JP3084939B2 - Digital broadcast receiver - Google Patents

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 such as a sound by digital data.

[0002]

2. Description of the Related Art In recent years, digitization of transmission signals has progressed, and broadcasting using digital signals has been realized. As one of such systems, a digital satellite radio broadcasting (hereinafter, referred to as DSR) system has been developed. DSR
In the system, a plurality of broadcasting stations (for example, one for stereo broadcasting)
A broadcast signal based on digital data from 6 stations or 32 stations of monaural broadcast) is time-division multiplexed, subjected to QPSK modulation processing, and output to a broadcasting satellite at a frequency of, for example, 12 GHz.

Radio waves from a broadcasting satellite are received by a centralized receiving station (for example, a CATV station) or a satellite broadcasting antenna individually installed in each home or the like, and are transmitted via a broadcasting cable or directly from a satellite broadcasting antenna to a DSR receiver. , And received and demodulated by a DSR receiver to output radio broadcast audio.

As described above, broadcast signals from, for example, 16 broadcast stations are multiplexed in one reception frequency channel (hereinafter, referred to as a frequency block).
In the DSR receiver, not only the selection (tuning) of the frequency block but also the selection (tuning) of one digital broadcast signal from the received digital broadcast signals of the 16 stations can be performed. Is designed so that a desired broadcast can be heard by executing a tuning operation and a tuning operation.

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

[0006]

In such a DSR receiver, automatic channel selection control is performed using the program type information. For example, D
When the user designates a desired program content, for example, "news" by operating means provided in the SR receiver, the DSR receiver automatically finds a broadcast channel on which news is being broadcast from the 16 stations received, and searches for it. This is a process of selecting and outputting a channel.

[0007] By the way, the program content type changes on a 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 further determined whether or not a channel for broadcasting the program of the designated program type exists in the 16 stations being received, and if so, the channel is automatically switched to that channel. Such processing is performed.

[0008] However, when the channel of the program of the designated program type is no longer present, the channel cannot be changed as it is because appropriate channel selection processing based on the designated program type cannot be executed.
Also, in this case, if the channel selection process is performed appropriately irrespective of the program type, the user will be able to grasp the operation status because other types of programs are output even though the program type is specified. There is a problem that operation is confused or not.

Also, even if a channel that is broadcasting a program of the corresponding program type exists on a channel received at another reception frequency, the user cannot listen to it without noticing. Alternatively, there is a problem that the broadcast cannot be heard unless a complicated operation of searching for a channel by switching the reception frequency and then performing the program type designation operation again is performed.

[0010]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a method of multiplexing a plurality of digital broadcast signals within one frequency block and broadcasting at least as additional information corresponding to each digital broadcast signal. An object of the present invention is to improve the operability of a digital broadcast receiver that receives a digital broadcast in which content type information is transmitted together with a digital broadcast signal, in accordance with a program type designation.

That is, as a digital broadcast receiver, frequency designation means for designating a reception frequency (frequency block);
When the broadcast content type is specified according to the operation of a predetermined operator
The type designation unit and the frequency designation unit
Control the receiving operation at the specified receiving frequency, and
Among multiple digital broadcast signals received at the radio frequency
The broadcast content specified by the content type specifying means.
Digital broadcast signals (programs) of the type
It can be controlled based on the information to select and tune.
Control means for controlling the operation.

[0012] In particular, the control means is a receiving operation at a certain receiving frequency and the broadcast content type information includes
When selecting a certain digital broadcast signal based on
In the case where the predetermined operator is operated again, the channel is selected.
Digital broadcast signal that is different from the
And digital having the same broadcast content type information
The broadcast signal is received within the reception frequency being received or another reception frequency.
It is configured to execute control for selecting a channel within the wave number .

Further, the reception frequency is cut by the control means.
Replacement is performed for a preset reception frequency.
To be configured.

[0014] Further, the control means can notify the user of the change of the reception frequency when the reception operation is performed by changing the reception frequency without being specified by the user using the frequency specification means. Provide.

[0015]

[ Operation ] A user selects a certain broadcast content type by a predetermined operation element.
Specify another (program type), and it corresponds
When a digital broadcast signal is selected,
-Operation of the same broadcast content type by the above specified operation
Is performed when the user selects the same broadcast content type.
Judge that you want to tune to another digital broadcast signal
Preferably. Therefore, within the current reception frequency, or
Switches to another reception frequency and
To separately control the digital broadcasting signal corresponding to the
This is an appropriate control process for the user. Also this
In such a case, when the reception frequency switching process is not performed based on the operation of the frequency designation unit by the user,
By notifying the user to that effect by the notification means, the user can confirm the operation state.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a DSR system and a transmission data structure will be described first, 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. Reference numerals 1a to 1u denote 16 broadcasting stations for stereo broadcasting. In each of the broadcasting stations 1a to 1u, the broadcast audio is converted into digital data of 16-bit linear PCM quantized at a sampling frequency of 32 KHz, and then compressed to 14 bits by a quasi-instantaneous companding process and output. In addition, various types of information such as program type information, channel mode information, M / S mode information, and error correction codes are added as output data.

The 14-bit digital broadcast signal output from each of the broadcasting stations 1a to 1u is sent to the transmitting station 3 via the public line 2, for example. At transmitting station 3, 16
Time-division multiplexing processing unit 4 for digital broadcasting signals of channels
Performs a multiplexing process to generate an I signal in which eight channels are multiplexed and a Q signal in which eight channels are multiplexed. The I signal and the Q signal are supplied to a QPSK modulation processing section 5, and a QPSK modulated signal having a bandwidth of, for example, 15 MHz is output. The QPSK modulated signal is transmitted to the transmitting antenna unit 6
And transmitted to the satellite 7.

FIG. 6 shows the configuration of the time division multiplex processing section 4 and the QPSK modulation processing section 5. Reference numerals 4a and 4b denote switching multiplexing circuits. The switching multiplexing circuit 4a includes broadcast 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 The I signal is generated by multiplexing.

That is, as shown in FIG.
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 FIG.

On the other hand, the switching multiplexing circuit 4b includes the broadcasting station 1
Digital broadcast signals or channels ch9~ch16 from i~1u are supplied to the contact T ₉ through T ₁₆ respectively, Similarly, by connecting the contact point T ₉ through T ₁₆ are sequentially switched 1/256 KHz timing As shown in FIG. 7C, a Q signal is generated by multiplexing the digital broadcast signals of eight channels.

As shown in FIG. 6, the I signal is QPS
The signal is supplied to the I multiplier 5c via the low-pass filter 5a in the K modulation processing unit 5. The Q signal is supplied to a Q multiplier 5d via a low-pass filter 5b. Further I
The multiplier 5c is supplied with a carrier of a predetermined frequency output from the carrier generator 5e, and the Q multiplier 5d is shifted by 90 ° by a phase shifter 5f with the carrier of the predetermined frequency output from the carrier generator 5e. Has been supplied. Therefore, the output of the I multiplier 5c and the output of the Q multiplier 5d are
, A so-called QPSK (quadrature phase shift keying) modulated signal is obtained.

As shown in FIG. 5, a signal in the 12 GHz band transmitted via the satellite 7 is received by a joint receiving facility such as a CATV station 8 or a satellite broadcasting receiving antenna individually installed in each home or the like. 9.

The DSR signal received by the CATV station 8 is allocated to a predetermined channel frequency, transmitted along with a cable TV broadcast, an FM broadcast, and the like via a so-called broadcast cable 11, and supplied to, for example, a DSR receiver 30 in each home. The frequency band of the signal transmitted by the broadcast cable 11 is 50
860860 MHz, and one frequency block of the DSR signal uses the 118 MHz band among them. The DSR broadcast signal received by the satellite broadcast receiving antenna 9 is transmitted to a low noise converter (LNC) 10 at 950 to 1750 MHz.
, And input to the DSR receiver 30.

The transmission data structure of the DSR broadcast signal as an I signal and a Q signal will be described with reference to FIG. I signal,
Each of the Q signals multiplexes the broadcast signals of eight channels as described above, and as shown in FIGS. 8A and 8F, each of the main frames M _A and M _B of 320 bits (1/32 KHz) is used. Is formed.

The first 11 bits of the main frames M _A and M _B are allocated to the main frame synchronization signal SW, and the next 1 bit is used as a service bit SSB. Data blocks DB ₁ to DB ₄ of each 77 bits is provided subsequent to the service bit SSB in mainframe M _A. 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.

[0027] That is from the top to 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,
Top 11 among 14-bit L signals of channel ch2
Bits, similarly, the upper 11 bits of the R signal are assigned, followed by 19 check bits. These 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 ch1, and also the R signal The lower 3 bits of
Lower three bits of the 14-bit L signal of the second channel ch2, similarly to the lower 3 bits are allocated among the R signal, 77 data blocks DB ₁ bit is formed.

In the same manner, the data block DB ₂ has information on the third and fourth channels ch3 and ch4, the data block DB ₃ has information on the fifth and sixth channels ch5 and ch6, and the data block DB ₄ has 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, though not shown, each data block DB ₅ to D
In B _8, channel c containing check bits, etc.
Information of h9 to ch16 is allocated.

Here, only one service bit SSB is provided in one main frame (M _A , M _B ), but the service bits SSB supplied for each 1/32 KHz are collected in the DSR receiver 30. , A service frame as shown in FIG. In each broadcast of 16 channels received by this service frame, the above-mentioned program type information PTY, channel mode information CM for judging stereo / monaural / audio multiplexing, and M / S for judging music / speech (Speech). Mode information MS is determined.

_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 as shown in FIG. 9A.

The _first 16 bits of the service block are used as a sync word SY1, and service information PA is added to the following 48 bits. That is, as shown in FIG. 9B, the service information PA (Lch) for the L signal of the first channel ch1.
1), service information PA (Rch1) for the R signal,
Service information PA (Lch2) for the L signal of the second channel ch2, and service information PA for the R signal
(Rch2) are assigned by 8 bits each. 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 each of the channels ch15 and ch16 are formed.

The 8-bit service information PA is shown in FIG.
(C) 4-bit program type information PT
Y, M / S mode information MS of 1 bit, channel mode information CM of 2 bits, and 1 bit of parity. Sixteen broadcast content types are recorded by the 4-bit program type information PTY. For example, news, current events, information programs, sports, education, dramas,
Types include 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 to be music, and if it is "0", it is determined to be speech. Further, as the channel mode information CM, for example, "00" indicates a monaural broadcast. For example, when the first channel ch1 is a stereo broadcast, service information PA (Lch1) for an L signal and service information for an R signal Each channel mode information CM in PA (Rch1) is used, and if it is “01” or “01”, respectively, so-called audio multiplex broadcasting with independent monaural audio,
If it is "01" or "10", it is determined that the broadcast is an L or 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, reference numeral 31 denotes an antenna input terminal;
The signal is received by the satellite broadcast receiving antenna 9, and a DSR reception signal is input via the LNC 10. The LNC 10 includes an oscillator 10a, a local oscillator 10b, a mixer circuit 1
0c, which converts a signal in the 12 GHz band into a first intermediate frequency of 950 to 1750 MHz. On the other hand, a cable input terminal 32 receives a DSR reception signal of 50 to 860 MHz.

The 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, where the second intermediate frequency of 479.5 MHz and the third intermediate frequency of 40 MHz are used.
The signal is converted to an intermediate frequency and supplied to the S contact of the input switching circuit 36. The DSR reception signal from the cable input terminal 32 is input to the cable frequency converter 35,
The signal is converted to an intermediate frequency of z and supplied to the contact C 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 unit 37, where it is subjected to QPSK demodulation processing. It is demodulated and output as a signal and a Q signal.

The I and Q signals in the format of the main frames M _A and M _B are discriminated by the decoder 38 in accordance with the main frame synchronization signal SW, subjected to error correction and decoding processing, and are selected from among the time-division multiplexed 16 channels. A broadcast of a predetermined channel is selected and output. The tuned-out digital broadcast signal is digitally output from an output terminal 39 to another device, and is transmitted through a digital filter 40 and a D / A converter 41 to L and R.
As an analog audio signal, audio amplification /
The signal is supplied to an output circuit unit or another device, and is output as a broadcast sound through a speaker. Further, in the decoder 38, the service bits SSB extracted from the main frames M _A and M _B are supplied to the controller 43.

Reference numeral 43 denotes a controller for controlling various operations of the DSR receiver, which is constituted by a microcomputer. 43M is an internal data RAM for storing data used for control operations. The controller 43 sends control signals to the satellite frequency converter 34 and the cable frequency converter 3
5, a reception frequency (block selection) control signal and a switching control signal to the input switching circuit 36 are output.

The controller 38 sends a channel selection control signal to the decoder 38 to designate a channel to be selected. Further, a service frame is generated from the service bits 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 receiving 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;
Reference numeral 5 denotes a display unit. FIG. 3 shows a front panel of the DSR receiver provided with the operation unit 44 and the display unit 45. The operation unit 44 includes a power key 50, 16 program type selection keys 51, 16 channel selection keys 52 (1 to 16 numeric keys), an up / down key 53 for specifying a reception frequency block, and a direct frequency key. A frequency / clear key 54 for deleting input or registration settings, a monaural mode key 55 for selecting an output state for monaural broadcasting, an up / down key 56 for adjusting a receiving frequency, and an M / S mode for setting Music balance key 57, speech balance key 58, and memory key 5 for performing an operation of storing a reception frequency block
9 are provided. Further, a display mode key 60 for switching display and a direct frequency input operation key 6
1, an LNC power key 62 and the like are provided. Operation information from 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, for example, a reception frequency block preset in the data RAM 43M. Or, direct frequency input operation key 61 and numeric key (channel selection key) 5
2, and the reception frequency is designated using the frequency / clear key 54. Then, the controller 43 controls the high frequency unit 33 to perform a receiving operation at the designated frequency. Further, based on the operation of the channel selection key 52 by the user, the output channel is selected from the received 16 channels and the output of the decoder 38 is controlled. Up / down keys 53 and 56 are used to register and set the reception frequency block.
At the same time, the frequency is specified and the process is executed using the memory key 59. For example, 20 reception frequency blocks can be registered in the data RAM 43M. Note that the registered data content includes the power supply voltage value to the LNC 10 as well as the reception frequency.

When a program type is selected by the program type selection key 51, the controller 4
3 discriminates a broadcast channel corresponding to the program type from the above-described service frame, and automatically selects a channel having the smallest channel number, for example. When there are a plurality of 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 sequentially selected in ascending order of 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 sets the M / S for the selected channel.
The output volume control set based on the / S mode determination is performed.

The display section 45 is provided with a display area 64 of, for example, a liquid crystal panel, and various operating conditions are displayed under the control of the controller 43. Display area 6
4 is shown in FIG. That is, a block number display section 65 of a frequency block being received, a channel number display section 66 of a selected channel, numerical values and character information such as a reception frequency (for example, a broadcast station name or a name added to a registered frequency block) Etc.) dot display section 6
7, a signal level display section 68, a channel presenting section 69 for displaying a channel corresponding to the designated program type as described above, for example, corresponding to the 16 channels in the reception frequency block are provided. .

Also, a channel mode display section 70 such as stereo / monaural, an M / S mode display section 71, a tuning-on display section 72 which is lit when appropriate tuning is performed to indicate a reception state, and a shift in reception frequency. Are displayed. Frequency up / down instruction display sections 73a and 73b for displaying

FIG. 1 shows the control operation of the controller 43 when the channel selection mode (hereinafter, referred to as the PTY mode) according to the program type is set in the DSR receiver of the present embodiment thus configured.

When the user operates the up / down key 53, for example,
When the controller 43 executes the reception control on the high frequency section 33 and executes the predetermined channel selection control on the decoder 34, the user operates the program type selection key 51 When a desired key is pressed, processing in the 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 based on a specified program content type such that a channel in a news broadcast is automatically selected.
In this program type tuning mode, the controller 4
1 searches for a channel corresponding to the specified program type from the service frame, 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 channel of the program content corresponding to the designated program type. Determine (F10
3) If present, all channels of the program type are presented by the channel presentation 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 15ch is lit and displayed.

Then, a channel selection control signal is supplied to the decoder 38 by designating a predetermined channel from among them, for example, a channel having the smallest channel number, and channel 3 is selected (F105). This channel selection control is continued until the channel is no longer of the corresponding program type, for example, by ending the program of the channel (F
106).

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

However, if all of the 16 channels received by the reception frequency block at a certain time no longer correspond to the designated program type, or if the user designates the program type, there is no channel corresponding to the designated program type. If the process is a step
Proceed from F103 to F107. Then, control is performed to switch the receiving operation to a receiving operation using another frequency block. For example, since the reception frequency block is preset in the data RAM 43M, the reception frequency block to which the preset number next to the current reception frequency block is assigned is read, and the high frequency unit 33 is controlled to execute the reception operation. .

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

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

Although not shown in FIG. 1, in this embodiment, when the user presses the same program type selection key 51 again during the PTY mode operation (that is, when the user presses another program of the same program type) If you want to listen to), search for another channel of the same program type and switch to it. In this case as well, change the reception frequency block as well as within the reception frequency block at that time, and search for the corresponding channel. (Step F106 → No).

Even if the reception operation is performed for all the preset reception frequency blocks, if a channel of the program content corresponding to the designated program type is not found, the fact is displayed in the display area 64. It is good to For example, if “news” has been designated, “NEWS-NOT FOUND” is displayed on the dot display section 67. Then, it waits without executing the channel selection operation, and does not execute the reception output. In this case, it is preferable to perform muting control so that noise output is not performed.

If the user performs a reception frequency block designation operation or an operation using the channel selection key 52 during the PTY mode, the channel is selected regardless of the PTY mode.

In the PTY mode, by performing the processing as shown in FIG. 1, a program whose contents the user wants to listen to is searched over the receiving frequency and automatically selected and output. The user does not need to perform complicated operations to search for
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 there is no channel of the corresponding program type in any of the other frequency blocks, there is no search left that no channel is selected.
Of course, since the automatic change of the reception frequency is notified by the display area 64, the subsequent user operation is not confused.

Further, if there is no channel of the corresponding program type, not only the display to that effect but also the selection operation is not performed, so that the user can easily confirm that there is no desired program in the frequency block. Can be recognized.

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

[0063]

As described above, the digital broadcast receiver according to the present invention allows a user to operate a certain broadcast by using a predetermined operation element.
Specify the content type (program type), and it corresponds
When a digital broadcast signal to be
The user can obtain the same broadcast content type
If an operation is performed, the current
To the specified broadcast content type.
Tuning control of the corresponding digital broadcast signal
Therefore, users can use other digital broadcasts of the same content type.
Signal very easily will be able to tune to listen, the effect there Ru that operability is greatly simplified when mode operation is specified content type. Further also improved usability tuning process by program type. There is also an advantage that the user does not misunderstand the recognition of the operation state because unnecessary program output is not performed. In addition, when the reception frequency switching process is automatically executed, the user is notified of the fact by the notification means so that the user can accurately determine the operation state.

[Brief description of the drawings]

FIG. 1 shows a PTY in a DSR receiver according to an embodiment of the present invention.
It is a flowchart of the process in the mode.

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

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

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

FIG. 5 is a schematic explanatory diagram of a DSR system.

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

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

FIG. 8 is an explanatory diagram of a main frame 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 unit 34 Satellite frequency converter 35 Cable frequency converter 36 Input switching circuit 37 QPSK demodulation unit 38 Decoder 43 Controller 44 Operation unit 45 Display unit 51 Program type selection key 53 Up / Down key 64 Display area 65 Block number display Section 67 Dot display section 69 Channel presentation section

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 1/03-1/16 H04H 1/00 H04J 4/00

Claims (3)

(57) [Claims] 1. A digital broadcast in which a plurality of digital broadcast signals are multiplexed in 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 the receiving digital broadcast receiver, a frequency designation unit that designates a reception frequency, a content type designation unit that designates a broadcast content type according to an operation of a predetermined operation element, and a reception frequency designated by the frequency designation unit controls the reception operation, and from among the received at the specified receive frequency multiple digital broadcasting signal, a digital broadcast signal of the specified broadcast content type by the content type specifying means, based on the broadcast content type information Control means capable of performing control so as to determine and select a channel. Reception operation der due
And a digital based on the broadcast content type information.
While performing tuning of a broadcast signal, the predetermined operator
If is operated again, the selected digital broadcast will be transmitted.
Digital broadcast signal that is different from the
While receiving a digital broadcast signal having transmission content type information,
Tuning by selecting within the receiving frequency or other receiving frequency
A digital broadcast receiver characterized in that the digital broadcast receiver is configured to execute the control of: 2. The switching of a reception frequency by said control means.
Is performed on a preset reception frequency.
The digital broadcast receiver according to claim 1, wherein the digital broadcast receiver is configured as follows . 3. A notifying means capable of notifying a change in the reception frequency when the control means changes the reception frequency without performing the designation by the frequency designation means to execute the reception operation control. The digital broadcast receiver according to claim 1 or 2, wherein: