JPH0613927A - Digital broadcast receiver - Google Patents

Abstract

PURPOSE:To improve the operability in the broadcast content type designation mode for a DSR receiver or the like. CONSTITUTION:This receiver consists of a control means which is able to discriminate and select a channel with a broadcast content designated by a content type designation means among plural broadcast signals received at a designated reception frequency based on content type information, and the control means is configured to switch the reception frequency into other frequency and to execute the reception when a channel of a content of broadcast designated by a content type designation means has just been not in existence or is not in existence in the channel received by the reception frequency during the execution of the reception by the reception frequency (F103 F107).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast receiver for receiving a broadcast of voice or the like by digital data.

[0002]

2. Description of the Related Art In recent years, transmission signals have been digitized, and broadcasting by digital signals has been realized. As one of such things, a digital satellite radio broadcasting (hereinafter referred to as DSR) system has been developed. DSR
In the system, multiple broadcasting stations (for example, one of stereo broadcasting)
Broadcast signals of digital data from 6 stations or monaural broadcasting stations (32 stations) are time-division-multiplexed, QPSK-modulated, and then output to a broadcasting satellite at a frequency of, for example, 12 GHz.

The radio waves from the broadcasting satellites 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 the DSR receiver is directly transmitted through the broadcasting cable or from the satellite broadcasting antenna. And is received and demodulated by the DSR receiver to output a radio broadcast sound.

Since, as described above, broadcast signals from, for example, 16 broadcast stations are multiplexed in one reception frequency channel (hereinafter referred to as frequency block),
The DSR receiver allows not only frequency block selection (tuning), but also selection (tuning) of one digital broadcast signal from the received digital broadcast signals of 16 channels. Is capable of listening to a desired broadcast by executing a tuning operation and a tuning operation.

Further, 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 multiplexed digital broadcast signal (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.

[0006]

In such a DSR receiver, automatic channel selection control is performed using the program type information. For example D
When the user specifies the desired program content, for example, "news", by operating means provided in the SR receiver, the 16 channels received by the DSR receiver are automatically searched for a broadcasting channel that is broadcasting the news, It is a process of selecting a channel and outputting it.

By the way, the program content type is changing on a program-by-program basis. For example, if a music program is broadcast after the end of a news program, the channel does not correspond to the program type specified by the user. Therefore, in such a case, it is determined whether or not there is a channel in the program broadcast of the designated program type among the 16 stations that are being received, and if there is, it is automatically switched to that channel. Such processing is performed.

[0008] However, when the program broadcasting channel of the designated program type no longer exists, the channel cannot be changed as it is because proper channel selection processing based on the designated program type cannot be executed.
Also, in this case, if the channel selection processing is performed properly regardless of the program type, the user can grasp the operating status because other types of programs are output even though the program type is specified. There is a problem that it does not exist or the operation is confused.

Further, even if there is a channel broadcasting a program of the corresponding program type on a channel received at another reception frequency, the user cannot notice it and cannot listen to it. Alternatively, there is a problem that the broadcast cannot be heard unless a complicated operation of switching the reception frequency and then performing a program type designation operation again to search for a channel.

[0010]

In view of the above problems, the present invention has a plurality of digital broadcast signals multiplexed in one frequency block, and at least broadcasts as additional information corresponding to each digital broadcast signal. An object of the present invention is to improve operability associated with program type designation in a digital broadcast receiver that receives a digital broadcast in which content type information is transmitted together with a digital broadcast signal.

That is, as a digital broadcast receiver, frequency designating means for designating a reception frequency (frequency block),
A content type designating means for designating a broadcast content type and a reception operation at a designated receiving frequency, and a designated broadcast (program) content is selected from a plurality of digital broadcast signals in a received frequency block. The digital broadcasting is provided with a control unit capable of controlling so as to be discriminated and selected based on the broadcast content type information.

[0012] In particular, the control means receives by the reception frequency designated by the frequency designating means or by the reception frequency when the control means performs the receiving operation at the reception frequency designated by the predetermined processing. When there is no digital broadcast signal of the broadcast content designated by the content type designating means in the digital broadcast signal, the reception frequency is automatically switched to another frequency and the reception operation is executed.

Further, the control means is a digital broadcasting signal received by the reception frequency designated by the frequency designating means or the reception frequency designated by the control means by a predetermined process when the receiving operation is executed. If there is no digital broadcast signal of the broadcast content designated by the content type designating means, the receiving frequency is switched to another frequency and the receiving operation is executed.

Further, the control means provides an informing means capable of informing the change of the reception frequency when the reception operation is executed by changing the reception frequency without being specified by the user using the frequency specifying means. Set up.

[0015]

[Operation] Broadcast content type (program type)
When the designation is made, if the digital broadcast signal channel corresponding to the designation does not exist in the currently received digital broadcast signal, or if it does not exist, the reception frequency should be automatically switched. For example, it is possible to search for a corresponding program type from the digital broadcasting signal at the new reception frequency and control it for tuning. In addition, when the reception frequency switching process that is not based on the user's operation of the frequency designating unit is executed in this way, the user can confirm the operating state by notifying the user of the fact by the notifying unit.

[0016]

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. 5 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 via 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 structures 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. 7A, 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 performing 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. 7C, a Q signal is generated by multiplexing digital broadcast signals of 8 channels.

As shown in FIG. 6, 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 output of the I multiplier 5c and the Q multiplier 5d is the mixer 5g.
By mixing in, a so-called QPSK (quadrature phase shift keying) modulated signal is obtained.

As shown in FIG. 5, 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, etc., 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. The DSR broadcast signal received by the satellite broadcast receiving antenna 9 is 950 to 1750 MHz by the low noise converter (LNC) 10.
Is converted into the first intermediate frequency of and input to the DSR receiver 30.

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, the Q signal is a multiplexed 8 channel broadcast signal. As shown in FIGS. 8 (a) and 8 (f), 320 bits (1/32 KHz) each represents one unit of the main frames M _A and M _B. 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 main frame M _A , 77-bit data blocks DB _{1 to} DB ₄ are provided following the service bit SSB. Broadcasting signals of two channels at a time as shown in FIG. 8, 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 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 ch1 and the R signal are also added. 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.

[0030] Here, the service bits SSB one mainframe (M _A, M _B) is not only one bit is provided, in DSR receiver 30, the service bits SSB supplied at every 1 / 32KHz are collected , A service frame as shown in FIG. 9 is formed. In each broadcast of 16 channels received by this service frame, the above-mentioned program type information PTY, channel mode information CM for discriminating stereo / monaural / voice multiplexing, M / S for discriminating music / speech The mode information MS is determined.

As shown in FIG. 9A, a service block having information for two channels is formed by the 64-bit service bits SSB extracted from the continuous 64 units of the main frame M _A.

The _first 16 bits of the service block is the sync word SY _1, and the service information PA is added to the following 48 bits. That is, as shown in FIG. 9B, service information PA (Lch for the L signal of the first channel ch1
1), also service information PA (Rch1) about R signal,
Service information PA (Lch2) for the L signal of the second channel ch2, and service information PA for the R signal as well.
(Rch2) is allocated for each 8 bits. The remaining 16 bits X ₁ and X ₂ are reserved bytes.

[0033] Following the service block corresponding to the channel ch1, ch2, similarly in the service frame, the sync word SY (SY ₂ ~SY ₈₎ and service information PA, channel ch3, Ch4～
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 1
0c, which converts the 12 GHz band signal to the first intermediate frequency of 950 to 1750 MHz. 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 reception signal obtained from the satellite broadcasting reception antenna 9 or the broadcasting 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 synchronization signal SW in the decoder 38, subjected to error correction and decoding processing, and out of 16 channels 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.

The controller 38 also 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. In addition, 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 selects the reception frequency block preset in the data RAM 43M, for example, using the up / down key 53. 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. Also, it selects an output channel from the 16 received channels based on the user's operation of the channel selection key 52, and controls the output of the decoder 38. In addition, the setting registration of the reception frequency block is performed by the up / down keys 53, 56.
The frequency is designated by using the memory key 59 and the like. For example, 20 reception frequency blocks can be registered in the data RAM 43M. The registered data content includes the power supply voltage value to the LNC 10 as well as the reception frequency.

When the program type is selected by the program type selection key 51, the controller 4
3 discriminates the broadcast channel corresponding to the program type from the service frame described above, and automatically selects the channel having the smallest channel number, for example. If there are multiple channels of the corresponding program type among the 16 channels currently being received, by pressing the same program type selection key 51,
Channels of the corresponding program type are selected in order from the smallest channel number.

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 controls the M 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 made 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. .

Further, a stereo / monaural channel mode display section 70, an M / S mode display section 71, a tuning-on display section 72 which 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.

FIG. 1 shows the control operation of the controller 43 when the program type tuning mode (hereinafter referred to as PTY mode) is set in the DSR receiver of the present embodiment having the above-described configuration.

The user selects, for example, the up / down key 53
When the controller 43 executes the reception control for the high frequency section 33 and the predetermined channel selection control for the decoder 34, the user selects the reception frequency by using the program type selection key 51. When the desired key is pressed, processing in PTY mode is started (F101
→ F102).

In the PTY mode, for example, when "news" is selected by the program type selection key 51,
This is a channel selection mode according to a designated program content type such that a channel currently being broadcast on news is automatically selected.
In this program type tuning mode, the controller 4
1 searches the service frame for a channel corresponding to the designated program type, and controls the decoder 38 so that a predetermined channel is selected from the corresponding one or a plurality of channels.

That is, by referring to the service frame obtained from the DSR broadcast signal currently received at a certain reception frequency (F102), it is determined whether or not there is a program content channel corresponding to the designated program type. Determine (F10
3) If present, all channels of the program type are presented by the channel presenting unit 69 in the display area 64 (F104). For example, channels 3ch, 5ch,
If 15ch is applicable, the numerical value of the channel presenting unit 69 corresponding to the 15ch is lit up and displayed.

Then, a predetermined channel, for example, the channel with the smallest channel number is designated from among them, and a channel selection control signal is supplied to the decoder 38 to select, for example, channel 3ch (F105). This tuning control is continued until the channel is no longer of the corresponding program type, for example, when the program on that channel ends (F
106).

That is, in the program type mode, it is checked whether the currently selected channel is the corresponding program type (F106). For example, when the program ends and the next program is a program of a different content type. If there was,
If the channel is no longer of the corresponding program type, the current PTY information is referenced again from the service frame (F102), and 1 in the current reception frequency block is set.
It is determined whether or not there is a program type channel among the 6 channels (F103). Then, if there is, the presentation (F104) in the channel presentation unit 69 of the corresponding program type and the channel number having the smallest channel number are similarly designated to select the decoder 38 (F105). That is, the channel of the corresponding program type is searched for within a certain reception frequency block and the channel switching control is automatically performed.

However, if all 16 channels received by the reception frequency block do not correspond to the designated program type at a certain time, or if the user designates the program type, the channel corresponding to the designated program type must be present. If the process is step
Continue from F103 to F107. Then, control is performed to switch the reception operation to the reception operation by another frequency block. For example, since the reception frequency block is preset in the data RAM 43M, the reception frequency block with the preset number next to the current reception frequency block is read out, and the high frequency unit 33 is controlled thereby to execute the reception operation. .

At this time, in order to inform the user that the reception frequency block has been automatically switched, the display in the block number display section 65 in the display area 64 (of course, the display number is changed) is displayed by blinking, or In addition to this, the dot display section displays a character for changing the reception frequency at 67 or a blinking display of the character.
(F108). Note that the DSR receiver 30 may be provided with an electronic sound generation unit or the like as the notification means, and the automatic switching operation of the reception frequency block may be notified by the electronic sound. If the notification effect is sufficient, only the switching display (not blinking) of the block number display section 65 may be performed.

Then, the PTY information is referred from the service frame for each channel received by the new reception frequency block (F102), and if there is a channel of the corresponding program type, the channel selection control for that channel is similarly performed. F104, F105, F106). If the corresponding program type channel does not exist in the new reception frequency block, the reception operation is executed by switching to another reception frequency block (F107, F108).

Although not shown in FIG. 1, in the present embodiment, when the user presses the same program type selection key 51 again during the PTY mode operation (that is, the user has another program of the same program type). To search for another channel of the same program type and switch to that channel.In this case as well, change the reception frequency block as well as the reception frequency block at that time to find the corresponding channel. To select a channel (that is, the same as the case of proceeding from step F106 to No).

Even if the reception operation is performed for all preset reception frequency blocks, if the channel of the program content corresponding to the designated program type is not found, the fact is displayed in the display area 64. It should be set to. For example, when "news" is designated, "NEWS-NOT FOUND" is displayed on the dot display section 67. Then, the channel selection operation is not performed as it is, and the operation waits, and the reception output is not executed. In this case, it is preferable to perform muting control so that noise output is not performed.

Of course, when the user operates the receiving frequency block or operates the channel selection key 52 in the PTY mode, the channel is selected regardless of the PTY mode.

By performing the processing shown in FIG. 1 in the PTY mode, the program of the content that the user wants to listen to is searched over the reception frequency and is automatically selected and output. Users do not need to perform complicated operations to search for programs
Operability in the Y mode and its usefulness are significantly improved. Further, when there is no channel of the corresponding program type in the frequency block being received, and if any channel of another frequency block has the program type, it is not left unsearched that it is not selected.
Of course, the automatic change of the reception frequency is notified by the display area 64, so that the user operation thereafter is not confused.

If the channel of the corresponding program type does not exist, the user can easily find that there is no desired program in the frequency block by not performing the display operation to that effect and not performing the tuning operation. Can be recognized.

The present invention is not limited to the DSR receiver, but can be widely applied as a receiver of a broadcasting system in which broadcasting signals are similarly multiplexed. Of course, the configuration and processing method of the DSR receiver when adopted as the DSR receiver are not limited to those in the above embodiment.

[0063]

As described above, the digital broadcast receiver of the present invention, when the user specifies the broadcast content type, the digital broadcast signal currently received is
When the digital broadcast signal channel corresponding to the broadcast content type designation does not exist or does not exist, it is configured to automatically switch the reception frequency, so the digital broadcast signal of the corresponding program type is searched for over each reception frequency. The channel selection control can be performed, and the operability in the mode operation in which the content type is designated is significantly simplified, and the usefulness of the program type channel selection processing is improved. Further, there is also an advantage that the user does not misunderstand the operation state recognition because unnecessary program output is not performed. Further, when the reception frequency switching process is automatically executed, the user is appropriately informed by notifying the user of the fact by the notifying means.

[Brief description of drawings]

FIG. 1 is a PTY in a DSR receiver according to an embodiment of the present invention.
It is a flow chart of processing in mode.

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 schematic explanatory diagram of a DSR system.

FIG. 6 is time division multiplexing and QP in a DSR system.
It is explanatory drawing of a SK processing part.

FIG. 7 is an explanatory diagram of time division multiplexing processing in the DSR system.

FIG. 8 is an explanatory diagram of a mainframe structure of a transmission signal of the DSR system.

FIG. 9 is an explanatory diagram of a service frame structure transmitted in the DSR system.

[Explanation of symbols] 30 DSR receiver 33 High frequency section 34 Satellite frequency converter 35 Cable frequency converter 36 Input switching circuit 37 QPSK demodulation section 38 Decoder 43 Controller 44 Operation section 45 Display section 51 Program type selection key 53 Up / Down key 64 Display Area 65 Block number display section 67 Dot display section 69 Channel display section

Claims (3)

[Claims] 1. A digital broadcast in which a plurality of digital broadcast signals are multiplexed within one reception frequency, and at least broadcast content type information as additional information corresponding to each digital broadcast signal is transmitted together with the digital broadcast signal. In a receiving digital broadcast receiver, a frequency designating unit that designates a receiving frequency, a content type designating unit that designates a broadcast content type, and a receiving operation that controls and is designated by the receiving frequency designated by the frequency designating unit. The digital broadcast signal having the broadcast content designated by the content type designating means is discriminated based on the broadcast content type information from a plurality of digital broadcast signals received at different reception frequencies and controlled to be selected. A control unit capable of performing a reception operation at a certain reception frequency. When the digital broadcast signal of the broadcast content designated by the content type designating means does not exist in the digital broadcast signal received at the reception frequency, the reception frequency is switched to another frequency and the reception operation control is executed. A digital broadcast receiver having the above-mentioned configuration. 2. A digital broadcast in which a plurality of digital broadcast signals are multiplexed within one reception frequency, and at least broadcast content type information is transmitted together with the digital broadcast signal as additional information corresponding to each digital broadcast signal. In a receiving digital broadcast receiver, a frequency designating unit that designates a receiving frequency, a content type designating unit that designates a broadcast content type, and a receiving operation that controls and is designated by the receiving frequency designated by the frequency designating unit. The digital broadcast signal having the broadcast content designated by the content type designating means is discriminated based on the broadcast content type information from a plurality of digital broadcast signals received at different reception frequencies and controlled to be selected. And a control unit capable of performing a reception operation at a certain reception frequency, If there is no digital broadcast signal of the broadcast content designated by the content type designating means in the digital broadcast signal received at the reception frequency, the reception frequency is switched to another frequency to execute the reception operation control. A digital broadcast receiver characterized in that 3. A notification unit is provided which can notify the change in the reception frequency when the control unit executes the reception operation control by changing the reception frequency without being designated by the frequency designating unit. The digital broadcast receiver according to claim 1 or 2, characterized in that