Question about Lands Phones

2 Answers

Sampling of the signal in "Analog communication".

Q no1) A signal of frequency 4 Kz is sampled at the rateof 3500Hz .What will be the effect on the signal and signal frequency ?

Posted by on

2 Answers

Please show the solution with the help of "MATHEMATICAL CALCULATION" and "RAY DIAGRAM" using sine wave.

Posted on Feb 22, 2008

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that hasĀ over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 12 Answers

The signal and signal frequency remain unchanged. In this context, these terms refer to the incoming, and not resultant, aspects of the system.

However, because the Nyquist frequency (1.75kHz, or half the sampling rate) is not greater than the signal bandwidth (4kHz), aliasing will be introduced into any reconstructed signal that is based on these samples. Not enough data about the signal has been captured to be able to recreate it in its original form.

If the signal is very simple (a sine wave, for instance), the "apparent frequency" of the result can be calculated without too much trouble. A more complex signal (i.e. a voice signal with a bandwidth of 4kHz) presents more analysis problems.

I suggest you read your textbook for further information.

Posted on Feb 14, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

I need a draft sample of letter of resignation from company to employee


SORRY that is not what we do on fixya . companies do not resign from an employee they FIRE THEM . Employees can resign but normally they just quit

Nov 23, 2016 | Lands Phones

3 Answers

AT&T 2230 2.4 GHz Dual Handset Cordless Phone - additional phones?


Hi yes you can add additional phones to it as long as their the same frequency so that they pick up the signal from the main phone that plugs into the phone line.
Im sure you can have upto 4 handsets but just make sure theis same make and frequency

Jan 29, 2008 | AT&T 2230 2.4 GHz Dual Handset Cordless...

1 Answer

Error message on all 4 handsets "No link to base Please check base" wwhow do I check please??


Always include make, model and approximate age.

Base system failures seem to occur ever more frequently and is likely due to a custom integrated radio frequency circuit that is responsible for communication with the handsets.

Replacement of the system will probably be your best choice.

Mar 12, 2015 | Lands Phones

1 Answer

Lately the phone has been losing signal and cuts out and requests intialization. Why is it doing this?


Did you move the main base recently? location will have an effect on signal strength. If that is not the case the handset is having trouble communicating with the base and this could be due the main base starting to fail, either way it is not cost effective for repair.

Jan 07, 2011 | EnGenius Phones ENG-Durafon1X-BU...

1 Answer

My Sony SPP-930 cordless phone is about 15 years old. Just recently it stopped working. The base lights work fine but when I lift the handset off the base and press TALK, all I get is 4 beeps. I bought a...


The problem is in the main base, the cordless phone is unable to communicate with the base because it has stopped working that is why you are getting the four beeps. It is more cost effective to replace the complete phone system than repair. The only other possibility "and it is long short" unplug the power and the phone line cord from the wall and let it sit at least 30 minutes, this might reset the processor ic and get your system working again.

Jan 07, 2011 | Sony SPP-930 900 MHz Analog Cordless Phone

1 Answer

Constant static and noise on the cordless, have not had this problem with other phones in the same location. I have tried the frequency scan- no difference. The noise is so bad the cordless cannot be used.


The main causes of Hissing Noise on phone line

* Weather:
Precipitation can leak into phone lines and cause disruptions. Lightning, even at a distance, can damage the connection.
Checked the connections the cable and the Sockets
If you have the Test socket or the First Socket where the Telephone is is entering .. check the Connections there

* Electrical interference:
Check the Power lines,
Check radio or television transmitters, transformers and other electronic devices may causing noise on the phone line.

* Other phone devices:
Check for the Connection to the FAX check by unpluging the FAX Machine or answering machines,
Disconnect the other phones and line splitters --
Disconnect the Splitters or devices that allow two phones to fit on one phone jack -- can cause phone line noise.

* DSL services:
The high-frequency signals coming from DSL (digital subscriber line) devices sharing the phone line can create problems for other technology connected to the line.
Note : high-frequency signals coming from DSL helps for FAST Internet Connection speed which sometime cause the problem to the Phone or Voice signals for this need to contact to ISP to check the Voice margin .. that may effect your internet Speed

IF the above wont work..

You can try keeping the device near Heater .. it could be the Moisture which might causing this issue
or
Show the Device to the Service provider to repair it






Jan 22, 2010 | GE Telephone pr521w

1 Answer

Are these phones secure to give credit card numbers over?


If your phone is operating at or above 2GHZ, as are most phones made in the last several years, the communications are out of the frequency of scanners, and the signal cannot be picked up more than about 30 feet from the phone. Secure? No, not in the purest sense of the term, but definitely safe.

Dec 12, 2009 | Vtech Digital Cordless Telephone VT-2568

1 Answer

Cannot leave a message on this phone; 28112 DECT 6.0. Have recorded a message and plays back ok. Answer to be after 4 rings, and yet phone just rings and rings. What`s wrong?


We manufacture our own exclusive replica so we oversee the production
of each handmade item. Each item is inspected before shipment to
ensure the highest quality standards.
Each handbag comes with all the accessories included in the original
item such as tags, straps, etc The pictures on our site are of a
random sampling of our stock. The item you will receive will be
identical to the item in the picture.Quality is our number one
priority. We do not manufacture an item until we have checked the
original for all the correct markings and materials.
Our company specializes in replicating designer handbags. All our
products are made with the same materials as the original handbags.
They are identical in every way right down to the serial numbers
embossed on each item.
http://www.replica-supplier.com

Jan 28, 2009 | GE 28112EE2 Cordless Phone

1 Answer

My phone has been out for some time. Just noise on my phone. the outside plug in works fine, so I assume it is my inside wiring. This morning I unplugged all my phones, and hooked them up one by one. ...


Replace the DSL filter. it is needed to in order to prevent interference between phones and DSL service operating on the same line. Without the installation of DSL filters, high-frequency signals or echoes from analog devices can result in reduced performance and connection problems with DSL service, and the high-frequency signals from the DSL service can result in line noise and other issues for analog devices.

Aug 20, 2008 | Lands Phones

2 Answers

Are mobile phones bad for our health


Since the introduction of mobile phones, concerns have been raised about the potential health impacts from regular use.[33] As mobile phone penetrations grew past fixed landline penetration levels in 1998 in Finland and from 1999 in Sweden, Denmark and Norway, the Scandinavian health authorities have run continuous long term studies of effects of mobile phone radiation effects to humans, and in particular children. Numerous studies have reported and most studies consistently report no significant relationship between mobile phone use and health. Studies from the Institute of Cancer Research, National Cancer Institute and researchers at the Danish Institute of Cancer Epidemiology in Copenhagen for example showed no link between mobile phone use and cancer.[34] The Danish study only covered analog mobile phone usage up through 1995, and subjects who started mobile phone usage after 1995 were counted as non-users in the study.[35] The health concerns have grown as mobile phone penetration rates throughout Europe reached 80%–90% levels earlier in this decade and prolonged exposure studies have been carried out in almost all European countries again most reporting no effect, and the most alarming studies only reporting a possible effect. However, a study by the International Agency for Research on Cancer of 4,500 users found a borderline statistically significant link between tumor frequency on the same side of the head as the cell phone was used on and cell phone usage.[36] One study that reviewed the link between cellphones and **** quality found that heavy mobile phone users (>4 hours per day) had significantly less viable ****(WHO morphology score was less than half of the lower time cell phone users).[37] A prospective study of 13 normal men found that significantly increasing their cell phone use (>6 hours each day for 5 days) caused a marked short-term reduction of **** quality. [38] This is considered to be a thermal effect, since the testes are vulnerable to heating by RF energy because of poor circulation and heat is known to have adverse effects on male fertility.[39] The eyes are the other part of the body known to be poor at dissipating heat. Experiments have shown that short duration exposure to very high levels of RF radiation can cause cataracts in rabbits. [40] The non-thermal effects of RF radiation are an area of active study. from wikipedia

Jan 21, 2008 | Lands Phones

Not finding what you are looking for?
Lands Phones Logo

Related Topics:

302 people viewed this question

Ask a Question

Usually answered in minutes!

Top Lands Phones Experts

kakima

Level 3 Expert

98879 Answers

Cindy Wells

Level 3 Expert

4809 Answers

yadayada
yadayada

Level 3 Expert

64052 Answers

Are you a Lands Phone Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...