JP2012060206A - Schedule execution apparatus and schedule execution method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more reliably execute a schedule of broadcast programs.SOLUTION: A schedule execution apparatus 100 includes: a time error calculation section 25 for setting current time acquired on a first frequency as reference time, adding an elapsed time from the reference time to the acquisition of current time on a second frequency to the reference time, and calculating as a time error a difference between the current time acquired on the second frequency and the time resulting from the addition of the elapsed time to the reference time; a schedule setting section 21 for setting schedule information; and a schedule execution section 23 for, in executing the schedule, if the number of simultaneously selectable broadcast programs is exceeded and if the frequency on which a scheduled broadcast program is to be broadcast is different from the frequency on which a currently selected broadcast program is broadcast, executing the schedule according to the time error and current time included in a signal broadcast on the currently selected frequency.

Description

  The present invention relates to a reservation execution device and reservation execution method for executing reservation of a broadcast program, and more particularly to a reservation execution device and reservation execution method capable of more reliably executing reservation of a reserved broadcast program.

  In recent years, television broadcasting has shifted from analog broadcasting to digital broadcasting in countries around the world. In digital broadcasting, information necessary for channel selection of a broadcast program in a digital broadcast receiver is transmitted together with the broadcast program as channel selection information. The viewer can display the channel selection information on the display screen of the digital broadcast receiver and use it for confirmation of broadcast programs, viewing reservation, recording reservation, and the like.

  When a digital broadcast is received and a desired broadcast program is reserved for viewing from the received signal, for example, a digital broadcast receiver with a viewing reservation function is used. This digital broadcast receiver with a viewing reservation function designates a broadcast program that the viewer desires to view from the received signal by an input operation from a remote control or the like, and performs a channel selection operation for the broadcast program at a designated time. Executed.

  As a reservation execution operation of a digital broadcast receiver, one that performs a channel selection operation at a time designated with reference to a clock built in the digital broadcast receiver body is generally used.

  By the way, in a television broadcast that is shifting from an analog broadcast to a digital broadcast, the time information included in a signal broadcast on a certain frequency is included in a signal broadcast on a frequency different from the certain frequency. It does not necessarily match the time information. For this reason, for example, in a digital broadcast receiver equipped with only one tuner, the frequency at which the broadcast program reserved for viewing is broadcasted and the broadcast that the viewer is viewing at the time zone when the broadcast program reserved for viewing is broadcast. When the frequency at which the program is broadcast is different, reservation execution of the broadcast program reserved for viewing is performed based on time information transmitted at the frequency at which the broadcast program being viewed by the viewer is broadcast. Reservation is not executed at the actual time when the reserved broadcast program is started, that is, the broadcast program currently viewed at the time when the reserved broadcast program is started may not be switched to the broadcast program reserved for viewing. In order to accurately reserve and execute the program, it is necessary to devise a unique technique for the digital broadcast receiver.

  Patent Document 1 discloses a reservation function including means for correcting a time at which reservation execution is started based on a time error between a clock built in the digital broadcast receiver main body and time information included in the digital broadcast signal. An attached digital broadcast receiver is disclosed.

JP 2005-303799 A

  However, the conventional digital broadcast receiver has the following problems.

  In other words, since the digital broadcast receiver of Patent Document 1 is premised on that a clock is built in the receiver body, the above-described problem has not been solved in a receiver that does not have a clock.

  An object of the present invention is to provide a reservation execution apparatus and a reservation execution method capable of more reliably executing a reservation for a broadcast program reserved (viewing reservation, recording reservation, etc.).

  The reservation execution device of the present invention, when acquiring a signal broadcast on a selected frequency, a time acquisition unit for acquiring a current time included in the signal, and a current time acquired at a first frequency Is set as a reference time, and the current time acquired at the second frequency is added to the reference time by adding an elapsed time from the reference time until the current time is acquired at a second frequency different from the first frequency. A time error calculating unit that calculates a difference between the reference time and the elapsed time as a time error, and reservation setting that sets reservation information including channel selection information of the broadcast program and broadcast date and time of the broadcast program When the reservation is executed, the number of broadcast programs that can be simultaneously selected exceeds the frequency at which the broadcast program set to be reserved is broadcast and the currently selected broadcast program is being broadcast. Frequency If made, said time error, and the current time contained in the signal being broadcast on a frequency that is currently selected channel, a reservation execution unit for executing the reservation using, consisting of.

  Further, the reservation execution method of the present invention includes a current time acquisition step of acquiring a current time included in the signal when acquiring a signal broadcast on a selected frequency, and acquisition at a first frequency. The current time is set as a reference time, and an elapsed time from the reference time until the current time is acquired at a second frequency different from the first frequency is added to the reference time and acquired at the second frequency. A time error calculating step for calculating a difference between a current time to be calculated and a time obtained by adding the elapsed time to the reference time as a time error, and setting reservation information including channel selection information of the broadcast program and broadcast date and time of the broadcast program The reservation setting step, and the frequency at which the broadcast program with the reserved setting is broadcast and the frequency at which the currently selected broadcast program is broadcast are different from each other, the time error and the current selection. And the current time included in the signal being broadcast on a frequency that is, the reservation execution step of executing the reservation using, consisting of consisting of.

  Further, the time error calculation unit in the reservation execution device of the present invention sets the reference time and calculates the time error at the time of the first scan.

  According to the reservation execution device and the reservation execution method of the present invention, the reference time is set, the error (time error) of the current time that occurs between different frequencies with respect to the set reference time is calculated, and the reservation is executed simultaneously. When the number of broadcast programs that can be selected is exceeded and the frequency at which the reserved program is broadcast is different from the currently selected frequency, the calculated time error and the currently selected frequency are Reservation is executed using the current time included in the signal being broadcast, so it is possible to more reliably execute reservations for reserved broadcast programs regardless of errors in the current time that occur between different frequencies. It becomes.

  The reservation execution apparatus of the present invention is characterized in that the time error is updated at the time of background scanning.

  In addition to the effects described above, according to the reservation execution device of the present invention, the time error of the service list established at the first scan at the time of background scan or at the time of the previous background scan can be updated. Even if there is a change in the time error calculated during the first scan or the previous background scan, the change can be adjusted. Regardless, the reserved broadcast program can be reserved more reliably.

  Further, the reservation execution apparatus of the present invention includes a storage unit that stores the selected frequency and a time error in the selected frequency as one set, and a plurality of the sets at the same frequency as a time error history. The time error calculation unit further determines the reliability of the time error calculated during the background scan based on the time error history, and determines whether to update the time error calculated during the background scan. It is characterized by doing.

  The reservation execution apparatus of the present invention is characterized in that, among the current times acquired, the current time acquired first is set as a reference time.

  In addition to the above-described effect, according to the reservation execution device of the present invention, the reliability of the time error calculated using the time error history is determined, and it is determined whether to update the calculated time error. Since the error update accuracy can be improved, it is possible to more reliably reserve a reserved broadcast program regardless of an error in the current time that occurs between different frequencies.

  According to the reservation execution apparatus and the reservation execution method of the present invention, the reference time is set, the error (time error) of the current time that occurs between different frequencies with respect to the set reference time is calculated, and selected at the same time when the reservation is executed. When the number of broadcast programs that can be broadcasted exceeds the limit and the frequency at which the reserved program is broadcast is different from the currently selected frequency, it is broadcast on the calculated time error and the currently selected frequency. Since the reservation is executed using the current time included in the received signal, the reserved broadcast program can be more reliably reserved regardless of the error in the current time that occurs between different frequencies. .

  In addition, it is possible to update the time error of the service list established during the initial scan during the background scan or during the previous background scan, and is calculated during the initial scan or the previous background scan in the daily operation of the broadcasting station. Even if there is a change in the time error, the change can be adjusted, so the reserved broadcast program can be reserved more reliably regardless of the change in the current time error that occurs between different frequencies. It becomes possible to do.

  In addition, the reliability of the time error calculated using the time error history is judged, and the update accuracy of the time error can be improved by judging whether or not to update the calculated time error. This makes it possible to more reliably reserve a reserved broadcast program regardless of the error in the current time that occurs in the above.

1 is a block diagram showing a configuration of a digital broadcast receiver according to Embodiment 1 of the present invention. The figure which shows an example of the frequency table used at the time of the first scan which the memory | storage part of the digital broadcast receiver which concerns on Example 1 of this invention hold | maintains. 3 is a flowchart showing an operation at the time of the first scan of the digital broadcast receiver according to the first embodiment of the present invention. The figure which shows an example of the service list which the digital broadcast receiver which concerns on Example 1 of this invention builds at the time of the first scan. 3 is a flowchart showing an operation at the time of viewing reservation of the digital broadcast receiver according to the first embodiment of the present invention. 3 is a flowchart showing an operation during background scanning of the digital broadcast receiver according to the first embodiment of the present invention. The figure which shows an example of the service list which the digital broadcast receiver which concerns on Example 1 of this invention builds at the time of a background scan. 6 is a flowchart showing another operation during background scanning of the digital broadcast receiver according to the first embodiment of the present invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

<Configuration and function of digital broadcast receiver 100>
FIG. 1 is a block diagram showing a configuration of a digital broadcast receiver according to Embodiment 1 of the present invention.

  The digital broadcast receiver 100 includes a tuner unit 11, a TS (Transport Stream) decoding unit 12, an AV (Audio & Video) decoding unit 13, an AV (Audio & Video) output unit 14, a control unit 15, and a remote control receiving unit 16. Composed. In the first embodiment, the digital broadcast receiver 100 has one tuner and one broadcast program that can be selected at the same time.

  The tuner unit 11 receives a broadcast wave broadcasted on a frequency selected based on the channel selection information set by the control unit 15, and demodulates the TS into an MPEG2 (Motion Picture Experts Group Phase 2) format TS. To the unit 12. The TS includes channel selection information including the current time in addition to video data and audio data.

  The TS decoding unit 12 filters the TS input from the tuner unit 11, outputs video data and audio data to the AV decoding unit 13, and outputs channel selection information including the current time to the control unit 15.

  The AV decoding unit 13 decodes the video data and audio data input from the TS decoding unit 13 and outputs them to the AV output unit 14.

  The AV output unit 14 outputs the video data input from the AV decoding unit 13 to a display device (not shown) such as a monitor, and outputs audio data to an audio output device (not shown) such as a speaker.

  The control unit 15 is a controller that controls the entire digital broadcast receiver 100. Details will be described later.

The remote control receiving unit 16 receives operation information from the remote control 17 based on the operation of the remote control 17 by the viewer and outputs it to the control unit 15.
<Configuration and Function of Control Unit 15>
The control unit 15 includes a reservation setting unit 21, a storage unit 22, a channel selection execution unit 23, a time acquisition unit 24, and a time error calculation unit 25. In addition, although the control part 15 is provided with another structure, description is abbreviate | omitted.

  The reservation setting unit 21 causes the storage unit 22 to store channel selection information of the broadcast program received via the remote control reception unit 16 and reservation information including the broadcast date and time of the broadcast program based on the operation of the remote control 17 by the viewer.

  The recording unit 22 stores a service list generated by the first scan, reservation information, and the like, in addition to the frequency table used during the first scan.

  When a viewer selects a different broadcast program with the remote controller 17 while the viewer is watching the broadcast program, the channel selection execution unit 23 selects channel selection information including a network ID, a TSID, a service ID, a frequency, and the like corresponding to the broadcast program. Obtained from the service list stored in the storage unit 22 and set in the tuner unit 11. Further, at the time of reservation execution, based on the reservation information stored in the storage unit 22 by the reservation setting unit 21, the service list in which the channel selection information corresponding to the start time of the reserved broadcast program is stored in the storage unit 22 And is set in the tuner unit 11. Further, at the time of the first scan or the background scan, the frequency table and the service list at the time of the first scan stored in the storage unit 22 are read, and the tuning information is set in the tuner unit 11.

  The time acquisition unit 24 acquires channel selection information including the current time input from the TS decoding unit 12 such as when watching a broadcast program by the viewer, at the time of initial scanning, at the time of background scanning, at the time of reservation execution, and the like. While being stored, the acquired channel selection information is output to the time error calculator 25.

  The time error calculation unit 25 sets one of the current times included in the channel selection information input from the time acquisition unit 24 as the reference time, and sets the set reference time and other currents input from the time acquisition unit 24. An error (time error) of the current time is calculated from the time, and the calculated time error is stored in the storage unit 22 in association with the channel selection information.

  Next, operations of the digital broadcast receiver 100 during the initial scan, viewing reservation execution, and background scan will be described with reference to FIGS.

First, the operation at the first scan performed when the viewer first turns on the power after purchasing the digital broadcast receiver 100 will be described with reference to FIGS.
<At first scan>
FIG. 2 is a diagram illustrating an example of a frequency table used in the first scan held by the storage unit of the digital broadcast receiver according to the first embodiment of the present invention. Here, for each broadcast of terrestrial digital broadcast, satellite digital broadcast, and cable digital broadcast, the frequency that the channel selection execution unit 23 sets in the tuner unit 11 at the first scan is described. Note that the frequency table at the time of the first scan is stored in the storage unit 22 when the digital broadcast receiver 100 is shipped.

  FIG. 3 is a flowchart illustrating an operation at the time of the first scan of the digital broadcast receiver according to the first embodiment of the present invention.

  When the digital broadcast receiver 100 is turned on for the first time, the channel selection execution unit 23 reads the frequency table at the first scan stored in the storage unit 22 and writes it to the tuner unit 11 in the frequency table at the first scan. Set frequency. For example, the channel selection execution unit 23 sets the frequency 474.00 MHz described in the terrestrial digital broadcast frequency list in the tuner unit 11 (step S301).

  The channel selection execution unit 23 checks whether a TS exists at the frequency set in the tuner unit 11. If there is no TS at the set frequency (No in step S302), the channel selection execution unit 23 selects another frequency described in the frequency table at the time of the first scan and sets it in the tuner unit 11. For example, a frequency 482.00 MHz different from the previously set frequency 474.00 MHz is set in the tuner unit 11 (step S301).

  If a TS exists at the frequency set in the tuner unit 11 (Yes in step S302), the TS demodulated by the tuner unit 11 is filtered by the TS decoding unit 12, and channel selection information including the current time is sent to the time acquisition unit 24. Is output. The time acquisition unit 24 stores the current time first input from the TS decoding unit 12 as a reference time in the service list of the storage unit 22 together with other channel selection information (step S303).

  The channel selection execution unit 23 ends the first scan when all the frequencies described in the frequency table at the time of the first scan are set in the tuner unit 11 (Yes in step S304).

  On the other hand, if there is a frequency not yet set in the tuner unit 11 in the frequency table at the time of the first scan (No in step S304), the channel selection execution unit 23 sets the frequency in the tuner unit 11 (step S305). .

  If a TS exists in the frequency set in the tuner unit 11 (Yes in step S306), the TS demodulated by the tuner unit 11 is filtered by the TS decoding unit 12, and channel selection information including the current time is sent to the time acquisition unit 24. Is output. The time acquisition unit 24 calculates an error (time error) between the current time input from the TS decoding unit 12 and the reference time.

  Specifically, when acquiring a signal broadcast on a frequency different from the frequency at which the reference time is acquired from the reference time, an elapsed time until acquiring the current time included in the signal is added to the reference time. When acquiring a signal broadcast on a frequency different from the frequency from which the reference time was acquired, the current time included in the signal broadcast on a frequency different from the frequency from which the reference time was acquired, and the reference time The difference between the elapsed time and the time is calculated as an error (time error) of the current time (step S307).

  For example, the time acquisition unit 24 uses a current time acquired at a frequency of 474.00 MHz (for example, 12:00: 00) as a reference time, and then selects a channel including the current time at a frequency of 482.00 MHz set in the tuner unit 11. The time required to acquire information (for example, 00:00:25) is added as the elapsed time to the reference time. Next, the time acquisition unit 24 calculates a difference (00:00:05) from the current time (for example, 12:00:30) acquired at a frequency of 482.00 MHz as an error (time error) of the current time.

  The time acquisition unit 24 stores the calculated time error in the storage unit 22 in association with other channel selection information (step S308).

  The channel selection execution unit 23 ends the first scan when all the frequencies described in the frequency table at the time of the first scan are set in the tuner unit 11 (Yes in step S309).

  On the other hand, if there is a frequency not yet set in the tuner unit 11 in the frequency table at the time of the first scan (No in step S309), the channel selection execution unit 23 sets the frequency in the tuner unit 11 (step S305). The same operation is repeated until all the frequencies described in the frequency table at the time of the first scan are set in the tuner unit 11 (steps S305 to S309).

  FIG. 4 is a diagram illustrating an example of a service list that the digital broadcast receiver according to the first embodiment of the present invention constructs during the first scan. The service list is composed of a set of channel, broadcast wave type, network ID, TSID, service ID, frequency, and time error.

  Here, the broadcast wave type indicates a terrestrial digital broadcast, a satellite digital broadcast, or a cable digital broadcast. The network ID is an identifier assigned to each network, and the TSID is an identifier assigned to a TS broadcast on a predetermined frequency belonging to a predetermined network, and there is one or more for each network ID. The service ID is an identifier assigned to each broadcast program, and one or more service IDs exist for each TSID. In FIG. 4, the current time included in the signal broadcast on the frequency 474.00 MHz is set as the reference time (time error 0 second), and the current time and the reference time included in the signal broadcast on the other frequencies. The error of the current time is stored in the storage unit 22 as a time error.

  In the present embodiment, the time information first acquired at the time of the first scan is used as the reference time (in FIG. 4, time information acquired at the frequency of 474.00 MHz). Any one of the current times included in a signal broadcast on the described frequency may be used as a reference time, and a difference from the other current time may be used as a time error.

Next, for example, after the viewing reservation is made by the viewer, the operation until the viewing reservation is executed will be described with reference to FIG.
<During viewing reservation execution>
FIG. 5 is a flowchart showing the operation at the time of viewing reservation of the digital broadcast receiver according to the first embodiment of the present invention.

  The channel selection execution unit 23 stores the channel selection information corresponding to the start time of the broadcast program reserved for viewing based on the broadcast date and time stored in the storage unit 22 by the reservation setting unit 21 in the storage unit 22. Obtained from the service list (step S501).

  The channel selection execution unit 23 determines whether or not the frequency at which the broadcast program currently being viewed by the viewer is broadcast is the same as the frequency at which the broadcast program reserved for viewing is broadcast (step S502). ).

  When the frequency at which the broadcast program currently being viewed by the viewer is broadcast and the frequency at which the broadcast program reserved for viewing is the same (Yes in step S502), the channel selection execution unit 23 allows the viewer to Based on the current time when the currently viewed broadcast program is transmitted at the broadcast frequency, the broadcast program currently reserved for viewing is changed from the currently viewed broadcast program at the time reserved for viewing (Yes in step S505). Switch channels. For example, in FIG. 4, the viewer switches to the channel 10 reserved for viewing while viewing the channel 6.

  On the other hand, when the frequency at which the broadcast program that the viewer is currently viewing is broadcasted differs from the frequency at which the broadcast program reserved for viewing is broadcast (No in step S502), the channel selection execution unit 23 stores the program. The time error stored in the service list of the unit 22 is calculated (step S503), and the time error calculated in step S503 is set to the current time at which the broadcast program that the viewer is currently viewing is transmitted at the frequency at which the program is broadcast. When the added time reaches the time reserved for viewing (Yes in step S504), the channel is switched from the currently viewed broadcast program to the broadcast program reserved for viewing. For example, in FIG. 4, when the viewer switches from channel 6 being viewed to channel 3 reserved for viewing, the channel selection execution unit 23 calculates the time error (−25 seconds) between channel 3 and channel 6 from the service list. (Step S503) When the broadcast program that the viewer is currently viewing is added to the current time being transmitted at the frequency at which the program is broadcast, and the added time is the time reserved for viewing (Yes in Step S504), The channel is switched from the currently viewed broadcast program to the broadcast program reserved for viewing.

  In the first embodiment, since it is assumed that the digital broadcast receiver 100 includes one tuner, viewing reservation is executed based on steps S502 to S505, but the tuner included in the digital broadcast receiver Steps S502 to S505 are not required unless the number of broadcast programs that can be simultaneously selected by the digital broadcast receiver when performing viewing reservation, such as when there are a plurality of channels.

Next, FIG. 6 illustrates operations during background scanning performed by the digital broadcast receiver 100 in a standby state (standby state, in a state where only the power of functional blocks necessary for performing channel scanning, such as a tuner, is turned on). Will be described.
<During background scan>
FIG. 6 is a flowchart showing an operation during background scanning of the digital broadcast receiver according to the first embodiment of the present invention.

  When the digital broadcast receiver 100 enters a standby state, the channel selection execution unit 23 operates according to the flow shown in FIG.

  The operation difference from the first scan shown in FIG. 3 is that the frequency set by the channel selection execution unit 23 in the tuner unit 11 is read from the service list constructed at the first scan, and the error time of the service list is updated. Since other operations are the same as those at the time of the first scan, a detailed description thereof is omitted here. Of course, the channel selection execution unit 23 may use again the frequency table used at the time of the background scan instead of the service list constructed at the time of the first scan.

  The error time calculation unit 25 stores the time error calculated at the time of the first scan and the background scan in the recording unit 22 each time, and in the background scan performed this time from a plurality of stored error times (error time history). The reliability of the calculated error time may be determined to determine whether to update the error time.

  FIG. 7 is a diagram illustrating an example of a service list that the digital broadcast receiver according to the first embodiment of the present invention constructs during background scanning.

  The time error 1 is the time error calculated during the initial scan, the time error 2 is the time during the initial background scan, and the time error 3 is the time error calculated during the background scan performed this time.

  The error time calculation unit 25 determines the reliability of the time error 3 calculated in the background scan performed this time from the error time (error time history) calculated in the initial scan and the initial background scan.

  For example, time error 1 and time error 2 at a frequency of 482.00 MHz are both 5 seconds, and it is determined from these time error histories that 60 seconds of time error 3 calculated at the time of the background scan performed this time is low in reliability. As a time error, the error history of 5 seconds is maintained.

  FIG. 8 is a flowchart showing another operation (operation when maintaining or updating a time error) at the time of background scanning of the digital broadcast receiver according to the first embodiment of the present invention.

  Steps S807 to S809 correspond to the above-described operation. Other steps are the same as those in the background scan shown in FIG.

  When determining the reliability of the time error calculated this time using the time error history, the frequency at which the signal including the current time set as the reference time at the time of background scanning of the digital broadcast receiver 100 is broadcast is: It is desirable to use the same frequency as the frequency at which the signal including the current time set as the reference time at the time of the first scan is broadcast. However, the present invention is not limited to this, and the signal including the current time set as the reference time is broadcast. The frequency may be different for each background scan.

  According to the reservation execution apparatus and the reservation execution method of the present invention, the reference time is set, the error (time error) of the current time that occurs between different frequencies with respect to the set reference time is calculated, and selected at the same time when the reservation is executed. Broadcasts on the calculated time error and the currently selected frequency when the number of broadcast programs that can be broadcast is exceeded and the frequency at which the reserved program is being broadcast is different from the currently selected frequency. The reservation is executed using the current time included in the signal being reserved, so that it is possible to more reliably execute the reservation of the reserved broadcast program regardless of the error in the current time occurring between different frequencies. Become.

  In addition, it is possible to update the time error of the service list established during the initial scan during the background scan or during the previous background scan, and is calculated during the initial scan or the previous background scan in the daily operation of the broadcasting station. Even if there is a change in the time error, the change can be adjusted, so the reserved broadcast program can be reserved more reliably regardless of the change in the current time error that occurs between different frequencies. It becomes possible to do.

  In addition, the reliability of the time error calculated using the time error history is judged, and the update accuracy of the time error can be improved by judging whether or not to update the calculated time error. This makes it possible to more reliably reserve a reserved broadcast program regardless of the error in the current time that occurs in the above.

  The reservation execution apparatus and the reservation execution method of the present invention set a reference time, calculate an error (time error) of a current time that occurs between different frequencies with respect to the set reference time, and can select a channel simultaneously when executing a reservation When the number of broadcast programs exceeds the limit and the frequency at which the reserved program is broadcast is different from the currently selected frequency, it is broadcast on the calculated time error and the currently selected frequency. Since the reservation is executed using the current time included in the signal, it is possible to more reliably execute the reserved broadcast program in spite of the error of the current time occurring between different frequencies. This is useful as a reservation execution technique.

DESCRIPTION OF SYMBOLS 11 Tuner part 12 TS decoding part 13 AV decoding part 14 AV output part 15 Control part 16 Remote control light-receiving part 17 Remote control 21 Schedule setting part 22 Storage part 23 Channel selection execution part 24 Time acquisition part 25 Time error calculation part 100 Digital broadcast receiver

Claims (6)

A time acquisition unit for acquiring a current time included in the signal when acquiring a signal broadcast on the selected frequency;
Set the current time acquired at the first frequency as the reference time,
Elapsed time from acquiring the current time at a second frequency different from the first frequency from the reference time, to the reference time,
A time error calculating unit that calculates a difference between a current time acquired at the second frequency and a time obtained by adding the elapsed time to the reference time as a time error;
A reservation setting unit for setting reservation information including channel selection information of a broadcast program and broadcast date and time of the broadcast program;
When the reservation is executed, the number of broadcast programs that can be selected at the same time is exceeded, and
When the frequency at which the preset broadcast program is broadcast and the frequency at which the currently selected broadcast program is broadcast are different,
A reservation execution unit that executes the reservation using the time error and a current time included in a signal broadcast on the currently selected frequency;
A reservation execution device comprising: The time error calculator is
The reservation execution apparatus according to claim 1, wherein the reference time is set and the time error is calculated at the first scan. The time error calculator is
The reservation execution apparatus according to claim 1, wherein the time error is updated during a background scan. The selected frequency and the time error in the selected frequency as one set,
A storage unit that stores a plurality of sets of the same frequency as time error history;
The time error calculator is
4. The reliability of the time error calculated during the background scan is determined based on the time error history, and it is determined whether to update the time error calculated during the background scan. Reservation execution device. The reservation execution apparatus according to claim 1, wherein the current time acquired first is set as a reference time among the acquired current times. A current time acquisition step of acquiring a current time included in the signal when acquiring a signal being broadcast on the selected frequency; and
Set the current time acquired at the first frequency as the reference time,
Elapsed time from acquiring the current time at a second frequency different from the first frequency from the reference time, to the reference time,
A time error calculating step of calculating a difference between a current time acquired at the second frequency and a time obtained by adding the elapsed time to the reference time as a time error;
Reservation setting step for setting reservation information consisting of channel selection information of a broadcast program and broadcast date and time of the broadcast program;
When the frequency at which the reserved broadcast program is broadcast is different from the frequency at which the currently selected broadcast program is broadcast,
A reservation execution step of executing the reservation using the time error and a current time included in a signal broadcast on the currently selected frequency;
Reservation execution method consisting of

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