Device for the reception, the adaption of the frame rate and the distribution of coded digital audio and data signals

It is a device for distributing encoded and / or compressed digital Audio and data signals to a plurality of terminals, in particular in a motor vehicle, described, wherein receiving means are provided with which the encoded signals in first frame is received at a first frame rate, means Adaptation to a second frame rate are provided and distribution means are provided, by means of which the encoded audio data in second frames, with a second frame speed, to be distributed to the terminals and the terminals comprise means for encoding the audio and data signals. This can be by means of a Shift register are made, in which the data of the first frame is written, with a portion of the data from the shift register in a FIFO memory be taken, and the same cycle with the clock of the content Verteilmittels the FIFO memory are transferred to the second frame and the Distribution means are output.

State of the art

From DE 101 38 121 A1 is an electronic system and method for addressing known from devices having a first bus system based on static addresses, having a second bus system with at initialization dynamically allocated including addresses, showing a second bus system assigned static address and means for transforming a dynamic address to a quasi-static Address includes the quasi-static address to the second bus system assigned static address includes.

Core and advantages of the invention

The core of the present Erfmdung is to provide a device for distributing coded and / or compressed digital audio and data signals to multiple devices, in particular for use in a motor vehicle to provide, wherein the second via a Distribution means that connects multiple devices with each other, the coded and compressed audio and data signals are transmitted up to the terminal. According to the invention this is achieved by the features of the independent claims. Advantageous developments and refinements emerge from the Subclaims.

Advantageously, the means for decoding the audio signals as a DAB source decoders and the means for decoding the data signals as a data decoder educated. It is also advantageous that the encoded and / or compressed, digital signals are a DAB ensemble, which by means of a digital broadcasting system were transferred.

Advantageously, the first frame speed is higher than the second Frame rate.

Advantageously, the dispensing means is a multimedia bus. The multimedia can further, as the communication system according to one of IEEE 1394, USB, ISDN designed CAN, D2Boptical, Hiperlan, Ethernet / IEEE 802.3, MOST or Bluetooth be.

Furthermore, it is advantageous that the multimedia bus has a ring topology, and consists of one or more Datenverteilringen.

It is particularly advantageous that the multimedia optical as a Transmission system is formed, and from glass fiber or plastic fiber cables consists.

Advantageously, each terminal which is connected to the distribution means, the Means for decoding.

Advantageously, the means for decoding DAB source decoders and / or Data decoder.

Furthermore, it is advantageous that the means for adaptation to a second Frame speed is a shift register into which the data of the first frame is written that a FIFO memory is provided into which a part of the data are written from the shift register and that the same cycle with the cycle of is copied into the second frame Verteilmittels the contents of the FIFO memory and is output to the distribution means.

It is particularly advantageous that zero frames which can arrive as the first frame, in the shift register to be loaded, but not incorporated in the FIFO memory be and are therefore not distributed over the distribution means to the terminals.

Further features, application possibilities and advantages of the invention will be apparent from the following description of embodiments of the invention, in the are shown in the drawing figures. All described or represented, alone or in any combination form the subject matter of the Invention, irrespective of their summary in the claims or their And regardless of their formulation or representation in the Description or in the drawings.

drawings

Exemplary embodiments of the invention based on drawings explained. Show it<dl tsize="7" compact="compact"><dt>figure 1</dt><dd>a schematic block diagram of one embodiment of the A device according to the invention and</dd><dt>figure 2</dt><dd>a concrete embodiment of the device for adapting the first Frame rate to a second frame rate, which Output signals are passed on to the distribution means.</dd></dl>

Description of embodiments

In Figure 1, a receiving antenna 1 can be seen, for example, digital can receive broadcast signals, for example, encoded, compressed DAB signals or DRM signals. These signals are supplied to a receiving device the second It is known to decode in this receiving means 2 and the digital signals into analog Signals implemented programs by means of a second bus system Reproducing devices redistribute. The receiving means 2 takes only a Demodulation of signals and sets them, received in the first frame signals to and distributes the still encoded in a second frame format, and compressed digital audio and data signals to a distributor 3 on. This distributor, for example, as an annular multimedia means Fiber or plastic fiber cables to be realized. These distribution ring 3 are more Terminals 4 connected to the encoded and compressed digital audio and decode and decompress data signals and output devices 5 pass on. These output devices 5, for example, speakers, its screens, display devices or further processing devices. The terminal 4 in this case have the necessary source decoder and data decoder 20, by which the received compressed and coded digital signals for the Output devices 5 can be processed and, for example, than DAB source decoder and / or data decoders can be formed. This makes it possible to receive a complete DAB ensemble and fully to a distribution ring to give 3, so that the user of the terminal 4 can decide separately, they want to hear what program currently the transmitted DAB ensembles or what additional data is to be brought to play. The receiving means 2 can Here also have an output device 5, via the means of a Quellenund / or Data decoder decoded and decompressed information the user is supplied. Furthermore, it may be provided that the receiving device 2 further comprising an operating device 6, by means of which the entire receiving and can be controlled and operated distribution system.

In Figure 2, a detailed embodiment is shown, which by means of the Receiving data present in the first frame, in second frames are unseeded and be distributed via the distribution means. 3 The encoded, compressed and digital audio and data signals, for example, DAB signals or DRM signals can be, coming on line 7 and the padding recognition 8 are supplied. In the padding recognition 8 the incoming data of the line 7 in a be Shift register 9 enrolled. The size of the shift register may in this case of be of different sizes, depending on the data format, the on line 7 have incoming data. In the case of DAB data with a arrive frame rate of 48,000 frames per second, would be the Shift register 9 to be designed for 32-bit. The incoming on line 7 data in this case before synchronous RDI protocol. Since the DAB ensemble lower Data rate than the RDI interface, be called in RDI datastream idle frames, also referred to as a Padding frames or Nullrahemn inserted. For this purpose, the RDI data stream initially loaded into a shift register. 9 With the 22 bits of each half RDI frame begins the 4 bit long frametype-Word, which consists in padding frames a sequence of four zeros. These 4 bits with padding frames from a composed sequence of four zeros, are tapped by logic lines and a Logic block supplied. Detects the logic module, the presence of four zeros, so is on line 19, a padding recognition signal 19 to the FIFO controller 16 output. Padding frames via the line 10 only in the dual-port FIFO memory 11 is loaded, when the level of the dual-port FIFO memory 11 less than 32 bits is to ensure that the memory 11 can not run empty. Data frames by the padding detection were 8 not recognized as padding frames, are in any In case the dual-port FIFO memory 11 is loaded. The synchronizer 15 is both a synchronization signal of the first frame, for example, an RDI frame synchronization signal 13 is supplied, as well as a synchronization signal for the second frame of the multimedia bus, for example a MOST frame synchronization signal 14 are. The synchronization means 15 are two Outputs 17, 18 from which the output signal 17, the start signal of the first Frame, for example, the RDI-frame and the output 18 a start signal of the second frame, for example a MOST frame start signal. These two Frame start signals 17, 18, the FIFO memory controller 16 are supplied to the Filling of the dual-port FIFO memory 11 via the line 10, in the 9 shift register stored data controls, as well as the reading of the dual port FIFO memory 11 cached data and their output to the Distribution means 3, which is for example a multimedia bus, via the Output line 12, outputs data at the second frame rate. These dates For example, data with the MOST-data rate of 44,100 frames per second be. This is to ensure that only complete frame in the memory 11 are written so that a synchronization with the frame synchronization signal 14 of the multimedia bus 3 is possible. On the issue of second frame from the FIFO memory 11, the second frame to synchronously the frame synchronization signal 14 of Verteilmittels issued.