Digital Signal
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Advantages of Digital Signal Processing (DSP) over Host Media Processing (HMP) in Media Applications
In today's telecom market, media processing platforms – such as Session Border Controllers (SBCs), gateways, and transcoders – require high performance and low latency in order to support real-time applications. Most platforms depend on Digital Signal Processors (DSPs) or Host Media Processors (HMPs) to provide this support.
Based on information provided by leading HMP software vendors and independent testing labs, DSP-based solutions proved to be significantly more efficient than HMP-based solutions. The major findings of their research are highlighted in this document.
DSP-based solutions provide performance levels 8 times higher than HMP solutions in video processing applications and 9-10 times higher in voice processing applications. The measurements were performed in lab environments between comparable DSP and HMP platforms for voice and video transcoding applications.
CAPEX and OPEX figures show much better results for DSP based systems. Power and space comparisons in a telecom infrastructure deployment show that a DSP based solution consumes over 20 times less rack space then an HMP solution while the power consumption is over 20 times less. The security and maintenance needs of HMP systems require additional investment in software and maintenance than those of DSP-based systems.
In real time voice and video applications, the latency has a major impact on the quality. HMP-based media processing systems introduce significantly higher latency than those of DSP-based systems. The reason includes the optimized and media processing tailored frameworks in the DSP based systems, on one hand, and the operating systems, the kernel level development complexity and the co-location of the media processing and the application on the same host in the HMP based systems, on the other.
In NGN/IMS networks, the IP interface is natively used; however the connectivity to the legacy PSTN network is required. When utilizing a DSP based system, PSTN interfaces can be added easily, due to the native TDM interfaces of the DSP based media processing sub-system. On the other hand, an HMP based media server does not have a native TDM interface. Therefore, in order to interface with the PSTN, additional effort and equipment (i.e. gateways) are required.
In conclusion, when comparing media processing platforms for the telecom industry, DSP-based system offer major advantages over HMP-based systems.
For more detailed information, see the white paper, "SURF advantage over BMP".
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Why You Should Get An HDTV By 2009
Get An HDTV By 2009
By {February} 17, 2009, there'll be a junior reform in the method we watch TV in the United States. The FCC, the government bureau that contains TV televised norms, is going to insist on all over-the-air broadcasts to be in a digital format instead of analog. This switch won't distress nearly everyone, but anyone who is still using an "analog only" television series would be compelled to raise their TV.
The basis why it is a substantial deal has to do with compatibility. In the very commencement of TV distribution, everything was publicized in black and white, which was acceptable because every TV was a white and black television.
Afterward in 1953, the FCC accepted a set of standards itemizing how color television will be put on air and how color TV sets would serve. The fine thing regarding these standards was that they're backwards-compatible: you can still make use of your old black-and-white set to watch the modern color broadcasts. They wouldn't be colored on your TV, certainly, however in any case you could watch them.
The new digital customs, on the other hand, will not be backwards-compatible. If your set couldn't grasp a digital signal, it is just gonna be an expensive paperweight. The fair news is that it is painless to figure out if your set is able to tolerate digital signals, and if not, you will just have to screw a digital-to-analog converter box to let everything perform.
If you have been deliberating {about} raising to a modern HDTV (High Definition Television) anyhow, all HDTVs would take digital input, accordingly right away is as fine a time as any to assume the dive.
If you are skeptical regarding your TV, look for the term "digital" everywhere on the set, as in "digital tuner", "digital receiver", "DTV", or "ATSC". If you find any of these markings on the set, it could most likely process digital, and you'd just need to find the setting on your TV or remote that sets the input to digital.
If you own an analog-only set and you don't like a fresh TV, you will want a converter box in 2009. Fortuitously, the administration has made the Digital-to-Analog Converter Box Coupon Program to address such an issue. Every house in America can get up to 2 $40 coupons for the acquisition of a box. Visit DTV2009 for points on this program and The FCC's DTV Page for information on the format change in general.
The more exciting method to sort out the switch, though, is to upgrade your TV to the latest and greatest technology. HDTV information proliferates on the net. A splendid means to get a handle on it is to visit an HDTV tutorial website to get your directions and make a secure choice on your purchase. You would like to be established with terms like Plasma, LCD, 1080p resolution, HDMI cables, and lots more previous to giving over your cash.
We can recommend you Samsung LN52B750 but if Samsung LN52B750 doesn't suits your needs consider other Samsung LCD TV Reviews.
What resolution is the "over the air" digital signal?
I just bought a new TV for the main purpose of HD gaming. I am unable to afford cable/satellite at the moment, so for watching TV, I'm going to have to resort to basic channels using the "over the air" digital signal. Do networks broadcast their signal in 1080p? It'd be nice to catch some sports in HD.
Over the air digital HDTV: 720p or 1080i.
(OTA digital SD: 480p)
Most broadcasters have chosen 1080i, but Fox and ABC have chosen 720p. 720p is better for sports and other fast-moving video than 1080i, which is why cable sports network ESPN chose 720p for their HD.
Broadcasters and cablecasters use 1080i, not 1080p, because of bandwidth limitations.
HD gaming and Blu-Ray players can use 1080p, because they get to use a whole HDMI cable (or set of component cables) for themselves alone. They don't have to share broadcast frequency spectrum with other broadcasters, or share cable bandwidth with other cablecasters.
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TechBits 13 - Analog and Digital Signals
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