DE20018402U1 - Receiver for digital signals, especially image and sound data with an integrated audio / video radio transmission system - Google Patents

Description

TechniSat Digital GmbH
TechniPark
54550 Daun

Receiver for digital signals, especially image and sound data with integrated audio/video radio transmission system

Description

There are currently various systems for wireless transmission of video and audio signals that can be connected to a receiver or other sources, for example, in order to then wirelessly transmit the signal from this source to a receiver within a certain range. The commissioning of these systems requires a certain level of technical understanding from the user, as the systems require a considerable amount of cabling to be put into operation. In addition, there must always be sufficient space for the additional equipment or it must be created. These systems also require a free Scart connection on the receiver.

The inventive achievement of this system is to integrate the corresponding transmission equipment into the digital receiver and thus to put the system into operation on the transmitter side without any further connections to an additional stationary system and to receive the radio signals with a corresponding receiver on the desired device. These signals are also available stationary by coupling them out to a Scart socket. The analogue transmission also makes it possible to loop signals from external analogue sources, for example a video recorder, into the system via a Scart socket and to transmit them wirelessly to another receiver. Due to the bandwidth available for radio transmission, only one television program can be transmitted at a time. This program must therefore be selected from the digital data stream and demodulated so that the audio and video signals required for radio transmission are then available. After the necessary amplification, these can now be transmitted wirelessly using the audio/video radio transmission system. Due to the fact described above that

only one television program can be transmitted at a time, the channel on which the desired television program is located must be selected. The selection level must be designed in such a way that each of the available channels can be selected. To do this, the appropriate commands must be sent to the selection unit. To do this, it is advisable to store the information required to select the individual channel in a memory. This can then be individually programmed by the user. During later operation, the individual parameters stored in the memory can be called up using a remote control and the special radio return channel for remote control signals, so that the individual channels can be selected. To make channel selection easier, the device has an EPG (electronic program guide), with the help of which additional information about the program name and program content can be displayed on the screen.

The way it works is explained in Fig. 1. The digital signal is available at the connection box (1), depending on the connected system. This is passed on to the corresponding input tuner (2) via a standard antenna connection cable. The required frequency is selected in the tuner and passed on to the MPEG2 decoder (3). After demodulation, the analog signals for video and audio are available on the output side. In the version of transmitting the audio signal in stereo presented here, the audio signals on the right and left are amplified to the required level (4) and (5) and passed on to the transmitter unit (7). With multi-channel sound transmission, each channel is amplified separately. The video signal is also amplified accordingly (6) and also passed on to the transmitter unit (7). These signals can also be tapped off at the Scart socket (18). The signal is then transmitted wirelessly from the transmitter unit (7) to the receiver (8), demodulated and passed on to a television receiver (9) via a connection cable. The device can be operated at the receiving location using the remote control (17). The infrared signals are received by an IR receiver (10), passed on to the modulator (11) and transmitted via radio to the radio receiver (12). The received signal is demodulated in the radio receiver (12) and passed on to an evaluation unit (14). The IR signals from the integrated infrared receiver (13) are also fed to the evaluation unit (14). After appropriate evaluation in the evaluation unit (14), the commands are passed on to the processor (15), through which

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which then, in turn, according to the commands, the parameters in the memory (16) for the selection and demodulation of a digital program are forwarded to the input tuner and MPEG2 decoder.

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Claims (1)

1. A receiving device for digital signals, in particular image and sound data, characterized in that an analog audio/video radio transmission system equipped with a return channel is integrated into this device.