JP2001285737A - Channel setting method and digital broadcasting reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set information for instructing a channel to a digital broadcasting adapter from a digital broadcasting receiver in a digital broadcasting reception system provided with the digital broadcasting adapter and the broadcasting receiver connected through a connection means. SOLUTION: Frequency information for specifying a frequency is sent from the digital broadcasting receiver to the digital broadcasting adapter and the digital broadcasting adapter which receives the frequency information performs tuning to the specified frequency, sets a parameter for performing demodulation and detects the presence/absence of reception signals. When the reception signals are present, the parameter other than the frequency required for reception is paired with the specified frequency and stored in a storage means inside the digital broadcasting adapter. Also, the digital broadcasting receiver pairs information for indicating a reception state at the time and the identification information of a transport stream included in the reception signals with the specified frequency and stores them in the storage means inside the digital broadcasting receiver.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a digital broadcast receiving system for receiving digital broadcasts, and a channel setting method in the digital broadcast receiving system.

[0002]

2. Description of the Related Art BS digital broadcasting is started in December 2000. Along with that, a BS digital broadcast receiver will be released. On the other hand, digitalization of terrestrial broadcasting is also progressing, and it is planned that terrestrial digital broadcasting will be started in large cities in 2003. Under such circumstances, in order to be able to receive terrestrial digital broadcasts starting in 2003 with the BS digital broadcast receiver released in 2000, a terrestrial wave reception adapter (terrestrial digital broadcast adapter) was received. External attachment to the machine is being considered.

[0003] The feature of terrestrial digital broadcasting is that it has regional characteristics. For example, when receiving terrestrial broadcasting in the Osaka area, there is a characteristic that it is possible to receive across the region, such as broadcasting in the Kobe or Kyoto area, so preset channel information nationwide in advance. I can't keep it. For this reason,
In order to receive terrestrial digital broadcasting, it is necessary to perform a channel search when a terrestrial digital broadcasting receiver is purchased, and select all receivable channels (channel preset). However, in the case of a two-body configuration consisting of a BS digital broadcast receiver and a terrestrial digital broadcast adapter, reception is possible unless a method of performing channel preset between them and a method of setting a channel from the BS digital broadcast receiver to the terrestrial digital broadcast adapter are determined. That is, it is not possible to select a suitable channel, and further it is not possible to select a channel.

[0004]

The BS digital broadcast receiver and the terrestrial digital broadcast adapter are connected by a digital interface called IEEE1394. This interface can simultaneously transmit data and control signals, so-called commands. When selecting a channel of a terrestrial digital broadcast adapter from a BS digital broadcast receiver, use the tuner command already standardized by the 1394 Trade Association to set the frequency from the BS digital broadcast receiver to the terrestrial digital broadcast adapter. Can be tuned. However, other parameters required for performing a channel selection operation with the terrestrial digital broadcast adapter, for example, a command for transmitting information on a mode or a guard interval from the BS digital broadcast receiver to the terrestrial digital broadcast adapter are not standardized. Therefore, when setting a frequency from the BS digital broadcast receiver to the terrestrial digital broadcast adapter by simply setting the frequency to the terrestrial digital broadcast adapter using a tuner command, all the setting information cannot be sent. Mode and guard interval must be set. Whether or not the terrestrial digital broadcast adapter has been selected can be confirmed by the status information of the terrestrial digital broadcast adapter being acquired by the BS digital broadcast receiver. Search flag (Searching) as status information,
There are an antenna signal presence / absence flag (no_RF) (or available flag), signal strength (Strength), bit error rate (BER), and the like. By combining them, it is possible to share information on whether or not the terrestrial digital broadcast adapter has been able to select a channel by setting from the BS digital broadcast receiver.

[0005] Unless the BS digital broadcast receiver knows in advance which channels can be received by the terrestrial digital broadcast adapter, it is necessary to search all the channels every time a channel is set, and it takes a long time to select a channel. Not practical. Therefore, the BS digital broadcast receiver must cause the terrestrial digital broadcast adapter to perform channel presetting and know in advance the channels that the terrestrial digital broadcast adapter can receive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. A digital broadcast adapter for receiving a digital broadcast signal, and the digital broadcast adapter and I
A digital broadcast receiver connected to the digital broadcast adapter via an IEEE 1394 interface and reproducing the digital broadcast signal received by the digital broadcast adapter, receiving the digital broadcast signal from the digital broadcast receiver to the digital broadcast adapter An object of the present invention is to provide a channel setting method capable of setting information for designating a channel of a digital broadcast signal, and a digital broadcast receiving system capable of performing channel setting using the channel setting method.

[0007]

According to one aspect of the present invention, a digital broadcast adapter for receiving a digital broadcast signal is connected to the digital broadcast adapter via connection means. Indicating a channel of a digital broadcast signal to be received from the digital broadcast receiver to the digital broadcast adapter in a digital broadcast receiving system including a digital broadcast receiver for reproducing the digital broadcast signal received by the digital broadcast adapter. In a channel setting method for setting information for performing, a designated frequency transmitting step of transmitting frequency information designating a frequency from the digital broadcast receiver to the digital broadcast adapter via the connection means, and receiving the frequency information. The digital broadcast adapter tunes to a specified frequency. And a receiving signal detecting step of detecting the presence or absence of a receiving signal by setting a parameter for demodulation, and when there is a receiving signal in the receiving signal detecting step, the parameter other than a frequency necessary for receiving the parameter. The digital broadcast receiver stores the information indicating the reception state at that time and the identification information of the transport stream included in the received signal in the storage means in the digital broadcast adapter in combination with the designated frequency. An information storage step of storing in a storage means in the digital broadcast receiver a pair with a designated frequency.

Further, according to the present invention (claim 2), in the channel setting method according to claim 1, in the information storing step, information indicating a reception state and identification information of a transport stream included in a received signal are stored. When storing in the storage means in the digital broadcast receiver as a pair with the designated frequency, the same identification information as the identification information of the transport stream to be stored is already paired with a different frequency in the digital broadcast receiver. When the reception condition at the designated frequency to be newly stored is better than the reception condition at the different frequency already stored, the different frequency already stored is stored in the storage means. Is rewritten to the designated frequency that is to be newly stored and the already stored The information indicating the reception state at a different frequency is rewritten with the information indicating the reception state at the designated frequency to be newly stored, so that the information indicating the reception state and the identification information of the transport stream included in the reception signal are specified. And stored in a storage means in the digital broadcast receiver in combination with the set frequency.

The present invention (claim 3) provides a digital broadcast adapter for receiving a digital broadcast signal, a digital broadcast adapter connected to the digital broadcast adapter via connection means, and a digital broadcast signal received by the digital broadcast adapter. And a digital broadcast receiver comprising a digital broadcast receiver for reproduction, wherein the digital broadcast receiver transmits information for indicating a channel of a digital broadcast signal to be received from the digital broadcast receiver to the digital broadcast adapter. When setting a channel to be set, frequency information specifying a frequency is sent to the digital broadcast adapter via the connection means. When the digital broadcast adapter receives the frequency information, it tunes to the specified frequency. And set the parameters for demodulation. Detecting the presence or absence of a communication signal, and when there is a reception signal, while storing the parameters other than the frequency required for reception with the specified frequency in a storage means in the digital broadcast adapter, Information indicating a reception state, and a transport stream included in the reception signal are output to the digital broadcast receiver via the connection means, and the digital broadcast receiver outputs the information indicating the reception state; And when a transport stream included in the received signal is received, information indicating a reception state and identification information of the transport stream included in the received signal are paired with the designated frequency and stored in the digital broadcast receiver. It is stored in the means.

According to the present invention (claim 4), in the digital broadcast receiving system according to claim 3, the digital broadcast receiver is connected to the digital broadcast adapter which has not been connected to the digital broadcast receiver. When the connection is made, the connection is detected and a message to the effect that the channel setting should be performed is displayed on the display means, or the channel setting operation is automatically performed.

According to the present invention (claim 5), in the channel setting method according to claim 1 or 2, the connection means is an IEEE1394 interface.

According to the present invention (claim 6), in the digital broadcast receiving system according to claim 3 or 4, the connection means is an IEEE1394 interface.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing a configuration of the digital broadcast receiving system according to the present embodiment. In the figure, 100 is a BS digital broadcast receiver, and 200 is a terrestrial digital broadcast adapter. B
The S digital broadcast receiver 100 demodulates and decodes the IF signal received from the BS antenna 107 by the demodulation and decoding circuit 101 and inputs the transport stream to the transport decoder 102. TC for BS digital broadcasting
The tuner and the demodulation / decoding circuit thereof are 101 using the 8PSK modulation method. Then, the transport decoder (TD) 102 decodes the input transport stream and selects a service. For the selected service, MPEG decoding of video and audio is performed by the AV decoder 103, the video of the decoded signal is displayed on the monitor 108, and the audio is output to the speaker 1
09 is reproduced. In addition, the BS digital broadcast receiver 10
In 0, an IEEE 1394 interface function indicated by reference numeral 104 is mounted as connection means. Also, CPU
At 105, the system control of the entire BS digital broadcast receiver is performed.

The terrestrial digital broadcast adapter 200 receives an RF signal via a terrestrial antenna 205, and converts the RF signal into an OFDM demodulator 201, that is, a terrestrial tuner and an OFDM demodulator which is a terrestrial digital broadcast transmission system. The port stream is played. The reproduced transport stream is I
The signal is input to the EEE1394 interface 202 and output from the digital terrestrial broadcasting adapter 200. Also,
The CPU 203 controls the system of the digital terrestrial broadcasting adapter 200. The IEEE 1394 interfaces 104 and 202 can transmit and receive not only transport streams but also various data and commands. The terrestrial transport stream output from the terrestrial digital broadcast adapter 200 is transmitted to the BS 1394 interface 100 of the BS digital broadcast receiver 100.
04 and received on the ground are IEEE13
Through the 94 interface 104, the video and audio are reproduced through the transport decoder 102 and the AV decoder 103 in the same manner as the reception of the BS digital broadcast.

The terrestrial digital broadcast can be received by the BS digital broadcast receiver by the above-mentioned route.
The problem is how to select a channel with respect to 00 and how to pass the channel selection information. In order to select a terrestrial digital broadcast in this receiving system, a channel is set from the BS digital broadcast receiver 100 to the terrestrial digital broadcast adapter 200. BS digital broadcast receiver 100 is IE
A physical channel can be set by transmitting frequency information corresponding to the channel to the terrestrial digital broadcast adapter 200 using an EE1394 tuner command. Based on the frequency information transmitted from the BS digital broadcast receiver 100, the terrestrial digital broadcast adapter 200 loads selection information necessary for channel selection from the EEPROM 204 in which channel selection information corresponding to the frequency is stored. The value can be set in the OFDM demodulator 201 and the channel can be selected.

EEP of digital terrestrial broadcasting adapter 200
In the ROM 204, necessary for selecting a channel,
Information necessary for selecting a frequency, a mode, a guard interval, or other channels is stored. For example, a modulation method and the like can be stored.

On the other hand, also in the BS digital broadcast receiver 100, information for selecting a channel of the terrestrial digital broadcast adapter 200 is stored in the EEPROM 106. The BS digital broadcast receiver 100 uses this EEP
By transmitting the frequency to the terrestrial digital broadcast adapter 200 based on the frequency corresponding to the channel stored in the ROM 106, it is possible to select a channel. B
The EEPROM 106 of the S digital broadcast receiver 100 stores a frequency, a signal strength when the channel is set, an error rate, and a transport ID (TS-ID).

Next, a flow of channel preset in the digital broadcast receiving system according to the present embodiment will be described. FIG. 2 is a flowchart for explaining the flow of channel preset in the digital broadcast receiving system according to the present embodiment. FIGS. 5 and 4 show the EEPROM 106 and the BS 106 of the BS digital broadcast receiver 100 and the terrestrial digital broadcast adapter 200, respectively.
FIG. 4 is a memory map diagram showing contents of information stored in 204.

First, the BS digital broadcast receiver 100 inputs a channel preset. Upon receiving the input, the BS digital broadcast receiver sets a predetermined terrestrial frequency, for example, channel 1 which is the lowest frequency, to an initial value, and uses the DSIT command of the 1394 tuner command to set the frequency information. Send to terrestrial digital broadcast adapter 200. Terrestrial digital broadcasting adapter 200
Receives the frequency setting, turns on the search flag,
Tune to the specified physical channel.

Next, it is checked using the setting flag of the EEPROM 204 whether the frequency is already a channel preset frequency. If the setting flag is set (for example, 1), it means that the information for selecting the channel has been preset in the EEPROM 204. E is still at the time of the first channel preset
Since no tuning information is stored in the EPROM 204, it is checked whether the mode and the guard interval of the frequency can be changed to predetermined values, respectively, to determine whether reception is possible. For example, if there are three types of modes and four types of guard intervals, a total of twelve types are checked at the set frequency. If the channel is not preset at the set frequency, the mode and the initial value of the guard interval are set and OFDM demodulation is performed.

Next, the presence or absence of a received signal is checked. Check if you can receive within a certain time, and if you can not receive,
Change the mode and guard interval values and re-use OFDM
Demodulate and check if it can be received. This operation is performed until the last mode, the guard interval, and when reception is not possible, a flag no_
Set the RF flag (or current_avai
The flag is reset), the Strength is set to less than 128 indicating a poor reception condition, the BER at that time is set to a status, the status search flag is turned off, and the channel selection operation of the terrestrial digital broadcast adapter is terminated. .

If the signal has been successfully received, no_RF, which is a flag indicating that the signal has not been received, is reset, and the strength at that time is set to 192 or more if the reception is good, and to 128 or more if the reception is another step. These values are
The digital terrestrial broadcast adapter 200 defines the bit error rate (BER), C / N, and other signal information.
Further, it has the BER at that time as status information.
For example, as shown in FIG. 4, the setting frequency, the mode, and the guard interval are stored in the EEPROM 204, and a setting flag indicating that the channel is preset is set.

When the set frequency is preset, the mode and guard interval information corresponding to the frequency are loaded from the EEPROM 204 and OFDM demodulated. Next, the presence / absence of a received signal is determined. In the case where a received signal is present, processing is performed by the method described above. When there is no received signal, the same processing as when there is no channel preset is performed, and it is checked from the mode and the initial value of the guard interval whether the signal can be received. If reception is not possible even if the mode and guard interval are changed, the EEPROM 2
The setting flag in which the tuning information of the frequency 04 is stored is reset.

On the other hand, the BS digital broadcast receiver 100 determines whether the terrestrial digital broadcast adapter 200 is searching for the frequency sent by the DSIT command or whether the search has been completed. Check using. A status command is used for a status request from the BS digital broadcast receiver 100 to the terrestrial digital broadcast adapter 200. The Status response from the terrestrial digital broadcast adapter 200 includes a searching flag (Searching). The BS digital broadcast receiver 100 sets the flag to 0 if the searching flag is set to 0 when the search is completed, for example. By detecting whether or not the search has been completed, it can be determined whether or not the search has been completed. If the search is not completed, the process returns to the status request step to the terrestrial digital broadcast adapter 200, and if the search is completed, the process proceeds to the next step. The Status response obtained by the BS digital broadcast receiver 100 from the terrestrial digital broadcast adapter 200 by the Status command includes no_RF (or current) indicating the presence or absence of a received signal.
_Available flag), a strength (Strength) indicating the signal strength, and a BER indicating the bit error rate at that time. Whether or not the terrestrial digital broadcast adapter can receive the signal of the set frequency can be checked by the no_RF flag. No_RF = 0 indicates that the signal can be received, and no_RF = 1 indicates that the signal cannot be received. The reception status can be known from the strength set on the terrestrial digital broadcast adapter side. When the reception status is 192 or more, the reception status is good.
When the value is less than 92 and 128 or more, the reception state is another step,
If it is less than the above, the reception state is poor.

When there is a received signal, the received transport stream is transmitted to the terrestrial digital broadcast adapter 200.
To the BS digital broadcast receiver 100, the BS digital broadcast receiver can acquire the transport stream ID (TS-ID) of the transmitted stream.

In the case of terrestrial digital broadcasting, only the frequency may be changed at the relay station, and the same TS-ID may be transmitted on a plurality of channels. That is, for example, the same program may be transmitted on channel 2 and channel 10. Here, a method will be described in which, when the same program is transmitted, a channel with few errors is stored in the EEPROM 106 as a channel preset value.

First, when the terrestrial digital broadcast adapter 200 can receive and the BS digital broadcast receiver 100 can acquire the TS-ID from the stream transmitted from the terrestrial digital broadcast adapter 200, the same TS-ID has already been obtained.
It is determined whether or not the channel information is stored in the EEPROM 106. If no broadcast signal having the same TS-ID has been received in the channel preset operation up to that time, the same TS-ID is stored in the EEPROM 106.
Since the channel information of the ID is not stored, it is determined as NO, and the BS digital broadcast receiver 100 EEPs the channel, frequency, Strength, and BER at that time.
The information is stored in the ROM 106, for example, as shown in FIG.

Next, when the same TS-ID broadcast signal is received, since the same TS-ID channel information is stored in the EEPROM 106, the strength or BER of the channel and the strength of the currently received broadcast signal are stored. Alternatively, the BER is compared, and the channel information in the better reception state is left in the EEPROM 106. For example, in the case of comparing only with the strength, if the strength value of the channel already stored in the EEPROM 106 is 150 and the strength value of the broadcast signal received this time is 199, the reception state of the current reception is better. Already E
All the channel selection information stored in the EPROM 106 is replaced with the current channel selection information. As a result, the best channel selection information in the channel selection of the same TS-ID can be left in the EEPROM 106. It is also possible to leave both pieces of information as long as the channel selection state is the same, to select both channels at the time of channel selection, and to use the better one of them.

Next, it is determined whether or not the frequency transmitted to the terrestrial digital broadcast adapter 200 has completed the last frequency to be channel-preset. If there is another frequency to be channel-preset, the next frequency to be set is determined. Set and set the frequency to terrestrial digital broadcast adapter 2
Move to the step of transmitting to 00. When the set frequency has completed the last frequency of the channel preset, the processing of the channel preset ends.

In the step of judging the presence or absence of a reception signal on the side of the BS digital broadcast receiver 100, if there is no reception signal, the determination becomes NO, and the process proceeds to the process of setting the next frequency.
The process proceeds to the step of transmitting the frequency to the terrestrial digital broadcast adapter 200, and the same processing as described above is performed.

According to the above processing flow, the frequency set from the BS digital broadcast receiver 100 and the channel selection information to be received by the terrestrial digital broadcast adapter 200 are stored in each E.
In the future channel setting, only the frequency corresponding to the channel is transmitted from the BS digital broadcast receiver 100 to the terrestrial digital broadcast adapter 200, and the mode and guard interval according to the frequency are stored in the EPROMs 106 and 204. This can be set by the adapter 200, and the channel can be set from the BS digital broadcast receiver 100. That is, the BS digital broadcast receiver 100 and the terrestrial digital broadcast adapter 200 can share the channel setting information through the set frequency.

Further, by adopting such a processing flow this time, a special command other than the IEEE 1394 tuner command which is currently standardized is not used.
It is easy to achieve compatibility between companies.

Next, the case where the channel preset is completed and the channel of the terrestrial digital broadcast adapter 200 is set from the normal BS digital broadcast receiver 100 is shown in FIG.
This will be described with reference to FIG. Also in this case, the terrestrial digital broadcast adapter 200 performs tuning and OFDM demodulation according to the same flow as that at the time of channel preset.

First, a channel to be selected is input from the BS digital broadcast receiver 100. The channel information is E
Whether or not the data is stored in the EPROM 106 is checked using the set frequency. If it is not stored, it cannot be received, so it indicates that it cannot be received and terminates.

When the channel information is stored in the EEPROM 106, a frequency corresponding to the channel is loaded from the EEPROM 106, and the frequency is transmitted to the terrestrial digital broadcast adapter 200 using a DSIT command. On the terrestrial digital broadcast adapter 200 side, the same operation as at the time of channel preset is performed, first the search flag is turned on, and the frequency transmitted by the DSIT command is tuned to the specified physical channel. Here, since the channel preset has already been completed, the mode and guard interval according to the specified frequency are set to EEP.
The data is loaded from the ROM 204 and parameter values of the OFDM demodulator are set. Check whether there is a received signal with the set value.

If the broadcast condition has not changed since the channel preset, a received signal exists (no_RF = 0).
Thus, the digital terrestrial broadcast adapter 200 has a value of “Strength128” or more as the status, and transmits the selected received stream to the BS digital broadcast receiver. The BS digital broadcast receiver 100 decodes and displays the transport stream sent from the terrestrial digital broadcast adapter 200.

On the other hand, when there is no received signal, the mode at the time of channel preset or the guard interval may be changed. Therefore, it is checked whether the mode and the guard interval can be changed within a predetermined range and reception can be performed again. If reception is not possible even after changing to the last mode or guard interval, no_RF = 1,
The status information of less than Strength 128 is B
Return to the S digital broadcast receiver and end. At this time, the setting flag indicating the completion of the channel preset is reset.

On the other hand, on the BS digital broadcast receiver 100 side, after transmitting the frequency to the terrestrial digital broadcast adapter 200 using the DSIT command,
A request is made to the terrestrial digital broadcast adapter 200 to determine whether frequency selection has been performed on the 00 side. As in the case of the channel preset, it is checked whether the search is completed by checking the search flag in the status information. If the search is not completed, the status of the terrestrial digital broadcast adapter 200 is requested again to determine whether the search is being performed. Find out. When the search is completed, the presence or absence of a received signal is determined by n in the status information.
Check with the o_RF flag. When there is a received signal, a transport stream comes in from the terrestrial digital broadcast adapter. The stream is decoded by the transport decoder 102, and is further decoded by the AV decoder 103 to reproduce video and audio on a monitor and a speaker. I do.

If there is no received signal, it indicates that the signal could not be received and the process ends. Terrestrial digital broadcasting adapter 2
In the operation of 00, if it is not possible to receive using the mode and guard interval previously stored in the EEPROM 204 and it becomes possible to receive in a new mode and guard interval, the mode and guard interval are used as in the channel preset. To EEPROM2
04.

According to the above flow, the channel preset of the BS digital broadcast receiver 100 and the terrestrial digital broadcast adapter 200 can be performed. The channel preset is performed by the BS digital broadcast receiver 100 and the terrestrial digital broadcast adapter 200 respectively.
It is important that the channel selection information stored in 6, 204 is associated with, for example, even if the terrestrial digital broadcast adapter 200 preset in another region and the BS digital broadcast receiver 100 are connected. Tuning operation cannot be performed normally. Therefore, BS
The digital broadcast receiver 100 needs to store not only the channel selection information stored in the memory but also the related device information of the digital terrestrial broadcast adapter 200.

The BS digital broadcast receiver 100 uses the IEEE 1 standard to recognize the terrestrial digital broadcast adapter 200.
EUI64 (number assigned to each device) specified in 394 can be used. If a terrestrial digital broadcasting adapter different from that at the time of channel preset is connected, a new terrestrial digital broadcasting adapter is provided to the user. The fact that the channel preset operation is necessary is notified again by the connection, or the channel preset operation is automatically performed with the newly connected terrestrial digital broadcast adapter.

In the above embodiment, the terrestrial digital broadcasting adapter 200 is set so that the setting flag of the terrestrial digital broadcasting adapter 200 can be reset when the channel presetting of the terrestrial digital broadcasting adapter is performed again.
A reset means may be provided on the side.

In the above embodiment, the case where the digital broadcast adapter receives a terrestrial digital broadcast has been described. However, the digital broadcast adapter may receive another digital broadcast such as a cable television broadcast.

The command used in the above embodiment is "AV / C Tuner Model and CommandSet Version 1.
0 ”(Document 1),“ AV / C Tuner Broadcast System Speci ”
fication-Digital Video Broadcast (DVB) Version
1.0 ”(Document 2),“ Enhancements to the AV / C Tuner ”
Broadcast System Specification-Digital Video Bro
adcast (DVB) Version 1.0 ”(Document 3)
It is based on the tuner command standard of the trade association.

Further, in the above embodiment, the connection means is described as being an IEEE1394 interface. However, the connection means is not limited to the IEEE1394 interface, but may be another communication means having a predetermined communication format. May be used.

[0046]

As described above, according to the present invention, the frequency of the channel setting information between the terrestrial digital broadcasting adapter and the BS digital broadcasting receiver is set by using a standardized command. Information necessary for channel setting at a frequency and frequency information are stored in an EEPROM of a terrestrial digital broadcast adapter, and a state of whether or not a channel can be set at the frequency is similarly stored in an EEPROM of a BS digital broadcast receiver. Accordingly, there is an effect that information on whether or not a channel can be set at the frequency can be shared with each other.

According to the present invention, when a channel is set, a search is performed using a part of the channel preset function of the terrestrial digital broadcast adapter even when the guard interval or mode is changed at the set frequency. In this case, the mode and the guard interval can be set again so that the signal can be received.

According to the present invention, when there is a program with the same TS-ID, that is, the same content at the time of channel presetting, a program with a good error rate is stored as channel setting information in the EEPROM of the BS digital broadcast receiver. There is an effect that can be.

[Brief description of the drawings]

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

FIG. 2 is a flowchart for explaining the operation of channel preset in the digital broadcast receiving system according to the embodiment of the present invention;

FIG. 3 is a flowchart for explaining channel setting operation in the digital broadcast receiving system according to the embodiment of the present invention;

FIG. 4 is a diagram showing a memory map of an EEPROM on a terrestrial digital broadcast adapter side of the digital broadcast receiving system according to the embodiment of the present invention;

FIG. 5 is a diagram showing a memory map of an EEPROM on a BS digital broadcast receiver side of the digital broadcast receiving system according to the embodiment of the present invention;

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 BS digital broadcast receiver 101 demodulation / decoding circuit 102 transport decoder 103 A / V decoder 104 1394 interface 105 CPU 106 EEPROM 107 BS antenna 200 terrestrial digital broadcast adapter 201 OFDM demodulator 202 1394 interface 203 CPU 204 EEPROM 205 terrestrial antenna

Claims (6)

[Claims] 1. A digital broadcast adapter for receiving a digital broadcast signal, and a digital broadcast receiver connected to the digital broadcast adapter via connection means and reproducing the digital broadcast signal received by the digital broadcast adapter. A channel setting method for setting information for instructing a channel of a digital broadcast signal to be received from the digital broadcast receiver to the digital broadcast adapter in the digital broadcast receiving system. A designated frequency transmission step of transmitting frequency information designating a frequency to the digital broadcast adapter via the digital broadcast adapter, and setting and receiving parameters for tuning and demodulating the digital broadcast adapter receiving the frequency information to a designated frequency. Check for signal A receiving signal detecting step, and when there is a receiving signal in the receiving signal detecting step, storing the parameter in the digital broadcasting adapter by pairing the parameter other than the frequency necessary for reception with the designated frequency. And the digital broadcast receiver stores information indicating a reception state at that time and identification information of a transport stream included in a received signal in a pair with the designated frequency in the storage means in the digital broadcast receiver. And storing the information in the channel setting method. 2. The channel setting method according to claim 1, wherein, in the information storage step, information indicating a reception state and identification information of a transport stream included in a reception signal are paired with the designated frequency. When storing in the storage means in the digital broadcast receiver, the same identification information as the identification information of the transport stream to be stored is already stored in the storage means in the digital broadcast receiver in pairs with different frequencies, And when the reception condition at the designated frequency to be newly stored is better than the reception condition at the different frequency already stored, the designated frequency at which the different frequency already stored is to be newly stored At the different frequency that has already been stored. By rewriting the information indicating the state to the information indicating the reception state at the designated frequency to be newly stored, the information indicating the reception state and the identification information of the transport stream included in the received signal are paired with the specified frequency. Storing in a storage means in the digital broadcast receiver. 3. A digital broadcast adapter for receiving a digital broadcast signal, and a digital broadcast receiver connected to the digital broadcast adapter via connection means and reproducing the digital broadcast signal received by the digital broadcast adapter. In the digital broadcast receiving system, the digital broadcast receiver, when setting a channel for setting information for instructing a channel of a digital broadcast signal received from the digital broadcast receiver to the digital broadcast adapter, the connection means The digital broadcast adapter sends frequency information specifying a frequency to the digital broadcast adapter via the digital broadcast adapter.When the digital broadcast adapter receives the frequency information, the digital broadcast adapter tunes to the specified frequency and sets parameters for demodulation. The presence or absence of a received signal When there is a signal, the parameters other than the frequency required for reception are stored in a storage means in the digital broadcasting adapter in a pair with the designated frequency, and information indicating a reception state; Outputting a transport stream included in the signal to the digital broadcast receiver via the connection means, wherein the digital broadcast receiver has information indicating the reception state;
And when a transport stream included in the received signal is received, information indicating a reception state and identification information of the transport stream included in the received signal are paired with the designated frequency and stored in the digital broadcast receiver. A digital broadcast receiving system, which is stored in a means. 4. The digital broadcast receiving system according to claim 3, wherein the digital broadcast receiver detects the connection when the digital broadcast adapter not connected to the digital broadcast receiver is connected. A digital broadcast receiving system for displaying on the display means that the channel setting should be performed, or for automatically performing a channel setting operation. 5. The channel setting method according to claim 1, wherein the connection unit is an IEEE 1394 interface. 6. The digital broadcast receiving system according to claim 3, wherein the connection unit is an IEEE 1394 interface.