Multimedia signal processing system
View Patent ↗A multimedia signal processing system utilizes an easily manipulated, low-cost storage and display system that allows the user to view a television program and instantly review previous scenes within the program. The invention also allows the user to store selected programs while simultaneously watching or reviewing another. A versatile system architecture enables providing the invention in multiple configurations, each adapted to receive input signals from a different source. At the highest level, the system includes an input section and an output section. Across all configurations, the output section remains substantially the same, while the input section varies according to the signal type and the source. Thus, several configurations are provided, each one requiring only minor system board modifications. The system architecture thus simplifies the design and manufacturing challenge presented by producing units to serve different markets, such as digital satellite, digital cable and analog cable.
1. A system for the simultaneous storage and retrieval of multimedia data, comprising:
an input section that acquires an input signal, the input section creates a transport stream from the input signal;
a processor;
a decoder subsystem that decodes the transport stream, the decoder subsystem is communicatively connected to the processor;
a media switch communicatively connected to the decoder subsystem, the media switch operative to interface a plurality of system components and operates asynchronously from the processor, wherein the media switch includes:
a host controller;
a DMA controller;
a bus arbiter; and
a multimedia data stream processor; and
a storage subsystem communicatively connected to the media switch, wherein multimedia data are stored on the storage subsystem and retrieved from the storage subsystem essentially simultaneously.
2. The system of claim 1 , wherein the input section is adapted to accept a digital satellite input signal.
3. The system of claim 1 , wherein the input section comprises:
at least one satellite tuner; and
at least one demodulating element to demodulate the digital satellite signal to a transport stream.
4. The system of claim 1 , wherein the input section is adapted to accept an input signal in both analog and digital formats from at least one RF coaxial connector.
5. The system of claim 4 , wherein the input section comprises:
at least one tuner for selecting a desired channel;
at least one decoder for digitizing a video component of the input signal;
at least one sound processor for processing an audio component of the input signal into a digitized audio component;
an encoder having multi-stream encode capability, wherein the encoder receives the digitized video and audio components, whereupon the digitized video and audio components are encoded and multiplexed into a transport stream.
6. The system of claim 1 , the decoder subsystem further comprising a transport stream decoder/graphics subsystem.
7. The system of claim 6 , wherein the transport stream decoder/graphics subsystem includes at least one of:
a host bridge;
a memory controller;
an MPEG-3 transport demultiplexer;
an MPEG-3 decoder;
an audio/video decoder;
a graphics processor;
a bus bridge; or
a bus controller.
8. The system of claim 7 , the transport stream decoder/graphics subsystem further comprising at least one transport stream interface, wherein the transport stream interface receives the transport stream from the input section.
9. The system of claim 7 , wherein the transport stream is demultiplexed into audio and video packet streams, wherein the audio and video packet streams are stored and played back through an output side of the transport stream decoder/graphics subsystem.
10. The system of claim 7 , further comprising a SDRAM connected to the transport stream decoder/graphics subsystem.
11. The system of claim 1 , wherein the processor is operative to run system software, middleware, and application software.
12. The system of claim 1 , wherein the media switch is implemented in an ASIC (Application Specific Integrated Circuit) or a programmable logic device.
13. The system of claim 1 , further comprising a front panel navigation cluster coupled to a GPIO (General Purpose Input/Output) included in the media switch.
14. The system of claim 11 , wherein the system software includes at least: an operating system kernel and device drivers, the system software operative to initialize and control hardware components.