DE20009939U1 - DVB receiving device - Google Patents

Description

sLYJ.LÜ'V/: 5sJ

TechniSat Digital GmbH
Tech &eegr; i Park
54550 Daun

DVB receiver Description

The DVB standard specifies the transmission of audio and video data as well as the transmission of pure data services. In addition to the usual digital television and radio programs, other data can also be transmitted, such as Internet services. This is already being implemented today. To receive the individual services, specially designed receivers are required, such as a set-top box for receiving and playing television and radio programs. A special PC card is usually required to receive data services. If television and radio programs are to be recorded, the usual recording devices are available, such as video recorders. Recently, devices have also become known that can make recordings using an internal storage medium.

The devices currently known, however, have the disadvantage that only one service can be received. Simultaneous reception and processing of different services or programs cannot be achieved with these devices. The purpose of the invention described below is to be able to carry out the above-mentioned functions with one device. For this purpose, the device has several receiving parts that can work independently of one another. Such a receiving part consists of at least a tuner, demodulator, error correction and a demultiplexer. The MPEG data stream is then available at the output of the demultiplexer for further processing. Due to the independently working receiving parts, several different data streams are available in the device at the same time. These can then be used for different purposes.

an internal storage medium (e.g. hard disk)', data streams can be recorded and

at any later time, it can be fed to an audio/video decoder to generate the picture and sound signals or to a computer for further processing.

The following example will explain how such a DVB device works. The variant for DVB reception via satellite was chosen as an example:

The complete signals received from the satellite antenna are available at the tuner inputs (0). The desired transponders are then filtered out in the tuners (1), (5) and (10) and demodulated via the QPSK demodulators (2), (6) and (11). The demodulated signal is then fed to the error correction stages (3), (7) and (12). The data streams stored in the transponder are then demultiplexed in stages (4), (8) and (13). The MPEG data stream is available at the outputs of the demultiplexers (4), (8) and (13). The MPEG data stream is fed from the demultiplexer (4) to the source switch (14), which feeds the audio/video decoder (16). This in turn feeds the PAL encoder (17), at whose output (20) the video signal is available for feeding a television or video recorder. The sound information is obtained from the audio digital/analog converter (18), which is fed by the audio/video decoder (16). The sound is then available in mono or usually in stereo at the output (21) of the audio digital/analog converter (18). The audio data in digital form is output at the output (22) of the SPDIF module (19), which in turn is fed by the audio/video decoder (16).

The MPEG data stream available at the output of the demultiplexer (8) is fed to the hard disk (9), where it is stored. The data stored here can be played back and fed to the audio/video decoder via the source switch (14) or passed on to the computer interface (23) via the data switch (15). A PC can then be connected to this interface. The data stream available at the demultiplexer (13) is fed directly to a corresponding data interface to which a PC can be connected.

With this receiver described in the example, three different DVB data streams can be received and processed independently of each other.

For example, image and sound data from one program can be played on a television set, while image and sound data from another program are stored on the internal storage medium for later use. At the same time, a PC can also be supplied with data to enable simultaneous Internet services.

Claims (7)

1. Receiver for digital signals according to the DVB standard, characterized in that it has several receiving sections, each with its own demodulator, error correction and demultiplexer. 2. Receiver for digital signals according to the DVB standard, characterized in that it has an integrated hard disk for storing the already demultiplexed data stream in MPEG format. 3. Receiver for digital signals according to the DVB standard, characterized in that it has an audio-video decoder. 4. Receiver for digital signals according to the DVB standard, characterized in that it has one or more data stream switches. 5. Receiver for digital signals according to the DVB standard according to protection claims 1 and 2, characterized in that it has several receiver parts, each with its own demodulator, error correction and demultiplexer, as well as an integrated hard disk for storing the already demultiplexed data stream in MPEG format. 6. Receiver for digital signals according to DVB standard, according to protection claims 1, 3 and 4, characterized in that it has several receiving parts, each with its own demodulator, error correction and demultiplexer, as well as an audio-video decoder and one or more data stream switches. 7. Receiver for digital signals according to DVB standard, according to protection claims 1, 2, 3 and 4, characterized in that it has several receiver parts, each with its own demodulator, error correction and demultiplexer, furthermore an integrated hard disk for storing the already demultiplexed data stream in MPEG format as well as an audio-video decoder and one or more data stream switches.