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NxM switch using distributed RAM

A random access memory and router technology, applied in the field of routing or switching systems for non-packet signals, can solve problems such as increasing signal attenuation and interfering with physical channel frequencies

Inactive Publication Date: 2003-03-19
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, each connected device must be connected to a physical channel, where there is interference and signal attenuation caused by increased frequency of the physical channel

Method used

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  • NxM switch using distributed RAM
  • NxM switch using distributed RAM
  • NxM switch using distributed RAM

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0010] Detailed Description of Preferred Embodiments

[0011] refer to figure 1 , the signal on the split physical channel 185 reaches the corresponding time division multiplexer 180 (usually a signal converter) of the switch 70 . Multiplexer 180 multiplexes several separate signals arriving on corresponding physical channels 185 and outputs them on corresponding channels 190 . Channel 190 may be connected to a bus 150 and simultaneously read into each of several random access memories 145 (RAM). RAM 145 along with data from bus 150 is simultaneously mapped into data blocks of arbitrary size, each data block containing one bit from each physical channel 185 in one embodiment. While one block of data is being written, another block of data is being read. The data blocks may correspond to any area of ​​memory and be reused, whereby write and read operations are alternately performed on a given data block.

[0012] Each RAM 145 is read by a corresponding addressing controller...

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Abstract

A signal router routes N inputs to M outputs. All inputs signals are ultimately applied to a data bus by spreading across multiple buss lines and time multiplexing. The data are read from the bus and written in identical images to K random access memories. The memories are addressed and read according to a different schedule for each of K output signals that are ultimately demultiplexed to M outputs. As each RAM image is read, another RAM image is written and vice versa. Since each RAM image contains the same data, the generation of signals from each RAM to supply each of the respective K output signals can be done at a rate that is substantially more independent of the input, bus, or RAM write operations than prior art techniques permit.

Description

technical field [0001] This invention relates to routing or switching systems for non-packetized signals. More particularly, the present invention relates to systems for providing signals from a selected one of N sources to a selected one of M sinks. Background technique [0002] In a broadcast system, video and audio data are transmitted between N originating sources and M sinks. Due to the need for data synchronization, such a system cannot easily rely on packet network technology. The source can be a recording to a CD player, live broadcast, digital video file, etc. Control of broadcast facilities involves rapid switching between multiple such sources and sinks. Three types of routers are currently used in such systems: space-division multiplexing, time-division multiplexing, and a combination of the two. In space division multiplexing, as in conventional telephone switching systems, different physical channels are formed between the source and the sink. In time divis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/00H04N7/08H04N7/081H04Q11/04
CPCH04Q11/04H04Q2213/13299H04Q2213/13292H04Q2213/13341H04Q2213/1334H04Q2213/13103H04L12/28
Inventor C·克里斯藤森
Owner KONINK PHILIPS ELECTRONICS NV
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