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, described in particular in a motor vehicle, where reception means are provided with which the encoded signals in first frames are received at a first frame speed, means are provided for adaptation to a second frame speed, and distribution means are provided, by means of which the encoded audio data in the second frame, are distributed with a second frame rate at the terminals and having terminals means for encoding the audio and data signals. This can be done by means of a shift register in which the data of the first frame are written with a portion of the data from the shift register are transferred into a FIFO memory, and the same cycle with the clock of the Verteilmittels the contents of the FIFO memory the second in the frames are taken and are output to the distribution means.

State of the art

From the <patcit id="pcit0001" dnum="DE10138121A1"><text>DE 101 38 121 A1</text></patcit> is an electronic system and method of addressing of devices is known which, based on static addresses, comprising a first bus, a second bus system with dynamically assigned during an initialization address having a second bus system assigned static address showing and means for transforming a dynamic address included in a quasi-static address, the quasi-static address includes the second bus system assigned static address.

From the <patcit id="pcit0002" dnum="EP1006751A2"><text>EP 1006751 A2</text></patcit> is a method and apparatus for flow control of frame-based data communication data is known, which in particular, but not exclusively digital hierarchy network are transmitted over a synchronous digital network and on the control of the flow rate of the frame-based IEEE 802.3 communication data over a synchronous. Here is a high data rate can be provided, which is characterized by high reliability and functionality that is available at the usual local area networks and wide area network, which includes a high capacity exhibiting synchronous long-distance digital network. Furthermore, customized data rates between conventional data communication systems and conventional telecommunications systems are to be provided in an effective manner. Furthermore, the device according to the invention and the associated method has the task to ensure that go not lost a frame based data channel interface transmitted to a synchronous digital network data and more reliable and efficient way to insert into a system of virtual containers. From the<patcit id="pcit0003" dnum="US5617419A"><text>US 5,617,419</text></patcit> is a known communication network that consists of nodes and links, are transmitted via the different types of data frames, whichever transfer protocol such as Token Ring, Ethernet, FDDI or ATM, is used. It is recognized by transmission Adapters of data frame type and adapted accordingly, that a network transmission is made possible. From the<patcit id="pcit0004" dnum="US6078592A"><text>US 6,078,592</text></patcit> is a DAB receiver for receiving a digital audio broadcast signal (DAB) is known, the means for decoding a received DAB signal comprises dividing the signal into a first sequence of data, organized is decoded in frames of a first type, said frames at predetermined locations comprise a plurality of types of data within the frame.

Core and advantages of the invention

The core of the present invention is to provide a device for distributing encoded and / or compressed, digital audio and data signals to multiple terminals, in particular for use in a motor vehicle to provide, wherein via a second distribution means which connects a plurality of terminals with each other, the encoded 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 is constructed as a data decoder. It is also advantageous that the encoded and / or compressed digital signals are a DAB ensemble which have been transmitted using a digital broadcasting system.

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

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

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

it that the multimedia bus is configured as an optical transmission system, and is composed of glass fiber or plastic fiber cables is particularly advantageous.

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 decoders.

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 are written in that a FIFO memory is provided into which a part of the data is written from the shift register and that clock equal to is copied into the second frame with the clock of the 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, are loaded into the shift register, are not incorporated in the FIFO memory and hence do not have the distribution means to the terminals are distributed.

Further features, application possibilities and advantages of the invention will become apparent from the following description of embodiments of the invention, which are illustrated in the drawing figures. All the features themselves or in any combination described or illustrated form the subject matter of the invention, irrespective of their summary in the claims or their dependencies and irrespective of their wording or . Representation in the description or in the drawings.

drawings

Embodiments of the invention are explained with reference to drawings. Show it<dl id="dl0001" compact="compact"><dt>figure 1</dt><dd>a schematic block diagram of an embodiment of the device according to the invention and</dd><dt>figure 2</dt><dd>a specific embodiment of the device for adapting the first frame rate to a second frame rate, the output signals are passed on to the distribution means.</dd></dl>

Description of embodiments

In Figure 1, a receiving antenna 1 can be seen which can receive digital broadcast signals, for example, 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 reception means 2, the digital signals and redistribute converted into analog signals by means of programs of a second bus system to playback devices. The receiving means 2 performs only a demodulation of the signals by and shall, in the received first frame signals into a second frame format and distributes the still encoded and compressed, digital audio and data signals to a distributor 3 on. This distributor may be realized for example as an annular multimedia means of fiber or plastic fiber cables. These distribution ring 3 a plurality of terminals 4 are connected, decode the encoded and compressed digital audio and data signals and decompress and pass it on output devices. 5 These output devices 5 can be, for example, speakers, screens, display devices or further processing devices. The terminal 4 in this case have the necessary source decoder and data decoder 20, by means of which the received, compressed and encoded digital signals for output devices 5 can be processed and, for example, than DAB source decoders and / or data decoder can be formed. This makes it possible to receive a complete DAB ensemble and give fully to a distribution ring 3, so that the user of the terminal 4 can decide separately, they want to hear currently what program the transmitted DAB ensembles or what additional data for playback intended to be placed. The receiving means 2 can have an output device 5 in this case also, about the decoded by means of a source and / or data decoder and decompressed information is supplied to the user. Furthermore, it may be provided that the receiving device 2 further comprises a control device 6, by means of which the entire reception and distribution can be controlled and operated.

2 shows a detailed embodiment is illustrated by means of the reception data, which are present in the first frame, in second frames are unset and be further distributed via the distribution means. 3 The encoded, compressed and digital audio and data signals may be, for example, DAB signals or DRM signals come on line 7 and the padding recognition 8 are supplied. In the padding recognition 8, the incoming data of the line 7 are written into a shift register. 9 The size of the shift register here may be of different sizes, depending on the data format have the incoming data on line 7. In the case of DAB data arriving at a frame rate of 48,000 frames per second, the shift register 9 would be designed for 32-bit. The incoming on line 7 data are in this case before the synchronous RDI protocol. Since the DAB ensemble has a lower data rate than the RDI interface are in the RDI data stream, so-called idle frame, also referred to as a Padding frames or Nullrahemn inserted. For this purpose, the RDI data stream is initially loaded into a shift register. 9 With the 22 bits of each half RDI frame, the 4-bit long start frame type word, which consists of a sequence of four zeros with Padding frames. These 4 bits that exist in padding frames from a sequence of four zeros, tapped by logic lines and fed to a logic device. Detects the logic module, the presence of four zeros, then a padding recognition signal 19 output on line 19 to the FIFO control sixteenth Padding frames are only charged via line 10 into the dual port FIFO memory 11, when the level of the dual-port FIFO memory 11 is less than 32 bits, so that the memory 11 can not run empty. Data frames which have not been recognized by the recognition Padding Padding frames 8 as will be loaded in each case, in the dual-port FIFO memory eleventh The synchronization device 15 is fed to both a synchronization signal of the first frame, for example, an RDI frame synchronization signal 13, as well as a synchronization signal for the second frame of the multimedia bus, which are for example a MOST frame synchronization signal fourteenth The synchronization means 15 outputs two output signals 17, 18, wherein the output signal 17 is the start signal of the first frame, for example, the RDI-frame and the output signal 18 is 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, controlled by the data stored in the shift register 9, and the readout of the dual-port -FIFO memory 11 between stored data and its output to the distribution device 3, which is for example a multimedia bus, which outputs data having the second frame rate via the output line 12th This data can be, for example, data with the MOST-data rate of 44,100 frames per second. This is to ensure that only complete frames are written into the memory 11 in order to synchronize with the frame synchronization signal 14 of the multimedia bus 3 is possible. At the output of the second frame from the FIFO memory 11, the second frame are outputted in synchronism with the frame synchronization signal 14 of the Verteilmittels.