JP2019216308A - Terrestrial digital television broadcast receiver, in-vehicle information device, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a terrestrial digital television broadcast receiving device capable of suppressing a sudden change in image quality when switching a displayed video between a full segment broadcast video and a one segment broadcast video. A video quality adjusting unit (5) adjusts the video quality of a full segment broadcast when the reception quality of a terrestrial digital television broadcast falls below a first quality while a video display unit (9) displays a video of a full segment broadcast. When the reception quality of the terrestrial digital television broadcast falls below the second quality, which is lower than the first quality, the video switching unit 7 sets the video displayed by the video display unit 9 to the one-segment broadcasting as one-segment broadcasting. Switch from full-segment broadcast video that is considered to be equivalent to broadcast video quality to one-segment broadcast video. [Selection diagram] Figure 1

Description

  The present invention relates to a terrestrial digital television broadcast receiving apparatus for receiving terrestrial digital television broadcasts.

  There are two modes of terrestrial digital television broadcasting: full segment broadcasting (hereinafter, referred to as "full segment") and one segment broadcasting (hereinafter, referred to as "one segment"). In terms of quality, Full Seg has higher image quality than One Seg. On the other hand, the receivable area is wider in One Seg than in Full Seg. Therefore, some terrestrial digital television broadcast receivers have a function of switching between full seg and one seg in accordance with the reception environment, such as the digital broadcast receiver of Patent Document 1.

JP 2009-278446 A

  However, since there is a difference in video quality between full seg and one seg, a sudden change in image quality gives the user a sense of discomfort when switching.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a terrestrial digital television capable of suppressing a sharp change in image quality when switching an image to be displayed between a full-segment image and a one-segment image. An object is to obtain a broadcast receiving device.

  A terrestrial digital television broadcast receiving apparatus according to the present invention adjusts a video switching unit that switches a video displayed by a video display unit between a full-segment broadcast video and a one-segment broadcast video, and a video quality of a full-segment broadcast. A video quality adjustment unit, wherein when the reception quality of the terrestrial digital television broadcast falls below the first quality while the video display unit is displaying the video of the full segment broadcast, the video quality adjustment unit includes: The video quality is equivalent to the video quality of the one-segment broadcast, and the video switching unit changes the video displayed by the video display unit to the video quality of the one-segment broadcast when the reception quality falls below the second quality lower than the first quality. It is characterized by switching from a full-segment broadcast video to a one-segment broadcast video.

  According to the present invention, when the displayed image is switched between the full-segment image and the one-segment image, a sudden change in image quality can be suppressed.

FIG. 2 is a diagram showing a configuration of a terrestrial digital television broadcast receiving apparatus according to Embodiment 1. 2A and 2B are diagrams illustrating an example of a hardware configuration of the terrestrial digital television broadcast receiver according to Embodiment 1. FIG. It is a figure for explaining an example about the details of processing of an image quality adjustment part, an audio quality adjustment part, an image switching part, and an audio switching part. FIG. 4 is a flowchart illustrating processing by a video quality adjustment unit and a video switching unit illustrated in FIG. 3. FIG. 4 is a flowchart illustrating a process performed by a voice quality adjustment unit and a voice switching unit illustrated in FIG. 3; FIG. 9 is a diagram showing a configuration of a terrestrial digital television broadcast receiving apparatus according to Embodiment 2.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a configuration of a terrestrial digital television broadcast receiving apparatus 1 according to Embodiment 1. The terrestrial digital television broadcast receiver 1 is provided in an in-vehicle information device such as a car navigation device, for example. Alternatively, the terrestrial digital television broadcast receiver 1 may be provided in a portable mobile terminal such as a mobile phone. The terrestrial digital television broadcast receiving apparatus 1 is an apparatus capable of receiving terrestrial digital television broadcasts including one seg and full seg.

  The terrestrial digital television broadcast receiver 1 includes a receiving unit 2, a one-segment decoder 3, a full-segment decoder 4, a video quality adjustment unit 5, an audio quality adjustment unit 6, a video switching unit 7, and an audio switching unit 8. The terrestrial digital television broadcast receiver 1 is electrically connected to the video display unit 9 and the audio output unit 10.

  The receiving unit 2 acquires a reception signal from an antenna (not shown) that has received a terrestrial digital television broadcast wave. The receiving unit 2 has a tuner unit 2a and a demodulation unit 2b. The tuner unit 2a extracts a signal corresponding to a broadcast station of a program selected by the user from a received signal acquired from an antenna (not shown), and outputs the signal to the demodulation unit 2b. The demodulation unit 2b demodulates the signal output from the tuner unit 2a, performs error correction processing and the like, and then outputs the demodulated signal to the one-segment decoder 3 and the full-segment decoder 4 as TS (Transport Stream) data.

  The one-segment decoder 3 performs a decoding process corresponding to a one-segment encoding format. The one-segment decoder 3 decodes the TS data output from the demodulation unit 2b, outputs one-segment video data to the video switching unit 7, and outputs one-segment audio data to the audio switching unit 8.

  The full-segment decoder 4 performs a decoding process corresponding to a full-segment encoding format. The full-segment decoder 4 decodes the TS data output from the demodulation unit 2b, outputs full-segment video data to the video quality adjustment unit 5, and outputs full-segment audio data to the audio quality adjustment unit 6.

  The video quality adjustment unit 5 performs a process for adjusting the quality of the video indicated by the video data on the video data output from the full-segment decoder 4. The video quality adjustment unit 5 outputs the processed video data to the video switching unit 7. The video data output by the full seg decoder 4 indicates a full seg video. The video quality adjustment unit 5 adjusts the video quality of the full-segment by performing, for example, a process of changing the resolution or a process of changing the bit rate.

  The audio quality adjustment unit 6 performs a process for adjusting the quality of the audio indicated by the audio data on the audio data output from the full-segment decoder 4. The audio quality adjustment unit 6 outputs the processed audio data to the audio switching unit 8. The audio data output by the full-segment decoder 4 indicates full-segment audio. The audio quality adjustment unit 6 adjusts the audio quality of the full segment by, for example, performing a process of changing a bit rate.

  The video switching unit 7 selectively outputs the one-segment video data output by the one-segment decoder 3 and the full-segment video data output by the video quality adjustment unit 5 to the video display unit 9. That is, the video switching unit 7 switches the video displayed by the video display unit 9 between the full-segment video and the one-segment video.

  The audio switching unit 8 selectively outputs to the audio output unit 10 the one-segment audio data output from the one-segment decoder 3 and the full-segment audio data output from the audio quality adjustment unit 6. That is, the audio switching unit 8 switches the audio output from the audio output unit 10 between full-segment audio and one-segment audio.

  Details of the processing of the video quality adjustment unit 5, the audio quality adjustment unit 6, the video switching unit 7, and the audio switching unit 8 will be described later with reference to FIG.

  The video display unit 9 displays a video indicated by the video data output by the video switching unit 7. The image display unit 9 is, for example, a liquid crystal display or an organic EL (Electro Luminescence) display.

  The audio output unit 10 outputs the audio indicated by the audio data output by the audio switching unit 8. The audio output unit 10 is, for example, a speaker or an earphone.

Next, an example of a hardware configuration of the terrestrial digital television broadcast receiver 1 will be described with reference to FIGS. 2A and 2B.
The functions of the receiving unit 2, the one-segment decoder 3, the full-segment decoder 4, the video quality adjustment unit 5, the audio quality adjustment unit 6, the video switching unit 7, and the audio switching unit 8 are realized by a processing circuit. The processing circuit may be dedicated hardware or a CPU (Central Processing Unit) that executes a program stored in a memory. The CPU is also called a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, a processor, or a DSP (Digital Signal Processor).

  FIG. 2A shows the functions of the receiving unit 2, one-segment decoder 3, full-segment decoder 4, video quality adjustment unit 5, audio quality adjustment unit 6, video switching unit 7, and audio switching unit 8 using dedicated hardware processing. FIG. 3 is a diagram illustrating an example of a hardware configuration realized by a circuit 101. The processing circuit 101 is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), or an FPGA (Field Programmable Gate Array), or a combination thereof. I do. Even if the functions of the receiving unit 2, the one-segment decoder 3, the full-segment decoder 4, the video quality adjustment unit 5, the audio quality adjustment unit 6, the video switching unit 7, and the audio switching unit 8 are realized by combining the separate processing circuits 101. Alternatively, the functions of the receiving unit 2, the one-segment decoder 3, the full-segment decoder 4, the video quality adjustment unit 5, the audio quality adjustment unit 6, the video switching unit 7, and the audio switching unit 8 are realized by one processing circuit 101. Is also good.

  FIG. 2B is a program stored in the memory 102 showing the functions of the receiving unit 2, the one-segment decoder 3, the full-segment decoder 4, the video quality adjustment unit 5, the audio quality adjustment unit 6, the video switching unit 7, and the audio switching unit 8. FIG. 3 is a diagram illustrating an example of a hardware configuration in a case where the hardware configuration is realized by a CPU 103 that executes the above. In this case, the functions of the receiving unit 2, the one-segment decoder 3, the full-segment decoder 4, the video quality adjustment unit 5, the audio quality adjustment unit 6, the video switching unit 7, and the audio switching unit 8 are software, firmware, or software and firmware. This is realized by a combination with Software and firmware are described as programs and stored in the memory 102. The CPU 103 reads out and executes the program stored in the memory 102 to thereby execute the receiving unit 2, the one-segment decoder 3, the full-segment decoder 4, the video quality adjustment unit 5, the audio quality adjustment unit 6, the video switching unit 7, and the audio switching unit. 8 realizes the function of each part. That is, the terrestrial digital television broadcast receiver 1 stores a program or the like that results in steps ST1 to ST9 and steps ST11 to ST19 shown in the flowcharts of FIGS. It has a memory 102. In addition, these programs execute the procedure or method of each unit of the receiving unit 2, the one-segment decoder 3, the full-segment decoder 4, the video quality adjustment unit 5, the audio quality adjustment unit 6, the video switching unit 7, and the audio switching unit 8 on a computer. It can also be said to be. Here, the memory 102 is, for example, a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable ROM), or an EEPROM (Electrically Erasable Programmable or volatile ROM such as a volatile nonvolatile ROM). A semiconductor memory or a disk-shaped recording medium such as a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versatile Disc) is applicable.

  Some of the functions of the receiving unit 2, the one-segment decoder 3, the full-segment decoder 4, the video quality adjustment unit 5, the audio quality adjustment unit 6, the video switching unit 7, and the audio switching unit 8 are partially realized by dedicated hardware. Alternatively, a part may be realized by software or firmware. For example, the functions of the reception unit 2, the one-segment decoder 3, and the full-segment decoder 4 are realized by a processing circuit as dedicated hardware, and the video quality adjustment unit 5, the audio quality adjustment unit 6, the video switching unit 7, and the audio switching unit With regard to 8, the function can be realized by the processing circuit reading and executing the program stored in the memory.

  As described above, the processing circuit is configured by the above-described receiving unit 2, one-segment decoder 3, full-segment decoder 4, video quality adjustment unit 5, audio quality adjustment unit 6, video switching unit 7 by hardware, software, firmware, or a combination thereof. In addition, the function of each unit of the audio switching unit 8 can be realized.

Next, an example of the processing of the video quality adjustment unit 5, the audio quality adjustment unit 6, the video switching unit 7, and the audio switching unit 8 will be described in detail with reference to FIG.
FIG. 3 shows the display mode of the video display unit 9, the output mode of the audio output unit 10, the video quality of the full seg after being processed by the video quality adjustment unit 5, and the video mode after being processed by the audio quality adjustment unit 6. It shows how the audio quality of Full Seg is related to the reception quality of digital terrestrial television broadcasting.
The reception quality of the terrestrial digital television broadcast is determined by, for example, the reception unit 2. The receiving unit 2 determines the reception quality using a C / N (Carrier to Noise) ratio or a BER (Bit Error Rate). The receiving unit 2 outputs the determined reception quality to the video quality adjustment unit 5, the audio quality adjustment unit 6, the video switching unit 7, and the audio switching unit 8.

  It is assumed that the display mode of the video display unit 9 and the output mode of the audio output unit 10 are full segment, and the user is provided with full segment video and full segment audio. That is, the video switching unit 7 outputs the full-segment video data output by the video quality adjustment unit 5 to the video display unit 9, and the audio switching unit 8 outputs the full-segment audio data output by the audio quality adjustment unit 6 as audio output. Output to the unit 10. At this time, if the reception quality of the terrestrial digital television broadcast is higher than the seventh quality, the video quality adjustment unit 5 does not perform the process of adjusting the video quality of the full segment, and the audio quality adjustment unit 6 adjusts the audio quality of the full segment. No adjustment process is performed. That is, the image displayed by the image display unit 9 is a full-segment image and has the original image quality of the full-segment image. Similarly, the sound output from the sound output unit 10 is a full-segment sound, which is the original sound quality of the full-segment sound.

  Then, when the reception quality of the terrestrial digital TV broadcast decreases and falls below the seventh quality, the video quality adjustment unit 5 performs a process of adjusting the video quality of the full segment, and the audio quality adjustment unit 6 performs the process of adjusting the audio quality of the full segment. Is adjusted. Specifically, the video quality adjustment unit 5 adjusts the video quality of full seg according to the reception quality of terrestrial digital television broadcasting, and lowers the video quality of full seg as the reception quality of terrestrial digital television broadcasting is lower. Further, the audio quality adjustment unit 6 adjusts the audio quality of the full seg according to the reception quality of the terrestrial digital television broadcast, and lowers the audio quality of the full seg as the reception quality of the terrestrial digital television broadcast is lower.

Then, when the reception quality of the terrestrial digital television broadcast falls below the third quality lower than the seventh quality, the audio quality adjustment unit 6 adjusts the full-segment audio quality to the one-segment audio quality.
When the reception quality of the terrestrial digital television broadcast falls below the first quality lower than the third quality, the video quality adjustment unit 5 adjusts the full-segment video quality to the one-segment video quality.
In FIG. 3, the first quality is set as lower than the third quality, but the first quality is set as the same as or higher than the third quality. Is also good.

  Then, when the reception quality of the terrestrial digital television broadcast falls below the fourth quality lower than the third quality, the audio switching unit 8 outputs to the audio output unit 10 the full-segment output from the audio quality adjustment unit 6. The audio data is switched to the one-segment audio data output by the one-segment decoder 3. That is, the audio switching unit 8 switches the audio output from the audio output unit 10 from full-segment audio that is equivalent to one-segment audio quality to one-segment audio. Thus, the voice heard by the user is switched while maintaining the continuity of the quality. Since the sound quality is the same before and after switching from full-segment sound to one-segment sound, it is possible to suppress a rapid change in the sound quality recognized by the user. Therefore, the user does not feel uncomfortable.

When the reception quality of the terrestrial digital television broadcast falls below the second quality lower than the first quality, the video switching unit 7 outputs the output to the video display unit 9 of the full segment output from the video quality adjustment unit 5. The video data is switched to the one-segment video data output by the one-segment decoder 3. That is, the video switching unit 7 switches the video displayed by the video display unit 9 from a full-seg video equivalent to one-seg video quality to a one-seg video. In this way, the video viewed by the user switches while maintaining the continuity of quality. Since the image quality is the same before and after switching from the full-segment video to the one-segment video, a sharp change in the image quality recognized by the user can be suppressed. Therefore, the user does not feel uncomfortable.
In FIG. 3, the second quality is set as lower than the fourth quality, but the second quality is set as the same as or higher than the fourth quality. Is also good. If the second quality and the fourth quality are different from each other, the timing at which the video is switched and the timing at which the audio is switched are deviated, and the user's uncomfortable feeling can be reduced as compared with the case where both timings are the same.

  When the one-segment video data output by the one-segment decoder 3 is being output by the video switching unit 7 to the video display unit 9, the video quality adjustment unit 5 adjusts the full-segment video quality to the one-segment video quality, and The video data is output to the video switching unit 7. When the one-segment audio data output from the one-segment decoder 3 is output from the audio switching unit 8 to the audio output unit 10, the audio quality adjustment unit 6 adjusts the full-segment audio quality to the one-segment audio quality. Full segment audio data is output to the audio switching unit 8.

Then, when the reception quality of the terrestrial digital television broadcast exceeds the fifth quality, the video switching unit 7 outputs to the video display unit 9 by the video quality adjustment unit 5 from the one-segment video data output by the one-segment decoder 3. Switch to the output full-segment video data. That is, the video switching unit 7 switches the video displayed by the video display unit 9 from a one-segment video to a full-segment video equivalent to the one-segment video quality. In this way, the video viewed by the user switches while maintaining the continuity of quality. Since the video quality is the same before and after switching from the one-segment video to the full-segment video, a sharp change in the image quality recognized by the user can be suppressed. Therefore, the user does not feel uncomfortable.
After the video displayed by the video display unit 9 is switched to the full-segment video, the video quality adjustment unit 5 adjusts the full-segment video quality to a quality corresponding to the reception quality of the terrestrial digital television broadcast as shown in FIG. . If the reception quality of the terrestrial digital television broadcast is improved, the full-segment video displayed by the video display unit 9 is also improved to the original full-segment video quality.
In FIG. 3, the fifth quality is set as the same as the second quality. However, the fifth quality may be set as different from the second quality to prevent chattering. Good. The eighth quality in FIG. 3 indicates the reception limit of full segment.

Then, when the reception quality of the terrestrial digital television broadcast exceeds the sixth quality, the audio switching unit 8 outputs the signal to the audio output unit 10 from the one-segment audio data output from the one-segment decoder 3 by the audio quality adjustment unit 6. Switch to the output full-segment audio data. That is, the audio switching unit 8 switches the audio output from the audio output unit 10 from one-segment audio to full-segment audio equivalent to one-segment audio quality. Thus, the voice heard by the user is switched while maintaining the continuity of the quality. Since the sound quality is the same before and after switching from the one-segment sound to the full-segment sound, a sudden change in the sound quality recognized by the user can be suppressed. Therefore, the user does not feel uncomfortable.
After the audio output from the audio output unit 10 is switched to the full-segment audio, the audio quality adjustment unit 6 adjusts the full-segment audio quality to a quality corresponding to the reception quality of the terrestrial digital television broadcast as shown in FIG. . If the reception quality of the terrestrial digital television broadcast is improved, the full-segment audio output from the audio output unit 10 is also improved to the original full-segment audio quality.
In FIG. 3, the sixth quality is set as the same as the fourth quality, but the sixth quality may be set as different from the fourth quality in order to prevent chattering. Good. Also, in FIG. 3, the fifth quality is set as lower than the sixth quality, but the fifth quality is set as the same as or higher than the sixth quality. Is also good. If the fifth quality and the sixth quality are different from each other, the timing of switching the video and the timing of switching the audio are shifted, and the user's discomfort can be reduced as compared with the case where both timings are the same.

FIG. 4 is a flowchart showing the processing by the video quality adjustment unit 5 and the video switching unit 7 shown in FIG. The flowchart shown in FIG. 4 is repeatedly performed periodically.
The video quality adjustment unit 5 determines whether a full-segment video is displayed on the video display unit 9 (step ST1). For the determination in step ST1, the video switching unit 7 determines which of the video data from the one-segment decoder 3 and the video data from the video quality adjustment unit 5 is being output to the video display unit 9 to the video quality adjustment unit 5. Notice.

When the full-segment video is displayed on the video display unit 9 (step ST1; YES), the video quality adjustment unit 5 determines whether the reception quality of the terrestrial digital television broadcast is lower than the first quality (step ST2). .
If the reception quality of the terrestrial digital television broadcast is not lower than the first quality (step ST2; NO), the video quality adjustment unit 5 changes the full-segment video quality to the reception quality of the terrestrial digital television broadcast as shown in FIG. A process for adjusting to the corresponding quality is performed (step ST3). At this time, the full-segment video is adjusted to a higher quality than at least the one-segment video quality.

On the other hand, when the reception quality of the terrestrial digital television broadcast is lower than the first quality (step ST2; YES), the video quality adjustment unit 5 adjusts the full-segment video quality to the one-segment video quality (step ST4).
Subsequently, the video switching unit 7 determines whether the reception quality of the digital terrestrial television broadcast is lower than the second quality (step ST5).
If the reception quality of the terrestrial digital television broadcast is not lower than the second quality (step ST5; NO), the process ends.
On the other hand, when the reception quality of the terrestrial digital television broadcast is lower than the second quality (step ST5; YES), the video switching unit 7 switches the output to the video display unit 9 to display the video displayed by the video display unit 9. One-segment video is set (step ST6).

When the one-segment video is displayed on the video display unit 9 (step ST1; NO), the video quality adjustment unit 5 adjusts the full-segment video quality to the one-segment video quality (step ST7).
Subsequently, the video switching unit 7 determines whether the reception quality of the terrestrial digital television broadcast exceeds the fifth quality (step ST8).
If the reception quality of the terrestrial digital television broadcast is not higher than the fifth quality (step ST8; NO), the process ends.
On the other hand, when the reception quality of the terrestrial digital television broadcast exceeds the fifth quality (step ST8; YES), the video switching unit 7 switches the output to the video display unit 9 to display the video displayed by the video display unit 9. A full segment video is set (step ST9).

FIG. 5 shows, as a flowchart, the processing by the audio quality adjustment unit 6 and the audio switching unit 8 shown in FIG. The flowchart shown in FIG. 5 is repeatedly performed periodically.
The audio quality adjustment unit 6 determines whether the full-segment audio is output from the audio output unit 10 (step ST11). For the determination in step ST11, the audio switching unit 8 determines which of the audio data from the one-segment decoder 3 and the audio data from the audio quality adjustment unit 6 is being output to the audio output unit 10 by sending to the audio quality adjustment unit 6. Notice.

If full-segment audio is being output from the audio output unit 10 (step ST11; YES), the audio quality adjustment unit 6 determines whether the reception quality of the terrestrial digital television broadcast is lower than the third quality (step ST12). .
If the reception quality of the terrestrial digital television broadcast is not lower than the third quality (step ST12; NO), the audio quality adjustment unit 6 changes the full-segment audio quality to the reception quality of the terrestrial digital television broadcast as shown in FIG. A process for adjusting to the corresponding quality is performed (step ST13). At this time, the voice of the full segment is adjusted to a higher quality than at least the voice quality of the one segment.

On the other hand, if the reception quality of the terrestrial digital television broadcast is lower than the third quality (step ST12; YES), the audio quality adjustment unit 6 adjusts the full-segment audio quality to one-segment audio quality (step ST14).
Subsequently, the audio switching unit 8 determines whether the reception quality of the terrestrial digital television broadcast is lower than the fourth quality (step ST15).
If the reception quality of the terrestrial digital television broadcast is not lower than the fourth quality (step ST15; NO), the process ends.
On the other hand, when the reception quality of the terrestrial digital television broadcast is lower than the fourth quality (step ST15; YES), the audio switching unit 8 switches the output to the audio output unit 10 and outputs the audio output from the audio output unit 10. A one-segment voice is set (step ST16).

When the one-segment audio is output from the audio output unit 10 (step ST11; NO), the audio quality adjustment unit 6 adjusts the full-segment audio quality to be equivalent to the one-segment audio quality (step ST17).
Subsequently, the audio switching unit 8 determines whether the reception quality of the digital terrestrial television broadcast exceeds the sixth quality (step ST18).
If the reception quality of the terrestrial digital television broadcast is not higher than the sixth quality (step ST18; NO), the process ends.
On the other hand, when the reception quality of the terrestrial digital television broadcast exceeds the sixth quality (step ST18; YES), the audio switching unit 8 switches the output to the audio output unit 10 and outputs the audio output from the audio output unit 10. A full-segment voice is set (step ST19).

  In the above description, a case has been described in which not only the video quality of Full Seg but also the audio quality of Full Seg is adjusted. However, the terrestrial digital television broadcast receiver 1 does not need to adjust the audio quality of the full segment. That is, the terrestrial digital television broadcast receiver 1 does not need to include the audio quality adjustment unit 6. The difference in video quality between full seg and one seg is large enough to give the user a strong sense of discomfort, but the difference in audio quality between full seg and one seg is not so large.

As described above, according to the first embodiment, when the video displayed by the video display unit 9 is switched from the full-segment video to the one-segment video by the video switching unit 7, the video quality of the full-segment is adjusted by the video quality adjustment unit 5. It is equivalent to the video quality of 1Seg. Therefore, when switching from the full-segment video to the one-segment video, a sudden change in the image quality can be suppressed, so that the user does not feel uncomfortable.
When the video displayed by the video display unit 9 is switched from the one-segment video to the full-segment video by the video switching unit 7, the video quality of the full-segment is equivalent to the one-segment video quality by the video quality adjustment unit 5. Therefore, when switching from one-segment video to full-segment video, it is possible to suppress a sudden change in image quality and prevent the user from feeling uncomfortable.

  In addition, the terrestrial digital television broadcast receiver 1 includes an audio switching unit 8 that switches the audio output from the audio output unit 10 between full-segment audio and one-segment audio, and an audio quality adjustment unit 6 that adjusts the audio quality of full-segment audio. If the reception quality of the terrestrial digital television broadcast falls below the third quality while the audio output unit 10 is outputting full-segment audio, the audio quality adjustment unit 6 changes the full-segment audio quality to one-segment audio. When the reception quality of the terrestrial digital television broadcast falls below the fourth quality lower than the third quality, the audio switching unit 8 determines that the audio output from the audio output unit 10 is equivalent to the one-segment audio quality. Switch from full-segment audio to one-segment audio. Therefore, it is possible to suppress a sudden change in sound quality when switching sounds, and to prevent the user from feeling uncomfortable.

  In addition, the terrestrial digital television broadcast receiver 1 includes an audio switching unit 8 that switches the audio output from the audio output unit 10 between full-segment audio and one-segment audio, and an audio quality adjustment unit 6 that adjusts the audio quality of full-segment audio. The audio quality adjustment unit 6 sets the full-segment audio quality to the one-segment audio quality when the audio output unit 10 outputs the one-segment audio, and the audio switching unit 8 receives the terrestrial digital television broadcast. When the quality exceeds the sixth quality, the audio output unit 10 switches the audio output from the one-segment audio to the full-segment audio equivalent to the one-segment audio quality. Therefore, it is possible to suppress a sudden change in sound quality when switching sounds, and to prevent the user from feeling uncomfortable.

  Further, the second quality and the fourth quality are different from each other. The difference between the timing of switching the video and the timing of switching the audio makes it possible to reduce the sense of discomfort given to the user as compared with the case where both timings are the same.

  Further, the fifth quality and the sixth quality are different from each other. The difference between the timing of switching the video and the timing of switching the audio makes it possible to reduce the sense of discomfort given to the user as compared with the case where both timings are the same.

Embodiment 2. FIG.
In the second embodiment, a description will be given of a mode in which the time difference between full seg and one seg can be eliminated to further suppress the user's discomfort when switching.
FIG. 6 is a diagram showing a configuration of a terrestrial digital television broadcast receiving apparatus 1A according to the second embodiment. The terrestrial digital television broadcast receiver 1A is different from the terrestrial digital television broadcast receiver 1 in having an audio comparing unit 11, a first delay unit 12, and a second delay unit 13. The first delay unit 12 and the second delay unit 13 form a delay unit. Components having the same or equivalent functions as those already described in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted or simplified. The audio comparing unit 11, the first delay unit 12, and the second delay unit 13 are, for example, the processing circuit 101 illustrated in FIG. 2A or the CPU 103 that executes a program stored in the memory 102 illustrated in FIG. 2B. Is achieved.

The audio comparing unit 11 detects a time difference between the full seg and the one seg using the one seg audio data acquired from the one seg decoder 3 and the full seg audio data acquired from the full seg decoder 4. Due to the difference in the encoding format and the like, a time difference occurs between the full seg and the one seg. The audio comparing unit 11 detects a time difference between full seg and one seg by comparing, for example, frequency characteristics and the like.
The audio comparing unit 11 notifies the first delay unit 12 and the second delay unit 13 which of the full seg and the one seg is advanced or delayed.

The first delay unit 12 adjusts the output timing of the one-segment video data output from the one-segment decoder 3 to the video switching unit 7.
The second delay unit 13 adjusts the output timing of the full-segment video data output from the full-segment decoder 4 to the video quality adjustment unit 5.
The first delay unit 12 and the second delay unit 13 receive the notification from the audio comparison unit 11, and send the one-segment video indicated by the one-segment video data input to the video switching unit 7 to the video switching unit 7. The output timing of the video data is adjusted so that the time difference between the input full-seg video data and the full-seg video is eliminated.
By doing so, when the image displayed by the image display unit 9 is switched between the full-segment image and the one-segment image, the images are continuously connected without the occurrence of the image break before and after the switching. Therefore, the user does not feel uncomfortable.

The first delay unit 12 and the second delay unit 13 may perform the above-described processing on video data on audio data.
That is, the first delay unit 12 adjusts the output timing of the one-segment audio data output from the one-segment decoder 3 to the audio switching unit 8.
The second delay unit 13 adjusts the output timing of the full-segment audio data output from the full-segment decoder 4 to the audio quality adjustment unit 6.
The first delay unit 12 and the second delay unit 13 receive the notification from the audio comparison unit 11, and send the one-segment audio indicated by the one-segment audio data input to the audio switching unit 8 to the audio switching unit 8. The output timing of the audio data is adjusted so that the time difference between the input full-segment audio data and the full-segment audio data is eliminated.
In this way, when the sound output from the sound output unit 10 switches between the full-segment sound and the one-segment sound, the sound is continuously connected without skipping before and after the switching. Therefore, the user does not feel uncomfortable.

  As described above, according to the second embodiment, the time difference between the full-segment video and the one-segment video by the first delay unit 12 and the second delay unit 13 or the time difference between the full-segment audio and the one-segment audio is determined. The time difference is eliminated. Therefore, the discomfort experienced by the user at the time of switching can be further suppressed as compared with the case of the first embodiment.

  In addition, within the scope of the present invention, it is possible to freely combine any of the embodiments, modify any of the constituent elements of each of the embodiments, or omit any of the constituent elements of each of the embodiments. is there.

  1, 1A digital terrestrial television broadcasting receiver, 2 receiver, 2a tuner, 2b demodulator, 3seg decoder, 4seg decoder, 5 video quality adjustment unit, 6 audio quality adjustment unit, 7 video switching unit, 8 audio switching Unit, 9 video display unit, 10 audio output unit, 11 audio comparison unit, 12 first delay unit, 13 second delay unit, 101 processing circuit, 102 memory, 103 CPU.

Claims (9)

A video switching unit that switches the video displayed by the video display unit between a full-segment broadcast video and a one-segment broadcast video,
A video quality adjustment unit that adjusts the video quality of full segment broadcasting,
The video quality adjustment unit is configured to, when the video display unit is displaying a full-segment broadcast video and the reception quality of the terrestrial digital television broadcast falls below the first quality, change the video quality of the full-segment broadcast to a one-segment broadcast. Video quality equivalent to
When the reception quality falls below a second quality lower than the first quality, the video switching unit converts the video displayed by the video display unit to a full-segment broadcast video equivalent to one-segment broadcast video quality. Terrestrial digital television broadcast receiver characterized by switching from one to a one-segment broadcast video. An audio switching unit that switches audio output by the audio output unit between audio of full-segment broadcasting and audio of one-segment broadcasting,
An audio quality adjustment unit that adjusts the audio quality of the full segment broadcast,
The audio quality adjustment unit, if the reception quality is lower than the third quality while the audio output unit is outputting the audio of the full segment broadcast, the audio quality of the full segment broadcast is equivalent to the audio quality of the one segment broadcast. age,
When the reception quality falls below a fourth quality lower than the third quality, the audio switching unit converts the audio output by the audio output unit into a full-segment broadcast audio equivalent to the one-segment broadcast audio quality. 2. The terrestrial digital television broadcast receiving apparatus according to claim 1, wherein the digital terrestrial television broadcast receiving apparatus is switched to one-segment broadcast audio. A video switching unit that switches the video displayed by the video display unit between a full-segment broadcast video and a one-segment broadcast video,
A video quality adjustment unit that adjusts the video quality of full segment broadcasting,
The video quality adjustment unit, when the video display unit is displaying a video of a one-segment broadcast, the video quality of the full-segment broadcast is equivalent to the video quality of the one-segment broadcast,
When the reception quality of the terrestrial digital television broadcast exceeds the fifth quality, the video switching unit switches the video displayed by the video display unit from a one-segment broadcast video to a full-segment equivalent to the one-segment broadcast video quality. A terrestrial digital television broadcast receiver characterized by switching to broadcast video. An audio switching unit that switches audio output by the audio output unit between audio of full-segment broadcasting and audio of one-segment broadcasting,
An audio quality adjustment unit that adjusts the audio quality of the full segment broadcast,
The audio quality adjustment unit, when the audio output unit is outputting the audio of the one-segment broadcast, the audio quality of the full segment broadcast is equivalent to the audio quality of the one-segment broadcast,
When the reception quality exceeds the sixth quality, the audio switching unit changes the audio output from the audio output unit from one-segment broadcast audio to full-segment broadcast audio equivalent to the one-segment broadcast audio quality. The terrestrial digital television broadcast receiving apparatus according to claim 3, wherein the apparatus is switched.   3. The terrestrial digital television broadcast receiving apparatus according to claim 2, wherein the second quality and the fourth quality are different from each other.   The terrestrial digital television broadcast receiver according to claim 4, wherein the fifth quality and the sixth quality are different from each other.   7. A delay unit for eliminating a time difference between a full-segment broadcast video and a one-segment broadcast video or a time difference between a full-segment broadcast audio and a one-segment broadcast audio. The terrestrial digital television broadcast receiving apparatus according to any one of the above.   An in-vehicle information device comprising the terrestrial digital television broadcast receiving device according to any one of claims 1 to 7.   A program for causing a computer to function as the terrestrial digital television broadcast receiver according to any one of claims 1 to 7.

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