JP2000115003A - Digital broadcast receiving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a blank time resulting from broadcast service switching by channel selection as to the digital broadcast receiving device which receives digital broadcast service for a moving body. SOLUTION: This device is provided with a tuner 2 which inputs the receive signal from an antenna 1 and outputs a modulated signal, a demodulating circuit 3 which demodulates the modulated signal outputted from the tuner 2 and extracts plural coded signals, deinterleaving means 4 which restores interleaving processes of the plural encoded signals outputted from the demodulaing circuits, a selecting circuit 5 which selects at least one of the outputs of the respective deinterleaving means, an error correcting and decoding circuit 6 which performes a decoding process corresponding to the process on the transmission side for the signal outputted from the selecting circuit 5, a demultiplexing circuit 7, an information source decoding circuit 8, and an amplifying circuit 9 which amplifies and outputs the decoded signal. Accordingly, the blank time, resulting from the depth of interleaving when switched, may not be caused.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast receiving apparatus for receiving a digital broadcast service intended for a mobile object such as a portable receiving terminal or an in-vehicle receiving terminal, for example, which is generated when a broadcasting service is switched by channel selection or the like. The blank time can be reduced.

[0002]

2. Description of the Related Art FIG. 8 shows, as a means for reducing transmission errors, described in, for example, the Ministry of Posts and Telecommunications Broadcasting Administration Press Release "Preparation of Provisional System for 2.6 GHz Band Satellite Digital Audio Broadcasting" published on June 29, 1998. FIG. 3 is a block diagram showing a configuration example on the transmitting side of a digital broadcasting system including a widely common interleaving means. In the figure, reference numerals 40, 50 and 60 denote information source coding circuits, 41, 51 and 61 denote multiplexing circuits, and 42 and 5
2, 62, 47 are error correction coding circuits, 43, 53, 6
Reference numerals 3 and 48 denote interleaving circuits, 44 denotes a modulator, 45 denotes a frequency conversion amplifier circuit, and 46 denotes a transmission antenna. In the broadcast channel, the original audio / image is encoded by the information source encoding circuits 40, 50, 60 for each channel, and multiplexed by the multiplexing circuits 41, 51, 61, and the error correction encoding circuit 42, Error correction coding is performed at 52 and 62, and interleaving is performed at interleaving circuits 43, 53 and 63. In a pilot channel independent of a broadcast channel, which is used for analysis of a received signal on a receiver side, detection of synchronization of a spread code, and transmission of control information, the control signal is corrected by an error correction coding circuit 47. The data is interleaved by a coding / interleaving circuit 48. Each signal interleaved through the above operation is modulated by the modulator 44, synthesized, frequency converted and amplified by the frequency conversion amplifier circuit 45, and then emitted from the transmission antenna 46 as a broadcast signal.

FIG. 9 is a block diagram showing the configuration of a receiving apparatus for the transmitting side in FIG. In the figure, 1 is a receiving antenna, 2 is a tuner, 30 is a demodulation circuit, 4 is a deinterleave circuit, 6 is an error correction decoding circuit, 7 is a demultiplexing circuit, 8 is an information source decoding circuit, 9 is an amplification circuit, 10 is an amplification circuit, It is an output unit, and a decoding system for decoding a broadcast channel related to transmission of source data of an information source is constituted by 4 to 10. Meanwhile, 1
1 is a deinterleave circuit, 12 is an error correction decoding circuit, 1
4 is a tuning operation switch, 70 is a control circuit, and 11 to 11
14, 70 constitute an operation system of the decoding of the pilot channel related to the data transmission and the operation of the receiving device for facilitating the control and the reception of the receiving device.

[0004] A received signal received by the receiving antenna 1 is input to a tuner 2 and modulated to output a modulated signal. The modulated signal output from the tuner 2 is input to the demodulation circuit 30, where the pilot channel and the selected broadcast channel are demodulated. The broadcast channel output from the demodulation circuit 30 is input to the deinterleave circuit 4 and is restored from the interleave processing. The output of the deinterleave circuit 4 is input to an error correction decoding circuit 6 and subjected to error correction decoding processing. The output of the error correction decoding circuit 6 is input to the demultiplexing circuit 7, where the multiplexed signal is separated. Demultiplexing circuit 7
Is input to the information source decoding circuit 8 and decoded to become a signal similar to that of the information source on the transmission side. The output of the information source decoding circuit 8 is amplified by the amplifier circuit 9 and output from the output unit 10.

[0005] The pilot channel output from the demodulation circuit 30 is input to the deinterleave circuit 11 and restored from the interleave processing. The output of the deinterleave circuit 11 is input to an error correction decoding circuit 12 and subjected to an error correction decoding process. The output of the error correction decoding circuit 12 and the output of the tuning operation switch 14 are input to the control circuit 70, and perform various controls of the receiving device such as tuning. The control circuit 70 selects a broadcast channel in the demodulation circuit 30 based on the result of the channel selection by the channel selection operation switch 14.

[0006] In a mobile reception environment, the received radio wave may be interrupted frequently in some cases, so that a burst-like error occurs in the received signal. Therefore, by performing interleaving for rearranging data on the transmitting side and transmitting the data, and then deinterleaving on the receiving side, errors are dispersed and reduced. FIG. 10 is an explanatory diagram illustrating this series of operations. When the data sequence of (a) is rearranged as shown in (b), even if an error occurs as shown in (c), the error is dispersed if the rearrangement is restored. Further, it can be expected that the error is corrected by error correction decoding. The longer the reordering period, ie, the depth of the interleave, the more errors can be tolerated. For this reason, the interleave depth is set for a period longer than the expected instantaneous interruption time. This period is generally set as long as several seconds, since it is related to how long the broadcasting system can endure deterioration of reception conditions.

On the transmitting side, when a plurality of information sources are encoded by, for example, MPEG2, and packets corresponding to the respective information sources are multiplexed in the form of a transport stream, the packets are multiplexed by the demultiplexing circuit 7. The information source decoding circuit 8 performs MPEG2 decoding.

[0008]

Since the conventional digital broadcast receiving apparatus is configured as described above, a case where a broadcast service is switched and received depending on the time for preventing a problem due to an instantaneous interruption and the depth of interleaving. In addition, there is a problem that a waiting time longer than an interleave period is required. That is, there is a problem that a blank time occurs due to the interleave depth when switching the broadcasting service by tuning or the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. By configuring a receiving apparatus to perform processing up to deinterleaving on at least some broadcast channels in advance, the present invention provides a It is an object of the present invention to obtain a digital broadcast receiving apparatus capable of reducing the generated blank time.

[0010]

SUMMARY OF THE INVENTION A digital broadcast receiving apparatus of the present invention individually performs information source coding, multiplexing, error correction coding, and interleaving processes on a plurality of systems of broadcast services. A digital broadcast receiving apparatus for transmitting a modulated signal obtained by modulating and synthesizing each of them, the first configuration of which is a tuner that inputs a signal received by an antenna and outputs a modulated signal, and a tuner that outputs the modulated signal. Demodulation means for demodulating a modulated signal to extract a plurality of encoded signals, a plurality of deinterleave means for restoring an interleave process of each of the plurality of encoded signals output from the demodulation means, and a plurality of deinterleave means. Selecting means for selecting at least one system from the output, and error correction for performing decoding processing corresponding to processing on the transmission side on a signal output from the selecting means No., those with demultiplexing means, and the means of the information source decoding, and amplification output means for amplifying the decoded signal output.

In a second configuration of the digital broadcast receiving apparatus according to the present invention, in the first configuration, the digital broadcast receiving apparatus further includes preset tuning means for presetting information for channel selection, and the demodulation means sets the plurality of preset plural sets. The modulation signal of the broadcast service is demodulated, and the encoded signal is input to the deinterleaving means.

[0012] A third configuration of the digital broadcast receiving apparatus according to the present invention is the digital broadcast receiving apparatus according to the first configuration, further comprising deinterleaving means for a shared channel included in the plurality of systems of broadcast services. In this configuration, a plurality of coded signals including the signals are extracted, and the coded signals of the shared channel are always output to the deinterleave circuit.

A fourth aspect of the digital broadcast receiving apparatus according to the present invention is the digital broadcast receiving apparatus according to any one of the first to third aspects, wherein the plurality of deinterleaving means encode a plurality of broadcast channels output from the demodulating means. The channel search is performed by sequentially switching and inputting signals.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention separately performs information source coding, multiplexing, error correction coding, and interleaving processes for a plurality of systems of broadcast services (audio and video) on the transmitter side. This is a device that receives a digital broadcast to transmit and transmit a modulated signal that has been subjected to modulation, modulated, and combined. In the first configuration of the present device, the output of a tuner that inputs a received signal received by an antenna and outputs a modulated signal is demodulated by a demodulation unit to extract a plurality of encoded signals, and a plurality of deinterleaving units are provided. , The de-interleaving process is individually performed on each of the plurality of encoded signals, and the resulting signals are input to the selecting unit. The deinterleaved signal selected by the selection means is restored to the original audio / video signal by error correction decoding, demultiplexing, and information source decoding, and output through the amplification means. Unlike the conventional apparatus, among the plurality of received broadcast channels, at least some of the broadcast channels are preliminarily processed until deinterleaving, and the following processing is performed by selecting them based on channel selection in the receiving apparatus. In addition, there is an effect that the blank time at the time of channel selection caused by the depth of interleaving as a measure against instantaneous interruption can be greatly reduced.

Further, in the second configuration, the output of the tuner that receives the received signal received by the antenna and outputs the modulated signal is demodulated by the demodulation means, and a plurality of encodings preset by the preset tuning means are performed. The signals are extracted, individually deinterleaved, and input to the selection means. The deinterleaved signal selected by the selection means is restored to the original audio / video signal by error correction decoding, demultiplexing, and information source decoding, and output through the amplification means. In addition to the above effects, channels that are frequently used can be preset, so that the number of required systems for deinterleaving can be reduced in advance.

In the third configuration, the output of a tuner that inputs a received signal received by an antenna and outputs a modulated signal is demodulated by a demodulation means to extract a plurality of encoded signals including a shared channel at all times. Are individually deinterleaved and input to the selection means. The deinterleaved signal selected by the selection means is restored to the original audio / video signal by error correction decoding, demultiplexing, and information source decoding, and output through the amplification means. In addition to the above-described effect of shortening the blank time, a blank period does not occur when switching between the broadcast channel and the shared channel.

Further, in the fourth configuration, a plurality of coded signals are extracted by demodulating the output of a tuner that inputs a received signal received by an antenna and outputs a modulated signal by demodulation means. Broadcast channels to be demodulated are sequentially switched by pilot channel control means. The extracted coded signals are individually deinterleaved and input to the selection means. The signal after deinterleaving selected by the selection means by the channel search operation is restored to the original audio / video signal by error correction decoding, demultiplexing, and information source decoding, and output via the amplification means. The blank time when performing a channel search can be greatly reduced.

Embodiment 1 FIG. 1 is a block diagram showing a mobile digital broadcast receiving apparatus according to Embodiment 1 of the present invention. In the figure, 1 is a receiving antenna, 2 is a tuner, 3 is a demodulation circuit, 4 is a deinterleave circuit, 5 is a selection circuit, 6 is an error correction decoding circuit, 7 is a demultiplexing circuit, 8 is an information source decoding circuit, 9 is The amplifier circuit 10 is an output unit,
A broadcast channel system is constituted by 4 to 10. There are a plurality of outputs of the broadcast channel system of the demodulation circuit 3 and a plurality of deinterleave circuits 4, respectively. Reference numeral 11 denotes a deinterleave circuit, reference numeral 12 denotes an error correction decoding circuit, reference numeral 13 denotes a control circuit, and reference numeral 14 denotes a channel selection operation switch.

In the first embodiment, a broadcast signal received by a receiving antenna 1 is input to a tuner 2 and a modulated signal is output. The modulation signal output from the tuner 2 is input to the demodulation circuit 3 and a predetermined number (plural).
Are demodulated. Demodulation circuit 3
Are output to the deinterleave circuit 4 and restored from the interleave processing. The output of each deinterleave circuit 4 is input to the selection circuit 5. On the other hand, the demodulation circuit 3 also demodulates the pilot channel and outputs the demodulated signal.
And restored from the interleaving process. The output of the deinterleave circuit 11 is input to an error correction decoding circuit 12 and subjected to an error correction decoding process. Error correction decoding circuit 1
2 is input to the control circuit 13 and the demodulation circuit 3 and the selection circuit 5 are selected based on channel selection by the channel selection operation switch 14.
Generate a signal that controls The demodulation circuit 3 controls the control circuit 1 except when demodulating all broadcast channels.
3 demodulates the broadcast channel based on the control signal. The selection circuit 5 performs selection from output signals of the plurality of deinterleaving circuits 4 based on a control signal from the control circuit 13. The signal output from the selection circuit 5 is input to the error correction decoding circuit 6 and subjected to error correction decoding processing. The output of the error correction decoding circuit 6 is input to the demultiplexing circuit 7, where the multiplexed signal is separated. The output of the demultiplexing circuit 7 is input to an information source decoding circuit 8 and is decoded to have the same signal as the information source on the transmission side.
The original audio / video signal is restored. The output of the information source decoding circuit 8 is amplified by the amplifier circuit 9 and output from the output unit 10.

As in the conventional example, for example, MPEG
When each of the plurality of information sources is encoded in 2 and packets corresponding to each information source are multiplexed in the form of a transport stream, the demultiplexing circuit 7 separates the multiplexed packets, and In step 8, MPEG2 decoding is performed.

FIG. 2 shows a demodulation circuit 3 according to the first embodiment.
FIG. 2 is a block diagram showing an example of the configuration of the first embodiment, which uses a code division multiplexing system. In the figure, 101, 103, 11
3, 123 are multipliers, 102 is a first despreading code generator 1, 104 is a 2a despreading code generator, and 114 is a second despreading code generator.
b is the despreading code generator, 124 is the 2c despreading code generator, and 105, 115, 125, and 106 are QPSK (4
Phase modulation) demodulation circuit. As shown in the figure, a plurality of combinations are prepared as a broadcast channel system, and a plurality of demodulated outputs are output.

FIG. 3 is a block diagram showing the structure of the modulation section 44 on the transmission side according to the code division multiplexing method.
FIG. 4 is a diagram for explaining the modulation and demodulation operations. In FIG. 3, 200, 210, 220, and 203 are QPSK modulation circuits, 201, 211, 221, 204, and 206 are multipliers, 202 is a 2a-th spreading code generator, and 212 is a second
Reference numeral b denotes a spread code generator, 222 denotes a 2c spread code generator, 207 denotes a first spread code generator, and 205 denotes an addition circuit. As shown in FIG. 8, in the broadcast channel system, there are a plurality of similar circuit configurations. After the information source signals are coded, multiplexed, error-correction coded, and interleaved for each of them, the circuit configuration shown in FIG. The signal is supplied to the modulator 44. In the pilot channel, various control signals are supplied to the modulation section 44 after being subjected to error correction coding and interleaving.

The broadcast channel 1 will be described as an example. By modulating the input in FIG. 3 by the QPSK modulation circuit 200, a narrow-band spectrum as shown in FIG. 4A is obtained. The spectrum is spread as shown in (b) by multiplication with the spreading code twice. This 2a-th spreading code generator 20
The second side is used for channel identification, and the first spreading code generator 20
The side 7 is for multipath synthesis. The modulation section 4 in FIG.
The output from 4 is a composite of the spread spectrum as shown in FIG. In the demodulation circuit 3 of FIG. 2, in the case of the broadcast channel 1, only the channel 1 is despread by multiplication of the output of the despread code generator 1 and the output of the despread code generator 2a as shown in FIG.

As described above, in the receiving apparatus according to the first embodiment, processing up to deinterleaving is performed in advance for a plurality of broadcast channels, and signals after the deinterleaving are determined based on channel selection in the receiving apparatus. Since selection and subsequent processing are performed to restore the original signal, the blank time at the time of channel selection due to the interleave depth as a measure against instantaneous interruption can be greatly reduced.

Embodiment 2 FIG. 5 is a block diagram showing a mobile digital broadcast receiving apparatus according to the second embodiment of the present invention, which is obtained by adding a preset tuning circuit 15 to the configuration of the first embodiment shown in FIG. Mobile receiving devices such as car radios generally have a preset function in order to facilitate channel selection, that is, switching of broadcast services,
Also, the user can arbitrarily set it. Therefore, the preset tuning circuit 15 demodulates a plurality of broadcast services preset in advance, and deinterleaves a plurality of coded signals taken out. The subsequent operation is the same as in the first embodiment. Since processing up to deinterleaving is performed for a plurality of broadcast channels based on the preset tuning circuit 15 in advance, and these are selected based on channel selection and subsequent processing is performed, the same as in the first embodiment, a blank at the time of channel selection is performed. This has the effect of greatly reducing the time. Further, since channels that are frequently used can be preset, the number of required systems for deinterleaving can be set to be small in advance. The deinterleave circuit 4 can be reduced.

Embodiment 3 FIG. FIG. 6 is a block diagram showing a mobile digital broadcast receiving apparatus according to the third embodiment of the present invention. In the configuration of the first embodiment shown in FIG. 1, a deinterleave circuit 16 dedicated to a shared channel included in a broadcast channel system is added. Has been added. The shared channel is always demodulated separately from the other broadcast channels, restored from the interleave processing by the deinterleave circuit 16, and input to the selection circuit 5. The shared channel is a channel for exclusively transmitting information that can be shared from each broadcast channel, and is used by switching from each broadcast channel as needed. Switching between each broadcast channel and the shared channel is performed by the selection circuit 5. At this time, the switching control
A method of transmitting information of switching between the broadcast channel being received and the shared channel, for example, through a pilot channel is used. Since processing up to deinterleaving is performed in advance for a plurality of broadcast channels and shared channels, and they are selected based on channel selection in the receiving apparatus, and subsequent processing is performed. This has the effect of greatly reducing the time. Furthermore, there is no blank period when switching between the broadcast channel and the shared channel.

Embodiment 4 FIG. 7 is an operation explanatory diagram showing an example of a channel search technique relating to the mobile digital broadcast receiving apparatus according to the fourth embodiment of the present invention. The device configuration is the same as in the first to third embodiments shown in FIGS. 1, 5 and 6, and the operation of the control circuit 13 is characteristic. FIG. 7 shows a case where the number of broadcast channels is 6, and the number of parallel deinterleaving circuits is 3, for example. First, the demodulation circuit 3 demodulates Ch1 and encodes the coded signal into a deinterleave circuit a, demodulates Ch2 and encodes the encoded signal into a deinterleave circuit b, and demodulates Ch3 and decodes the encoded signal. It switches and outputs to the interleave circuit c in order,
The output of the deinterleaving circuits a, b, and c is sequentially switched in the selection circuit 5 by the channel search operation. The demodulation circuit 3 sequentially demodulates the next channel from the part where the search has been selected, such as Ch4 after Ch1, Ch5 after Ch2, Ch6 after Ch3, and outputs the demodulated data to the corresponding deinterleave circuit. Further, the demodulation circuit 3 will be described with reference to the example of the code division multiplexing system of FIG. 2, and the 2a, 2b, and 2c despreading code generators 10
This is realized by sequentially switching the despreading codes in 4, 114 and 124. Performs processing up to deinterleaving for a plurality of broadcast channels in advance, selects them based on channel selection in the receiving device, and performs subsequent processing, and operates a demodulation circuit and a selection circuit in cooperation with each other as a channel search operation. By doing so, there is an effect that a channel search can be performed while greatly shortening the blank time due to the interleave depth as a measure against instantaneous interruption.

[0028]

Since the present invention is configured as described above, it has the following effects.

The first configuration of the digital broadcast receiving apparatus according to the present invention is that, after individually performing information source coding, multiplexing, error correction coding, and interleaving processes on a plurality of broadcasting services, In a digital broadcast receiving apparatus that transmits a modulated signal synthesized by modulating a signal, a tuner that inputs a signal received by an antenna and outputs a modulated signal, and a demodulator that demodulates the modulated signal output from the tuner and generates a plurality of codes. Demodulating means for extracting an encoded signal, a plurality of deinterleaving means for restoring the interleaving process of each of the plurality of encoded signals output from the demodulating means, and a selecting means for selecting at least one system from the output of each deinterleaving means Error correction decoding, demultiplexing means for performing decoding processing corresponding to processing on the transmission side on the signal output from the selection means, By providing each means for source decoding and amplification output means for amplifying and outputting the decoded signal, a process up to deinterleaving is performed for a plurality of broadcast channels in advance, and these are selected in a receiving device. , And the subsequent processing is performed, so that there is an effect that the blank time at the time of channel selection due to the interleave depth as a measure against instantaneous interruption can be greatly reduced.

A second configuration of the digital broadcast receiving apparatus according to the present invention, in the first configuration, further comprises preset tuning means for setting information for channel selection in advance, and the demodulation means sets a plurality of the preset plural sets. Since the modulation signal of the broadcast service is demodulated and the encoded signal is input to the deinterleaving means, the blank time at the time of tuning can be significantly reduced, and the frequently used channel can be preset. The required number of systems for deinterleaving can be reduced in advance.

A third configuration of the digital broadcast receiving apparatus according to the present invention is the digital broadcast receiving apparatus according to the first configuration, further comprising deinterleaving means for a shared channel included in the plurality of systems of broadcast services, The coded signal of the shared channel is extracted and the coded signal of the shared channel is always output to the deinterleave circuit, so that the blank time at the time of channel selection can be greatly reduced and shared with the broadcast channel. There is no blank period when switching channels.

In a fourth aspect of the digital broadcast receiving apparatus according to the present invention, in any one of the first to third aspects, encoding of a plurality of broadcast channels output from the demodulating means to the plurality of deinterleaving means is provided. Since the channel search is performed by sequentially switching and inputting signals, there is an effect that the blank time due to the interleave depth can be significantly reduced even in the channel search.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a demodulation circuit of the digital broadcast receiving device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing an example of a digital broadcast transmitting side modulator according to Embodiment 1 of the present invention.

FIG. 4 is an explanatory diagram illustrating an example of an operation of modulation and demodulation according to Embodiment 1 of the present invention.

FIG. 5 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to a third embodiment of the present invention.

FIG. 7 is an explanatory diagram of a channel search operation of the digital broadcast receiving apparatus according to Embodiment 4 of the present invention.

FIG. 8 is a block diagram showing a configuration of a transmitting side of a general digital broadcasting system according to the present invention.

FIG. 9 is a block diagram showing a configuration of a conventional digital broadcast receiving apparatus.

FIG. 10 is an explanatory diagram illustrating an operation of interleaving and deinterleaving according to the present invention.

[Explanation of symbols]

1 receiving antenna, 2 tuner, 3 demodulation circuit, 4
Deinterleave circuit, 5 selection circuit, 6 error correction decoding circuit, 7 demultiplexing circuit, 8 information source decoding circuit, 9 amplification circuit, 10 output section, 11 deinterleave circuit, 1
2 Error correction decoding circuit, 13 control circuit, 14 tuning operation switch.

 ──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Masayuki Ishida 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5J065 AA03 AB01 AC02 AE02 AG06 AH09 5K014 AA02 FA16 HA06 5K061 AA04 AA13 BB06 CC00 CC45

Claims (4)

[Claims] A digital signal for transmitting a modulated signal obtained by individually performing information source coding, multiplexing, error correction coding, and interleaving processes on a plurality of systems of broadcast services, and then modulating and combining the processed signals. A broadcast receiving apparatus, comprising: a tuner that receives a signal received by an antenna and outputs a modulated signal; a demodulator that demodulates the modulated signal output from the tuner to extract a plurality of encoded signals; A plurality of deinterleaving means for restoring the interleaving process of each of the plurality of encoded signals output from the means, a selecting means for selecting at least one system from the outputs of the deinterleaving means, and a signal output from the selecting means Error correction decoding, demultiplexing means, information source decoding means that performs decoding processing corresponding to the processing on the transmission side, and amplifies and outputs the decoded signal. A digital broadcast receiving device comprising: 2. Preset tuning means for presetting information for channel selection, wherein the demodulation means demodulates the modulated signals of the plurality of preset broadcast services and de-interleaves the coded signals thereof. 2. The digital broadcast receiving device according to claim 1, wherein the digital broadcast receiving device is configured to input the digital broadcast to a means. 3. A shared channel deinterleaving unit included in the plurality of systems of broadcasting services, wherein the demodulation unit extracts a plurality of coded signals including the shared channel and encodes the shared channel. 2. The digital broadcast receiving apparatus according to claim 1, wherein a signal is always output to said deinterleave circuit. 4. A channel search is performed by sequentially switching and inputting encoded signals for a plurality of broadcast channels output from said demodulation means to said plurality of deinterleaving means. Item 4. The digital broadcast receiving device according to any one of Items 1 to 3.