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The quality of a signal is a measure
of how much the signal has changed during transmission.
A high quality signal has changed very little.
A low quality signal has other information in it
which was not there in the original signal.
The additional unwanted information is called noise.
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∙ 14y ago
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What is targeted sampling in research studies?
I would like to sample the signal Xa(t) =1+cos(10 *pi*t) using sampling frequency fs=8 Hz. How can I calculate this? ANSWER: Your signal has a frequency component of 5hz (from the equation: 2*pi*f*t = 10*pi*t, therefore f=5). The Nyquist rate for this signal (the minimum sampling rate required to reconstruct the signal) is then 10Hz, and even at that rate the amplitude of the sampled signal will be reduced unless you can somehow synchronize the sampling with the peaks/troughs of the cosine signal. If you sample at 8Hz you will not be able to reconstruct the signal at all.
What is pitch period?
The pitch period of a signal is the fundamental period of the signal, or in other words, the time interval on which the signal repeats itself. The pitch frequency is the inverse of the pitch period, which is the fundamental frequency of the signal.
How would you use the word 'signal' in a sentence?
One if by land and two if by sea is the signal you shall set for me! The signal's yellow light was more green than red, officer! Semaphore utilizes signal flags.
Can you use signal word in a sentence?
The crossing guard sent a signal to the children.
Why is reflection of signal useful?
Reflection of a transmitted signal is the basic premise of radar and sonar.
How effective is a cable TV signal booster in terms of picture quality?
TV signal boosters will significantly improve the picture quality of your TV if the poor quality you are currently experiencing is due to signal degradation. If the cable signal is poor from the source, a signal booster will not help.
What are some brands of quality phone signal boosters?
There are a few different brands of quality signal boosters for cellular phones. Some of the companies that make quality signal boosters are Wilson Electronics and Wireless Extender.
Will a strong signal reception result in a clear digital television pictures?
Digital signals require a certain signal strength and quality to be received reliably. Above that threshold, the signal will be received without data loss and there will be no increase in image quality as a result of an increased signal strength. As the signal quality decreases below the quality threshold, errors in the data stream will be noticed as a disturbed area of an image, no sound or a static image for short periods of time. When the quality of the signal decreases further, the image and sound will fail completely.
Does a bi-directional cable splitter improve signal quality to a tv?
Cable splitters, joiners, adapters and similar products will never improve signal quality.
Do you need a stronger signal for digital TV or for analog TV?
There are two answers to the question - Digital or analog. Here is the reason why: Digital signal are very robust signals as long as they do not fall below a certain strength and quality. As long as the signal is above that threshold, a receiver should be able to interpret the data correctly. That means a full quality image even though the signal may only just be above the strength and quality threshold. Analog signals need a higher signal strength and quality to achieve full quality images at the receiver. As the signal strength and quality reduce, more noise and other distortion can be detected in the image. Despite this, a signal strength and quality far lower than an equivalent digital signal will still be received. The image may be degraded to the point where noise is intrusive, but the content can still be seen. Broadcasters take into account the differing requirements of digital television and will make efforts to ensure that the signals received are of sufficient quality to provide reliable programs. It is perhaps worth pointing out that signal strength and signal quality are two separate measurements. Quality is just as important as strength so signal strength alone will not guarantee good reception in all cases.
Can you split a component video signal?
Yes. But you will lose signal quality (decreased brightness and increased interference) without an amplifier.
What is VoIP testing?
Checking VoIP latency and voice quality and signal transmission.
What tool would you use to assess the quality of a wireless signal?
spectrum analyzer
What will a picture look like on an High Def TV with out High Def signal?
The bottom line on the quallity of your picture is the quality of your input signal. A clear, noiseless, high quality non HD input to a HD TV will look great. (There have been studies which show that non-expert viewers will not readily be able to distinguish high-quality non-HD signals from HD signals). A pasty, lossy, low-quality signal will look terrible whether it is HD or non HD (it may even look worse in HD). A HD TV will usually give you a better picture - whatever the quality of your input signal. But the better your input signal - the more improvement you will see.
Will a set top box improve signal quality for your TV?
Set top box is basically used to convert the digital signals broadcasted by digital signal broadcasters to analog signals, in case you wish to have your analog tv, but would like to have an access to digital channels. Digital channels definitely have better quality signals than analog and therefore you will have a better picture quality and signal quality even though you have converted the digital signals to analog.
How much signal do you lose on a thousand feet of cable?
There are many factors that contribute to signal loss over a length of cable. The major factors are the frequency of the signal and the inherent losses of the cable. Cable quality is vital to ensure good signal transmission. Another important factor is the quality of the cable driver and the receiver. Additionally, the practical effect of signal loss varies depending on whether the signal is analog or digital. As the cable length increases, the signal voltage will decrease and the high frequency signals will be reduced more than lower frequencies. In an analog video signal, the visible result will be soft edges, smearing the image. Despite that, the signal will still remain valid even though a quality loss will be seen. With a digital signal, the receiver will continue to interpret the signal correctly until a certain level of signal loss is present. Once that level is reached, the picture will show some significant errors and very quickly will fail completely. A good quality digital cable receiver will adjust itself to capture a poor quality of signal but such receivers tend to be found only in professional level equipment. There are wide variations in signal losses but some typical maximum cable lengths are: Composite analog SD video with high quality co-ax cable - 1000 feet Composite analog SD video with economy cable - less than 50 feet SD digital video SDI (Broadcast format signal) - 1000 feet HD digital video SDI (Broadcast format signal) - 300 feet VGA analog signal on high quality co-ax cables - 300 feet VGA analog signal on economy cables - 30 feet HDMI on good quality cable - 75 feet HDMI on economy cable - 20 feet Optical fiber - thousands of feet up to miles
Suppose that the quality of a phone signal degrades due to quantization noise once it is digitized?
assigning too few quantization intervals during sampling of the signal
