Shot noise: Difference between revisions

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'''Signal-to-noise and distortion ratio''' ('''SINAD''') is a measure of the quality of a signal from a communications device, often defined as:
:<math>
\mathrm{SINAD} = \frac{P_\mathrm{signal} + P_\mathrm{noise} + P_\mathrm{distortion}}{P_\mathrm{noise} + P_\mathrm{distortion}}
</math>
where <math>P</math> is the average power of the [[signal (electronics)|signal]], [[noise]] and [[distortion]] components. SINAD is usually expressed in [[decibel|dB]] and is quoted alongside the receiver RF [[sensitivity (electronics)|sensitivity]], to give a quantitative evaluation of the receiver sensitivity. Note that with this definition, unlike [[Signal-to-noise_ratio|SNR]], a SINAD reading can never be less than 1 (i.e. it is always positive when quoted in dB).
 
When calculating the distortion, it is common to exclude the [[DC bias|DC]] components.<ref>{{citation |url=http://www.maxim-ic.com/app-notes/index.mvp/id/740 |title=Glossary of Frequently Used High-Speed Data Converter Terms |publisher=[[Maxim Integrated Products]] |date=2001-12-17 |accessdate=2011-11-05}}</ref>
 
Due to widespread use, SINAD has collected several different definitions. SINAD is commonly defined as:
 
#The ratio of (a) total received [[Power (physics)|power]], ''i.e.'', the signal to (b) the noise-plus-distortion power.  This is modeled by the equation above.{{cn|date=March 2012}}
#The ratio of (a) the power of original modulating audio signal, ''i.e.,'' from a modulated [[radio frequency]] [[carrier wave|carrier]] to (b) the residual audio power, ''i.e.,'' noise-plus-distortion powers remaining after the original modulating audio signal is removed. With this definition, it is possible to have a SINAD level less than one. This definition is used in the calculation of [[ENOB]] for an [[Analog-to-digital converter|ADC]].<ref>{{citation |url=http://www.analog.com/static/imported-files/tutorials/MT-003.pdf |title=Understand SINAD, ENOB, SNR, THD, THD + N, and SFDR so You Don't Get Lost in the Noise Floor |publisher=[[Analog Devices, Inc.]] |year=2009 |accessdate=2012-08-17}}</ref>
 
Regardless of the exact definition, it is always true that a lower SINAD value means worse performance of the system. As the received [[Radio frequency|RF]] signal becomes weaker it becomes progressively lost in the noise and distortion generated by receiver, demodulation and audio output drive circuits. By convention, the minimum acceptable SINAD level that will not swamp intelligible speech is 12dB for a narrow band [[Frequency modulation|FM]] voice radio system.{{cn|date=March 2012}}
 
==Commercial Radio Specifications==
A typical example, quoted from a commercial hand held [[VHF]] or [[UHF]] radio, might be:
 
:Receiver sensitivity: 0.25μV at 12dB SINAD
 
which is stating that the receiver will produce intelligible speech with a signal at its input as low as 0.25μV.  Radio receiver designers will test the product in a laboratory following a procedure.  A typical example procedure is as follows:
 
* With no signal present on the input, the noise and distortion of the receiver are measured at a convenient level
* A signal is applied to the input which causes the output to increase 12 dB
* The level of the signal needed to produce this is noted and is found to be 0.25 microVolts.
 
According to the radio designer, intelligible speech can be detected 12dB above the receiver's noise floor (noise and distortion). Regardless on how accurate this output power is regarding intelligible speech, having a standard output SINAD allows for easy comparison between radio receiver input sensitivities.  This value is typical for VHF commercial radio while 0.35μV is probably more typical for UHF. In the real world lower SINAD values (more noise) can still result in intelligible speech but it is tiresome work to listen to a voice in that much noise.
 
==See also==
*[[Signal-to-noise ratio]]
*[[ENOB]]
*[[Total harmonic distortion]] (THD+N)
 
==References==
{{reflist}}
 
==External links==
*[http://www.radio-electronics.com/info/rf-technology-design/rf-noise-sensitivity/sinad.php SINAD and SINAD measurements for radio receivers]
 
{{Noise}}
 
{{FS1037C MS188}}
 
[[Category:Electronics]]
[[Category:Error measures]]

Revision as of 04:25, 17 November 2013

30 year-old Entertainer or Range Artist Wesley from Drumheller, really loves vehicle, property developers properties for sale in singapore singapore and horse racing. Finds inspiration by traveling to Works of Antoni Gaudí. Signal-to-noise and distortion ratio (SINAD) is a measure of the quality of a signal from a communications device, often defined as:

SINAD=Psignal+Pnoise+PdistortionPnoise+Pdistortion

where P is the average power of the signal, noise and distortion components. SINAD is usually expressed in dB and is quoted alongside the receiver RF sensitivity, to give a quantitative evaluation of the receiver sensitivity. Note that with this definition, unlike SNR, a SINAD reading can never be less than 1 (i.e. it is always positive when quoted in dB).

When calculating the distortion, it is common to exclude the DC components.[1]

Due to widespread use, SINAD has collected several different definitions. SINAD is commonly defined as:

  1. The ratio of (a) total received power, i.e., the signal to (b) the noise-plus-distortion power. This is modeled by the equation above.Template:Cn
  2. The ratio of (a) the power of original modulating audio signal, i.e., from a modulated radio frequency carrier to (b) the residual audio power, i.e., noise-plus-distortion powers remaining after the original modulating audio signal is removed. With this definition, it is possible to have a SINAD level less than one. This definition is used in the calculation of ENOB for an ADC.[2]

Regardless of the exact definition, it is always true that a lower SINAD value means worse performance of the system. As the received RF signal becomes weaker it becomes progressively lost in the noise and distortion generated by receiver, demodulation and audio output drive circuits. By convention, the minimum acceptable SINAD level that will not swamp intelligible speech is 12dB for a narrow band FM voice radio system.Template:Cn

Commercial Radio Specifications

A typical example, quoted from a commercial hand held VHF or UHF radio, might be:

Receiver sensitivity: 0.25μV at 12dB SINAD

which is stating that the receiver will produce intelligible speech with a signal at its input as low as 0.25μV. Radio receiver designers will test the product in a laboratory following a procedure. A typical example procedure is as follows:

  • With no signal present on the input, the noise and distortion of the receiver are measured at a convenient level
  • A signal is applied to the input which causes the output to increase 12 dB
  • The level of the signal needed to produce this is noted and is found to be 0.25 microVolts.

According to the radio designer, intelligible speech can be detected 12dB above the receiver's noise floor (noise and distortion). Regardless on how accurate this output power is regarding intelligible speech, having a standard output SINAD allows for easy comparison between radio receiver input sensitivities. This value is typical for VHF commercial radio while 0.35μV is probably more typical for UHF. In the real world lower SINAD values (more noise) can still result in intelligible speech but it is tiresome work to listen to a voice in that much noise.

See also

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

External links

Template:Noise

Template:FS1037C MS188

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    Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.

    In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.

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    Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.

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