z ₂ are provided for each of the first and second channels, one bit at a time. After that, the lower 3 bits of the 14-bit L signal of the first channel ch 1 and the R signal are also provided. Lower 3 bits of
The lower 3 bits of the 14-bit L signal of the second channel ch2 and the lower 3 bits of the R signal are allocated to form a 77-bit data block DB ₁ .

In the same manner, the data block DB ₂ has the information of the third and fourth channels ch3 and ch4, the data block DB ₃ has the information of the fifth and sixth channels ch5 and ch6, and the data block DB ₄ has the same information. Each data block is formed by the information of the seventh and eighth channels ch7 and ch8. The same applies to the main frame M _B of the Q signal, and although not shown, each of the data blocks DB _{5 to} D ₅
Channel B including check bits etc. in B ₈
Information of h9 to ch16 is assigned.

Here, the service bit SSB is provided only for one mainframe (M _A , M _B ), but the DSR receiver 30 collects the service bit SSB supplied every 1/32 KHz. A service frame as shown in FIG. 10 is formed. In each broadcast of 16 channels received by this service frame,
Program type information PTY described above, channel mode information CM for discriminating stereo / monaural / audio multiplex,
M / S mode information MS for discriminating music / speech is discriminated.

_A service block having information for two channels is formed as shown in FIG. 10A by the 64-bit service bit SSB extracted from the continuous 64 units of the main frame M _A.

The leading 16 bits of the service block are the sync word SY _1, and the service information PA is added to the following 48 bits. That is, as shown in FIG. 10B, the service information PA (L
ch1), also service information PA (Rch
1), service information PA (Lch2) for the L signal of the second channel ch2, and service information PA (Rch2) for the R signal are allocated for each 8 bits.
The remaining 16 bits X ₁ and X ₂ are reserved bytes.

Following the service blocks corresponding to the channels ch1 and ch2, similarly, in the service frame, the sync words SY (SY _{2 to} SY ₈ ) and the service information PA are used to set channels ch3 and ch4 to.
Service blocks corresponding to the channels ch15 and ch16 are formed.

The 8-bit service information PA is shown in FIG.
4-bit program type information PT as shown in (c)
Y, 1-bit M / S mode information MS, 2-bit channel mode information CM, and parity 1 bit. 16 types of broadcast content types are recorded by the 4-bit program type information PTY. For example, news, current affairs programs, information programs, sports, education, dramas,
The types are culture, science, pop music, rock music, MOR music, classical music, and the like.

As the M / S mode information MS,
If it is "1", it is determined as music, and if it is "0", it is determined as speech. Further, when the channel mode information CM is, for example, “00”, it is a monaural broadcast, but when the first channel ch1 is a stereo broadcast, for example, the service information PA (Lch1) for the L signal and the service information for the R signal. Each channel mode information CM in PA (Rch1) is used, and if each is “01” or “01”, so-called audio multiplex broadcasting by independent monaural audio,
If it is "01" or "10", it is determined to be an L, R stereo broadcast.

The configuration of the DSR receiver 30 of this embodiment corresponding to such a DSR broadcasting system will be described with reference to FIGS. In FIG. 2, 31 is an antenna input terminal,
The satellite broadcast receiving antenna 9 receives the DSR received signal via the LNC 10. The LNC 10 includes an oscillator 10a, a local oscillator 10b, a mixer circuit 10
The signal of the 12 GHz band is the first of 950 to 1750 MHz.
Converted to intermediate frequency. On the other hand, 32 is a cable input terminal to which a DSR reception signal of 50 to 860 MHz is input.

DSR reception signals from the input terminals 31 and 32 are supplied to the high frequency section 33. The DSR reception signal from the antenna input terminal 31 is input to the satellite frequency converter 34, and the second intermediate frequency of 479.5MHz and the third frequency of 40MHz are input.
It is converted to an intermediate frequency and supplied to the S contact of the input switching circuit 36. Further, the DSR reception signal from the cable input terminal 32 is input to the cable frequency converter 35, and 40 MHz
It is converted to the intermediate frequency of z and supplied to the C contact of the input switching circuit 36.

The DSR received signal obtained from the satellite broadcast receiving antenna 9 or the broadcast cable 11 having an intermediate frequency of 40 MHz is supplied from the input switching circuit 36 to the QPSK demodulation section 37, where the QPSK demodulation processing is performed and the above-mentioned I It is demodulated and output as a signal and a Q signal.

The I signal and the Q signal in the formats of the main frames M _A and M _B are discriminated by the main frame synchronizing signal SW in the decoder 38, subjected to error correction and decoding processing, and out of 16 channels which are time division multiplexed. A broadcast of a predetermined channel is selected and output. The selected digital broadcast signal is digitally output from the output terminal 39 to other devices, and L, R is transmitted via the digital filter 40 and the D / A converter 41.
Audio amplification / output from the output terminal 42 as an analog audio signal
It is supplied to the output circuit unit or another device and is output as a broadcast sound by a speaker. Further, the decoder 38 supplies the service bit SSB extracted from the main frames M _A and M _B to the controller 43.

Reference numeral 43 is a controller for controlling various operations of the DSR receiver, which is composed of a microcomputer. 43M is an internal data RAM that stores data used for control operation. The controller 43 uses the satellite frequency converter 34 and the cable frequency converter 3 as control signals for the respective circuit units in the high frequency unit 33.
5, a reception frequency (block selection) control signal and a switching control signal to the input switching circuit 36 are output.

Further, the controller 38 sends a channel selection control signal to the decoder 38 to specify a channel to be selected. In addition, a service frame is generated from the service bit SSB supplied from the decoder 38, and information on each of the 16 channels is obtained as described above.
Further, by supplying the synchronization detection information from the decoder 38, it is determined whether or not the reception operation is properly performed. Further, the digital filter 40 is controlled to select a filter coefficient.

Reference numeral 44 denotes an operation unit provided for user operation, 4
Reference numeral 5 indicates a display unit. The front panel of the DSR receiver provided with the operation unit 44 and the display unit 45 is shown in FIG. The operation unit 44 includes a power key 50, 16 program type selection keys 51, 16 channel selection keys 52 (numerical keys 1 to 16), an up / down key 53 for designating a reception frequency block, and a direct frequency. A frequency / clear key 54 for inputting or deleting registered settings, a monaural mode key 55 for selecting an output state for monaural broadcasting, an up / down key 56 for adjusting a reception frequency, and an M / S mode setting Music balance key 57, speech balance key 58, and memory key 5 for storing the received frequency block
9 is provided. Further, a display mode key 60 for switching the display, a direct frequency input operation key 6
1, LNC power key 62 and the like are provided. Operation information by these keys is input to the controller 43, and the controller 43 controls each unit according to the operation information.

The user uses the up / down key 53 to select a reception frequency block preset in the data RAM 43M, for example. Or direct frequency input operation key 61 and number key (channel selection key) 5
2, and the frequency / clear key 54 is used to specify the reception frequency. Then, the controller 43 controls the high frequency unit 33 to perform the receiving operation at the designated frequency. In addition, for the setting registration of the reception frequency block, the frequency can be specified with the up / down keys 53, 56, etc.
Run with 9. For example, 20 reception frequency blocks can be registered in the data RAM 43M. In addition, the contents of the registered data include the reception frequency and the LN.
The power supply voltage value to C10 is also included.

The controller 43 also selects an output channel from the 16 received channels based on the user's operation of the channel selection key 52, and the decoder 38
Control the output of.

When the program type is selected by the program type selection key 51, the controller 43 discriminates the broadcast channel corresponding to the program type from the above-mentioned service frame, and automatically determines this, for example, the channel having the smallest channel number. Tune in. When there are a plurality of channels of the corresponding program type among the 16 channels currently being received, pressing the same program type selection key 51 selects channels of the corresponding program type in ascending order of channel number. To go.

Further, by operating the M / S mode keys 57 and 58, the user can set the volume ratio in the music mode and the speech mode, and the controller 43 sets the M / S for the selected channel.
The output volume control is set based on the / S mode discrimination.

Further, as the display unit 45, a display area 64 formed of, for example, a liquid crystal panel is provided, and various operating conditions are displayed under the control of the controller 43. Display area 6
The display contents of No. 4 are shown in FIG. That is, the block number display section 65 of the frequency block being received, the channel number display section 66 of the selected channel, numerical values and character information such as the reception frequency (for example, the name of the broadcasting station or the name added to the registered frequency block). Dot display section 6 for displaying
7, a signal level display unit 68, and a channel presenting unit 69, etc., for displaying, for example, lighting the channels corresponding to the program type designated as described above, corresponding to the 16 channels in the reception frequency block. .

Also, a stereo / monaural channel mode display section 70, an M / S mode display section 71, a tuning-on display section 72 that lights up to indicate a reception state when proper tuning is performed, and a deviation of reception frequency. And frequency up / down instruction display portions 73a and 73b for displaying.

In the DSR receiver of the present embodiment constructed as described above, the up / down key 53, or the direct frequency input operation key 61, the numeric key (channel selection key) 52, and the frequency / clear key 54 are operated. FIG. 1 shows the control operation by the controller 43 when the user designates the reception frequency by utilizing it.

When the user specifies the reception frequency by the above operation, the controller 43 first discriminates the input frequency (F101 → F102). Since the controller 43 holds the data of the frequency band of the cable input (50 to 855MHz) and the frequency band of the satellite antenna input (950 to 1750MHz) as the frequency band that can be received and input in the DSR receiver, for example, in the internal ROM. By comparing with the data, it is possible to determine whether the frequency input by the user is the band of the cable input signal or the band of the satellite antenna input signal. If the input frequency value does not correspond to any of the above, no processing is performed.
(F102 → F101).

If the numerical value of the input frequency is included in the band of the cable input signal, the input switching circuit 36 is controlled to connect the C contact (F103), and then the cable frequency converter 35 is controlled. Then, the receiving operation with the designated frequency is executed (F104).

If the numerical value of the input frequency is included in the band of the satellite antenna input signal, the input switching circuit 3
6 is controlled to connect the S contact (F105), and then the satellite frequency converter 34 is made to perform the receiving operation at the designated frequency (F106).

By the controller 43 performing the above processing in response to the user's operation of designating the receiving frequency, the user does not need to perform the switching operation of the input switching circuit 36, and the receiving operation becomes very easy. Then, it is only necessary to select a desired channel from the 16 channels received thereafter. Further, since the numerical value of the input frequency itself becomes the contact selection determination data in the input switching circuit 36, it is not necessary to particularly store the contact selection data corresponding to the input frequency in advance. Correct input switching control is executed corresponding to not only the input operation but also the frequency input of any numerical value.

By the way, the cable frequency converter 35 in the DSR receiver is constructed, for example, as shown in FIG. That is, for the signal from the input terminal 32, the RF amplification unit 35a including a bandpass filter, an amplifier and the like
_{1, 35a 2, 35a 3,} 35a 4 are provided, signals of 50~110MHz, 110~220MHz signal, 220～470M
The Hz signal and the 470 to 855 MHz signal are amplified and output.

The RF amplifiers 35a ₁ , 35a ₂ ,
Outputs of the local oscillator 35c of 35a ₃ is supplied to the mixer 35b is taken out as an intermediate frequency signal of the signal of the predetermined frequency is 40 MHz, is output via the adder 35 g. Further, the output of the RF amplifier 35a _{4 and} the output of the local oscillator 35e are supplied to the mixer 35d, a signal of a predetermined frequency is taken out as an intermediate frequency signal of 40 MHz, and is output via an adder 35g. .

When the reception frequency control signal is supplied to the PLL control unit 35f from the controller 43 as, for example, serial data, the PLL control unit 35f first selects the RF amplifier in the band including the reception frequency, The operation is turned on, and the operations of the other three RF amplifiers are controlled to be turned off. Then, if the reception frequency is 50 to 470 MHz, the reception frequency is 470 to 470 from the local oscillator 35c.
If the frequency is 855 MHz, a local oscillator or 35e generates a local oscillation signal of a predetermined frequency to perform a reception operation.

That is, in the present embodiment, the PLL control section 35f, which is the control section of the cable frequency converter 35, performs input switching (selection of the RF amplification section) by substantially the same processing as in FIG. It will be done.

The present invention is not limited to the DSR receiver, and is provided with input switching means for selectively selecting a plurality of received signal inputs of different frequency bands and supplying them to one demodulation processing system. Widely applied in broadcasting receivers.
For example, it can be adopted as a television receiver, a satellite TV broadcast tuner, and a cable TV tuner. Of course DS
The configuration and processing method of the DSR receiver when adopted as the R receiver are not limited to those in the above embodiment.

[0057]

As described above, the digital broadcast receiver of the present invention discriminates which of a plurality of frequency bands the frequency designated by the frequency designating means is, and based on the discrimination information. Since the input switching means is controlled to be switched so that the received signal input of the corresponding frequency band is supplied to the demodulation processing system, the user does not need to perform the input switching operation, and the receiving operation is very easy. There is an effect that. Further, it is not necessary to provide an input switching operation section, and cost reduction can be realized.

[Brief description of drawings]

FIG. 1 is a flowchart of processing during a receiving operation in a DSR receiver according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a DSR receiver according to an embodiment.

FIG. 3 is a front view of the front panel of the DSR receiver of the embodiment.

FIG. 4 is a front view of the display unit of the DSR receiver of the embodiment.

FIG. 5 is a block diagram of a cable frequency converter in the DSR receiver of the embodiment.

FIG. 6 is a schematic explanatory diagram of a DSR system.

FIG. 7: Time division multiplexing and QP in DSR system
It is explanatory drawing of a SK processing part.

FIG. 8 is an explanatory diagram of time division multiplexing processing in the DSR system.

FIG. 9 is an explanatory diagram of a main frame structure of a transmission signal of the DSR system.

FIG. 10 is an explanatory diagram of a service frame structure transmitted in the DSR system.

[Explanation of symbols]

 30 DSR receiver 33 High frequency part 34 Satellite frequency converter 35 Cable frequency converter 36 Input switching circuit 37 QPSK demodulation part 38 Decoder 43 Controller 44 Operation part 45 Display part 52 Channel selection key (numerical key) 53 Up / down key 54 Frequency / clear Key 61 Direct frequency input operation key

Claims (3)

[Claims] 1. A broadcast receiver having input switching means for selectively selecting a plurality of received signal inputs of different frequency bands and supplying the same to one demodulation processing system, a frequency specifying means for specifying a receiving frequency. And, determining whether the frequency designated by the frequency designating means is a frequency included in any of the plurality of frequency bands, and switching control of the input switching means based on the discrimination information, the corresponding frequency band. And a control means for allowing the received signal input of (4) to be supplied to the demodulation processing system. 2. The broadcast receiver according to claim 1, wherein the frequency designating unit is configured so that a desired frequency value can be designated by a numeral input operation unit. 3. The reception signal input of a plurality of different frequency bands supplied to the input switching means includes a broadcast signal of a transmission frequency band of a broadcast cable and a frequency band of a frequency band down-converted by a satellite broadcast receiving antenna. The broadcast receiver according to claim 1, wherein the broadcast receiver is a broadcast signal.