WO2009130784A1 - Content reproduction system - Google Patents

Content reproduction system Download PDF

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Publication number
WO2009130784A1
WO2009130784A1 PCT/JP2008/058023 JP2008058023W WO2009130784A1 WO 2009130784 A1 WO2009130784 A1 WO 2009130784A1 JP 2008058023 W JP2008058023 W JP 2008058023W WO 2009130784 A1 WO2009130784 A1 WO 2009130784A1
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WO
WIPO (PCT)
Prior art keywords
signal
unit
output
transmission
content
Prior art date
Application number
PCT/JP2008/058023
Other languages
French (fr)
Japanese (ja)
Inventor
章公 辻
健 森
弘 河野
浩和 猪谷
Original Assignee
パイオニア株式会社
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 パイオニア株式会社 filed Critical パイオニア株式会社
Priority to PCT/JP2008/058023 priority Critical patent/WO2009130784A1/en
Priority to JP2010509011A priority patent/JPWO2009130784A1/en
Publication of WO2009130784A1 publication Critical patent/WO2009130784A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards
    • 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
    • H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
    • H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
    • H04N21/43072—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen of multiple content streams on the same device
    • 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
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/4104—Peripherals receiving signals from specially adapted client devices
    • H04N21/4122—Peripherals receiving signals from specially adapted client devices additional display device, e.g. video projector
    • 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
    • H04N21/432—Content retrieval operation from a local storage medium, e.g. hard-disk
    • H04N21/4325—Content retrieval operation from a local storage medium, e.g. hard-disk by playing back content from the storage medium
    • 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
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • 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
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
    • H04N21/43632—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wired protocol, e.g. IEEE 1394
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
    • H04N5/775—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television receiver

Definitions

  • the present invention relates to a content reproduction system for reproducing video and audio.
  • a content reproduction system including a transmitter (player) that provides content via a digital interface such as HDMI (High Definition Multimedia Interface) and a receiver (receiver) that receives and outputs the content is known.
  • a transmitter player
  • a digital interface such as HDMI (High Definition Multimedia Interface)
  • a receiver receiver
  • Patent Document 1 discloses that a receiving apparatus that reproduces video does not output sound that hinders audio reproduction of the receiving apparatus that reproduces audio, and has two HDMI output connectors to reproduce the video.
  • the receiving apparatus describes a transmitting apparatus that transmits a streaming signal having no audio data.
  • Other related techniques are described in Patent Document 2 and Patent Document 3.
  • An object of the present invention is to realize a transmission device capable of reducing noise of an audio signal caused by high-frequency transmission and improving sound quality by minimizing the transmission frequency of the audio signal and the video signal. To do.
  • the content signal including the audio signal and the video signal is received through the digital interface, and at least the first receiving unit for outputting the video signal and the second reception for outputting the audio signal.
  • a second output unit that is the same standard, can output both an audio signal and a video signal, and transmits the content signal to the second receiving unit;
  • a control unit that controls the plurality of output units so that a signal transmitted from the first output unit and a signal transmitted from the second output unit are simultaneously transmitted at different transmission frequencies, respectively.
  • a transmission device at least a first reception unit for outputting a video signal, and a second reception unit for outputting an audio signal.
  • a content reproduction system for transmitting and receiving a content signal including a video signal, wherein the transmission device is capable of outputting both an audio signal and a video signal, and transmits the content signal to the first receiving unit.
  • a second output unit that is the same standard as the first output unit, can output both an audio signal and a video signal, and transmits the content signal to the second receiving unit;
  • the plurality of output units are controlled so that each of the content signals is simultaneously transmitted at different transmission frequencies, and an audio signal is transmitted to the first receiving unit.
  • a control unit that transmits a live prohibition instruction and transmits a video signal reproduction prohibition instruction to the second reception unit, and the first and second reception units receive the content signal and the content from the transmission device, respectively.
  • a reception unit that receives a reproduction prohibition instruction; and a reproduction unit that reproduces an audio signal and / or a video signal included in the content signal, wherein each of the reproduction units has received the reproduction prohibition instruction of the video signal.
  • a content signal including an audio signal and a video signal, at least a first reception unit for outputting a video signal, and a second reception unit for outputting an audio signal through a digital interface.
  • a first output unit that can output both an audio signal and a video signal, and transmits the content signal to the first receiving unit; and the same as the first output unit
  • a second output unit for transmitting the content signal to the second receiving unit, a signal transmitted from the first output unit, and a second signal.
  • a control unit that controls the plurality of output units so as to simultaneously transmit signals transmitted from the output units at different transmission frequencies.
  • the above transmitting apparatus is connected to a plurality of receiving units through a digital interface through a cable compliant with HDMI or the like, and has a plurality of output units and a control unit.
  • Each of the first receiving unit and the second receiving unit represents one receiving device, a circuit having a receiving function, or one or a plurality of hardware or software for realizing the receiving function. Therefore, the first receiving unit and the second receiving unit are realized by one receiving device or separate receiving devices.
  • the first output unit transmits a content signal including an audio signal and a video signal to the first receiving unit.
  • the second output unit can transmit the content signal based on the same transmission standard as the first output unit, and the content signal transmitted by the first output unit and the same content signal optimized for the transmission frequency are transmitted. Transmit to the second receiving unit.
  • the “same standard” means that the transmission system (standard) is the same regardless of the shape of the terminal (plug) connected to the cable. Therefore, HDMI and IEEE 1394 are not the same standard.
  • HDMI is classified into A type, B type, and C type according to the type of plug (or connector) in the version of the standard at the present stage.
  • the first output unit and the second output unit do not depend on the type of interface that is the output destination. That is, the interface for transmitting the content signal output from the first or second output unit to the outside of the transmitting device may be a terminal that can be connected to a cable with the same transmission standard, or wireless communication is possible. A simple adapter may be used.
  • the control unit controls the above-described plurality of output units so that the content signals are simultaneously transmitted at different transmission frequencies.
  • the transmission device can minimize the transmission frequency for transmitting the audio signal and the transmission frequency for transmitting the video signal even when transmitting high-quality video. it can. Therefore, the transmission apparatus can reduce noise caused by high-frequency transmission and improve sound quality.
  • the control unit sets the transmission frequency of the output unit having the first reception unit as a transmission destination as the minimum frequency of the video signal included in the content signal, and the second The transmission frequency of the output unit having the reception unit as the transmission destination is set as the minimum frequency required for the audio signal included in the content signal.
  • the transmission apparatus can minimize the transmission frequency for transmitting the audio signal and the transmission frequency for transmitting the video signal, respectively.
  • control unit uses the audio signal output from the first output unit as a silence signal and the video signal output from the second output unit as a black signal. This is a mask signal. In this way, it is possible to prevent a plurality of receiving units from outputting the same audio and video.
  • the transmitter further includes an input unit that receives an input from the outside, and the control unit is an output unit that uses the first reception unit as a transmission destination based on the input from the input unit. And an output unit having the second receiving unit as a transmission destination. Accordingly, the control unit can control the output unit to transmit the content signal according to an appropriate transmission frequency.
  • control unit sets the first reception unit as a transmission destination based on a control signal received from the first reception unit and / or the second reception unit. An output unit and an output unit having the second receiving unit as a transmission destination are determined. Also according to this aspect, the control unit can control the output unit to transmit the content signal according to an appropriate transmission frequency.
  • a transmission apparatus a first reception unit for outputting at least a video signal, and a second reception unit for outputting an audio signal
  • a content reproduction system for transmitting and receiving a content signal including a signal, wherein the transmission device can output both an audio signal and a video signal, and transmits the content signal to the first receiving unit.
  • An output unit, and a second output unit that is the same standard as the first output unit, can output both an audio signal and a video signal, and transmits the content signal to the second receiving unit; Control the plurality of output units so that the content signals are transmitted simultaneously at different transmission frequencies, and the audio signal is retransmitted to the first receiving unit.
  • a control unit that transmits a prohibition instruction and transmits a reproduction prohibition instruction of a video signal to the second reception unit, wherein the first and second reception units receive the content signal and the reproduction from the transmission device.
  • a reception unit that receives a prohibition instruction; and a reproduction unit that reproduces an audio signal and / or a video signal included in the content signal, each of the reproduction units receiving a reproduction prohibition instruction for the video signal Only the audio signal is reproduced, and only the video signal is reproduced when an instruction to prohibit reproduction of the audio signal is received.
  • the first receiving unit performs video playback
  • the second receiving unit performs audio playback
  • the transmission device includes a first output unit, a second output unit, and a control unit.
  • the first output unit transmits a content signal including an audio signal and a video signal to the first receiving unit.
  • the second output unit can transmit the content signal based on the same transmission standard as the first output unit, and the content signal transmitted by the first output unit and the same content signal optimized for the transmission frequency are transmitted. Transmit to the second receiving unit.
  • the “same standard” means that the transmission system (standard) is the same regardless of the shape of the terminal (plug) connected to the cable. Therefore, HDMI and IEEE 1394 are not the same standard.
  • HDMI is classified into A type, B type, and C type according to the type of plug (or connector) in the version of the standard at the present stage.
  • the first output unit and the second output unit do not depend on the type of interface that is the output destination. That is, the interface for transmitting the content signal output from the first or second output unit to the outside of the transmitting device may be a terminal that can be connected to a cable with the same transmission standard, or wireless communication is possible. A simple adapter may be used.
  • the control unit controls the first output unit and the second output unit so that the content signals are simultaneously transmitted at different transmission frequencies.
  • the control unit transmits a content signal and an audio signal reproduction prohibition instruction to the first receiving unit that performs video reproduction.
  • a content signal is transmitted at a transmission frequency different from that of the first reception unit, and a video signal reproduction prohibition instruction is transmitted to the second reception unit that performs audio reproduction.
  • the first and second receiving units reproduce the content signal in accordance with the received reproduction prohibition instruction.
  • the content reproduction system can set the transmission frequency of the audio signal and the transmission frequency of the video signal to transmission frequencies suitable for each transmission, reduce noise caused by high-frequency transmission, Sound quality can be improved.
  • the transmission standard to which the first and second output units comply is HDMI.
  • the transmission apparatus can reduce noise caused by high-frequency transmission of HDMI and improve sound quality.
  • FIG. 1 shows a reproduction system (hereinafter referred to as “content reproduction system”) of a reproduction signal (hereinafter referred to as “content signal”) including a video signal, an audio signal, or both in the first embodiment.
  • content reproduction system includes a transmission device 100, a first reception device 200, and a second reception device 300.
  • functions and configurations of these will be described.
  • the transmission device 100 is a device that transmits content signals to the reception devices 200 and 300.
  • the transmission device 100 corresponds to, for example, a DVD player, a Blu-ray player, or the like.
  • the transmission device 100 is connected to the first reception device 200 by a cable compliant with a multimedia interface standard such as HDMI or IEEE 1394 that can simultaneously transmit a video signal and an audio signal.
  • the transmission device 100 is connected to the second reception device 200 via a cable conforming to HDMI or the like.
  • the transmission device 100 performs communication based on HDMI to the first reception device 200 and the second reception device 300.
  • the transmission apparatus 100 includes a control unit 101, a decoding unit 102, a first output unit 103, a second output unit 104, a first interface 130, and a second interface 140.
  • the control unit 101 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), and a ROM (Read Only Memory) (not shown), and performs overall control of the transmission apparatus 100.
  • the control unit 101 transmits information Sd (hereinafter, “output information Sd”) about the frequency (hereinafter referred to as “transmission frequency”) for transmitting the content signal to the first output unit 103 and the second output unit 104. Called).
  • the decoding unit 102 decodes the content.
  • the decoding unit 102 reads content stored by an auxiliary storage unit such as a hard disk (not shown) or the like, or content transmitted from another device (not shown) that is electromagnetically connected to the transmission device 100.
  • the audio signal included in the content is referred to as “audio signal Sa”
  • the video signal is referred to as “video signal Sv”.
  • the decoding unit 102 transmits the video signal Sv and the audio signal Sa generated by decoding the content to the first output unit 103 and the second output unit 104, respectively.
  • the decoding unit 102 notifies the control unit 101 of the specifications of the video signal Sv and the audio signal Sa, for example, whether the video is 1080p.
  • “1080p” represents a progressive scan video image with 1080 lines (1125 total scan lines) and a frame frequency of 59.94 Hz.
  • the first output unit 103 performs processing necessary for communicating with other devices via the first interface 130.
  • the first output unit 103 performs the video signal Sv and the audio signal Sa received from the decoding unit 102 in accordance with a predetermined transmission frequency f1 (hereinafter referred to as “first transmission frequency f1”). 1 to the first receiving device 200.
  • the second output unit 104 executes processing necessary for communicating with other devices via the second interface 140.
  • the second output unit 104 uses the video signal Sv and the audio signal Sa received from the decoding unit 102 in accordance with a predetermined transmission frequency f2 (hereinafter referred to as “second transmission frequency f2”). 2 to the receiving device 300.
  • the first interface 130 and the second interface 140 are interfaces (plugs) that can be connected to a cable conforming to a predetermined standard such as HDMI, and transmit / receive content signals, EDID (Extended display identification data), and CEC. Control signals such as (Consumer Electronics Control) are transmitted and received.
  • control signal C1 the control signal communicated by the first interface 130
  • control signal C2 the control signal communicated by the second interface 140
  • the first interface 130 is electromagnetically connected to the interface 210 of the first receiving device 200 via a cable compliant with HDMI
  • the second interface 140 is connected to the second receiving device 300.
  • the interface 310 is electromagnetically connected via an HDMI-compliant cable.
  • the first receiving device 200 receives the video signal Sv and the audio signal Sa from the transmitting device 100 and reproduces the video signal Sv.
  • the first receiving device 200 includes an input unit 201, a video output unit 202, and an interface 210.
  • the first receiving device 200 corresponds to, for example, a plasma television.
  • the input unit 201 receives the content signal transmitted from the transmission device 100 via the interface 210. Then, the input unit 201 supplies the video signal Sv among the received content signals to the video output unit 202.
  • the video output unit 202 corresponds to a display or the like, and displays a video according to the supplied video signal Sv.
  • the first receiving device 200 has an audio output capability, but does not output audio.
  • the second receiving device 300 receives the video signal Sv and the audio signal Sa from the transmitting device 100, and reproduces the audio signal Sa.
  • the second receiving apparatus 300 corresponds to, for example, an AV receiver.
  • the second receiving device 300 includes an input unit 301 and an interface 310.
  • the input unit 301 receives the content signal transmitted from the transmission device 100 via the interface 310. Then, the input unit 301 supplies the audio signal Sa among the received content signals to the audio output device 350.
  • the second receiving device 300 has a video output capability, but does not output a video.
  • the audio output device 350 receives the audio signal Sa supplied from the second receiving device 300 and outputs (reproduces) the audio signal Sa.
  • the sound output device 350 corresponds to, for example, a speaker.
  • the second receiving device 300 may include an audio output device 350.
  • the second receiving device 300 and the audio output device 350 are realized by a single device.
  • the audio output device 350 receives the audio signal Sa from the input unit 301 through a bus in the second receiving device 300, for example.
  • the video frequency “Ax” (“x” is a positive number) represents the lowest frequency (hereinafter referred to as “required minimum video frequency”) necessary to transmit the video signal Sv of each specification. . Further, Ax represents a higher frequency as the value of “x” is higher. Similarly, the audio frequency “ax” represents the lowest frequency (hereinafter referred to as “required minimum audio frequency”) necessary for the transmitting apparatus 100 to transmit the audio signal Sa of each specification. It is assumed that ax represents a higher frequency as the value of “x” is higher.
  • the transmission is based on the transmission frequency of the video signal Sv (hereinafter referred to as “video superior case”), and the transmission frequency of the audio signal Sa is used as a reference.
  • video superior case the necessary minimum video frequency Ax is set as the transmission frequency, and the video signal Sv and the audio signal Sa are transmitted at the transmission frequency.
  • audio superior case the necessary minimum audio frequency ax is set as the transmission frequency, and the video signal Sv and the audio signal Sa are transmitted at the transmission frequency.
  • a set of a required minimum video frequency and a required minimum audio frequency used by the transmission apparatus 100 is determined in advance.
  • a set of a required minimum video frequency and a required minimum audio frequency that can be used by the transmission apparatus 100 is expressed as a frequency set (Ax, ax).
  • the necessary minimum video frequency Ax is set to a value equal to or higher than the necessary minimum audio frequency ax
  • the necessary minimum video frequency Ax is set to a value equal to or lower than the necessary minimum video frequency ax.
  • the control unit 101 of the transmitting apparatus 100 When the output of the video signal Sv and the output of the audio signal Sa are performed by different receiving apparatuses as in the content reproduction system shown in FIG. 1, the control unit 101 of the transmitting apparatus 100 generally has a first transmission frequency. It is conceivable to make f1 and the second transmission frequency f2 the same (hereinafter referred to as “comparative example”). However, in general, the transmission frequency necessary for transmitting the video signal Sv is different from the transmission frequency necessary for transmitting the audio signal Sa. Therefore, for example, in the case of a video superior case, the transmission device 100 transmits the audio signal Sa at a transmission frequency that is faster than necessary.
  • the receiving apparatus 300 that reproduces the audio signal Sa receives the audio signal Sa at a transmission frequency higher than necessary, the receiving apparatus 300 is strongly influenced by noise due to unnecessary radiation and the like, and the noise is generated when the signal on the receiving side is restored. It may adversely affect the playback sound quality.
  • the transmission device 100 transmits the video signal Sv at a transmission frequency that is faster than necessary. Therefore, since the receiving device 200 that reproduces the video signal Sv receives the video signal Sv at a transmission frequency higher than necessary, the receiving device 200 is strongly affected by noise due to unnecessary radiation and the like, and the noise is generated when the signal on the receiving side is restored. It may adversely affect the playback image quality.
  • the control unit 101 controls the first output unit 103 and the second output unit 104 to output content signals at different transmission frequencies. That is, the control unit 101 sets the first transmission frequency f1 and the second transmission frequency f2 according to whether the first reception device 200 and the second reception device 300 reproduce audio or video. Set each to the minimum frequency required. This will be described in detail below.
  • the control unit 101 provides the first output unit 103 with information Sd (hereinafter referred to as “output”) indicating whether to output (transmit) the video signal Sv and the audio signal Sa based on the minimum required video frequency or the minimum required audio frequency. Information Sd ").
  • the first output unit 103 is connected to the first receiving device 200 that reproduces video. Therefore, the control unit 101 transmits output information Sd indicating that the first transmission frequency f1 is determined based on the necessary minimum video frequency to the first output unit 103.
  • the control unit 101 transmits to the first output unit 103 the first transmission frequency f1 determined based on the necessary minimum video frequency as output information Sd.
  • the transmitting apparatus 100 transmits the video signal Sv to the first receiving apparatus 200 at the minimum transmission frequency necessary for transmitting the video signal Sv even in the audio superior case. Can do. Therefore, the transmission device 100 can reduce the influence of noise generated in the video signal Sv due to the transmission of the video signal Sv at a transmission frequency higher than necessary.
  • the first receiving device 200 receives the audio signal Sa even though it does not output audio. Therefore, the first receiving apparatus 200 needs to be controlled so as not to reproduce the received audio signal Sa.
  • the user may operate the first receiving device 200 and stop outputting the sound.
  • the transmission apparatus 100 may give the first reception apparatus 200 a control signal C1 including an instruction to stop outputting audio.
  • the first receiving device 100 may replace the audio signal Sa transmitted by the first output unit 103 with a silence signal. By any of these, the transmission apparatus 100 can stop outputting the sound when the first receiving apparatus 200 can also reproduce the sound.
  • the control unit 101 transmits output information Sd to the second output unit 104 to determine the second transmission frequency f2 based on the necessary minimum audio frequency.
  • the control unit 101 transmits, as output information Sd, the second transmission frequency f2 determined based on the necessary minimum audio frequency to the second output unit 104.
  • the transmitting apparatus 100 transmits the audio signal Sa to the second receiving apparatus 300 at the minimum transmission frequency necessary for transmitting the audio signal Sa even in the video superior case. Can do. Therefore, the transmission device 100 can reduce the influence of noise generated in the audio signal Sa due to the transmission of the audio signal Sa at a transmission frequency higher than necessary.
  • the second receiving device 300 receives the video signal Sv even though it does not output the video. Therefore, the second receiving device 300 needs to be controlled so as not to reproduce the received video signal Sv.
  • the user may operate the second receiving device 300 to stop the output of the video.
  • the transmission device 100 may give the second reception device 300 a control signal C2 including an instruction to stop video output.
  • the first receiving apparatus 100 uses the video signal Sv transmitted by the second output unit 103 as a video signal indicating a single color screen such as black (hereinafter referred to as “black mask signal”). .). Accordingly, the transmission device 100 can stop the output of the video when the second reception device 300 can also reproduce the video.
  • the control unit 101 determines the output information Sd by input from the user. Specifically, the control unit 101 receives an input from the user that the first receiving device 200 reproduces the video and the second receiving device 300 reproduces the audio. Output information Sd is notified to the output unit 103 and the second output unit 104.
  • the transmission device 100 separately includes an input unit such as a button or a touch panel (not shown) on the outer surface, and enables input from the user.
  • control unit 101 may determine the output information Sd based on the control signal C1 transmitted from the first receiving device 200 and the control signal C2 transmitted from the second receiving device 300.
  • the transmission apparatus 100 uses the CEC channel, for example, to the first reception apparatus 200 and the second reception apparatus 300 as to whether or not they are audio reproduction dedicated devices or video reproduction dedicated devices. To get. Then, the transmission frequency is determined based on the necessary minimum audio frequency for the audio reproduction dedicated device, and the transmission frequency is determined based on the necessary minimum video frequency for the video reproduction dedicated device.
  • FIG. 2 is an example of a table showing the relationship among the transmission frequency, the required minimum video frequency, and the required minimum audio frequency in the video superior case.
  • “Output 1” in the table represents an output at the first interface 130
  • “Output 2” represents an output at the second interface 140. That is, the transmission frequency of output 1 indicates the first transmission frequency f1, and the transmission frequency of output 2 indicates the second transmission frequency f2.
  • FIG. 2 (a) shows that in the video superior case, when the user desires to view by the frequency set (A1, a3), that is, the required video frequency, not the required audio frequency, determines the transmission frequency for the format to be reproduced.
  • Tables corresponding respectively to the first example and the comparative example in the case of the target are shown.
  • the transmission frequency at the output 2 originally transmits the audio signal Sa. Is greater than the frequency required. That is, the necessary minimum frequency for transmitting the audio signal Sa is a1, but since the transmission frequency is adjusted to the necessary minimum video frequency, the output 2 transmits the audio signal Sa at a transmission frequency higher than necessary. Become.
  • the transmitting apparatus 100 reproduces the contents that the respective output destination receiving apparatuses reproduce the first transmission frequency f1 and the second transmission frequency f2, that is, the audio. Or set according to whether to play the video. Therefore, the transmitting apparatus 100 sets the necessary minimum video frequency A3 corresponding to the necessary minimum audio frequency a3 to the transmission frequency of output 2, and transmits the video signal Sv and the audio signal Sa to the second receiving apparatus 300. Thereby, the transmission device 100 can suppress the second transmission frequency f2 to the lowest frequency necessary for transmitting the audio signal Sa, and noise generated in the audio signal Sa in the second reception device 300 can be reduced. Can be reduced.
  • the transmission device 100 may replace the video signal Sv transmitted to the second reception device 300 with a black mask signal.
  • the second receiving device 300 may discard the received video signal Sv or switch to a single color display such as black. Thereby, the second receiving device 300 is controlled not to display an image.
  • the transmission device 100 may replace the audio signal Sa transmitted to the first reception device 200 with a silence signal.
  • the first receiving device 200 may discard or mute the audio signal Sa. Thereby, the first receiving device 200 is controlled not to output sound.
  • FIG. 2 (b) shows the relationship between the transmission frequency, the required minimum video frequency, and the required minimum audio frequency when the user wants to view content with 1080p video and audio 2CH LPCM quality (specification) in the video superior case.
  • surface which shows. That is, FIG. 2B replaces the required minimum video frequency A1 with 148.5 MHz, the required minimum transmission frequency A3 corresponding to the minimum audio frequency a3 with 27 MHz, and the required minimum audio frequency a3 with 27 MHz in FIG. It is a table.
  • the transmission device 100 transmits the content signal by setting the transmission frequency of the output 1 and the transmission frequency of the output 2 to 148.5 MHz.
  • the transmission device 100 sets the transmission frequency of output 1 to 148.5 MHz and the transmission frequency of output 2 to 27 MHz. Thereby, the transmission apparatus 100 can reduce the influence of noise resulting from the high-speed transmission of the audio signal Sa.
  • FIG. 3 is an example of a table showing the relationship among the transmission frequency, the required minimum video frequency, and the required minimum audio frequency in the audio superior case.
  • FIG. 3A shows a case where the user desires to view the frequency set (A3, a1) in the audio superior case, that is, the audio frequency is not the video frequency but the transmission frequency is higher than the video frequency for the format to be reproduced.
  • surface corresponding to the 1st Example and comparative example in the case where it becomes dominant in determination is shown.
  • the transmission frequency of output 1 and the transmission frequency of output 2 are the same, so the transmission frequency at output 1 is the lowest frequency that is originally necessary for transmitting the video signal Sv. Bigger than.
  • the transmission device 100 sets the video frequency A3 to the transmission frequency of output 1, and transmits the video signal Sv and the audio signal Sa.
  • the transmission apparatus 100 can suppress the transmission frequency at the output 1 to a necessary minimum, and can reduce the occurrence of noise in the video signal Sv due to the high-frequency transmission.
  • the transmission device 100 may replace the audio signal Sa transmitted to the first reception device 200 with a silence signal.
  • the first receiving device 200 may discard the audio signal Sa or set it to mute. Thereby, the first receiving device 200 is controlled not to output sound.
  • the transmission device 100 may replace the video signal Sv transmitted to the second reception device 300 with a black mask signal.
  • the second receiving device 300 may discard the video signal Sv or switch to a single color display such as black. Thereby, the second receiving device 300 is controlled not to display an image.
  • FIG. 3B is a table showing the relationship between the transmission frequency, the required minimum video frequency, and the required minimum audio frequency when the user desires to view the content according to the quality of video 480i and audio DTS-HD Master Audio. It is an example. That is, FIG. 3B is the same as FIG. 3A, in which the required minimum transmission frequency A3 is 27 MHz when the required voice frequency is a3, the required minimum transmission frequency A1 is 54 MHz when the required voice frequency is a1, and the required minimum. It is the table
  • “480i” represents an image of an interlaced scanning method with 480 effective scanning lines (total scanning line 525) and a frame frequency of 29.97 Hz. As shown in FIG.
  • the transmission device 100 transmits the content signal with the transmission frequency of output 1 and the transmission frequency of output 2 set to 54 MHz.
  • the transmission device 100 sets the transmission frequency of output 1 to 27 MHz and the transmission frequency of output 2 to 54 MHz. That is, in the first embodiment, the transmission device 100 sets the transmission frequency to the first reception device 200 to the lowest frequency necessary for transmitting the video signal Sv. Thereby, the transmission apparatus 100 can reduce the influence of noise of the video signal Sv due to high-speed transmission.
  • FIG. 4 shows a configuration of a content reproduction system according to the second embodiment.
  • the content reproduction system includes a transmission device 100 and a reception device 400.
  • the receiving device 400 includes a first input unit 401, a second input unit 402, an interface 410, an interface 420, a video output unit 403, and an audio output unit 404.
  • the first input unit 401 receives the video signal Sv and the audio signal Sa transmitted from the first interface 130 of the transmission device 100 via the interface 410. Further, the first input unit 401 discards the audio signal Sa among the received signals and supplies the video signal Sv to the video output unit 403.
  • the video output unit 403 displays a video based on the supplied video signal Sv.
  • the second input unit 402 receives the video signal Sv and the audio signal Sa transmitted from the second interface 140 of the transmission device 100 via the interface 420. Further, the second input unit 402 discards the video signal Sv among the received signals and supplies the audio signal Sa to the audio output unit 404.
  • the audio output unit 404 outputs audio based on the supplied audio signal Sa.
  • the audio output unit 404 is arranged in the reception device 400, but may be a device (separate body) different from the reception device 400. In this case, the receiving device 400 and the audio output unit 403 are electromagnetically connected via a cable or the like.
  • the video signal Sv and the audio signal Sa received via the interface 410 are transmitted based on the video frequency. That is, the first transmission frequency f1 is determined based on the necessary minimum video frequency. Therefore, the video signal Sv is not affected by noise caused by the transmission frequency even if the audio frequency is high in the audio dominant case.
  • the video signal Sv and the audio signal Sa received via the interface 420 are transmitted based on the necessary minimum audio frequency. That is, the second transmission frequency f2 is determined based on the necessary minimum audio frequency. Therefore, the audio signal Sa is not affected by noise caused by the transmission frequency even if the video frequency is high in the video dominant case.
  • the receiving apparatus 400 supplies the video signal Sv received via the interface 410 to the video output unit 403 and supplies the audio signal Sa received via the interface 420 to the audio output unit 404, thereby providing a video superior case. Even so, it is possible to reduce the influence of noise of the audio signal Sa caused by high-speed transmission.
  • the receiving apparatus 400 can reduce the influence of the noise of the video signal Sv resulting from the high-speed transmission even in the audio superior case.
  • the transmitting apparatus is connected to the first receiving apparatus and the second receiving apparatus via a cable or the like conforming to HDMI, and the first and second interfaces, And a second output unit and a control unit.
  • the first output unit supplies content to the first interface according to the first transmission frequency.
  • the second output unit supplies the content to the second interface according to the second transmission frequency.
  • the control unit notifies the first and second output units of output information indicating whether the first and second transmission frequencies should be determined based on the minimum required audio frequency or the minimum required video frequency.
  • the transmission device can suppress the transmission frequency for transmitting the audio signal even when transmitting a high-quality video. Therefore, the transmission apparatus can reduce noise caused by high-frequency transmission and improve sound quality. Further, the transmission device can suppress the transmission frequency for transmitting the video signal even when transmitting high-quality audio. Therefore, the transmission device can reduce noise caused by high-frequency transmission and improve image quality.
  • the content playback system has two systems, a system (line) for transmitting and reproducing audio signals and a system for transmitting and reproducing video signals.
  • the configuration to which the present invention is applicable is not limited to this.
  • the content reproduction system may have a configuration including three or more systems (hereinafter referred to as “content reproduction system according to a modification”).
  • the content reproduction system according to the modification has at least a system for transmitting and reproducing an audio signal and a system for transmitting and reproducing a video signal.
  • the transmission device 100 includes a third output unit that transmits a content signal in addition to the first output unit 103 and the second output unit 104, and includes a third output unit.
  • the receiving apparatus receives the content signal output by the third output unit, and reproduces the video signal or the audio signal.
  • the present invention can be used in a content reproduction system that transmits and reproduces content between multiple devices.

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Abstract

A transmitting device is connected to a plurality of receiving units using cables, etc. conforming to the HDMI or the like via a digital interface, and includes a plurality of output portions and a control portion. The first output portion transmits a content signal containing an audio signal and a video signal to the first receiving unit. The second output portion is capable of transmitting a content signal based on the same transmission standard as the first output portion uses, and transmits the same content signal as the one transmitted from the first output portion to the second receiving unit. The control portion controls the plurality of output portions so that these output portions may simultaneously transmit the content signal in different transmission frequencies. Due to this structure, the transmitting device can minimize the transmission frequency for transmitting audio signals and the transmission frequency for transmitting video signals even if it transmits high-quality videos. Consequently, the transmitting device can be reduced in noise attributable to high-frequency transmission and can also be improved in sound quality.

Description

コンテンツ再生システムContent playback system
　本発明は、映像や音声の再生を行うコンテンツ再生システムに関する。 The present invention relates to a content reproduction system for reproducing video and audio.
　ＨＤＭＩ（Ｈｉｇｈ　Ｄｅｆｉｎｉｔｉｏｎ　Ｍｕｌｔｉｍｅｄｉａ　Ｉｎｔｅｒｆａｃｅ）などのデジタルインタフェースを介してコンテンツを提供する送信機（プレーヤー）及びそのコンテンツを受信し出力する受信機（レシーバー）からなるコンテンツ再生システムが既知である。 2. Description of the Related Art A content reproduction system including a transmitter (player) that provides content via a digital interface such as HDMI (High Definition Multimedia Interface) and a receiver (receiver) that receives and outputs the content is known.
　例えば、特許文献１には、映像を再生する受信装置が、音声を再生する受信装置の音声再生を阻害する音を出力しないようにするため、ＨＤＭＩ出力コネクタを２つ有し、映像を再生する受信装置には音声データを有しないストリーミング信号を送信する送信装置が記載されている。その他、関連する技術が特許文献２及び特許文献３に記載されている。 For example, Patent Document 1 discloses that a receiving apparatus that reproduces video does not output sound that hinders audio reproduction of the receiving apparatus that reproduces audio, and has two HDMI output connectors to reproduce the video. The receiving apparatus describes a transmitting apparatus that transmits a streaming signal having no audio data. Other related techniques are described in Patent Document 2 and Patent Document 3.
特開２００７－２５８８６７号公報JP 2007-258867 A 特開２００７－２４３４６０号公報JP 2007-243460 A 特開２００５－０５７７１４号公報JP 2005-057714 A
　ＨＤＭＩによるコンテンツの伝送において規格の都合上、本来の音声信号復元に必要な最低周波数以上の決められた伝送周波数で信号伝送を行う必要があり、そのため受信側で音声信号を復元の際、受信側でその伝送周波数の高周波ノイズの影響を受け、復元後の音質に劣化を生じる場合がある。また、高品質の映像を送信する場合、送信装置は、コンテンツの伝送周波数を高周波に設定する必要がある。よってこの場合、高周波伝送に起因して音質劣化が生じる可能性がある。しかし、特許文献１乃至３には、上述の問題について何ら検討されていない。 In the transmission of content by HDMI, it is necessary to perform signal transmission at a predetermined transmission frequency that is higher than the minimum frequency necessary for original audio signal restoration due to the standards, so when the audio signal is restored on the receiving side, the receiving side Therefore, the sound quality after restoration may be deteriorated due to the influence of high frequency noise of the transmission frequency. Further, when transmitting a high-quality video, the transmission device needs to set the content transmission frequency to a high frequency. Therefore, in this case, sound quality may be deteriorated due to high frequency transmission. However, Patent Documents 1 to 3 do not discuss any of the above problems.
　本発明が解決しようとする課題としては、上記のようなものが例として挙げられる。本発明は、音声信号及び映像信号の伝送周波数を最小限に抑えることで、高周波伝送に起因する音声信号のノイズを低減し、音質改善を図ることが可能な送信装置を実現することを目的とする。 Examples of problems to be solved by the present invention include the above. An object of the present invention is to realize a transmission device capable of reducing noise of an audio signal caused by high-frequency transmission and improving sound quality by minimizing the transmission frequency of the audio signal and the video signal. To do.
　請求項１に記載の発明では、デジタルインタフェースを通じて、音声信号と映像信号とを含むコンテンツ信号を、少なくとも映像信号を出力するための第１の受信ユニットと音声信号を出力するための第２の受信ユニットへ伝送する送信装置であって、音声信号と映像信号とを共に出力可能であり、前記第１の受信ユニットへ前記コンテンツ信号を送信する第１の出力部と、前記第１の出力部と同一規格であり、音声信号と映像信号とを共に出力可能であり、前記第２の受信ユニットへ前記コンテンツ信号を送信する第２の出力部と、
　第１の出力部から送信される信号と第２の出力部から送信される信号を夫々異なる伝送周波数で同時に伝送するように前記複数の出力部を制御する制御部と、を備えることを特徴とする。 According to the first aspect of the present invention, the content signal including the audio signal and the video signal is received through the digital interface, and at least the first receiving unit for outputting the video signal and the second reception for outputting the audio signal. A transmission device for transmitting to a unit, capable of outputting both an audio signal and a video signal, and a first output unit for transmitting the content signal to the first reception unit; and the first output unit; A second output unit that is the same standard, can output both an audio signal and a video signal, and transmits the content signal to the second receiving unit;
A control unit that controls the plurality of output units so that a signal transmitted from the first output unit and a signal transmitted from the second output unit are simultaneously transmitted at different transmission frequencies, respectively. To do.
　請求項６に記載の発明では、送信装置と、少なくとも映像信号を出力するための第１の受信ユニットと、音声信号を出力するための第２の受信ユニットとを備え、デジタルインタフェースを通じて音声信号と映像信号とを含むコンテンツ信号を送受信するコンテンツ再生システムであって、前記送信装置は、音声信号と映像信号とを共に出力可能であり、前記第１の受信ユニットへ前記コンテンツ信号を送信する第１の出力部と、前記第１の出力部と同一規格であり、音声信号と映像信号とを共に出力可能であり、前記第２の受信ユニットへ前記コンテンツ信号を送信する第２の出力部と、各々が異なる伝送周波数で前記コンテンツ信号を同時に伝送するように前記複数の出力部を制御するとともに、前記第１の受信ユニットに音声信号の再生禁止指示を送信し、前記第２の受信ユニットに映像信号の再生禁止指示を送信する制御部と、を備え、前記第１及び第２の受信ユニットは、前記送信装置から前記コンテンツ信号及び前記再生禁止指示を受信する受信部と、前記コンテンツ信号に含まれる音声信号及び／又は映像信号を再生する再生部と、を備え、前記再生部の各々は、前記映像信号の再生禁止指示を受信したときに前記音声信号のみを再生し、前記音声信号の再生禁止指示を受信したときに前記映像信号のみを再生することを特徴とする。 According to a sixth aspect of the present invention, there is provided a transmission device, at least a first reception unit for outputting a video signal, and a second reception unit for outputting an audio signal. A content reproduction system for transmitting and receiving a content signal including a video signal, wherein the transmission device is capable of outputting both an audio signal and a video signal, and transmits the content signal to the first receiving unit. A second output unit that is the same standard as the first output unit, can output both an audio signal and a video signal, and transmits the content signal to the second receiving unit; The plurality of output units are controlled so that each of the content signals is simultaneously transmitted at different transmission frequencies, and an audio signal is transmitted to the first receiving unit. A control unit that transmits a live prohibition instruction and transmits a video signal reproduction prohibition instruction to the second reception unit, and the first and second reception units receive the content signal and the content from the transmission device, respectively. A reception unit that receives a reproduction prohibition instruction; and a reproduction unit that reproduces an audio signal and / or a video signal included in the content signal, wherein each of the reproduction units has received the reproduction prohibition instruction of the video signal Sometimes only the audio signal is reproduced, and only the video signal is reproduced when an instruction to prohibit reproduction of the audio signal is received.
第１実施例に係るコンテンツ再生システムの構成を示す図である。It is a figure which shows the structure of the content reproduction system which concerns on 1st Example. 音声優位ケースにおける伝送周波数と、音声周波数と、映像周波数との関係を示す表の一例である。It is an example of the table | surface which shows the relationship between the transmission frequency in an audio | voice dominant case, an audio | voice frequency, and a video frequency. 映像優位ケースにおける伝送周波数と、音声周波数と、映像周波数との関係を示す表の一例である。It is an example of the table | surface which shows the relationship between the transmission frequency in an image | video dominant case, an audio | voice frequency, and an image frequency. 第２実施例に係るコンテンツ再生システムの構成を示す図である。It is a figure which shows the structure of the content reproduction system which concerns on 2nd Example.
符号の説明Explanation of symbols
　１００　送信装置
　１０１　制御部
　１０２　デコード部
　１０３　第１の出力部
　１０４　第２の出力部
　２００　第１の受信装置
　２０１、３０１　入力部
　３００　第２の受信装置
　３５０　音声出力装置
　４００　受信装置 DESCRIPTION OF SYMBOLS 100 Transmission apparatus 101 Control part 102 Decoding part 103 1st output part 104 2nd output part 200 1st receiver 201, 301 Input part 300 2nd receiver 350 Audio | voice output apparatus 400 Receiver
　本発明の１つの観点では、デジタルインタフェースを通じて、音声信号と映像信号とを含むコンテンツ信号を、少なくとも映像信号を出力するための第１の受信ユニットと音声信号を出力するための第２の受信ユニットへ伝送する送信装置であって、音声信号と映像信号とを共に出力可能であり、前記第１の受信ユニットへ前記コンテンツ信号を送信する第１の出力部と、前記第１の出力部と同一規格であり、音声信号と映像信号とを共に出力可能であり、前記第２の受信ユニットへ前記コンテンツ信号を送信する第２の出力部と、第１の出力部から送信される信号と第２の出力部から送信される信号を夫々異なる伝送周波数で同時に伝送するように前記複数の出力部を制御する制御部と、を備える。 In one aspect of the present invention, a content signal including an audio signal and a video signal, at least a first reception unit for outputting a video signal, and a second reception unit for outputting an audio signal through a digital interface. A first output unit that can output both an audio signal and a video signal, and transmits the content signal to the first receiving unit; and the same as the first output unit A second output unit for transmitting the content signal to the second receiving unit, a signal transmitted from the first output unit, and a second signal. And a control unit that controls the plurality of output units so as to simultaneously transmit signals transmitted from the output units at different transmission frequencies.
　上記の送信装置は、デジタルインタフェースを通じて、ＨＤＭＩなどに準拠したケーブル等により複数の受信ユニットと接続し、複数の出力部と、制御部と、を有する。第１の受信ユニットと第２の受信ユニットは、それぞれ、一台の受信装置、または受信機能を有する回路、その他受信機能を実現する１または複数のハードウェアまたはソフトウェアを表す。従って、第１の受信ユニットと第２の受信ユニットは、１台の受信装置、または別々の受信装置により実現される。 The above transmitting apparatus is connected to a plurality of receiving units through a digital interface through a cable compliant with HDMI or the like, and has a plurality of output units and a control unit. Each of the first receiving unit and the second receiving unit represents one receiving device, a circuit having a receiving function, or one or a plurality of hardware or software for realizing the receiving function. Therefore, the first receiving unit and the second receiving unit are realized by one receiving device or separate receiving devices.
　第１の出力部は、第１の受信ユニットへ音声信号と映像信号とを含むコンテンツ信号を送信する。第２の出力部は、第１の出力部と同一の伝送規格に基づきコンテンツ信号の伝送が可能であり、第１の出力部が送信したコンテンツ信号と伝送周波数を最適化した同一のコンテンツ信号を第２の受信ユニットへ送信する。ここで、「同一規格」とは、ケーブルと接続する端子（プラグ）の形状等に依らず、伝送方式（規格）が同一であることを指す。従って、ＨＤＭＩとＩＥＥＥ１３９４とは同一の規格ではない。一方、ＨＤＭＩは現段階の規格のバージョンではプラグ（又はコネクタ）のタイプによりＡタイプ、Ｂタイプ、Ｃタイプに分類されるが、ここではこれらは全て同一規格とする。また、第１の出力部と第２の出力部は、出力先であるインタフェースの種類には依存しない。即ち、第１又は第２の出力部から出力されるコンテンツ信号を、送信装置外へ伝送するためのインタフェースは、同一伝送規格でケーブルと接続可能な端子であってもよく、または無線通信が可能なアダプタであってもよい。 The first output unit transmits a content signal including an audio signal and a video signal to the first receiving unit. The second output unit can transmit the content signal based on the same transmission standard as the first output unit, and the content signal transmitted by the first output unit and the same content signal optimized for the transmission frequency are transmitted. Transmit to the second receiving unit. Here, the “same standard” means that the transmission system (standard) is the same regardless of the shape of the terminal (plug) connected to the cable. Therefore, HDMI and IEEE 1394 are not the same standard. On the other hand, HDMI is classified into A type, B type, and C type according to the type of plug (or connector) in the version of the standard at the present stage. The first output unit and the second output unit do not depend on the type of interface that is the output destination. That is, the interface for transmitting the content signal output from the first or second output unit to the outside of the transmitting device may be a terminal that can be connected to a cable with the same transmission standard, or wireless communication is possible. A simple adapter may be used.
　制御部は、各々が異なる伝送周波数でコンテンツ信号を同時に伝送するように上述の複数の出力部を制御する。このようにすることで、送信装置は、高品質な映像を送信する場合であっても、音声信号を送信するための伝送周波数及び映像信号を送信するための伝送周波数を最小限に抑えることができる。従って、送信装置は、高周波伝送に起因するノイズを低減し、音質改善を図ることが可能となる。 The control unit controls the above-described plurality of output units so that the content signals are simultaneously transmitted at different transmission frequencies. By doing so, the transmission device can minimize the transmission frequency for transmitting the audio signal and the transmission frequency for transmitting the video signal even when transmitting high-quality video. it can. Therefore, the transmission apparatus can reduce noise caused by high-frequency transmission and improve sound quality.
　上記の送信装置の一態様では、前記制御部は、前記第１の受信ユニットを伝送先とする出力部の伝送周波数を、当該コンテンツ信号に含まれる映像信号の必要最低周波数とし、前記第２の受信ユニットを伝送先とする出力部の伝送周波数を、当該コンテンツ信号に含まれる音声信号の必要最低周波数とする。このようにすることで、送信装置は、音声信号を送信するための伝送周波数及び映像信号を送信するための伝送周波数をそれぞれ最小限に抑えることができる。 In one aspect of the above transmission apparatus, the control unit sets the transmission frequency of the output unit having the first reception unit as a transmission destination as the minimum frequency of the video signal included in the content signal, and the second The transmission frequency of the output unit having the reception unit as the transmission destination is set as the minimum frequency required for the audio signal included in the content signal. By doing so, the transmission apparatus can minimize the transmission frequency for transmitting the audio signal and the transmission frequency for transmitting the video signal, respectively.
　上記の送信装置の他の一態様では、前記制御部は、前記制御部は、前記第１の出力部が出力する音声信号を無音信号とし、前記第２の出力部が出力する映像信号を黒マスク信号とする。このようにすることで、複数の受信ユニットがそれぞれ同一の音声と映像とを出力することを防ぐことが可能となる。 In another aspect of the above transmission apparatus, the control unit uses the audio signal output from the first output unit as a silence signal and the video signal output from the second output unit as a black signal. This is a mask signal. In this way, it is possible to prevent a plurality of receiving units from outputting the same audio and video.
　上記の送信装置の他の一態様では、外部からの入力を受け取る入力部をさらに備え、前記制御部は、前記入力部からの入力に基づき、前記第１の受信ユニットを伝送先とする出力部と、前記第２の受信ユニットを伝送先とする出力部とを決定する。これにより、制御部は、出力部に対し、適切な伝送周波数に従ってコンテンツ信号を伝送するように制御することが可能となる。 In another aspect of the above transmission apparatus, the transmitter further includes an input unit that receives an input from the outside, and the control unit is an output unit that uses the first reception unit as a transmission destination based on the input from the input unit. And an output unit having the second receiving unit as a transmission destination. Accordingly, the control unit can control the output unit to transmit the content signal according to an appropriate transmission frequency.
　上記の送信装置の他の一態様では、前記制御部は、前記第１の受信ユニット及び／又は前記第２の受信ユニットから受信した制御信号に基づき、前記第１の受信ユニットを伝送先とする出力部と、前記第２の受信ユニットを伝送先とする出力部とを決定する。この態様によっても、制御部は、出力部に対し、適切な伝送周波数に従ってコンテンツ信号を伝送するように制御することが可能となる。 In another aspect of the transmission apparatus, the control unit sets the first reception unit as a transmission destination based on a control signal received from the first reception unit and / or the second reception unit. An output unit and an output unit having the second receiving unit as a transmission destination are determined. Also according to this aspect, the control unit can control the output unit to transmit the content signal according to an appropriate transmission frequency.
　本発明の１つの観点では、送信装置と、少なくとも映像信号を出力するための第１の受信ユニットと、音声信号を出力するための第２の受信ユニットとを備え、デジタルインタフェースを通じて音声信号と映像信号とを含むコンテンツ信号を送受信するコンテンツ再生システムであって、前記送信装置は、音声信号と映像信号とを共に出力可能であり、前記第１の受信ユニットへ前記コンテンツ信号を送信する第１の出力部と、前記第１の出力部と同一規格であり、音声信号と映像信号とを共に出力可能であり、前記第２の受信ユニットへ前記コンテンツ信号を送信する第２の出力部と、各々が異なる伝送周波数で前記コンテンツ信号を同時に伝送するように前記複数の出力部を制御するとともに、前記第１の受信ユニットに音声信号の再生禁止指示を送信し、前記第２の受信ユニットに映像信号の再生禁止指示を送信する制御部と、を備え、前記第１及び第２の受信ユニットは、前記送信装置から前記コンテンツ信号及び前記再生禁止指示を受信する受信部と、前記コンテンツ信号に含まれる音声信号及び／又は映像信号を再生する再生部と、を備え、前記再生部の各々は、前記映像信号の再生禁止指示を受信したときに前記音声信号のみを再生し、前記音声信号の再生禁止指示を受信したときに前記映像信号のみを再生する。 In one aspect of the present invention, a transmission apparatus, a first reception unit for outputting at least a video signal, and a second reception unit for outputting an audio signal are provided. A content reproduction system for transmitting and receiving a content signal including a signal, wherein the transmission device can output both an audio signal and a video signal, and transmits the content signal to the first receiving unit. An output unit, and a second output unit that is the same standard as the first output unit, can output both an audio signal and a video signal, and transmits the content signal to the second receiving unit; Control the plurality of output units so that the content signals are transmitted simultaneously at different transmission frequencies, and the audio signal is retransmitted to the first receiving unit. A control unit that transmits a prohibition instruction and transmits a reproduction prohibition instruction of a video signal to the second reception unit, wherein the first and second reception units receive the content signal and the reproduction from the transmission device. A reception unit that receives a prohibition instruction; and a reproduction unit that reproduces an audio signal and / or a video signal included in the content signal, each of the reproduction units receiving a reproduction prohibition instruction for the video signal Only the audio signal is reproduced, and only the video signal is reproduced when an instruction to prohibit reproduction of the audio signal is received.
　上記のコンテンツ再生システムにおいて、第１の受信ユニットは映像再生を行い、第２の受信ユニットは音声再生を行う。 In the above content playback system, the first receiving unit performs video playback, and the second receiving unit performs audio playback.
　送信装置は、第１の出力部、第２の出力部、及び、制御部を備える。第１の出力部は、第１の受信ユニットへ音声信号と映像信号とを含むコンテンツ信号を送信する。第２の出力部は、第１の出力部と同一の伝送規格に基づきコンテンツ信号の伝送が可能であり、第１の出力部が送信したコンテンツ信号と伝送周波数を最適化した同一のコンテンツ信号を第２の受信ユニットへ送信する。ここで、「同一規格」とは、ケーブルと接続する端子（プラグ）の形状等に依らず、伝送方式（規格）が同一であることを指す。従って、ＨＤＭＩとＩＥＥＥ１３９４とは同一の規格ではない。一方、ＨＤＭＩは現段階の規格のバージョンではプラグ（又はコネクタ）のタイプによりＡタイプ、Ｂタイプ、Ｃタイプに分類されるが、ここではこれらは全て同一規格とする。また、第１の出力部と第２の出力部は、出力先であるインタフェースの種類には依存しない。即ち、第１又は第２の出力部から出力されるコンテンツ信号を、送信装置外へ伝送するためのインタフェースは、同一伝送規格でケーブルと接続可能な端子であってもよく、または無線通信が可能なアダプタであってもよい。 The transmission device includes a first output unit, a second output unit, and a control unit. The first output unit transmits a content signal including an audio signal and a video signal to the first receiving unit. The second output unit can transmit the content signal based on the same transmission standard as the first output unit, and the content signal transmitted by the first output unit and the same content signal optimized for the transmission frequency are transmitted. Transmit to the second receiving unit. Here, the “same standard” means that the transmission system (standard) is the same regardless of the shape of the terminal (plug) connected to the cable. Therefore, HDMI and IEEE 1394 are not the same standard. On the other hand, HDMI is classified into A type, B type, and C type according to the type of plug (or connector) in the version of the standard at the present stage. The first output unit and the second output unit do not depend on the type of interface that is the output destination. That is, the interface for transmitting the content signal output from the first or second output unit to the outside of the transmitting device may be a terminal that can be connected to a cable with the same transmission standard, or wireless communication is possible. A simple adapter may be used.
　制御部は、各々が異なる伝送周波数でコンテンツ信号を同時に伝送するように第１の出力部及び第２の出力部を制御する。また、制御部は、映像再生を行う第１の受信ユニットに対しては、コンテンツ信号を送信するとともに、音声信号の再生禁止指示を送信する。そして、音声再生を行う第２の受信ユニットに対しては、第１の受信ユニットとは異なる伝送周波数でコンテンツ信号を送信するとともに、映像信号の再生禁止指示を送信する。第１及び第２の受信ユニットは、受信した再生禁止指示に従ってコンテンツ信号を再生する。 The control unit controls the first output unit and the second output unit so that the content signals are simultaneously transmitted at different transmission frequencies. In addition, the control unit transmits a content signal and an audio signal reproduction prohibition instruction to the first receiving unit that performs video reproduction. Then, a content signal is transmitted at a transmission frequency different from that of the first reception unit, and a video signal reproduction prohibition instruction is transmitted to the second reception unit that performs audio reproduction. The first and second receiving units reproduce the content signal in accordance with the received reproduction prohibition instruction.
　このようにすることで、コンテンツ再生システムは、音声信号の伝送周波数及び映像信号の伝送周波数を、それぞれの伝送に適した伝送周波数に設定することができ、高周波伝送に起因するノイズを低減し、音質改善を図ることが可能となる。 By doing in this way, the content reproduction system can set the transmission frequency of the audio signal and the transmission frequency of the video signal to transmission frequencies suitable for each transmission, reduce noise caused by high-frequency transmission, Sound quality can be improved.
　好適には、第１及び第２の出力部が準拠する伝送規格はＨＤＭＩである。送信装置は、本発明を適用することにより、ＨＤＭＩの高周波伝送に起因するノイズを低減し、音質改善を図ることが可能となる。 Preferably, the transmission standard to which the first and second output units comply is HDMI. By applying the present invention, the transmission apparatus can reduce noise caused by high-frequency transmission of HDMI and improve sound quality.
　以下、図面を参照して本発明の好適な実施例について説明する。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
　［第１実施例］
　図１に、第１実施例における映像信号、音声信号、またはその両方を含む再生用信号（以後、「コンテンツ信号」と呼ぶ。）の再生システム（以後、「コンテンツ再生システム」と呼ぶ。）の概念図を示す。コンテンツ再生システムは、送信装置１００と、第１の受信装置２００と、第２の受信装置３００と、を有する。以下、これらが有する機能及び構成について説明する。 [First embodiment]
FIG. 1 shows a reproduction system (hereinafter referred to as “content reproduction system”) of a reproduction signal (hereinafter referred to as “content signal”) including a video signal, an audio signal, or both in the first embodiment. A conceptual diagram is shown. The content reproduction system includes a transmission device 100, a first reception device 200, and a second reception device 300. Hereinafter, functions and configurations of these will be described.
　送信装置１００は、受信装置２００及び３００へコンテンツ信号を送信する装置である。送信装置１００は、例えば、ＤＶＤプレーヤ、ブルーレイブレーヤ等が該当する。送信装置１００は、第１の受信装置２００と、映像信号と音声信号との同時伝送が可能なＨＤＭＩやＩＥＥＥ１３９４などのマルチメディアインタフェース規格に準拠したケーブルにより接続されている。同様に、送信装置１００は、第２の受信装置２００と、ＨＤＭＩ等に準拠したケーブルにより接続されている。以後、一例として、送信装置１００は、第１の受信装置２００及び第２の受信装置３００に対し、ＨＤＭＩに準拠した通信を行うものとする。送信装置１００は、制御部１０１と、デコード部１０２と、第１の出力部１０３と、第２の出力部１０４と、第１のインタフェース１３０と、第２のインタフェース１４０と、を有する。 The transmission device 100 is a device that transmits content signals to the reception devices 200 and 300. The transmission device 100 corresponds to, for example, a DVD player, a Blu-ray player, or the like. The transmission device 100 is connected to the first reception device 200 by a cable compliant with a multimedia interface standard such as HDMI or IEEE 1394 that can simultaneously transmit a video signal and an audio signal. Similarly, the transmission device 100 is connected to the second reception device 200 via a cable conforming to HDMI or the like. Hereinafter, as an example, it is assumed that the transmission device 100 performs communication based on HDMI to the first reception device 200 and the second reception device 300. The transmission apparatus 100 includes a control unit 101, a decoding unit 102, a first output unit 103, a second output unit 104, a first interface 130, and a second interface 140.
　制御部１０１は、図示しないＣＰＵ（Ｃｅｎｔｒａｌ　Ｐｒｏｃｅｓｓｉｎｇ　Ｕｎｉｔ）やＲＡＭ（Ｒａｎｄｏｍ　Ａｃｃｅｓｓ　Ｍｅｍｏｒｙ）、ＲＯＭ（Ｒｅａｄ　Ｏｎｌｙ　Ｍｅｍｏｒｙ）を有し、送信装置１００の全般的な制御を行う。制御部１０１は、第１の出力部１０３及び第２の出力部１０４に対し、コンテンツ信号を伝送する周波数（以後、「伝送周波数」と呼ぶ。）についての情報Ｓｄ（以後、「出力情報Ｓｄ」と呼ぶ。）を通知する。 The control unit 101 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), and a ROM (Read Only Memory) (not shown), and performs overall control of the transmission apparatus 100. The control unit 101 transmits information Sd (hereinafter, “output information Sd”) about the frequency (hereinafter referred to as “transmission frequency”) for transmitting the content signal to the first output unit 103 and the second output unit 104. Called).
　デコード部１０２は、コンテンツのデコードを行う。デコード部１０２は、例えば図示しないハードディスクなどの補助記憶部等により記憶されたコンテンツ、または、送信装置１００と電磁的に接続する他の機器（不図示）から送信されたコンテンツを読み込む。以後、コンテンツに含まれる音声信号を「音声信号Ｓａ」、映像信号を「映像信号Ｓｖ」と表記する。そして、デコード部１０２は、コンテンツをデコードして生成した映像信号Ｓｖ及び音声信号Ｓａをそれぞれ第１の出力部１０３及び第２の出力部１０４へ送信する。また、デコード部１０２は、制御部１０１に対し、例えば映像が１０８０ｐであるかなど、映像信号Ｓｖ及び音声信号Ｓａの仕様を通知する。ここで、「１０８０ｐ」は、１０８０本（総走査線１１２５本）、フレーム周波数５９．９４Ｈｚの順次走査（プログレッシブスキャン）方式の映像を表す。 The decoding unit 102 decodes the content. The decoding unit 102 reads content stored by an auxiliary storage unit such as a hard disk (not shown) or the like, or content transmitted from another device (not shown) that is electromagnetically connected to the transmission device 100. Hereinafter, the audio signal included in the content is referred to as “audio signal Sa”, and the video signal is referred to as “video signal Sv”. Then, the decoding unit 102 transmits the video signal Sv and the audio signal Sa generated by decoding the content to the first output unit 103 and the second output unit 104, respectively. Further, the decoding unit 102 notifies the control unit 101 of the specifications of the video signal Sv and the audio signal Sa, for example, whether the video is 1080p. Here, “1080p” represents a progressive scan video image with 1080 lines (1125 total scan lines) and a frame frequency of 59.94 Hz.
　第１の出力部１０３は、第１のインタフェース１３０を介して他の機器と通信を行うために必要な処理を実行する。第１実施例において、第１の出力部１０３は、デコード部１０２から受信した映像信号Ｓｖ及び音声信号Ｓａを所定の伝送周波数ｆ１（以後、「第１の伝送周波数ｆ１」と呼ぶ。）に従って第１の受信装置２００へ送信する。 The first output unit 103 performs processing necessary for communicating with other devices via the first interface 130. In the first embodiment, the first output unit 103 performs the video signal Sv and the audio signal Sa received from the decoding unit 102 in accordance with a predetermined transmission frequency f1 (hereinafter referred to as “first transmission frequency f1”). 1 to the first receiving device 200.
　第２の出力部１０４は、第２のインタフェース１４０を介して他の機器と通信を行うために必要な処理を実行する。第１実施例において、第２の出力部１０４は、デコード部１０２から受信した映像信号Ｓｖ及び音声信号Ｓａを所定の伝送周波数ｆ２（以後、「第２の伝送周波数ｆ２」と呼ぶ。）に従って第２の受信装置３００へ送信する。 The second output unit 104 executes processing necessary for communicating with other devices via the second interface 140. In the first embodiment, the second output unit 104 uses the video signal Sv and the audio signal Sa received from the decoding unit 102 in accordance with a predetermined transmission frequency f2 (hereinafter referred to as “second transmission frequency f2”). 2 to the receiving device 300.
　第１のインタフェース１３０及び第２のインタフェース１４０は、ＨＤＭＩ等の所定の規格に準拠したケーブルと接続可能なインタフェース（差し込み口）であり、コンテンツ信号の送受信、及びＥＤＩＤ（Ｅｘｔｅｎｄｅｄ　ｄｉｓｐｌａｙ　ｉｄｅｎｔｉｆｉｃａｔｉｏｎ　ｄａｔａ）やＣＥＣ（Ｃｏｎｓｕｍｅｒ　Ｅｌｅｃｔｒｏｎｉｃｓ　Ｃｏｎｔｒｏｌ）などの制御信号の送受信を行う。以後、第１のインタフェース１３０が通信する制御信号を「制御信号Ｃ１」、第２のインタフェース１４０が通信する制御信号を「制御信号Ｃ２」と呼ぶ。第１実施例において、第１のインタフェース１３０は、第１の受信装置２００のインタフェース２１０とＨＤＭＩに準拠したケーブルを介して電磁的に接続し、第２のインタフェース１４０は、第２の受信装置３００のインタフェース３１０とＨＤＭＩに準拠したケーブルを介して電磁的に接続している。 The first interface 130 and the second interface 140 are interfaces (plugs) that can be connected to a cable conforming to a predetermined standard such as HDMI, and transmit / receive content signals, EDID (Extended display identification data), and CEC. Control signals such as (Consumer Electronics Control) are transmitted and received. Hereinafter, the control signal communicated by the first interface 130 is referred to as “control signal C1”, and the control signal communicated by the second interface 140 is referred to as “control signal C2”. In the first embodiment, the first interface 130 is electromagnetically connected to the interface 210 of the first receiving device 200 via a cable compliant with HDMI, and the second interface 140 is connected to the second receiving device 300. The interface 310 is electromagnetically connected via an HDMI-compliant cable.
　第１の受信装置２００は、送信装置１００から映像信号Ｓｖ及び音声信号Ｓａを受信し映像信号Ｓｖの再生を行う。第１の受信装置２００は、入力部２０１と、映像出力部２０２と、インタフェース２１０を含む。第１の受信装置２００は、例えばプラズマテレビなどが該当する。 The first receiving device 200 receives the video signal Sv and the audio signal Sa from the transmitting device 100 and reproduces the video signal Sv. The first receiving device 200 includes an input unit 201, a video output unit 202, and an interface 210. The first receiving device 200 corresponds to, for example, a plasma television.
　入力部２０１は、送信装置１００から送信されたコンテンツ信号を、インタフェース２１０を介して受信する。そして、入力部２０１は、受信したコンテンツ信号のうち映像信号Ｓｖを映像出力部２０２へ供給する。映像出力部２０２は、ディスプレイなどが該当し、供給された映像信号Ｓｖに従って映像を表示する。なお、本実施例では、第１の受信装置２００は音声の出力能力を有するが、音声の出力を行わない。 The input unit 201 receives the content signal transmitted from the transmission device 100 via the interface 210. Then, the input unit 201 supplies the video signal Sv among the received content signals to the video output unit 202. The video output unit 202 corresponds to a display or the like, and displays a video according to the supplied video signal Sv. In the present embodiment, the first receiving device 200 has an audio output capability, but does not output audio.
　第２の受信装置３００は、送信装置１００から映像信号Ｓｖ及び音声信号Ｓａを受信し、音声信号Ｓａの再生を行う。第２の受信装置３００は、例えばＡＶレシーバなどが該当する。第２の受信装置３００は、入力部３０１とインタフェース３１０を有する。入力部３０１は、送信装置１００から送信されたコンテンツ信号を、インタフェース３１０を介して受信する。そして、入力部３０１は、受信したコンテンツ信号のうち音声信号Ｓａを音声出力装置３５０へ供給する。なお、本実施例では、第２の受信装置３００は映像の出力能力を有するが、映像の出力を行わない。 The second receiving device 300 receives the video signal Sv and the audio signal Sa from the transmitting device 100, and reproduces the audio signal Sa. The second receiving apparatus 300 corresponds to, for example, an AV receiver. The second receiving device 300 includes an input unit 301 and an interface 310. The input unit 301 receives the content signal transmitted from the transmission device 100 via the interface 310. Then, the input unit 301 supplies the audio signal Sa among the received content signals to the audio output device 350. In this embodiment, the second receiving device 300 has a video output capability, but does not output a video.
　音声出力装置３５０は、第２の受信装置３００から供給される音声信号Ｓａを受信し、その出力（再生）を行う。音声出力装置３５０は、例えばスピーカ等が該当する。 The audio output device 350 receives the audio signal Sa supplied from the second receiving device 300 and outputs (reproduces) the audio signal Sa. The sound output device 350 corresponds to, for example, a speaker.
　上記のコンテンツ再生システムの構成は一例であり、本発明が適用可能な構成はこれに限られない。例えば、第２の受信装置３００は、音声出力装置３５０を含む構成であってもよい。この場合、第２の受信装置３００及び音声出力装置３５０は、一台の装置で実現される。また、この場合、音声出力装置３５０は、例えば第２の受信装置３００内のバスを通じて音声信号Ｓａを入力部３０１から受信する。 The above-described configuration of the content reproduction system is an example, and the configuration to which the present invention can be applied is not limited thereto. For example, the second receiving device 300 may include an audio output device 350. In this case, the second receiving device 300 and the audio output device 350 are realized by a single device. In this case, the audio output device 350 receives the audio signal Sa from the input unit 301 through a bus in the second receiving device 300, for example.
　次に、コンテンツ再生システムにおけるコンテンツの再生方法について説明する。以後において、映像周波数「Ａｘ」（「ｘ」は正数。）は、各仕様の映像信号Ｓｖを伝送するために必要な最低の周波数（以後、「必要最低映像周波数」と呼ぶ。）を表す。また、Ａｘは、「ｘ」の数値が高い程、高周波数を表すものとする。同様に、音声周波数「ａｘ」は、送信装置１００が各仕様の音声信号Ｓａを伝送するために必要な最低の周波数（以後、「必要最低音声周波数」と呼ぶ。）を表す。ａｘは、「ｘ」の数値が高い程高周波数を表すものとする。 Next, a content playback method in the content playback system will be described. Hereinafter, the video frequency “Ax” (“x” is a positive number) represents the lowest frequency (hereinafter referred to as “required minimum video frequency”) necessary to transmit the video signal Sv of each specification. . Further, Ax represents a higher frequency as the value of “x” is higher. Similarly, the audio frequency “ax” represents the lowest frequency (hereinafter referred to as “required minimum audio frequency”) necessary for the transmitting apparatus 100 to transmit the audio signal Sa of each specification. It is assumed that ax represents a higher frequency as the value of “x” is higher.
　ＨＤＭＩによるコンテンツの伝送において、再生したいコンテンツのフォーマットによって、映像信号Ｓｖの伝送周波数を基準にして伝送する場合（以後、「映像優位ケース」と呼ぶ。）と、音声信号Ｓａの伝送周波数を基準にして伝送する場合（以後、「音声優位ケース」と呼ぶ。）と、が存在する。映像優位ケースでは、必要最低映像周波数Ａｘを伝送周波数とし、映像信号Ｓｖ及び音声信号Ｓａをその伝送周波数で伝送する。一方、音声優位ケースでは、必要最低音声周波数ａｘを伝送周波数とし、その伝送周波数で映像信号Ｓｖ及び音声信号Ｓａを送信する。 In the transmission of content by HDMI, depending on the format of the content to be reproduced, the transmission is based on the transmission frequency of the video signal Sv (hereinafter referred to as “video superior case”), and the transmission frequency of the audio signal Sa is used as a reference. (Hereinafter referred to as “voice superior case”). In the video superior case, the necessary minimum video frequency Ax is set as the transmission frequency, and the video signal Sv and the audio signal Sa are transmitted at the transmission frequency. On the other hand, in the audio superior case, the necessary minimum audio frequency ax is set as the transmission frequency, and the video signal Sv and the audio signal Sa are transmitted at the transmission frequency.
　さらに、ＨＤＭＩの規格上、映像優位ケース及び音声優位ケースのそれぞれにおいて、送信装置１００が使用する必要最低映像周波数と必要最低音声周波数との組は、予め決められている。ここでは、送信装置１００が使用可能な必要最低映像周波数と必要最低音声周波数との組を周波数組（Ａｘ、ａｘ）と表現する。映像優位ケースにおいて、必要最低映像周波数Ａｘは必要最低音声周波数ａｘ以上の値に設定され、音声優位ケースにおいて、必要最低映像周波数Ａｘは必要最低映像周波数ａｘ以下の値に設定される。 Further, in the HDMI standard, in each of the video superior case and the audio superior case, a set of a required minimum video frequency and a required minimum audio frequency used by the transmission apparatus 100 is determined in advance. Here, a set of a required minimum video frequency and a required minimum audio frequency that can be used by the transmission apparatus 100 is expressed as a frequency set (Ax, ax). In the video superior case, the necessary minimum video frequency Ax is set to a value equal to or higher than the necessary minimum audio frequency ax, and in the audio superior case, the necessary minimum video frequency Ax is set to a value equal to or lower than the necessary minimum video frequency ax.
　図１に示すコンテンツ再生システムのように、映像信号Ｓｖの出力と音声信号Ｓａの出力とを別の受信装置で行う場合、送信装置１００の制御部１０１は、一般的には第１の伝送周波数ｆ１と第２の伝送周波数ｆ２とを同一にすること（以後、「比較例」と呼ぶ。）が考えられる。しかし、一般に、映像信号Ｓｖを伝送するのに必要な伝送周波数と音声信号Ｓａを伝送するのに必要な伝送周波数とは異なる。従って、例えば映像優位ケースの場合、送信装置１００は、音声信号Ｓａを必要以上に高速な伝送周波数で送信することになる。よって、音声信号Ｓａを再生する受信装置３００は、必要以上に高い伝送周波数で音声信号Ｓａを受信するため、不要輻射などが原因でノイズの影響を強く受け、そのノイズが受信側の信号復元時に悪影響を及ぼし、その結果再生音質が劣化してしまうことがある。同様に、音声優位ケースの場合、送信装置１００は、映像信号Ｓｖを必要以上に高速な伝送周波数で送信することになる。よって、映像信号Ｓｖを再生する受信装置２００は、必要以上に高い伝送周波数で映像信号Ｓｖを受信するため、不要輻射などが原因でノイズの影響を強く受け、そのノイズが受信側の信号復元時に悪影響を及ぼし、その結果再生画質が劣化してしまうことがある。 When the output of the video signal Sv and the output of the audio signal Sa are performed by different receiving apparatuses as in the content reproduction system shown in FIG. 1, the control unit 101 of the transmitting apparatus 100 generally has a first transmission frequency. It is conceivable to make f1 and the second transmission frequency f2 the same (hereinafter referred to as “comparative example”). However, in general, the transmission frequency necessary for transmitting the video signal Sv is different from the transmission frequency necessary for transmitting the audio signal Sa. Therefore, for example, in the case of a video superior case, the transmission device 100 transmits the audio signal Sa at a transmission frequency that is faster than necessary. Therefore, since the receiving apparatus 300 that reproduces the audio signal Sa receives the audio signal Sa at a transmission frequency higher than necessary, the receiving apparatus 300 is strongly influenced by noise due to unnecessary radiation and the like, and the noise is generated when the signal on the receiving side is restored. It may adversely affect the playback sound quality. Similarly, in the case of audio superiority, the transmission device 100 transmits the video signal Sv at a transmission frequency that is faster than necessary. Therefore, since the receiving device 200 that reproduces the video signal Sv receives the video signal Sv at a transmission frequency higher than necessary, the receiving device 200 is strongly affected by noise due to unnecessary radiation and the like, and the noise is generated when the signal on the receiving side is restored. It may adversely affect the playback image quality.
　そこで、第１実施例において、制御部１０１は、第１の出力部１０３と第２の出力部１０４とに対し、それぞれ異なる伝送周波数によりコンテンツ信号を出力するように制御する。即ち、制御部１０１は、第１の受信装置２００と第２の受信装置３００が音声を再生するか、または映像を再生するかに従って、第１の伝送周波数ｆ１と第２の伝送周波数ｆ２とをそれぞれ必要最低限の周波数に設定する。これについて以下詳細を述べる。 Therefore, in the first embodiment, the control unit 101 controls the first output unit 103 and the second output unit 104 to output content signals at different transmission frequencies. That is, the control unit 101 sets the first transmission frequency f1 and the second transmission frequency f2 according to whether the first reception device 200 and the second reception device 300 reproduce audio or video. Set each to the minimum frequency required. This will be described in detail below.
　制御部１０１は、第１の出力部１０３に対し、必要最低映像周波数または必要最低音声周波数のいずれに基づき映像信号Ｓｖ及び音声信号Ｓａを出力（伝送）するかを示す情報Ｓｄ（以後、「出力情報Ｓｄ」）を送信する。第１実施例において、第１の出力部１０３は、映像を再生する第１の受信装置２００と接続している。従って、制御部１０１は、第１の出力部１０３に対し、必要最低映像周波数に基づき第１の伝送周波数ｆ１を決定する旨の出力情報Ｓｄを送信する。または、制御部１０１は、第１の出力部１０３に対し、必要最低映像周波数に基づき決定した第１の伝送周波数ｆ１を出力情報Ｓｄとして送信する。このようにすることで、送信装置１００は、音声優位ケースにおいても、映像信号Ｓｖを、その映像信号Ｓｖを送信するために必要な最低限の伝送周波数により第１の受信装置２００へ送信することができる。従って、送信装置１００は、必要以上に高い伝送周波数で映像信号Ｓｖを伝送することに起因して映像信号Ｓｖに発生するノイズの影響を低減することができる。 The control unit 101 provides the first output unit 103 with information Sd (hereinafter referred to as “output”) indicating whether to output (transmit) the video signal Sv and the audio signal Sa based on the minimum required video frequency or the minimum required audio frequency. Information Sd "). In the first embodiment, the first output unit 103 is connected to the first receiving device 200 that reproduces video. Therefore, the control unit 101 transmits output information Sd indicating that the first transmission frequency f1 is determined based on the necessary minimum video frequency to the first output unit 103. Alternatively, the control unit 101 transmits to the first output unit 103 the first transmission frequency f1 determined based on the necessary minimum video frequency as output information Sd. By doing in this way, the transmitting apparatus 100 transmits the video signal Sv to the first receiving apparatus 200 at the minimum transmission frequency necessary for transmitting the video signal Sv even in the audio superior case. Can do. Therefore, the transmission device 100 can reduce the influence of noise generated in the video signal Sv due to the transmission of the video signal Sv at a transmission frequency higher than necessary.
　なお、前述のように、第１の受信装置２００は音声を出力しないにも拘わらず、音声信号Ｓａを受信することになる。よって、第１の受信装置２００は、受信した音声信号Ｓａを再生しないように制御される必要がある。この１つの方法としては、ユーザが第１の受信装置２００を操作し、音声の出力を停止すればよい。また、他の方法として、送信装置１００は、第１の受信装置２００に対して、音声の出力を停止する指示を含む制御信号Ｃ１を与えるようにしてもよい。また、さらに他の方法として、第１の受信装置１００は、第１の出力部１０３により伝送する音声信号Ｓａを無音信号に置き換えることとしてもよい。これらのいずれかにより、送信装置１００は、第１の受信装置２００が音声も再生可能である場合に音声の出力を停止することができる。 As described above, the first receiving device 200 receives the audio signal Sa even though it does not output audio. Therefore, the first receiving apparatus 200 needs to be controlled so as not to reproduce the received audio signal Sa. As this one method, the user may operate the first receiving device 200 and stop outputting the sound. As another method, the transmission apparatus 100 may give the first reception apparatus 200 a control signal C1 including an instruction to stop outputting audio. As yet another method, the first receiving device 100 may replace the audio signal Sa transmitted by the first output unit 103 with a silence signal. By any of these, the transmission apparatus 100 can stop outputting the sound when the first receiving apparatus 200 can also reproduce the sound.
　同様に、制御部１０１は、第２の出力部１０４に対し、必要最低音声周波数に基づき第２の伝送周波数ｆ２を決定する旨の出力情報Ｓｄを送信する。または、制御部１０１は、第２の出力部１０４に対し、必要最低音声周波数に基づき決定した第２の伝送周波数ｆ２を出力情報Ｓｄとして送信する。このようにすることで、送信装置１００は、映像優位ケースにおいても、音声信号Ｓａを、その音声信号Ｓａを送信するために必要な最低限の伝送周波数により第２の受信装置３００へ送信することができる。従って、送信装置１００は、必要以上に高い伝送周波数で音声信号Ｓａを伝送することに起因して音声信号Ｓａに発生するノイズの影響を低減することができる。 Similarly, the control unit 101 transmits output information Sd to the second output unit 104 to determine the second transmission frequency f2 based on the necessary minimum audio frequency. Alternatively, the control unit 101 transmits, as output information Sd, the second transmission frequency f2 determined based on the necessary minimum audio frequency to the second output unit 104. By doing in this way, the transmitting apparatus 100 transmits the audio signal Sa to the second receiving apparatus 300 at the minimum transmission frequency necessary for transmitting the audio signal Sa even in the video superior case. Can do. Therefore, the transmission device 100 can reduce the influence of noise generated in the audio signal Sa due to the transmission of the audio signal Sa at a transmission frequency higher than necessary.
　なお、前述のように、第２の受信装置３００は映像を出力しないにも拘わらず、映像信号Ｓｖを受信することになる。よって、第２の受信装置３００は、受信した映像信号Ｓｖを再生しないように制御される必要がある。この１つの方法としては、ユーザが第２の受信装置３００を操作し、映像の出力を停止してもよい。また、他の方法として、送信装置１００は、第２の受信装置３００に対して、映像の出力を停止する指示を含む制御信号Ｃ２を与えるようにしてもよい。また、さらに他の方法として、第１の受信装置１００は、第２の出力部１０３により伝送する映像信号Ｓｖを黒などの単一色の画面を示す映像信号（以後、「黒マスク信号」と呼ぶ。）に置き換えることとしてもよい。これにより、送信装置１００は、第２の受信装置３００が映像も再生可能である場合に映像の出力を停止することができる。 As described above, the second receiving device 300 receives the video signal Sv even though it does not output the video. Therefore, the second receiving device 300 needs to be controlled so as not to reproduce the received video signal Sv. As one method, the user may operate the second receiving device 300 to stop the output of the video. As another method, the transmission device 100 may give the second reception device 300 a control signal C2 including an instruction to stop video output. As yet another method, the first receiving apparatus 100 uses the video signal Sv transmitted by the second output unit 103 as a video signal indicating a single color screen such as black (hereinafter referred to as “black mask signal”). .). Accordingly, the transmission device 100 can stop the output of the video when the second reception device 300 can also reproduce the video.
　次に、制御部１０１が第１の出力部１０３及び第２の出力部１０４に与える出力情報Ｓｄについて説明する。１つの方法では、制御部１０１は、出力情報Ｓｄを、ユーザからの入力により決定する。具体的には、制御部１０１は、ユーザから、第１の受信装置２００により映像を再生しかつ第２の受信装置３００により音声を再生する旨の入力を受け、その入力に基づき、第１の出力部１０３及び第２の出力部１０４に対し、出力情報Ｓｄを通知する。この場合、送信装置１００は、図示しないボタンやタッチパネルなどの入力部を外面上に別途具備し、ユーザからの入力を可能にする。 Next, output information Sd that the control unit 101 gives to the first output unit 103 and the second output unit 104 will be described. In one method, the control unit 101 determines the output information Sd by input from the user. Specifically, the control unit 101 receives an input from the user that the first receiving device 200 reproduces the video and the second receiving device 300 reproduces the audio. Output information Sd is notified to the output unit 103 and the second output unit 104. In this case, the transmission device 100 separately includes an input unit such as a button or a touch panel (not shown) on the outer surface, and enables input from the user.
　他の方法では、制御部１０１は、第１の受信装置２００から送信された制御信号Ｃ１及び第２の受信装置３００から送信された制御信号Ｃ２に基づき出力情報Ｓｄを決定してもよい。この場合、送信装置１００は、例えばＣＥＣチャネルにより、第１の受信装置２００及び第２の受信装置３００に対し、それらが音声再生専用機器であるか、または映像再生専用機器であるかについての情報を取得する。そして、音声再生専用機器に対しては必要最低音声周波数に基づいて伝送周波数を決定し、映像再生専用機器に対しては必要最低映像周波数に基づいて伝送周波数を決定する。 In another method, the control unit 101 may determine the output information Sd based on the control signal C1 transmitted from the first receiving device 200 and the control signal C2 transmitted from the second receiving device 300. In this case, the transmission apparatus 100 uses the CEC channel, for example, to the first reception apparatus 200 and the second reception apparatus 300 as to whether or not they are audio reproduction dedicated devices or video reproduction dedicated devices. To get. Then, the transmission frequency is determined based on the necessary minimum audio frequency for the audio reproduction dedicated device, and the transmission frequency is determined based on the necessary minimum video frequency for the video reproduction dedicated device.
　次に、伝送周波数、必要最低映像周波数及び必要最低音声周波数の具体例について説明する。図２は、映像優位ケースにおける、伝送周波数と、必要最低映像周波数と、必要最低音声周波数との関係を示す表の一例である。表中の「出力１」は、第１のインタフェース１３０における出力を表し、「出力２」は、第２のインタフェース１４０における出力を表す。即ち、出力１の伝送周波数は、第１の伝送周波数ｆ１を示し、出力２の伝送周波数は、第２の伝送周波数ｆ２を示す。 Next, specific examples of transmission frequency, minimum required video frequency, and minimum required audio frequency will be described. FIG. 2 is an example of a table showing the relationship among the transmission frequency, the required minimum video frequency, and the required minimum audio frequency in the video superior case. “Output 1” in the table represents an output at the first interface 130, and “Output 2” represents an output at the second interface 140. That is, the transmission frequency of output 1 indicates the first transmission frequency f1, and the transmission frequency of output 2 indicates the second transmission frequency f2.
　図２（ａ）は、映像優位ケースにおいて、ユーザが周波数組（Ａ１、ａ３）による視聴を希望した場合、即ち再生させたいフォーマットに対し音声必要周波数ではなく映像必要周波数が伝送周波数の決定において支配的となる場合における、第１実施例及び比較例にそれぞれ対応する表を示す。図２（ａ）に示すように、比較例においては、第１の伝送周波数ｆ１と第２の伝送周波数ｆ２とが同一であるため、出力２における伝送周波数は、本来音声信号Ｓａを伝送するのに必要な周波数よりも大きい。即ち、音声信号Ｓａを送信するための必要最低周波数はａ１であるが、伝送周波数を必要最低映像周波数に合わせているため、出力２は必要以上に高い伝送周波数で音声信号Ｓａを伝送することになる。 FIG. 2 (a) shows that in the video superior case, when the user desires to view by the frequency set (A1, a3), that is, the required video frequency, not the required audio frequency, determines the transmission frequency for the format to be reproduced. Tables corresponding respectively to the first example and the comparative example in the case of the target are shown. As shown in FIG. 2A, in the comparative example, since the first transmission frequency f1 and the second transmission frequency f2 are the same, the transmission frequency at the output 2 originally transmits the audio signal Sa. Is greater than the frequency required. That is, the necessary minimum frequency for transmitting the audio signal Sa is a1, but since the transmission frequency is adjusted to the necessary minimum video frequency, the output 2 transmits the audio signal Sa at a transmission frequency higher than necessary. Become.
　これに対し、第１実施例においては、送信装置１００は、第１の伝送周波数ｆ１及び第２の伝送周波数ｆ２を、それぞれの出力先の受信装置が再生する内容、即ち、音声を再生するかまたは映像を再生するかに応じて設定する。したがって、送信装置１００は、必要最低音声周波数ａ３に対応する必要最低映像周波数Ａ３を出力２の伝送周波数に設定し、映像信号Ｓｖ及び音声信号Ｓａを第２の受信装置３００へ送信する。これにより、送信装置１００は、第２の伝送周波数ｆ２を、音声信号Ｓａを送信するために必要な最低の周波数に抑えることができ、第２の受信装置３００において音声信号Ｓａに発生するノイズを低減することができる。 On the other hand, in the first embodiment, the transmitting apparatus 100 reproduces the contents that the respective output destination receiving apparatuses reproduce the first transmission frequency f1 and the second transmission frequency f2, that is, the audio. Or set according to whether to play the video. Therefore, the transmitting apparatus 100 sets the necessary minimum video frequency A3 corresponding to the necessary minimum audio frequency a3 to the transmission frequency of output 2, and transmits the video signal Sv and the audio signal Sa to the second receiving apparatus 300. Thereby, the transmission device 100 can suppress the second transmission frequency f2 to the lowest frequency necessary for transmitting the audio signal Sa, and noise generated in the audio signal Sa in the second reception device 300 can be reduced. Can be reduced.
　なおこの場合、前述のように、送信装置１００は、第２の受信装置３００へ送信する映像信号Ｓｖを黒マスク信号に置き換えてもよい。または、第２の受信装置３００が、受信した映像信号Ｓｖを破棄し、または黒等の単一色の表示に切り替えてもよい。これにより、第２の受信装置３００は映像を表示しないように制御される。 In this case, as described above, the transmission device 100 may replace the video signal Sv transmitted to the second reception device 300 with a black mask signal. Alternatively, the second receiving device 300 may discard the received video signal Sv or switch to a single color display such as black. Thereby, the second receiving device 300 is controlled not to display an image.
　同様に、送信装置１００は、第１の受信装置２００へ送信する音声信号Ｓａを無音信号に置き換えてもよい。または、第１の受信装置２００が、音声信号Ｓａを破棄し、またはミュートしてもよい。これにより、第１の受信装置２００は音声を出力しないように制御される。 Similarly, the transmission device 100 may replace the audio signal Sa transmitted to the first reception device 200 with a silence signal. Alternatively, the first receiving device 200 may discard or mute the audio signal Sa. Thereby, the first receiving device 200 is controlled not to output sound.
　図２（ｂ）は、映像優位ケースにおいて、ユーザが映像を１０８０ｐ、音声を２ＣＨ　ＬＰＣＭの品質（仕様）としてコンテンツ視聴を希望した場合の伝送周波数と必要最低映像周波数と必要最低音声周波数との関係を示す表である。即ち、図２（ｂ）は、図２（ａ）において、必要最低映像周波数Ａ１を１４８．５ＭＨｚ、最低音声周波数ａ３に対応する必要最低伝送周波数Ａ３を２７ＭＨｚ、必要最低音声周波数ａ３を２７ＭＨｚと置き換えた表である。図２（ｂ）に示すように、比較例において、送信装置１００は、出力１の伝送周波数及び出力２の伝送周波数を、１４８．５ＭＨｚにしてコンテンツ信号の送信を行う。一方、第１実施例において、送信装置１００は、出力１の伝送周波数を１４８．５ＭＨｚ、出力２の伝送周波数を２７ＭＨｚにしている。これにより、送信装置１００は、音声信号Ｓａの高速伝送に起因するノイズの影響を低減することができる。 FIG. 2 (b) shows the relationship between the transmission frequency, the required minimum video frequency, and the required minimum audio frequency when the user wants to view content with 1080p video and audio 2CH LPCM quality (specification) in the video superior case. It is a table | surface which shows. That is, FIG. 2B replaces the required minimum video frequency A1 with 148.5 MHz, the required minimum transmission frequency A3 corresponding to the minimum audio frequency a3 with 27 MHz, and the required minimum audio frequency a3 with 27 MHz in FIG. It is a table. As shown in FIG. 2B, in the comparative example, the transmission device 100 transmits the content signal by setting the transmission frequency of the output 1 and the transmission frequency of the output 2 to 148.5 MHz. On the other hand, in the first embodiment, the transmission device 100 sets the transmission frequency of output 1 to 148.5 MHz and the transmission frequency of output 2 to 27 MHz. Thereby, the transmission apparatus 100 can reduce the influence of noise resulting from the high-speed transmission of the audio signal Sa.
　図３は、音声優位ケースにおける、伝送周波数と、必要最低映像周波数と、必要最低音声周波数との関係を示す表の一例である。図３（ａ）は、音声優位ケースにおいて、ユーザが周波数組（Ａ３、ａ１）による視聴を希望した場合、即ち、再生させたいフォーマットに対し映像必要周波数ではなく音声必要周波数の方が伝送周波数の決定において支配的となる場合における第１実施例及び比較例に対応する表を示す。映像優位ケースと同様、比較例においては、出力１の伝送周波数と出力２の伝送周波数とが同一であるため、出力１における伝送周波数は、本来映像信号Ｓｖを伝送するのに必要な最低の周波数よりも大きい。一方、第１実施例において、送信装置１００は、映像周波数Ａ３を出力１の伝送周波数に設定し、映像信号Ｓｖ及び音声信号Ｓａを送信する。これにより、送信装置１００は、出力１における伝送周波数を必要最小限に抑えることができ、高周波伝送に起因した映像信号Ｓｖのノイズ発生を低減することができる。 FIG. 3 is an example of a table showing the relationship among the transmission frequency, the required minimum video frequency, and the required minimum audio frequency in the audio superior case. FIG. 3A shows a case where the user desires to view the frequency set (A3, a1) in the audio superior case, that is, the audio frequency is not the video frequency but the transmission frequency is higher than the video frequency for the format to be reproduced. The table | surface corresponding to the 1st Example and comparative example in the case where it becomes dominant in determination is shown. As in the video superior case, in the comparative example, the transmission frequency of output 1 and the transmission frequency of output 2 are the same, so the transmission frequency at output 1 is the lowest frequency that is originally necessary for transmitting the video signal Sv. Bigger than. On the other hand, in the first embodiment, the transmission device 100 sets the video frequency A3 to the transmission frequency of output 1, and transmits the video signal Sv and the audio signal Sa. Thereby, the transmission apparatus 100 can suppress the transmission frequency at the output 1 to a necessary minimum, and can reduce the occurrence of noise in the video signal Sv due to the high-frequency transmission.
　なおこの場合、前述のように送信装置１００は、第１の受信装置２００へ伝送される音声信号Ｓａを無音信号に置き換えてもよい。または、第１の受信装置２００は、音声信号Ｓａを破棄し、またはミュート設定にしてもよい。これにより、第１の受信装置２００は、音声を出力しないように制御される。 In this case, as described above, the transmission device 100 may replace the audio signal Sa transmitted to the first reception device 200 with a silence signal. Alternatively, the first receiving device 200 may discard the audio signal Sa or set it to mute. Thereby, the first receiving device 200 is controlled not to output sound.
　同様に、送信装置１００は、第２の受信装置３００へ伝送される映像信号Ｓｖを黒マスク信号に置き換えてもよい。または、第２の受信装置３００は、映像信号Ｓｖを破棄し、または黒等の単一色の表示に切り替えてもよい。これにより、第２の受信装置３００は映像を表示しないように制御される。 Similarly, the transmission device 100 may replace the video signal Sv transmitted to the second reception device 300 with a black mask signal. Alternatively, the second receiving device 300 may discard the video signal Sv or switch to a single color display such as black. Thereby, the second receiving device 300 is controlled not to display an image.
　図３（ｂ）は、ユーザが映像を４８０ｉ、音声をＤＴＳ－ＨＤ　Ｍａｓｔｅｒ　Ａｕｄｉｏの品質によりコンテンツ視聴を希望した場合の伝送周波数と、必要最低映像周波数と、必要最低音声周波数との関係を示す表の一例である。即ち、図３（ｂ）は、図３（ａ）において、音声必要周波数がａ３のときの必要最低伝送周波数Ａ３を２７ＭＨｚ、音声必要周波数がａ１のときの必要最低伝送周波数Ａ１を５４ＭＨｚ、必要最低音声周波数ａ３を２７ＭＨｚと置き換えた表である。ここで、「４８０ｉ」は、有効走査線４８０本（総走査線５２５本）、フレーム周波数２９．９７Ｈｚの飛び越し走査（インターレーススキャン）方式の映像を表す。図３（ｂ）に示すように、比較例において、送信装置１００は、出力１の伝送周波数及び出力２の伝送周波数を、５４ＭＨｚにしてコンテンツ信号の送信を行う。一方、第１実施例において、送信装置１００は、出力１の伝送周波数を２７ＭＨｚ、出力２の伝送周波数を５４ＭＨｚにしている。即ち、第１実施例において、送信装置１００は、第１の受信装置２００への伝送周波数を、映像信号Ｓｖを送信するために必要な最低の周波数に設定している。これにより、送信装置１００は、高速伝送に起因した映像信号Ｓｖのノイズの影響を低減することができる。 FIG. 3B is a table showing the relationship between the transmission frequency, the required minimum video frequency, and the required minimum audio frequency when the user desires to view the content according to the quality of video 480i and audio DTS-HD Master Audio. It is an example. That is, FIG. 3B is the same as FIG. 3A, in which the required minimum transmission frequency A3 is 27 MHz when the required voice frequency is a3, the required minimum transmission frequency A1 is 54 MHz when the required voice frequency is a1, and the required minimum. It is the table | surface which replaced audio | voice frequency a3 with 27 MHz. Here, “480i” represents an image of an interlaced scanning method with 480 effective scanning lines (total scanning line 525) and a frame frequency of 29.97 Hz. As shown in FIG. 3B, in the comparative example, the transmission device 100 transmits the content signal with the transmission frequency of output 1 and the transmission frequency of output 2 set to 54 MHz. On the other hand, in the first embodiment, the transmission device 100 sets the transmission frequency of output 1 to 27 MHz and the transmission frequency of output 2 to 54 MHz. That is, in the first embodiment, the transmission device 100 sets the transmission frequency to the first reception device 200 to the lowest frequency necessary for transmitting the video signal Sv. Thereby, the transmission apparatus 100 can reduce the influence of noise of the video signal Sv due to high-speed transmission.
　［第２実施例］
　第１実施例に係るコンテンツ再生システムは、第１の受信装置２００と第２の受信装置３００とがそれぞれ送信装置１００からコンテンツ信号を受信していた。しかし、本発明が適用可能なコンテンツ再生システムの形態はこれに限られず、コンテンツ信号を１台の受信装置で受信する形態も考えられる。図４は、第２実施例に係るコンテンツ再生システムの構成を示す。図４に示すように、第２実施例において、コンテンツ再生システムは、送信装置１００と、受信装置４００と、を含む。 [Second Embodiment]
In the content reproduction system according to the first example, the first receiving device 200 and the second receiving device 300 each receive a content signal from the transmitting device 100. However, the form of the content reproduction system to which the present invention can be applied is not limited to this, and a form in which the content signal is received by one receiving apparatus is also conceivable. FIG. 4 shows a configuration of a content reproduction system according to the second embodiment. As shown in FIG. 4, in the second embodiment, the content reproduction system includes a transmission device 100 and a reception device 400.
　受信装置４００は、第１の入力部４０１と、第２の入力部４０２と、インタフェース４１０と、インタフェース４２０と、映像出力部４０３と、音声出力部４０４と、を含む。 The receiving device 400 includes a first input unit 401, a second input unit 402, an interface 410, an interface 420, a video output unit 403, and an audio output unit 404.
　第１の入力部４０１は、送信装置１００の第１のインタフェース１３０から伝送された映像信号Ｓｖ及び音声信号Ｓａを、インタフェース４１０を介して受信する。さらに、第１の入力部４０１は、受信した信号のうち、音声信号Ｓａを廃棄し、映像信号Ｓｖを映像出力部４０３へ供給する。映像出力部４０３は、供給された映像信号Ｓｖに基づき映像を表示する。 The first input unit 401 receives the video signal Sv and the audio signal Sa transmitted from the first interface 130 of the transmission device 100 via the interface 410. Further, the first input unit 401 discards the audio signal Sa among the received signals and supplies the video signal Sv to the video output unit 403. The video output unit 403 displays a video based on the supplied video signal Sv.
　第２の入力部４０２は、送信装置１００の第２のインタフェース１４０から伝送された映像信号Ｓｖ及び音声信号Ｓａを、インタフェース４２０を介して受信する。さらに、第２の入力部４０２は、受信した信号のうち、映像信号Ｓｖを廃棄し、音声信号Ｓａを音声出力部４０４へ供給する。音声出力部４０４は、供給された音声信号Ｓａに基づき音声を出力する。なお、図４において、音声出力部４０４は、受信装置４００内に配置されているが、受信装置４００とは別の装置（別体）であってもよい。この場合、受信装置４００と音声出力部４０３とは、ケーブル等を介して電磁的に接続する。 The second input unit 402 receives the video signal Sv and the audio signal Sa transmitted from the second interface 140 of the transmission device 100 via the interface 420. Further, the second input unit 402 discards the video signal Sv among the received signals and supplies the audio signal Sa to the audio output unit 404. The audio output unit 404 outputs audio based on the supplied audio signal Sa. In FIG. 4, the audio output unit 404 is arranged in the reception device 400, but may be a device (separate body) different from the reception device 400. In this case, the receiving device 400 and the audio output unit 403 are electromagnetically connected via a cable or the like.
　インタフェース４１０を介して受信された映像信号Ｓｖ及び音声信号Ｓａは、映像周波数に基づき伝送されている。即ち、第１の伝送周波数ｆ１は、必要最低映像周波数に基づき決定されている。従って、この映像信号Ｓｖは、音声優位ケースにおいて音声周波数が高周波数であっても、伝送周波数に起因するノイズの影響は受けない。同様に、インタフェース４２０を介して受信された映像信号Ｓｖ及び音声信号Ｓａは、必要最低音声周波数に基づき伝送されている。即ち、第２の伝送周波数ｆ２は、必要最低音声周波数に基づき決定されている。従って、この音声信号Ｓａは、映像優位ケースにおいて映像周波数が高周波数であっても、伝送周波数に起因するノイズの影響を受けない。従って、受信装置４００は、インタフェース４１０を介して受信した映像信号Ｓｖを映像出力部４０３へ供給し、インタフェース４２０を介して受信した音声信号Ｓａを音声出力部４０４へ供給することで、映像優位ケースであっても、高速伝送に起因する音声信号Ｓａのノイズの影響を低減することができる。そして、受信装置４００は、音声優位ケースであっても、高速伝送に起因する映像信号Ｓｖのノイズの影響を低減することができる。 The video signal Sv and the audio signal Sa received via the interface 410 are transmitted based on the video frequency. That is, the first transmission frequency f1 is determined based on the necessary minimum video frequency. Therefore, the video signal Sv is not affected by noise caused by the transmission frequency even if the audio frequency is high in the audio dominant case. Similarly, the video signal Sv and the audio signal Sa received via the interface 420 are transmitted based on the necessary minimum audio frequency. That is, the second transmission frequency f2 is determined based on the necessary minimum audio frequency. Therefore, the audio signal Sa is not affected by noise caused by the transmission frequency even if the video frequency is high in the video dominant case. Therefore, the receiving apparatus 400 supplies the video signal Sv received via the interface 410 to the video output unit 403 and supplies the audio signal Sa received via the interface 420 to the audio output unit 404, thereby providing a video superior case. Even so, it is possible to reduce the influence of noise of the audio signal Sa caused by high-speed transmission. The receiving apparatus 400 can reduce the influence of the noise of the video signal Sv resulting from the high-speed transmission even in the audio superior case.
　以上のように、本実施例に係る送信装置は、ＨＤＭＩなどに準拠したケーブル等を介して第１の受信装置及び第２の受信装置と接続し、第１及び第２のインタフェースと、第１及び第２の出力部と、制御部と、を有する。第１の出力部は、第１の伝送周波数に従って、第１のインタフェースにコンテンツを供給する。第２の出力部は、第２の伝送周波数に従って、第２のインタフェースにコンテンツを供給する。制御部は、必要最低音声周波数と必要最低映像周波数とのいずれに基づき第１及び第２の伝送周波数を決定すべきかを示す出力情報を第１及び第２の出力部に通知する。このようにすることで、送信装置は、高品質な映像を送信する場合であっても、音声信号を送信するための伝送周波数を抑えることができる。従って、送信装置は、高周波伝送に起因するノイズを低減し、音質改善を図ることが可能となる。また、送信装置は、高品質な音声を送信する場合であっても、映像信号を送信するための伝送周波数を抑えることができる。従って、送信装置は、高周波伝送に起因するノイズを低減し、画質改善を図ることが可能となる。 As described above, the transmitting apparatus according to the present embodiment is connected to the first receiving apparatus and the second receiving apparatus via a cable or the like conforming to HDMI, and the first and second interfaces, And a second output unit and a control unit. The first output unit supplies content to the first interface according to the first transmission frequency. The second output unit supplies the content to the second interface according to the second transmission frequency. The control unit notifies the first and second output units of output information indicating whether the first and second transmission frequencies should be determined based on the minimum required audio frequency or the minimum required video frequency. In this way, the transmission device can suppress the transmission frequency for transmitting the audio signal even when transmitting a high-quality video. Therefore, the transmission apparatus can reduce noise caused by high-frequency transmission and improve sound quality. Further, the transmission device can suppress the transmission frequency for transmitting the video signal even when transmitting high-quality audio. Therefore, the transmission device can reduce noise caused by high-frequency transmission and improve image quality.
　［変形例］
　上述の第１実施例及び第２実施例において、コンテンツ再生システムは、音声信号を伝送し再生する系統（ライン）と、映像信号を伝送し再生する系統との２系統を有していた。しかし、本発明が適用可能な構成はこれに限定されない。例えば、コンテンツ再生システムは、３系統以上含む構成（以後、「変形例に係るコンテンツ再生システム」と呼ぶ。）であってもよい。この場合、変形例に係るコンテンツ再生システムは、少なくとも、音声信号を伝送し再生する系統と、映像信号を伝送し再生する系統と、を有する。そして、変形例に係るコンテンツ再生システムにおいて、例えば、送信装置１００が第１の出力部１０３及び第２の出力部１０４の他に、コンテンツ信号を送信する第３の出力部を有し、第３の受信装置が第３の出力部によって出力されたコンテンツ信号を受信し、その映像信号または音声信号を再生する。 [Modification]
In the first and second embodiments described above, the content playback system has two systems, a system (line) for transmitting and reproducing audio signals and a system for transmitting and reproducing video signals. However, the configuration to which the present invention is applicable is not limited to this. For example, the content reproduction system may have a configuration including three or more systems (hereinafter referred to as “content reproduction system according to a modification”). In this case, the content reproduction system according to the modification has at least a system for transmitting and reproducing an audio signal and a system for transmitting and reproducing a video signal. In the content reproduction system according to the modified example, for example, the transmission device 100 includes a third output unit that transmits a content signal in addition to the first output unit 103 and the second output unit 104, and includes a third output unit. The receiving apparatus receives the content signal output by the third output unit, and reproduces the video signal or the audio signal.
　本発明は、多装置間でコンテンツを伝送し再生するコンテンツ再生システムに利用することができる。 The present invention can be used in a content reproduction system that transmits and reproduces content between multiple devices.

Claims (7)

  1. 　デジタルインタフェースを通じて、音声信号と映像信号とを含むコンテンツ信号を、少なくとも映像信号を出力するための第１の受信ユニットと音声信号を出力するための第２の受信ユニットへ伝送する送信装置であって、
    　音声信号と映像信号とを共に出力可能であり、前記第１の受信ユニットへ前記コンテンツ信号を送信する第１の出力部と、
    　前記第１の出力部と同一規格であり、音声信号と映像信号とを共に出力可能であり、前記第２の受信ユニットへ前記コンテンツ信号を送信する第２の出力部と、
    　第１の出力部から送信される信号と第２の出力部から送信される信号を夫々異なる伝送周波数で同時に伝送するように前記複数の出力部を制御する制御部と、
    を備えることを特徴とする送信装置。     A transmission device for transmitting a content signal including an audio signal and a video signal to at least a first reception unit for outputting a video signal and a second reception unit for outputting an audio signal through a digital interface. ,
    A first output unit capable of outputting both an audio signal and a video signal, and transmitting the content signal to the first receiving unit;
    A second output unit that is the same standard as the first output unit, can output both an audio signal and a video signal, and transmits the content signal to the second reception unit;
    A control unit that controls the plurality of output units so that a signal transmitted from the first output unit and a signal transmitted from the second output unit are simultaneously transmitted at different transmission frequencies;
    A transmission device comprising:
  2. 　前記制御部は、前記第１の受信ユニットを伝送先とする出力部の伝送周波数を、当該コンテンツ信号に含まれる映像信号の必要最低周波数とし、前記第２の受信ユニットを伝送先とする出力部の伝送周波数を、当該コンテンツ信号に含まれる音声信号の必要最低周波数とすることを特徴とする請求項１に記載の送信装置。 The control unit sets the transmission frequency of the output unit having the first receiving unit as a transmission destination as the minimum required frequency of the video signal included in the content signal, and the output unit having the second receiving unit as the transmission destination The transmission apparatus according to claim 1, wherein the transmission frequency is set to a necessary minimum frequency of an audio signal included in the content signal.
  3. 　前記制御部は、前記第１の出力部が出力する音声信号を無音信号とし、前記第２の出力部が出力する映像信号を黒マスク信号とすることを特徴とする請求項１又は２に記載の送信装置。 3. The control unit according to claim 1, wherein the control unit uses the audio signal output from the first output unit as a silence signal and the video signal output from the second output unit as a black mask signal. 4. Transmitter.
  4. 　外部からの入力を受け取る入力部をさらに備え、
    　前記制御部は、前記入力部からの入力に基づき、前記第１の受信ユニットを伝送先とする出力部と、前記第２の受信ユニットを伝送先とする出力部とを決定することを特徴とする請求項１乃至３のいずれか一項に記載の送信装置。     It further includes an input unit that receives external input,
    The control unit determines an output unit having the first reception unit as a transmission destination and an output unit having the second reception unit as a transmission destination based on an input from the input unit. The transmission device according to any one of claims 1 to 3.
  5. 　前記制御部は、前記第１の受信ユニット及び／又は前記第２の受信ユニットから受信した制御信号に基づき、前記第１の受信ユニットを伝送先とする出力部と、前記第２の受信ユニットを伝送先とする出力部とを決定することを特徴とする請求項１乃至３のいずれか一項に記載の送信装置。 The control unit includes an output unit having the first reception unit as a transmission destination based on a control signal received from the first reception unit and / or the second reception unit, and the second reception unit. The transmission apparatus according to any one of claims 1 to 3, wherein an output unit as a transmission destination is determined.
  6. 　送信装置と、少なくとも映像信号を出力するための第１の受信ユニットと、音声信号を出力するための第２の受信ユニットとを備え、デジタルインタフェースを通じて音声信号と映像信号とを含むコンテンツ信号を送受信するコンテンツ再生システムであって、
    　前記送信装置は、
    　音声信号と映像信号とを共に出力可能であり、前記第１の受信ユニットへ前記コンテンツ信号を送信する第１の出力部と、
    　前記第１の出力部と同一規格であり、音声信号と映像信号とを共に出力可能であり、前記第２の受信ユニットへ前記コンテンツ信号を送信する第２の出力部と、
    　各々が異なる伝送周波数で前記コンテンツ信号を同時に伝送するように前記複数の出力部を制御するとともに、前記第１の受信ユニットに音声信号の再生禁止指示を送信し、前記第２の受信ユニットに映像信号の再生禁止指示を送信する制御部と、を備え、
    　前記第１及び第２の受信ユニットは、
    　前記送信装置から前記コンテンツ信号及び前記再生禁止指示を受信する受信部と、
    　前記コンテンツ信号に含まれる音声信号及び／又は映像信号を再生する再生部と、を備え、
    　前記再生部の各々は、前記映像信号の再生禁止指示を受信したときに前記音声信号のみを再生し、前記音声信号の再生禁止指示を受信したときに前記映像信号のみを再生することを特徴とするコンテンツ再生システム。     A transmission apparatus, a first reception unit for outputting at least a video signal, and a second reception unit for outputting an audio signal, and transmitting / receiving a content signal including the audio signal and the video signal through a digital interface A content playback system,
    The transmitter is
    A first output unit capable of outputting both an audio signal and a video signal, and transmitting the content signal to the first receiving unit;
    A second output unit that is the same standard as the first output unit, can output both an audio signal and a video signal, and transmits the content signal to the second receiving unit;
    The plurality of output units are controlled so that each of the content signals is simultaneously transmitted at different transmission frequencies, an audio signal reproduction prohibition instruction is transmitted to the first receiving unit, and video is transmitted to the second receiving unit. A control unit that transmits a signal reproduction prohibition instruction,
    The first and second receiving units are:
    A receiving unit for receiving the content signal and the reproduction prohibition instruction from the transmission device;
    A playback unit that plays back an audio signal and / or a video signal included in the content signal,
    Each of the reproduction units reproduces only the audio signal when receiving an instruction to prohibit reproduction of the video signal, and reproduces only the video signal when receiving an instruction to inhibit reproduction of the audio signal. Content playback system.
  7. 　前記第１及び第２の出力部が準拠する伝送規格はＨＤＭＩであることを特徴とする請求項１乃至６のいずれか一項に記載の送信装置またはコンテンツ再生システム。 The transmission apparatus or content reproduction system according to any one of claims 1 to 6, wherein the transmission standard to which the first and second output units comply is HDMI.
PCT/JP2008/058023 2008-04-25 2008-04-25 Content reproduction system WO2009130784A1 (en)

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