JP5155787B2 - Broadcast receiver for mobile objects - Google Patents

Description

  The present invention relates to a mobile broadcast receiving apparatus, and more particularly to a mobile broadcast receiving apparatus having a function of time shift reproduction.

  2. Description of the Related Art Conventionally, a mobile receiver such as a vehicle is equipped with a TV tuner or a radio tuner, thereby receiving and reproducing a broadcast such as a digital terrestrial television broadcast or a radio broadcast (for example, DAB: Digital Audio Broadcast). Was adopted.

  Among such broadcast receiving apparatuses, there is a model in which so-called time shift reproduction (chase reproduction) is possible.

  Here, in a model capable of performing such time-shifted reproduction, the recorded broadcast content (for example, a TV program) is recorded in real time while the recorded broadcast content is broadcast. Thus, it is possible to reproduce with a delay of a predetermined time shift time from the time of reception.

  When such a time-shift playback function is installed in a vehicle-mounted broadcast receiving device, for example, a driver seat user who cannot watch a television broadcast while the vehicle is traveling is recorded while traveling. It was possible to view the contents of the broadcasted TV broadcast while it was stopped.

  However, even when such time-shifted reproduction is performed, the freshness of information provided to the user will continue to be impaired if the broadcast content is delayed from the real-time broadcast indefinitely.

  Thus, in the broadcast receiving apparatus capable of performing this type of time-shifted reproduction, various types of time-shift reproduction have been introduced to return to real-time reproduction that immediately reproduces broadcast content after reception. The proposal was made.

  For example, in Japanese Patent Laid-Open No. 2004-26883, using a vehicle-mounted broadcast receiving apparatus whose reception state is easily changed, as shown in FIG. 7, a video (program) is recorded and recorded while the vehicle is running. By removing a portion of the received video having a bad reception state (the portion incapable of receiving in FIG. 7) and combining the remaining appropriate video for time shift reproduction, the time shift reproduction and the real time broadcast can be performed. A technique for shortening the time difference has been proposed. In FIG. 7, the time shift time is shortened from the initial 2 minutes to 15 seconds.

  In addition to this, for example, a technique for shortening the time difference between time shift reproduction and real-time broadcasting has been proposed by fast-forwarding a portion having a poor reception state.

Japanese Patent Laid-Open No. 2003-244591

  However, conventionally, it has been necessary to perform parallel processing such as video and audio editing processing and fast-forwarding processing while monitoring the reception state of the broadcast while recording the broadcast content in real time, and the information processing burden becomes excessive. There was a problem such as.

  Therefore, the present invention has been made in view of such problems, and promptly switches from time-shift playback to real-time playback according to the broadcast incapability state during time-shift playback while reducing the information processing burden. It is an object of the present invention to provide a mobile broadcast receiving apparatus that can be used.

  In order to achieve the above-described object, a mobile broadcast receiving apparatus according to the present invention is mounted on a mobile body and receives a broadcast receiving unit, and records that sequentially record the broadcast received by the receiving unit in a storage unit. By using the means, the real-time reproduction processing means capable of performing real-time reproduction of the broadcast content of the received broadcast immediately after receiving the broadcast, and the broadcast recorded by the recording means, Time-shift reproduction processing means capable of performing time-shift reproduction for reproducing the broadcast content of the received broadcast by a predetermined time shift time from the reception of the broadcast, and the time-shift reproduction processing means The broadcast unreceivable state during the time shift reproduction by the above satisfies a predetermined condition in relation to the time shift time. The time-shift playback processing means and the control means capable of controlling the real-time playback processing means so as to switch from the time-shift playback to the real-time playback. Yes.

  According to such a configuration, when the broadcast unreceivable state during the time shift reproduction satisfies a predetermined condition in relation to the time shift time, the control means controls the time. Since shift playback can be terminated and switched to real-time playback, switching from time-shift playback to real-time broadcasting is performed at a suitable timing according to the incapable reception state without requiring video / audio editing processing or fast-forward processing. be able to.

  Further, the predetermined condition may be that a ratio of a total value of broadcast incapable times to the time shift time exceeds a predetermined threshold.

  And, according to such a configuration, when the ratio of the total value of the broadcast unreceivable time to the time shift time exceeds a predetermined threshold, it is possible to switch from time shift playback to real time playback. It is possible to switch from time-shift playback to real-time playback at a more suitable timing that can minimize the user's demerits such as losing the opportunity to view broadcasts that are properly received and recorded. .

  Further, the predetermined condition is that the number of times of switching from the broadcast receivable state to the unreceivable state per time shift time exceeds a predetermined threshold, and the total value of the broadcast unreceivable time with respect to the time shift time The ratio may exceed a predetermined threshold.

  According to such a configuration, the number of times of switching from the broadcast receivable state to the unreceivable state per time shift time exceeds a predetermined threshold, and the total value of the broadcast unreceivable time with respect to the time shift time When the ratio exceeds the predetermined threshold, it is possible to switch from time-shift playback to real-time playback, so there is a user demerit that the opportunity to view a broadcast that has been properly received and recorded is missed. Switching from time-shift playback to real-time playback can be performed with less favorable timing.

  Furthermore, the predetermined condition may be that a ratio of a continuous broadcast incapable time to the time shift time exceeds a predetermined threshold.

  According to such a configuration, when the ratio of the continuous broadcast incapable time to the time shift time exceeds a predetermined threshold, switching from time shift reproduction to real time reproduction can be performed. Switching from time-shifted reproduction to real-time reproduction can be performed at a more suitable timing with less user demerits such as missing the opportunity to view received and recorded broadcasts.

  In addition, when the broadcast unreceivable state during the time shift reproduction by the time shift reproduction processing means satisfies a predetermined condition in relation to the time shift time, switching to the real time reproduction is performed. Inquiry output means for outputting an inquiry as to whether or not to perform the inquiry in a state where the user can respond, and the control means waits for a response to switch to the real-time playback in response to the inquiry output by the inquiry output means The time-shift playback processing means and the real-time playback processing means may be controlled to switch to the real-time playback.

  According to such a configuration, when the timing suitable for switching from time shift playback to real time playback is reached, it is possible to switch to real time playback after waiting for a response to an inquiry. Can be played back.

  Further, the broadcast unreceivable state during the time shift reproduction by the time shift reproduction processing means satisfies, as the predetermined condition, that a ratio of the continuous broadcast unreceivable time to the time shift time exceeds a predetermined threshold. Inquiry output means for outputting an inquiry as to whether or not to switch to the real-time playback in a state where the user can respond, and the control means is output by the inquiry output means Controls the time-shift playback processing means and the real-time playback processing means so as to switch to the real-time playback after waiting for a response to switch to the real-time playback in response to an inquiry about whether or not to switch to the real-time playback. And satisfy the predetermined condition. The time zone from the time when the time has come to the time point back by the time shift time is configured by the continuous reception disabled time and the reception enabled time following the continuous reception disabled time, and the inquiry The means can allow the user to respond to an inquiry as to whether or not to switch to the time-shifted playback when the same time as the continuous reception impossible time has elapsed since the switching to the real-time playback. The control means is configured to output as a state, and waits for a response to switch to the time shift reproduction in response to an inquiry about whether or not to switch to the time shift reproduction output by the inquiry output means, The time-shift playback processing means and the real time so as to switch to the time-shift playback It may be formed to control the Im reproduction processing means.

  According to such a configuration, when the timing suitable for switching from time shift playback to real time playback is reached, it is possible to switch to real time playback after waiting for a response to an inquiry. Can be played back. In addition, after switching to real-time playback, if switching to time-shifted playback is performed when the same time as the continuous reception impossible time has elapsed, broadcasting of the receivable time that could not be played back by switching to real-time playback The content can be reproduced by time-shift reproduction, and the user's demerit of missing the opportunity to view a broadcast that has been properly received and recorded can be eliminated.

  According to the present invention, it is possible to promptly switch from time shift reproduction to real time reproduction in accordance with a broadcast incapable state during time shift reproduction while reducing the information processing burden.

  Hereinafter, an embodiment of an in-vehicle digital broadcast receiving device mounted on a vehicle as an example of a mobile broadcast receiving device according to the present invention will be described with reference to FIGS. 1 to 6.

  As shown in FIG. 1, the in-vehicle digital broadcast receiving apparatus 1 in the present embodiment has a tuner 2 as a receiving means, and an antenna 3 is connected to the tuner 2.

  The tuner 2 can receive terrestrial digital television broadcast (hereinafter simply referred to as “television broadcast”) radio waves via the antenna 3, and can receive a signal that matches a user's desired channel from the received television broadcast radio waves. A frequency broadcast signal is extracted, and the extracted broadcast signal is output to the subsequent stage.

  Further, a CPU 5 is connected to the tuner 2, and an input operation unit 6 is connected to the CPU 5. The CPU 5 controls the tuner 2 so as to extract the broadcast signal of the channel designated by the user by the operation of the input operation unit 6.

  Further, an OFDM demodulator 7 is connected to the subsequent stage of the tuner 2, and a broadcast signal output from the tuner 2 is input to the OFDM demodulator 7.

  Then, the OFDM demodulator 7 performs an analog-digital (A / D) conversion process, an OFDM (Orthogonal Frequency Division Multiplexing) demodulation process, and an error correction process on the input broadcast signal to generate a transport stream. (TS) is acquired, and the acquired transport stream is output to the subsequent stage.

  A TS decoder 8 is connected to the subsequent stage of the OFDM demodulator 7, and the transport stream output from the OFDM demodulator 7 is input to the TS decoder 8.

  The TS decoder 8 can extract video data and audio data from the input transport stream, and can output the extracted video data and audio data to a subsequent stage.

  An MPEG decoder 10 is connected to the subsequent stage of the TS decoder 8, and video data and audio data output from the TS decoder 8 are input to the MPEG decoder 10.

  Then, the MPEG decoder 10 cancels MPEG compression of the input video data and audio data, and outputs the video data and audio data whose compression has been canceled to the subsequent stage.

  The video DAC 11 and the audio DAC 12 are respectively connected to the subsequent stage of the MPEG decoder 10. The video DAC 11 receives the video data output from the MPEG decoder 10, and the audio DAC 12 outputs the audio data output from the MPEG decoder 10. Are entered respectively.

  The video DAC 11 performs digital-analog (D / A) conversion processing on the video data input from the MPEG decoder 10 side, and outputs the video data after the D / A conversion processing to the subsequent stage.

  The audio DAC 12 performs D / A conversion processing on the audio data input from the MPEG decoder 10 side, and outputs the audio data after the D / A conversion processing to the subsequent stage.

  A display 14 such as a liquid crystal display is connected to the subsequent stage of the video DAC 11, and a video corresponding to the video data output from the video DAC 11 is displayed on the display 14.

  A speaker 15 is connected to the subsequent stage of the audio DAC 12, and the speaker 15 outputs audio corresponding to the audio data output from the audio DAC 12.

  In the present embodiment, the CPU 5 is connected to the TS decoder 8 and functions as a real-time reproduction processing means.

  That is, when reproducing the TV broadcast, if the input operation unit 6 is not instructed to execute time-shift reproduction described later, the CPU 5 sends the latest video data extracted from the transport stream to the TS decoder 8. And the audio data are output to the MPEG decoder 10 as they are.

  Thereby, the in-vehicle digital broadcast receiving apparatus 1 can perform real-time reproduction in which the broadcast content of the television broadcast received by the tuner 2 is reproduced (video display and audio output) immediately after reception.

  Further, in the present embodiment, the TS decoder 8 is connected to a hard disk drive (HDD) 17 as a storage unit.

  In the present embodiment, the CPU 5 also functions as a recording unit. By controlling the TS decoder 8, the video data and audio data extracted by the TS decoder 8 are sequentially stored in the hard disk drive 17, so that the tuner 2 The received television broadcast is sequentially recorded on the hard disk drive 17.

  Furthermore, in the present embodiment, the CPU 5 functions as a time shift reproduction processing unit.

  That is, when the user instructs time-shift playback by operating the input operation unit 6, the CPU 5 controls the TS decoder 8 to replace these latest video data and audio data extracted by the TS decoder 8. Video data and audio data received and recorded in the hard disk drive 17 before a predetermined time shift time (predetermined in the present embodiment) set in advance from the data of the video data is acquired from the hard disk drive 17 and MPEG decoder 10 is output.

  Thus, the in-vehicle digital broadcast receiving apparatus 1 uses the broadcast recorded in the hard disk drive 17 to delay the broadcast content of the received television broadcast by a predetermined (constant) time shift time from the time of receiving the television broadcast. Thus, it is possible to perform time shift reproduction.

  Furthermore, in the present embodiment, the CPU 5 and the OFDM demodulator 7 are connected to each other, and the CPU 5 determines that the reception state of the television broadcast is appropriate based on the result of the error correction processing by the OFDM demodulator 7. The reception state determination is performed to determine whether the state is a receivable state that can be regarded as being made, or the unreceivable state that is a state that can be regarded as not being properly received. At this time, if the error correction rate calculated by the error correction processing is equal to or less than the threshold, the CPU 5 determines that the reception is possible, and if the error correction rate exceeds the threshold, the reception is not possible. You may make it determine.

  Furthermore, the CPU 5 determines that the broadcast unreceivable state during the time shift reproduction is based on a determination result of the reception state determination during the time shift reproduction in accordance with a predetermined condition (hereinafter referred to as a switching condition) in relation to the time shift time. ), That is, a switching timing determination is performed to determine whether the timing is suitable for switching from time shift playback to real time playback.

  In the present embodiment, the CPU 5 is connected to the video DAC 11 and functions as an inquiry unit.

  That is, when the switching condition is satisfied as a result of the switching time determination, the CPU 5 outputs an inquiry as to whether or not to switch from time shift reproduction to real time reproduction as a state in which the user can respond. It is supposed to be. Specifically, the CPU 5 may display on the display 14 character information for inquiring whether or not to switch from time shift playback to real time playback and an operation button for selecting (responding) whether or not to switch.

  Note that the CPU 5 may be configured to make an inquiry by voice output, and a response to the inquiry may be made by voice input.

  Furthermore, in the present embodiment, the CPU 5 also functions as a control unit, and when a response indicating that switching is performed through the input operation unit 6 in response to an inquiry about whether or not switching is performed, the CPU 5 performs its own time-shift playback processing. By controlling the functions as the means and the real-time reproduction processing means, the time-shift reproduction is terminated and the real-time reproduction is switched.

Here, FIG. 2 is a time chart for explaining a first example of switching time determination by the CPU 5. In this first example, as shown in FIG. 2, the switching condition is that the television broadcast unreceivable times t ₁ , t ₂ , t ₃ and t ₄ (that is, the duration of the unreceivable state) with respect to the time shift time T. ) Of the total value t ₁ + t ₂ + t ₃ + t ₄ (percentage) {(t ₁ + t ₂ + t ₃ + t ₄ ) / T} × 100 is assumed to exceed a predetermined threshold (80% in FIG. 2) Yes. In the first example, as shown in FIG. 2, when the switching condition is satisfied, the switching from the time shift reproduction to the real time reproduction is performed after waiting for a response to the inquiry. It is like that. However, in FIG. 2, it is assumed that the time from when the switching condition is satisfied to when the response is made is a very short time, and the time when the switching condition is satisfied and real-time playback. The point in time when switching to is performed is the same. In FIG. 2, it is assumed that the time from the reception of a broadcast transmitted in real time from a broadcast station (real-time broadcast in FIG. 2) to the reproduction (real-time reproduction) of the broadcast is very short, Broadcast reception timing and real-time playback timing are handled simultaneously.

FIG. 3 is a time chart for explaining a second example of the switching time determination by the CPU 5. In this second example, as shown in FIG. 3, the switching condition is that the number of times of switching from the television broadcast receivable state to the unreceivable state per time shift time T is a predetermined threshold (for example, 5 times). , greater and unreceivable time _t 1 of the television broadcast for time shift time _{T, t 2, t 3,} t 4, t 5, the sum of _{t 6} and _{t 7 t 1 + t 2 +} t 3 + t 4 + t 5 + t The ratio (percentage) of ₆ + t ₇ {(t ₁ + t ₂ + t ₃ + t ₄ + t ₅ + t ₆ + t ₇ ) / T} × 100 exceeds a predetermined threshold (60% in FIG. 3). Also in the second example, when the switching condition is satisfied, the switching from the time shift reproduction to the real time reproduction is performed after waiting for a response to the inquiry. However, in FIG. 3, for the same reason as in FIG. 2, the time point when the switching condition is satisfied and the time point when switching to the real-time playback is performed are treated as the same, and the reception of the real-time broadcast is performed. Timing and real-time playback timing are handled simultaneously.

  FIG. 4 is a time chart for explaining a third example of the switching time determination by the CPU 5. In this third example, as shown in FIG. 4, the switching condition is that the ratio (percentage) (t / T) × 100 of the television broadcast continuous reception impossible time t to the time shift time T is a predetermined threshold (FIG. 90%) in 4). Also in the third example, as shown in FIG. 4, when the switching condition is satisfied, the time-shift playback is switched to the real-time playback after waiting for a response to the inquiry. It is like that. However, in FIG. 4, for the same reason as in FIGS. 2 and 3, the time when the switching condition is satisfied and the time when switching to the real-time playback is performed are treated as the same, and real-time Broadcast reception timing and real-time playback timing are handled simultaneously.

  2 to 4, in all cases, the time when the television broadcast reception state is switched from the receivable state to the unreceivable state is set as a reference time point for the switching time determination, and T seconds (time shift time) ) A time chart for determining the switching time later is shown, but this reference time point is successively generated with time during the time shift reproduction. In other words, during the time shift reproduction, the CPU 5 continuously performs the switching timing determination with reference to a reference time point T seconds before the current time (however, time shift reproduction time point).

  Therefore, according to the present embodiment, it is possible to switch from time shift reproduction to real-time broadcasting at a suitable timing according to the incapable reception state without requiring conventional video / audio editing processing and fast-forward processing. it can.

  Further, according to the first to third examples, out of the video data and the audio data recorded in the hard disk drive 17, the video data for the unit time shift time immediately before the time when the switching condition is satisfied, and The audio data is not used for time shift reproduction since time shift reproduction is not performed after that time. However, even if video data and audio data for such a unit time shift time are sacrificed (not used), these video data and audio data have many video / audio interruptions and few parts are properly reproduced. Therefore, the user's demerit of missing the opportunity to view a properly received and recorded television broadcast can be reduced.

  Next, an example of the operation of the present embodiment will be described.

  In the initial state, it is assumed that real-time reproduction is performed and the reception state determination by the CPU 5 is performed.

  Then, from the initial state, first, as shown in step 1 (ST1) of FIG. 5, the CPU 5 controls the TS decoder 8 under the control of the TS decoder 8 in accordance with the instruction to execute the time shift reproduction using the input operation unit 6. , Start time shift playback. Thereby, processing for switching from time shift reproduction to real time reproduction is started.

  Next, in step 2 (ST2), the CPU 5 determines whether or not the ratio of the continuous television broadcast unreceivable time to the time shift time exceeds a predetermined threshold as the switching time determination based on the determination result of the reception state determination. If not, the process proceeds to step 3 (ST3). Otherwise, the process proceeds to step 5 (ST5).

  The determination in step 2 (ST2) is a third example of the switching time determination shown in FIG. The determination in step 2 (ST2) is performed at each time point (time point during time shift reproduction) when T seconds (time shift time) have elapsed from each reference time point that occurs sequentially during the time shift reproduction described above. To sequentially.

  In step 3 (ST3), the CPU 5 outputs an inquiry as to whether or not to switch to real-time playback, and whether or not the response from the user to the inquiry is a response to switch to real-time playback. Determine whether or not.

  If the result of this determination is that the response from the user is to switch to real-time playback, the process proceeds to step 4 (ST4), and the response is to not switch to real-time playback. In that case, the process proceeds to step 5 (ST5).

  In step 4 (ST4), the CPU 5 controls the TS decoder 8 to switch to real-time playback, and the process ends.

  On the other hand, in step 5 (ST5), the time shift reproduction is continued and the process is terminated.

  As described above, according to the present embodiment, when the broadcast unreceivable state during the time shift reproduction satisfies a predetermined condition in relation to the time shift time, the control of the CPU 5 Since switching to real-time playback can be performed, switching from time-shift playback to real-time broadcasting can be performed at a suitable timing according to the incapable reception state without requiring video / audio editing processing or fast-forward processing. .

  As a result, it is possible to quickly switch from time shift reproduction to real time reproduction in accordance with the broadcast unreceivable state during time shift reproduction while reducing the information processing burden.

  In addition, this invention is not limited to embodiment mentioned above, A various change is possible as needed.

  For example, when the third example of the switching time determination as shown in FIG. 4 is adopted, the time zone from the time point when the switching condition is satisfied to the time point backward by the time shift time T is The continuous reception impossible time t, and the continuous reception impossible time t following the continuous reception impossible time t.

  In such a case, the real-time broadcast contents in the time zone of the receivable time Tt cannot be viewed in the time-shift playback by switching to the real-time playback.

Therefore, in order to make it possible to view the real-time broadcast content in the time zone of the receivable time Tt in the time-shift playback, for example, as shown in FIG. From time real-time playback to time-shifted playback at time P ₂ when the same time t as the continuous reception impossible time t has elapsed since (same as time P ₁ when the switching condition is satisfied in FIGS. 4 and 6). An inquiry as to whether or not to perform switching may be output as a state in which the user can respond.

  This inquiry may be made by the CPU 5 as inquiry means.

  Then, as shown in FIG. 6, the CPU 5 as the control means waits for a response to switch to time shift playback in response to an inquiry about whether or not to switch from real time playback to time shift playback, and then switches to time shift playback. Switching may be performed. In this way, the broadcast content in real time in the time zone of the receivable time Tt enclosed by the broken line frame in FIG. 6 can be viewed by time-shift playback, and the television that is appropriately received and recorded It is possible to eliminate the disadvantage of the user that the opportunity to watch the broadcast is missed. Note that when switching from real-time playback to time-shifted broadcasting is performed in this manner, the above-described switching time determination by the CPU 5 may be performed in order to return to real-time playback thereafter.

  In addition, the present invention may be applied to broadcasts other than television broadcasts, and of course may be applied to mobile objects other than vehicles (for example, mobile phones).

The block diagram which shows embodiment of the broadcast receiver for mobile bodies which concerns on this invention The time chart for demonstrating the 1st example of switching time determination in embodiment of the broadcast receiver for mobile bodies which concerns on this invention The time chart for demonstrating the 2nd example of switching time determination in embodiment of the broadcast receiver for mobile bodies which concerns on this invention Time chart for explaining a third example of switching time determination in the embodiment of the mobile broadcast receiver according to the present invention The flowchart which shows embodiment of the broadcast receiver for mobile bodies which concerns on this invention Time chart for explaining a modification of the third example of the switching time determination in the embodiment of the mobile broadcast receiving apparatus according to the present invention Time chart for explaining an example of a time-shift playback method that has been conventionally employed

Explanation of symbols

1 In-vehicle digital broadcast receiver 2 Tuner 5 CPU
17 Hard disk drive

Claims (6)

Mounted on mobile objects,
Receiving means for receiving broadcasts;
Recording means for sequentially recording the broadcast received by the receiving means in the storage unit;
Real-time playback processing means capable of performing real-time playback of the broadcast content of the received broadcast immediately after receiving the broadcast; and
By using the broadcast recorded by the recording means, it is possible to perform time shift reproduction in which the broadcast content of the received broadcast is delayed by a predetermined time shift time from the reception of the broadcast. Time-shift playback processing means;
When the broadcast unreceivable state during the time shift reproduction by the time shift reproduction processing means satisfies a predetermined condition in relation to the time shift time, the time shift reproduction is changed to the real time reproduction. A mobile broadcast receiving apparatus comprising: control means capable of controlling the time-shift reproduction processing means and the real-time reproduction processing means so as to perform switching to The mobile broadcast receiving apparatus according to claim 1, wherein the predetermined condition is that a ratio of a total value of broadcast unreceivable time to the time shift time exceeds a predetermined threshold. The predetermined condition is that the number of times of switching from the broadcast receivable state to the unreceivable state per time shift time exceeds a predetermined threshold, and the ratio of the total value of the broadcast unreceivable time to the time shift time The broadcast receiving apparatus for mobile unit according to claim 1, wherein is exceeding a predetermined threshold value. The mobile broadcast receiving apparatus according to claim 1, wherein the predetermined condition is that a ratio of a broadcast non-reception time to the time shift time exceeds a predetermined threshold. Whether to switch to the real-time playback when the broadcast unreceivable state during the time-shift playback by the time-shift playback processing means satisfies a predetermined condition in relation to the time-shift time Inquiry output means for outputting an inquiry as to whether or not the user can respond,
The control means waits for a response to switch to the real-time playback in response to the query output by the query output means, and the time-shift playback processing means and the real-time playback to switch to the real-time playback. The mobile broadcast receiver according to any one of claims 1 to 4, wherein the mobile broadcast receiver is configured to control processing means. The broadcast unreceivable state during the time shift reproduction by the time shift reproduction processing means satisfies the predetermined condition that a ratio of the continuous broadcast unreceivable time to the time shift time exceeds a predetermined threshold. Inquiry output means for outputting the inquiry as to whether or not to switch to the real-time playback as a state in which the user can respond,
The control means waits for a response to switch to the real-time playback in response to an inquiry about whether or not to switch to the real-time playback output by the inquiry output means, and performs the switching to the real-time playback. Formed to control the time-shift playback processing means and the real-time playback processing means,
The time zone between the time point when the predetermined condition is satisfied and the time point backward by the time shift time is constituted by the continuous reception disabled time and the reception enabled time subsequent to the continuous reception disabled time. Has been
In the inquiry means, a user responds to an inquiry as to whether or not to switch to the time-shifted playback when the same time as the continuous reception impossible time has elapsed since the switching to the real-time playback has been performed. Formed to output as possible,
The control means waits for a response to switch to the time shift reproduction in response to the inquiry about whether or not to switch to the time shift reproduction outputted by the inquiry output means, and switches to the time shift reproduction. 5. The mobile broadcast receiver according to claim 4, wherein the mobile broadcast receiver is configured to control the time-shift playback processing means and the real-time playback processing means.

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