WO2010026692A1 - Récepteur numérique - Google Patents

Récepteur numérique Download PDF

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Publication number
WO2010026692A1
WO2010026692A1 PCT/JP2009/003241 JP2009003241W WO2010026692A1 WO 2010026692 A1 WO2010026692 A1 WO 2010026692A1 JP 2009003241 W JP2009003241 W JP 2009003241W WO 2010026692 A1 WO2010026692 A1 WO 2010026692A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
end unit
reception
digital
digital receiver
Prior art date
Application number
PCT/JP2009/003241
Other languages
English (en)
Japanese (ja)
Inventor
東垣昌和
中川幸彦
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2010527659A priority Critical patent/JPWO2010026692A1/ja
Publication of WO2010026692A1 publication Critical patent/WO2010026692A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/08—Constructional details, e.g. cabinet
    • H04B1/082—Constructional details, e.g. cabinet to be used in vehicles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
    • H04H60/11—Arrangements for counter-measures when a portion of broadcast information is unavailable
    • H04H60/12—Arrangements for counter-measures when a portion of broadcast information is unavailable wherein another information is substituted for the portion of broadcast information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/439—Processing of audio elementary streams
    • H04N21/4394—Processing of audio elementary streams involving operations for analysing the audio stream, e.g. detecting features or characteristics in audio streams

Definitions

  • the present invention relates to a digital receiver that receives digital broadcasting.
  • the user may mistakenly assume that the volume is adjusted to the minimum volume, and the user may operate the volume at a high volume.
  • the reception state is restored, a loud sound is suddenly output.
  • Such a situation may frequently occur in a vehicle-mounted digital receiver whose reception state varies depending on the travel location of the vehicle, which is not preferable in terms of safety.
  • the present invention has been made to solve the above-described problems. According to the user's preference, the digital broadcast cannot be received due to the deterioration of the reception state without causing discomfort to the user. It is an object of the present invention to provide a digital receiver capable of transmitting information in a form that can be transmitted and that prevents erroneous operation of volume adjustment when reception is impossible.
  • a digital receiver includes a front-end unit that receives and demodulates a digital broadcast, and a back-end unit that decodes a signal demodulated by the front-end unit and reproduces broadcast contents. And determining the reception state of the digital broadcast by the front-end unit when the music data is received, and selecting from the storage unit when the broadcast content cannot be reproduced due to the deterioration of the reception state And a determination unit that causes the back-end unit to reproduce the music data as BGM.
  • the reception state of the digital broadcast by the front end unit is determined, and when the reception content cannot be reproduced due to the deterioration of the reception state, the music data selected from the storage unit is set as BGM as the back end unit. Therefore, there is an effect that the fact that the digital broadcast cannot be received due to the deterioration of the reception state can be transmitted in a form according to the user's preference without giving the user unpleasant feeling.
  • FIG. 6 is a flowchart showing another operation flow of the digital receiver according to the first embodiment.
  • 6 is a flowchart illustrating another operation flow of the digital receiver according to the first embodiment.
  • FIG. 1 is a diagram showing a configuration of a digital receiver according to Embodiment 1 of the present invention, and shows a case where the present invention is applied to a digital television broadcast receiver.
  • a digital receiver 1 according to Embodiment 1 includes an antenna 2, a front end unit 3, a back end unit 4, an audio signal processing unit 5, an amplifier (AMP) 6, a monitor 7, a speaker (SP) 8, and a microcomputer.
  • the front end unit 3 includes a tuner 11 and an OFDM demodulation unit 12.
  • the tuner 11 extracts a modulation signal necessary for reproduction of broadcast contents from a digital television broadcast (radio wave) reception signal received by the antenna 2.
  • the OFDM demodulator 12 receives the modulated signal extracted by the tuner 11 and demodulates it by OFDM (Orthogonal Frequency Division Multiplexing), thereby obtaining a TS (Transport Stream) signal.
  • the back-end unit 4 is a component that decodes the TS signal obtained by the OFDM demodulating unit 12 and reproduces an audio signal and a video signal of digital television broadcast contents.
  • the TS decoder 13, the audio decoder 14, and the video decoder A display processing unit 15 is provided.
  • the TS decoder 13 separates the TS signal input from the OFDM demodulator 12 into elementary streams (ES) such as audio and video.
  • the audio decoder 14 decodes an audio elementary stream and converts it into an audio signal.
  • the video decoder display processing unit 15 decodes a video elementary stream and converts it into a video signal.
  • the TS decoder 13, the audio decoder 14, and the video decoder display processing unit 15 may be realized by a dedicated hardware circuit, but may be realized by software executed by a CPU of a microcomputer.
  • a data broadcast stream is also extracted from the TS decoder 13. The data broadcast stream is transferred to and stored in the internal memory of the digital receiver 1 and then executed by the CPU.
  • the audio signal processing unit 5 is a component that performs processing for changing the acoustic characteristics (acoustic parameters) such as volume and sound quality on the audio signal input from the audio decoder 14, and is, for example, a digital signal processor (DSP: Digital). Signal Processor) and electronic volume.
  • DSP digital signal processor
  • the audio signal output from the audio signal processing unit 5 is amplified by an amplifier (AMP) 6 and output from the speaker 8.
  • AMP amplifier
  • the video signal output from the video decoder display processing unit 15 is output to the monitor 7 and displayed on the screen of the monitor 7.
  • the microcomputer unit 9 is a component that performs control of the output volume of an audio signal (hereinafter referred to as VOL control), operation control of the back-end unit 4, and the like, and includes a PER confirmation unit 16, a back-end I / F 17, and VOL control.
  • the PER confirmation unit 16 the back-end I / F 17, the VOL control unit 18, the external VOL operation I / F 19 and the setting information acquisition unit 20, for example, control programs that represent the functions of these components by program modules.
  • control programs that represent the functions of these components by program modules.
  • the PER confirmation unit 16 determines the reception state of the digital television broadcast based on the packet error rate (Packet Error Rate) (hereinafter referred to as PER) after the OFDM demodulation taken in from the OFDM demodulation unit 12, and the back end unit 4 It is a component that performs operation control, and includes a PER storage unit 22 and a determination unit 23.
  • Packet Error Rate Packet Error Rate
  • the PER storage unit 22 is a memory that stores the PER captured by the PER confirmation unit 16 from the OFDM demodulation unit 12.
  • the determination unit 23 determines the reception state of the digital television broadcast by the front end unit 3 based on the PER stored in the PER storage unit 22, and performs operation control of the back end unit 4 according to the reception state. Details of processing by the determination unit 23 will be described later.
  • the back end I / F 17 is an interface between the microcomputer unit 9 and the back end unit 4, and the control of the back end unit 4 by the microcomputer unit 9 is performed via the back end I / F 17.
  • the VOL control unit 18 inputs the volume set using the external VOL operation unit 25 via the external VOL operation I / F 19 and controls the audio signal processing unit 5 to output the audio signal at this volume ( VOL control).
  • the external VOL operation I / F 19 is an interface between the microcomputer unit 9 and the external VOL operation unit 25.
  • the external VOL operation I / F 19 takes in the volume set by the volume adjustment operation (hereinafter referred to as VOL operation) using the external VOL operation unit 25, Output to the VOL control unit 18.
  • the setting information acquisition unit 20 is a component that displays a menu screen or the like on the monitor 7 and provides a GUI (Graphical User Interface) that accepts information settings using the external operation unit 10, and performs an external operation based on the menu screen.
  • Information used in the process when reception is impossible set using the unit 10 is taken in and stored in the setting information memory 24. This information includes information for specifying music data to be played back as BGM when reception is impossible, error-free time for confirming whether the reception state is stable (hereinafter referred to as stable time), and the like.
  • the external operation unit 10 is a component for operating from the outside of the digital receiver 1, and the user sets desired information according to the external VOL operation unit 25 that accepts an external VOL operation and the menu screen.
  • An operation button 26 for operation is provided.
  • the memory 27 is a memory for storing music data to be reproduced as BGM when reception is impossible, and is constructed in, for example, an internal memory of the digital receiver 1 or an external memory that can be connected by a USB (Universal Serial Bus) or the like.
  • FIG. 2 is a flowchart showing the operation flow of the digital receiver according to the first embodiment, and mainly shows the operation by the microcomputer unit 9.
  • the setting information acquisition unit 20 displays a music selection column listing music data stored in the memory 27 and a time setting column for selecting or inputting a stable time as a menu screen, and an external operation unit based on this menu screen 10, the information specified using 10 (information specifying the music data for BGM and the stable time) is taken in and stored in the setting information memory 24.
  • the PER confirmation unit 16 of the microcomputer unit 9 takes in PER data obtained by error correction processing by OFDM demodulation from the OFDM demodulation unit 12 and stores it in the PER storage unit 22 (step ST2). ).
  • the determination unit 23 of the PER confirmation unit 16 reads the PER data stored in the PER storage unit 22 and compares it with a predetermined threshold value related to PER, and determines whether or not it is a receivable reception state from the comparison result ( Step ST3). For example, the PER value at which the screen freezes is set in the determination unit 23 in advance as the threshold value.
  • the threshold value is set. If it exceeds, it is determined that the broadcast content cannot be reproduced and is in an unreceivable state.
  • the determination unit 23 reads information specifying the music data selected by the user in step ST1 from the setting information memory 24, and causes the back end unit 4 to be read via the back end I / F 17.
  • the music data specified by the information is read out from the memory 27 (step ST4).
  • the back-end unit 4 reproduces the music data read from the memory 27 as BGM when reception is impossible (step ST5).
  • the PER confirmation unit 16 continues to acquire the PER data from the OFDM demodulation unit 12 even after the above-described BGM reproduction processing.
  • step ST3 the determination unit 23 monitors the state of the reproduction operation by the back end unit 4 via the back end I / F 17, and whether or not the BGM is being reproduced when reception is impossible. Is confirmed (step ST6).
  • the determination unit 23 reads the stable time selected by the user in step ST1 from the setting information memory 24, sets this in the timer 21, starts counting, and the stable time The process shifts to a waiting state until the time elapses (step ST7).
  • the PER confirmation unit 16 takes in the PER data from the OFDM demodulation unit 12 and stores it in the PER storage unit 22 (step ST8).
  • the determination unit 23 reads the PER data captured during the waiting state from the PER storage unit 22, and determines whether or not the reception state is a receivable in the same manner as in step ST3 ( Step ST9). At this time, if reception is possible, the determination unit 23 controls the back end unit 4 via the back end I / F 17 to stop the BGM reproduction (step ST10). Thereafter, the digital receiver 1 resumes reception of the digital television broadcast (step ST11).
  • step ST11 If the reception of the digital television broadcast is resumed (television audio output) in step ST11 or is still unreceivable in step ST9, the PER confirmation unit 16 returns to the process of step ST2 and returns from the OFDM demodulation unit 12. The PER data fetching is continued, and the processing of each step described above is repeated.
  • FIG. 3 is a diagram for explaining an outline of the operation of the determination unit in FIG. 1, and shows a reception state of digital TV broadcast and a determination result of reception availability as time elapses. If the change in the radio wave state of the digital television broadcast is expressed by an electric field, the determination unit 23 can receive the digital television broadcast by the front end unit 3 if the electric field threshold value exceeds the threshold value of the PER data described above. It is determined that the BGM playback should be stopped (determination A).
  • the electric field may fluctuate near the threshold as shown in FIG. For example, it is determined immediately when the electric field exceeds a threshold value (return time) from the state in which the processing based on the determination that the BGM should be reproduced (determination B) is in a reception state in which digital television broadcasting cannot be received If the process is switched to the process A and the electric field returns below the threshold immediately after this, the process must be switched to the process of the determination B again.
  • a threshold value return time
  • the digital receiver when the electric field exceeds the threshold value (recovery) in the state where the process of determination B is performed, a predetermined stable time has elapsed since the time when the electric field exceeded the threshold value (recovery time point). , The frequent switching between determination A (reception of digital television broadcast) and determination B (BGM playback) is prevented.
  • an upper limit value when reception is impossible is set for the volume change amount in the VOL operation, and a VOL operation exceeding the upper limit value may not be accepted when reception is impossible.
  • the determination unit 23 of the microcomputer unit 9 sets the upper limit value of the volume change amount when reception is impossible in the VOL control unit 18, and the VOL control unit 18 performs a VOL operation exceeding the upper limit value when reception is impossible. Not accepted.
  • the upper limit value of the volume change amount when reception is impossible may be set in advance, and the setting information acquisition unit 20 acquires and uses the value selected and specified by the user. Also good.
  • FIG. 4 is a flowchart showing another operation flow of the digital receiver according to the first embodiment, and shows an operation of accepting a VOL operation within the upper limit value range of the volume change amount when reception is impossible.
  • the determination unit 23 monitors the presence or absence of a VOL operation using the external VOL operation unit 25 via the external VOL operation I / F 19.
  • the PER confirmation unit 16 takes in the PER data obtained by error correction processing in OFDM demodulation from the OFDM demodulation unit 12 and stores it in the PER storage unit 22 (step ST1a).
  • ST2a the determination unit 23 monitors the presence or absence of a VOL operation using the external VOL operation unit 25 via the external VOL operation I / F 19.
  • the determination unit 23 reads the PER data stored in the PER storage unit 22, compares it with a predetermined threshold related to PER as in the case of FIG. 2, and determines whether or not it is in a receivable state from this comparison result ( Step ST3a).
  • the VOL control unit 18 clears the volume change amount upper limit value when reception is impossible (step ST4a). ). Thereby, the VOL control part 18 receives the VOL operation within the normal volume control range including the maximum volume (step ST5a).
  • step ST6a the determination unit 23 confirms whether or not the upper limit value of the volume change amount has been set in the VOL control unit 18 (step ST6a). At this time, if the upper limit value of the volume change amount is not set, the determination unit 23 sets the upper limit value in the VOL control unit 18 (step ST7a).
  • the VOL control unit 18 accepts a VOL operation within a range that does not exceed the set upper limit value (steps ST8a and ST5a). By doing so, it is possible to prevent an erroneous operation of adjusting the volume to a high volume when reception is impossible, and a sudden volume change (change from silence to high volume) does not occur when reception is possible.
  • the upper limit value of the volume change amount is set.
  • the lower limit value of the volume change amount may be set in order to prevent erroneous operation in a silent state when reception is impossible. .
  • an upper limit value and a lower limit value may be set at the same time, and only a VOL operation within a range defined by these may be accepted.
  • FIG. 5 is a flowchart showing another operation flow of the digital receiver according to the first embodiment, and shows an operation of not accepting a VOL operation when reception is impossible.
  • the process from step ST1b to step ST3b is the same as that of FIG.
  • the VOL control unit 18 receives a VOL operation within a normal volume control range including the maximum volume (step ST4b).
  • step ST3b the determination unit 23 issues a command for prohibiting the VOL control (volume control according to the external operation) according to the VOL operation performed using the external VOL operation unit 25.
  • the VOL control unit 18 is notified (step ST5b). Upon receiving this notification, the VOL control unit 18 ends the process without accepting the VOL operation when reception is impossible.
  • the memory 27 for storing the music data and the reception state of the digital broadcast by the front end unit 3 are determined, and the broadcast content cannot be reproduced due to deterioration of the reception state.
  • a determination unit 23 that causes the back-end unit 4 to reproduce the music data selected from the memory 27 as BGM is provided. Further, in the above configuration, the determination unit 23 cannot receive the broadcast content based on the comparison result between the PER obtained by the error correction processing of the received signal by the OFDM demodulation unit 12 of the front end unit 3 and a predetermined threshold value. It is determined whether or not it is in a state.
  • the setting information acquisition unit 20 that acquires and holds information set by an external operation is provided, and music data to be reproduced as BGM is stored in memory according to the information set by the external operation.
  • 27 is the music data selected from 27.
  • the determination unit 23 performs BGM by the back end unit 3 after a stable time has elapsed from the time when the reception state of the digital broadcast by the front end unit 3 returns from reception impossible to reception possible. Stop playback and resume playback of broadcast content. By doing in this way, it is possible to prevent frequent switching between the process when reception is possible and the process when reception is not possible according to fluctuations in the reception state. Note that, by setting the stable time as a time set by an external operation, it is possible to switch processing between when reception is possible and when reception is impossible according to user preferences.
  • the determination unit 23 determines the reception state of the digital broadcast by the front end unit 3 and the reception content cannot be reproduced due to the deterioration of the reception state
  • the volume change occurs. Is set in the VOL control unit 18, and the VOL control unit 18 receives only an external operation within the set allowable range of volume change and controls the volume.
  • the determination unit 23 notifies the VOL control unit 18 of a command for prohibiting the volume control according to the external operation, and when the VOL control unit 18 receives the prohibition command, the volume control according to the external operation is not performed.
  • the digital receiver determines the reception state of the digital broadcast by the front end unit, and if the broadcast content cannot be reproduced due to the deterioration of the reception state, the music data selected from the storage unit is set as BGM. Since it is played back by the back-end unit, there is an effect that it is possible to convey that the digital broadcast cannot be received due to the deterioration of the reception state in a form adapted to the user's preference without giving the user a discomfort. . Therefore, it is suitable for use in a digital receiver that receives digital broadcasting.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Circuits Of Receivers In General (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

L'invention porte sur un récepteur numérique qui comprend : une mémoire (27) qui stocke des données de composition musicale ; et une unité de détermination (23) qui vérifie l'état de réception de la diffusion numérique par l'unité frontale (3) et amène une unité terminale (4) à reproduire des données de composition musicale sélectionnées à partir de la mémoire (27) sous forme de BGM lors de la détection d'un état à réception désactivée dans lequel le contenu de diffusion ne peut pas être reproduit en raison de la dégradation d'état de réception.
PCT/JP2009/003241 2008-09-02 2009-07-10 Récepteur numérique WO2010026692A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2010527659A JPWO2010026692A1 (ja) 2008-09-02 2009-07-10 デジタル受信機

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008224775 2008-09-02
JP2008-224775 2008-09-02

Publications (1)

Publication Number Publication Date
WO2010026692A1 true WO2010026692A1 (fr) 2010-03-11

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WO (1) WO2010026692A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014053768A (ja) * 2012-09-07 2014-03-20 Alpine Electronics Inc 放送受信機

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09107303A (ja) * 1995-10-07 1997-04-22 Nippon Columbia Co Ltd 放送装置
JP2005348016A (ja) * 2004-06-02 2005-12-15 Sanyo Electric Co Ltd 放送受信移動端末

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4626145B2 (ja) * 2003-12-19 2011-02-02 パナソニック株式会社 音声出力レベル設定方法及び装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09107303A (ja) * 1995-10-07 1997-04-22 Nippon Columbia Co Ltd 放送装置
JP2005348016A (ja) * 2004-06-02 2005-12-15 Sanyo Electric Co Ltd 放送受信移動端末

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014053768A (ja) * 2012-09-07 2014-03-20 Alpine Electronics Inc 放送受信機

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JPWO2010026692A1 (ja) 2012-01-26

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