WO2010015991A2

WO2010015991A2 - Video reception system and method and video reception apparatus

Info

Publication number: WO2010015991A2
Application number: PCT/IB2009/053363
Authority: WO
Inventors: Vijay Hebbur Srinivas
Original assignee: Nxp B.V.
Priority date: 2008-08-04
Filing date: 2009-08-03
Publication date: 2010-02-11
Also published as: WO2010015991A3

Abstract

A video reception apparatus, such as a television set or a set-top box, is configured to forward an auxiliary data stream, such as a teletext data stream or a game program stream to an auxiliary device. A handheld device may be used as auxiliary device. When the user has selected a channel with video and audio streams that will be reproduced on the main audio and video reproduction devices, the apparatus determines whether the selected channel contains a suitable further information stream. If so, data derived from the further information stream is transmitted to the auxiliary reproduction device (12, 14). The video reception apparatus may keep a list of auxiliary devices that are to be used for this purpose and a dialogue may be started with such a device to show the availability of the further information stream and to select whether or not it should be rendered.

Description

VIDEO RECEPTION SYSTEM AND METHOD AND VIDEO RECEPTION

APPARATUS

FIELD OF THE INVENTION

The invention relates to video reproduction equipment.

BACKGROUND OF THE INVENTION A digital television signal may be passed as part of a transport stream that comprises a plurality of elementary streams, such as one or more elementary images streams, audio streams and data streams. When a user tunes a television set or a set top box to a digital television channel, the user effectively selects transport stream and optionally a number of elementary streams within the selected transport stream. In response the television set or a set top box extracts packets that contain the video and audio of the selected channels and routes them to a video and audio decoder respectively, and the resulting video and audio signals are used to control image display and sound reproduction. If desired, the television set can be switched to a teletext mode, wherein data from an elementary data stream is used to control image display, instead of the video. European patent application No 1760897 describes a system for Bluetooth streaming audio applications. A Bluetooth transceiver chip is provided with an audio codec. Bluetooth communication is used to transmit a coded audio stream to a sound reproduction device such as a head set. Similarly, a coded video stream can be transmitted to an image display device. Thus, Bluetooth may be used to pass the streams of a tuned channel wirelessly to audio and video reproduction devices. The result is the same as if a wired connection from a set top box to a television set is used, without the nuisance of cables to connect to all reproduction devices.

SUMMARY OF THE INVENTION

Among others, it is an object to use tuning to a channel to provide for more information rendering than obtained by tuning a television set to a channel.

A method of rendering information from a selected channel with a plurality of reproduction devices is provided according to claim 1. A further information stream, if present in the selected channel, is used to output data at an auxiliary reproduction device in addition to reproduction of the main audio and video at audio reproduction device and a video reproduction device. The main audio and video at audio reproduction device may be a television set for example (or a set-top box for supplying a television signal to a television set) and the auxiliary reproduction device may be a hand-held device for example. Wireless transmission to the auxiliary device may be used, using the Bluetooth protocol for example.

In an embodiment the further information stream may be used to reproduce teletext data from a selected channel at the auxiliary reproduction, while the main audio and video at audio reproduction device reproduce the main audio and video form the selected channel. In another embodiment, the auxiliary reproduction device may reproduce an audio stream different from the audio stream reproduced by the main audio reproduction device (herein "different" audio streams include different language audio channels for example, but it excludes related streams such as stereo channels representing simultaneous registrations of the same sound source). In another embodiment, the auxiliary reproduction device may be configured to execute a game playing program defined by the further information stream.

Thus, for example, a user may be enabled to play a game related to a television program on a hand-held game playing device.

In an embodiment the detection of the further information stream is signaled to a user and transmission of data from the further information stream to the auxiliary reproduction device is performed when this is selected by the user. Thus, the user may be informed that one or more additional streams are available in the channel that he or she has selected and reproduction of such a stream can be started if desired. In a further embodiment, the auxiliary reproduction device may be paired to a video reception apparatus in advance, to indicate that it may be used for reproducing an auxiliary stream from a selectable channel. In this embodiment detection of the further information stream may signaled when such a paired auxiliary reproduction device is found to be actively present, for example by displaying the signal at the paired auxiliary reproduction device, or by displaying the signal elsewhere.

In an embodiment a video reception apparatus according to claim 5 is provided. This video reception apparatus may a television set for example, which supplies audio and video signal to internal loudspeakers and a display screen, in another example it may be a set-top box that supplies audio and video signals to a television set. The video reception apparatus detects whether a further information stream is present in a selected channel and uses this further information stream to transmit information to an auxiliary reproduction device. A wireless transmitter may be used for example. Such a wireless transmitter may use the Bluetooth protocol for example.

In a further embodiment the reproduction capability of the auxiliary reproduction device may be compared with an information type of the detected further information stream. In this case transmission of the data derived from the further information stream may be controlled dependent on a result of said comparison. Thus for example a selection between a plurality of auxiliary reproduction devices may be made, according to whether they are capable of reproducing data derived from the further information stream. As another example data derived from the further information stream may be transmitted only if the auxiliary reproduction device is capable of reproducing data derived from the further information stream. In an embodiment a transcoder may be used to transcode the further information stream according to a reproduction capability of the auxiliary reproduction device.

The video reception apparatus may be part of a video reception system that comprises the auxiliary reproduction device. The auxiliary reproduction device may be used to indicate availability of the further information stream to a user. In an embodiment the auxiliary reproduction device may be configured to execute a game playing program defined by the further information stream, or to display text data, such as teletext data.

In an embodiment the auxiliary reproduction device may capture an image and/or audio and send it back to the video reception apparatus, to mix it into the supplied video and/or audio. In a game playing embodiment this may be used to integrate the user in the main video and/or audio, for example as part of a Karaoke-like game.

BRIEF DESCRIPTION OF THE DRAWINGS These and other objects and advantageous aspects will become apparent from a description of exemplary embodiments, using the following Figures.

Fig. 1 shows a reception system

Figs. 2-4 illustrate exchanged messages

Fig. 5 shows a reception system Fig. 6 shows a reception system with two-way transmission

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Fig. 1 shows a reception system, comprising a television set 10, and a plurality of auxiliary devices 12, 14. The television set comprises a channel receiver circuit 100, a channel decoder 102, an elementary stream demultiplexer 104, a demultiplexing control circuit 105, a video branch 106, an audio branch 107, a transceiver branch 108 and a control circuit 109. Channel decoder 102 is coupled between receiver circuit 100 and elementary stream demultiplexer 104. One of the auxiliary devices 14 is shown to contain a transceiver 140, a data decoder 142, a display driver 144 and a display device 145 coupled in series. Elementary stream demultiplexer 104 has outputs coupled to video branch 106, audio branch 107 and transceiver branch 108. Demultiplexing control circuit 105 is coupled to a control input of elementary stream demultiplexer 104. Control circuit 109 has outputs coupled to receiver 100, channel decoder 102, demultiplexing control circuit 105, video branch 106 and audio branch 107. Control circuit 109 may be implemented for example as a programmable processor circuit, programmed with a program of instructions to make programmable processor circuit perform the functions of the control circuit as will be described. Alternatively, an application specific circuit may be used, designed to perform these functions. Video branch 106 comprises video processing circuitry like a video decoder

106a, with an input coupled to an output of the elementary stream demultiplexer 104, and a series connection of a display driver 106b and a display device 106c coupled to the video decoder 106a. The audio branch 107 comprises audio processing circuitry like an audio decoder 107a, with an input coupled to an output of the elementary stream demultiplexer 104, and a series connection of an audio amplifier 107b and a loudspeaker 107c coupled to the audio decoder 107a.

The transceiver branch 108 comprises a transceiver control circuit 108a, a transmitter 108b and a receiver 108c. Transceiver control circuit 108a is coupled between an output of elementary stream demultiplexer 104 on one hand and transmitter 108b and a receiver 108c on the other hand. In an embodiment transceiver branch 108 is a Bluetooth transceiver unit.

In operation control circuit 109 receives input from a user to select a program to be rendered by video branch 106 and audio branch 107, which constitute the primary outputs of television set. In addition, the user may "pair" a selected auxiliary device 14 to the television set, in order to use the paired auxiliary device 14 to render a data stream from the channel that contains the selected program but that is not rendered by either the video branch 106 or the audio branch 107. Thus for example, teletext data of the selected program may be forwarded by the television set 10 and displayed on an auxiliary device 14 like a mobile phone, while the video and audio of that program are rendered at the television set 10. Channel receiver circuit 100 constitutes a channel selector. It may comprise an RF demodulator for demodulating the streams in a selected channel in an RF spectrum transmitted via a cable TV system or via an antenna. Dependent on the source of the channel a different type of channel selector may be used. When the source is a storage medium storing a plurality of channels (e.g. in different storage regions), channel receiver circuit 100 may be replaced by a receiver circuit to read information from a selected channel in the storage medium.

In response to program selection operation control circuit 109 sends a control signal to receiver 100 to tune receiver 100 to a channel that contains the selected program. Receiver 100 receives and demodulates signals in the selected channel and passes a result to channel decoder 102. Channel decoder 102 forms a transport stream from the result. An MPEG compatible transport stream may be formed for example. The transport stream comprises a succession of data packets, which form one or more parallel television programs, each comprising a plurality of elementary streams. Each stream comprises a respective sub- set of the succession of data packets in the transport stream. The elementary streams of a program may include a video stream, an audio stream and an auxiliary data stream. The packets contain labels (also called PIDs-Program Identification), which identify packets of the respective elementary streams that make up a program.

Elementary stream demultiplexer 104 splits transport stream into elementary streams, each elementary stream corresponds to a label (PID) and is made up of packets from the transport stream with that label. Elementary stream demultiplexer 104 supplies an elementary video stream and an elementary audio stream of the program to video branch 106 and audio branch 107 respectively. When controlled to do so, elementary stream demultiplexer 104 furthermore supplies an elementary auxiliary data stream from the selected channel that contains the program, different from the audio and video streams, to transceiver branch 108. Video branch 106 decodes the video stream and uses the decoded data to control image display on display device 106c. Audio branch 107 decodes the audio stream and uses the decoded data to control sound reproduction by loudspeaker 107c. Transceiver branch 108 transmits data derived from the elementary auxiliary data stream to an auxiliary device 14, which receives the data and uses it to control the content of an image displayed by the auxiliary device 14.

In a first embodiment, the television set 10 is configured to maintain a list of auxiliary devices 12, 14 that are paired to the television set and the types of stream that may be sent to them. In this embodiment the television set is configured to send a notification message to an auxiliary device 12, 14 from the list, when an elementary stream of the type recorded in the list becomes available, after tuning to a channel or after switching on the television set 10.

In this first embodiment control circuit 109 may comprise a memory to stored the list and a programmable processor with a program configured to respond to switch on, or a change of channel, by (1) detecting the types of the elementary streams that are present in the received transport stream, (2) going through the stored list and (3) controlling transceiver branch 108 to transmit a notification message to a device encountered in the list, if the type of stream included in the list for that device matches a detected type of the elementary streams in the received transport stream. This process may be repeated each time when a different program is selected.

Fig. 2 illustrates messages exchanged between the television set (indicated by line 20) and the auxiliary device 12, 14 (indicated by line 22). The notification message is indicated by arrow 23. In the first embodiment, auxiliary devices 12, 14 are configured to receive notification messages and to respond by transmitting a confirmation message 24 to confirm that a stream should be started. A auxiliary device 12, 14 may be configured to display a question to a user whether or not a stream is needed on its display device, upon receiving the notification and to transmit the confirmation message dependent on a received response of the user. In this first embodiment transceiver branch 108 receives the confirmation message and signals this to control circuit 109. In response, control circuit updates information in demultiplexing control circuit 105 to set elementary stream demultiplexer 104 to forward the packets of the elementary stream of the type indicated in the list to transceiver branch 108. Transceiver branch 108 transmits successive messages 25 from this stream to the auxiliary device 12, 14 that has sent a confirmation message 24. The first embodiment has the effect that the bandwidth and power consumption used for the auxiliary stream can be minimized.

In a second embodiment, the television set 10 is configured to start transmission of the auxiliary stream without confirmation. In this embodiment control circuit 109 also maintains a list of auxiliary devices 12, 14 that are paired to the television set and the types of stream that may be sent to them. When switching to a new channel and upon detection that that channel contains a stream of a type that the list associates with a auxiliary device 12, 14 control circuit 109 updates information in demultiplexing control circuit 105 to set elementary stream demultiplexer 104 to forward the packets of the elementary stream of the type indicated in the list to transceiver branch 108. Transceiver branch 108 transmits messages from this stream to the auxiliary device 12, 14.

In a third embodiment, the television set 10 is configured to wait for a command to start transmission of the auxiliary stream. In this embodiment, control circuit 109 controls transceiver branch 108 to transmit discovery messages and to receive back responses to detect auxiliary devices 12, 14. Upon a receiving request command from a user, control circuit 109 controls video branch 106 to display a list of discovered devices and their rendering capabilities. Upon a receiving a selection command from a user, control circuit 109 proceeds as in the second embodiment, by updating information in demultiplexing control circuit 105 to set elementary stream demultiplexer 104 to forward the packets of the elementary stream of the type indicated in the list to transceiver branch 108.

Fig. 3 shows another embodiment, wherein the auxiliary device 12, 14 also selects the type of stream. Here, it is assumed that the list indicates a plurality of stream types that can be handled by the auxiliary device 12, 14. In this embodiment, control circuit 109 is configured to respond to confirmation message 24 by transmitting a message 30 with a list of available stream types in the transport stream of the selected channel of television set 10. Auxiliary device 12, 14 responds with a selection message 32, selecting one type of stream. In an embodiment, the auxiliary device 12, 14 is configured to ask the user which of the types should be received and to generate selection message 32 dependent on a user response. Absent a response a default stream type may be selected, or transmission of the stream may be prevented.

As may be noted, this embodiment allows for a flexible response to the content of the transport stream that television set 10 obtains by tuning to a channel. Dependent on whether there are fewer or more auxiliary streams in addition to the primary audio and video streams rendered by the audio and video branches, the auxiliary device 12, 14 will get a more limited or broader choice.

In another embodiment, the television set 10 is configured to enable a user to add a new device to the list. Control circuit 109 is configured to control video branch 106 to display available devices upon receiving an edit command, and to receive selection commands indicating a selected one of the available auxiliary devices 12, 14. In this embodiment, control circuit 109 adds the selected one of the devices to the list, combined with a type of stream that the device may render. If the device is capable of rendering only one type of stream, this type may be added automatically. If the device is capable of displaying more than type of stream, the user may be asked to select a type of stream. In another embodiment, the command to enter an auxiliary device is entered from the auxiliary device 12, 14. In this embodiment, the auxiliary device is configured to send a request to be entered on the list to transceiver branch 108. Transceiver branch 108 is configured to report this request to control circuit 109 and control circuit 109 is configured to enter the auxiliary device on the list in response.

In a further embodiment, the television set 10 is configured to search for auxiliary devices that are not included in the list. In this embodiment, control circuit 109 controls transceiver branch 108 to transmit discovery messages and to receive back responses to detect auxiliary devices 12, 14. Control circuit 109 compares the identified of discovered devices 12, 14 with devices in the list. If the discovered device is not present it may be presented as an available device.

In an embodiment transceiver branch 108 is configured to perform transcoding of data. Thus for example, if a selected stream contains teletext data and the auxiliary device is configured to display images, but not for translation of character codes into images, transceiver branch 108 may be configured to use character codes from the stream to compute an image that shows characters according to the character codes and to send data representing the computed image to the auxiliary device 12, 14 in a format that is acceptable to the auxiliary device. Other forms of transcoding may comprise transcoding between different compressed image formats or different compressed audio formats, or decompression to an uncompressed format.

Fig. 4 shows messages used in an embodiment to set up transcoding. Herein control circuit 109 is configured to cause a request message 40 for reporting an acceptable format to be sent and auxiliary device 12, 14 is configured to respond by sending a report message with an acceptable format. Subsequently, control circuit 109 activates the selected form of transcoding in transceiver branch 108.

Fig. 5 shows an embodiment wherein transceiver branch 108 is configured to transmit messages with data derived from a plurality of streams concurrently (e.g. in time multiplexed fashion) to a plurality of auxiliary devices 12, 14. In the example shown, the elementary streams applied to transceiver branch 108 include an auxiliary stream and a copy of the primary audio stream that is rendered by audio branch 107. In this way, transceiver branch 108 may be used for example to transmit the primary audio stream to a remote loudspeaker or a headset, in addition to transmitting an auxiliary stream other than the primary audio stream and the primary video stream. Although examples have been shown wherein the auxiliary stream transmitted by transceiver branch 108 is derived from a data stream, like a stream with teletext data, it should be appreciated that alternatively the auxiliary stream may be a different language audio stream from the transport stream selected by the user, in which case the auxiliary device may be a sound rendering device, such as a head set. In this way, the audio branch 107 and the auxiliary device may be used to render different audio outputs simultaneously. In another embodiment the auxiliary stream may be a video stream from the transport stream selected by the user, other than the video stream that has been selected for display by video branch 106. In this way, the video branch 106 and the auxiliary device may be used to render different video outputs simultaneously.

In an embodiment the auxiliary device 12, 14 may be used to render sub-title information. In this embodiment transceiver control circuit 108a may be configured to select sub-title information from the auxiliary stream and to cause the selected sub-title information to be transmitted. Alternatively, selection may be left to the auxiliary device 12, 14, the complete auxiliary stream being transmitted to the auxiliary device 12, 14. In an embodiment the auxiliary device 12, 14 may be used to render teletext information. In a further embodiment may perform selection of pages from a complete received teletext stream. In another embodiment, transceiver control circuit 108a may be configured to perform page selection in response to page selection codes received from an auxiliary device 12, 14 and to transmit only the selected page.

In an embodiment the auxiliary device 12, 14 may be used to run a game program defined in an auxiliary stream that is included with a primary video stream and transmitted to the auxiliary device 12, 14. Thus, for example, the user could play a game related to the primary video stream, wherein the course of the game (selection of image displayed at the auxiliary device 12, 14 and/or their content) is determined both by operation of the auxiliary device by the user and information from the further information stream.

Fig. 6 shows an embodiment that allows for reverse streaming. Herein transceiver control circuit 108a has an output coupled to video branch 106 for supplying an external video stream and video branch is configured to include the external video stream in a displayed image in a picture in picture (PIP) or other multi- window configuration. A similar connection (not shown) from transceiver control circuit 108a to audio branch 107 may be provided. In this case audio branch 107 may be configured to mix in a sound signal from transceiver control circuit 108a. Transceiver control circuit 108a may be configured to receive this video and/or audio stream from an auxiliary device via receiver 108c. In an embodiment reverse streaming is used to support a game program executed by auxiliary device 12, 14 and derived from the further information stream. Thus for example, an image and/or sound captured by the auxiliary device 12, 14 may be transmitted dependent on the state of the game. An image of the head of a user may be mixed into the primary video image. In an embodiment, the further stream may comprise information specifying a position in the video signal where the captured image may be added. Thus for example, an image of the head of the used may be made to move along with the image of a body in the primary video. In another application the image may be mixed in for closed circuit TV applications. Although embodiments have been described in a television set, it should be understood that similar measures may be implemented in a set-top box that is designed to supply primary video and audio signals to a television set, obtained by program selection from a user. In this case the video and audio processing circuitry in the set-top box may comprise a driver circuit for supplying the video and audio information in digital or analog form, or a modulator to modulate audio and video information onto a carrier.

Although it is preferred to use a graphical user interface at the auxiliary device 12, 14 to give the user control over the activation of transmission of the additional information stream, it should be appreciated that alternatively other control mechanisms may be used, for example a switch, a movement detector or an orientation detector may be used to control the activation.

It should be appreciated that a system has been described that allows for rendering of primary video and/or audio data from a user selectable program, combined with relay of auxiliary data from the selected channel with the program to an auxiliary device. The auxiliary data may be teletext data, or data from other streams that are not used for the primary audio and video rendering of the selected program. User selection of the auxiliary devices may be provided for and the auxiliary devices may be activated dependent on the content of the channel that the user has selected.

Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. A single processor or other unit may fulfil the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measured cannot be used to advantage. A computer program may be stored/distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems. Any reference signs in the claims should not be construed as limiting the scope.

Claims

CLAIMS:

1. A method of rendering information from a selected channel of a multichannel video signal, using a plurality of reproduction devices (106c, 107c, 12, 14), the method comprising: receiving a selection command to select a channel; - selecting the channel in response to the selection command, the channel carrying a plurality of streams, comprising a first video stream, a first audio stream and a further information stream; routing information from the first audio stream and the first video stream to an audio reproduction device (107c) and a video reproduction device (106c) respectively; - detecting whether the further information stream is present in the selected channel in addition to the first audio stream and the first video streams; and, if so, transmitting data derived from the further information stream to an auxiliary reproduction device (12, 14) other than the audio reproduction device (107c) and the video reproduction device (106c); - using the derived data to reproduce information at the auxiliary reproduction device (12, 14).

2. A method according to claim 1, wherein the further information stream comprises text code, the method comprising assembling an image dependent on the text code and rendering the image at the auxiliary device (12, 14).

3. A method according to claim 1, wherein the further information stream is a further audio stream, different from the first audio stream.

4. A method according to claim 1, comprising: signaling the detection of the further information stream to a user; receiving a selection of the signaled further information stream; said transmitting being performed conditional on reception of the selection of the further information stream.

5. A video reception apparatus (10), comprising: a channel selector (100), with an output for supplying a plurality of streams from a selectable channel, the channel selector being configured to output a first video stream, a first audio stream and an optional further information stream, dependent on a selected channel; video and audio processing circuitry (102, 104, 106a,b, 107a,b) coupled to the output and configured to supply video and audio derived from the first video stream and the first audio stream to video and audio reproduction devices (106c, 107c); - a transmitter (108b) coupled to the output; a control circuit (109) configured to detect whether the further information stream is present in the selected channel and in response to said detection to control the transmitter (108b) to transmit data derived from the further information stream to an auxiliary reproduction device (12, 14) other than the video and audio reproduction devices (106c, 107c).

6. A video reception apparatus according to claim 5, wherein the control circuit (109) is configured to cause detection of the further information stream to be signaled to a user, to receive a selection of the signaled further information stream and to activate the transmitter (108b) to transmit the data derived from the further information stream in response to the selection of the signaled further information stream.

7. A video reception apparatus according to claim 6, wherein the control circuit (109) is configured to detect a plurality of optional further information streams in the selected channel and to cause signaling of identifications of the plurality of further information streams detected in the selected channel to the user, for selection of the further information stream for transmission.

8. A video reception apparatus according to claim 5, wherein the control circuit is configured to compare a reproduction capability of the auxiliary reproduction device (12,

14) with an information type of the detected further information stream and to control transmission of the data derived from the further information stream dependent on a result of said comparison.

9. A video reception apparatus according to claim 8, wherein the control circuit is configured to activate the transmitter to transmit the data derived from the further information stream only if the information type and the reproduction capability match.

10. A video reception apparatus according to claim 5, comprising a transcoder

(108a) coupled between the channel selector (100) and the transmitter (108c) and configured to transcode the further information stream according to a reproduction capability of the auxiliary reproduction device (12, 14).

11. A video reception apparatus according to claim 5, wherein the control circuit

(109) is configured to store an identification of the auxiliary reproduction device (12, 14), the control circuit (109) being configured to detect whether the identified auxiliary reproduction device (12, 14) for which said identification is stored is actively present and to activate the transmitter (108b) to transmit the data derived from the further information stream in response to the detection of the active presence.

12. A video reception system, comprising a video reception apparatus (10) according to claim 5 and the auxiliary reproduction device (12, 14), configured to receive and render the data derived from the further information stream.

13. A video reception system according to claim 12, wherein the auxiliary reproduction device (12, 14) is configured to indicate availability of the further information stream to a user and to send a request to the video reception apparatus (10) to transmit the data derived from the further information stream upon detecting a selection action by the user.

14. A video reception system according to claim 12, wherein the auxiliary reproduction device (12, 14) is configured to execute an interactive game playing program defined by the further information stream.

15. A video reception system according to claim 12, wherein the auxiliary reproduction device (12, 14) comprises a display screen (144), the auxiliary reproduction device (12, 14) being configured to control an image content of an image displayed on the display screen (144) dependent on text codes from the further information stream.

16. A video reception system according to claim 12, wherein the auxiliary reproduction device (12, 14) comprises a image and/or audio capture device and a transmitter configured to transmit information representing the captured image and/or audio back to the video reception apparatus (10), the video reception apparatus (10) being configured to mix in the captured image and/or audio in the supplied video and/or audio.