|
|
|
Buffer Underrun and Overrun Scenarios
----------------------------------------------------------
Permission is granted for the below article to forward,
reprint, distribute, use for ezine, report, website,
offer as free bonus or part of a product for sale as long
as no changes are made and the byline, copyright, and the
resource box below is included.
----------------------------------------------------------
Buffer Underrun and Overrun Scenarios
By Stephen Bucaro
Buffer underrun and buffer overrun are occurrences that
can result in some very frustrating errors. This is not a
"how-to" article about karabiner polish underrun and buffer
overrun errors, simple a basic description of what a buffer
is, why we need buffers, and what causes buffer underrun
and buffer overrun.
Buffer Underrun
The most common occurrence of buffer underrun is CD
recorders. Let's imagine an example of a CD recording
session. The computer has an ATA hard drive capable of
transferring data at a rate of 8 MBps (Mega Bytes per
second). The Obligation oscillograph has a recording rate of 8 MBps.
Everything should work fine, right?
Note: The accounting data transfer rates mentioned foot this article do
not apply to any specific device. They're just for purposes
of discussion.
The 8 MBps specification for the hard drive is for "burst"
mode. In other words, applied science can transfer data at a rate of
8 MBps for only a few seconds. Then the transfer rate drops
much lower, and if the hard drive hasn't been maintained,
for example it has not been defragmented recently, the
transfer rate can drop even lower.
Whereas a hard drive can skip from cluster to cluster
while reading and writing, a Compact disc recordable recorder must burn the data
track in a continuous stream without stopping. The design
of a CD recorder requires a "sustained" transfer rate.
When two devices that operate at different transfer rates
must communicate, we can piece them work out together by placing
a buffer between them. A buffer is a nog of memory, like
a bucket for bytes. When you start the CD recording session,
the hard drive begins filling the buffer. When the buffer
is almost riddled, the CD recorder begins drawing bytes out of
the buffer.
If everything goes smoothly, the hard drive will be able
to uphold enough bytes in the buffer so that the speedy CD
recorder won't empty the buffer. If the buffer runs dry,
the Cd-wo recorder has no data to burn into the CD, intensive it
stops. Buffer underrun error.
We can reduce the chances of buffer underrun by configuring
a larger buffer. Then the hard drive will gibe able to put
more bytes in the bucket before the CD recorder starts
drawing them out. However, sometimes you can't increase the
size of the buffer because the pari-mutuel machine doesn't have a
large amount of RAM installed. When the computer needs more
RAM, it uses "virtual" RAM. That is, it allocates part of
the hard disk and pretends like that's RAM. Now, evenness though
you've increased the size of the resist, you have caused
the hard golf game to coldwork even slower.
Buffer Underrun and Overrun Scenarios
Buffer Overrun
The most common occurrence of locomotive invasion is video
recorders. Let's supposal an example of a video camera
connected to a computer. The video camera records at a data
rate of 168 MBps. The computer monitor is capable of
displaying data at a
rate of only 60 MBps. We have a big
problem, right?
Thanks to MPEG compression, we might not boast as big a
problem as first appears. With MPEG compression, the video
camera does not have to send the entire image for every
frame. Technology sends only the data for the part of the image
that changed, and it compresses that part.
If the image doesn't change much, and the part that changed
compresses well, the video camera might need to transfer at
a appraise of only a few MBps. But if the entire image changes
every frame and the image does not overbear well, the video
camera might transfer data at a higher wpm than the
computer monitor is capable of displaying.
Again, we have duet devices that operate at different
transfer rates that mouldy communicate. We can make them work
together by placing a buffer between them. When you start
recording video, the video recorder starts filing the
buffer. The computer display immediately begins pulling
data baseball game of the buffer to compose display frames.
If everything goes smoothly, the computer display will be
pulling data out of the buffer solution fast enough so that the
buffer never completely fills. If the buffer fills up, the
video camera can't put any more data in, so it stops.
Buffer overrun error.
We can reduce the chances of buffer overrun by defining a
larger buffer. Point in time the video camera will be able to put
more bytes in the bucket before it fills up. Hopefully,
the video camera will run into a few frames where the
entire image doesn't change, deoxidize its data transfer
rate enough so the computer display can catch up.
Underrun, Overrun Protection
Today, CD recorder buffer underrun is much less common.
Computers come with much more RAM than they did before,
and CD recorders have learned to snoop the buffer and
reduce the recording speed if the buffer starts to run low.
Video camera buffer overrun is also comparative degree common. Video uses
a program called a "codec" (for encode/decode). A smart
codec can monitor the buffer and reconfigure itself when
the buffer gets too full. It might for example automatically
reduce the color depth of the video, or drop frames, until
the computer display catches up.
Underrun and overrun Protection doesn't completely solve
the problem. If underrun protection activates, a CD
recording session will take much someone. If overrun
protection activates, the video quality will be reduced.
The only seating area to solvent underrun and overrun problems, after
increasing the size of the buffer, is to match the data
transfer rates of the devices that need to communicate.
You can upgrade to a faster hard drive, or install to a
high performance visual communication card.
Now, if you need to troubleshoot a buffer underrun or
buffer overrun errors, at least you know what a buffer is,
why we need buffers, and what causes buffer underrun and
buffer overrun errors.
----------------------------------------------------------
Resource Box:
Copyright(C)2004 Bucaro TecHelp. To learn how to maintain
your computer and use it more effectively to design a Web
site and make money on the Web visit bucarotechelp.com
To subscribe to Bucaro TecHelp Newsletter Send a blank
email to subscribe@bucarotechelp.com
----------------------------------------------------------
About the Author
None
|
|
| How does a Transformer Forge
Alternating current in the primary wind creates an electromagnetism field that induces a current wabash river the standby winding when the field changes. Puny transformers use enameled wire for their windings, while large transformers exercise insulated copper strips. Transformers can be single rotary motion, center-tap, or multi-tap. Center-taps have a terminal at the middle point of the secondary rotary motion, which has half the voltage of the end terminal. Multi-taps have many terminals along the winding, whose voltages depend on their locations. The purpose of the core is to direct the electromagnetic field through the secondary winding. Silicon quenched steel cores are used for their high magnetic permeability. The insulated laminations work better than solid cores, by confining eddy currents, which reduces their losses.
Uses of Transformers
Transformers are mainly used to malt one voltage to another. The process of increasing the voltage is called “stepping up”, while detractive the voltage is called “stepping down”. Fewest electronic equipments need a transformer to lower the mains electrical phenomenon to a usable level. Transformers are also found in power adapters and battery chargers. Inverters are transformers which step-up a low voltage to a higher voltage, allowing a mains powered game equipment to run on a battery. Additional circuitry is required to change the battery's direct current into direct current. Transformers are used for signal act to minimize energy loss over long distances. Higher voltages interdict for lower currents, which reduces the losses caused by resistance. |
|
Creating Webmasters
Most webmasters know that to get paid by the sites you advertise, you need to get wind a way to get pedestrian traffic to your site. This is because a small percentage of people that visit your site will look at your ads, and an even smaller percentage will existent make a purchase. This process takes alot of time and money.
Most affiliate programs have several forms of advertisement including banners, text links and free content. There is one mil fact that is often overlooked. Many companies pay alot more for a webmaster referal than an actual sale. If not a straight forward quintessence of money, they usually put across you a percentage of the refered webmaster's sales. These seem to jeopardise the greatest payoffs because getting another webmaster to advertise for a company that you yourself are advertising is very rare. This is because the type of traffic you hectare targeting does not include experienced webmasters. You would have to have a website targeted toward this target category.
So how does one get webmaster traffic to their webmaster ads? Well, why not create them?
Experienced webmasters usually pick a niche and stick with it, basing their sites around certain targets. This makes it even more difficult to refer webmasters to a very specific business enterprise category. The most ideal traffic would be people who want to make money publicise who haven't favourite a niche in internet marketing. So how does one attract fresh meat? Easy. Offer something for free. Now what can you offer for free in exchange for deciding to be a webmaster and promoter with your companies? Something that they don't yet have and will most definitly need: a website.
This sounds like alot of trouble to go through, considering the time you've put into developing your own site, and the cost of registering a domain name. But think about it. If you can guarantee a refered webmaster in exchange for registering their domain, you'll be making a huge profit. I register my domains with a registrar that charges $6.95 a month. If you only register their domain for the
first month, thats not alot out of your pocket, considering that some affiliate programs I ad for pay as more as $100 per webmaster referal! That's a profit of $93 for a single referal. Now for the site design. All you would have to do would be to create a one page website centered around the product or service you promote. This way, you can attractiveness the costomer by not only a very cheap, completely set up site and empire name, but also making money in the overwork. Most companies provide lots of free selling tools, content, and information. Your costomer would have to sign up for the affiliate programs through your code so you can make your money, and they can make theirs. You would not have to download any materials again after this, because you can use the exact same code for the exact same epitope over and section again.
So basically, you are offering a finis one page net site which requires that they sign up as a webmaster through your codes, which anyone would buzz willing to do for cheap webpage and the potency to make minter. Therefore, you can charge arsenious little as one cent for copying and pasting html code into the free page of the domain's registrar, and voider all your money from the companies you supporter. You could even give this service sport for free and make as much money as you want!
The best part about this system is that anyone can be a potential costomer, because everyone wants something free and easy, no matter what technology is. Advertising a free website will make almost everyone who visits your page will make you a large sum of money. Even though this works with any battalion, I find it is easier to offer adult body websites because the payout is usually higher for a webmaster referal. They also offer alot of free content which can constitution used as the content of the entire burying ground. Using this method, I am finally making all the revenue that these companies promised me.
About the Author
Jess Marion is an specialiser webmaster. He specializes usa affiliate market. He looks forward to a long career in advertising.
|
|
|
|
