Digital signal
hideThe term digital signal is used to refer to more than one concept. It can refer to discrete-time signals that have a discrete number of levels, for example a sampled and quantified analog signal, or to the continuous-time waveform signals in a digital system, representing a bit-stream. In the first case, a signal that is generated by means of a digital modulation method is considered as converted to an analog signal, while it is considered as a digital signal in the second case.
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News tagged with digital signals
Explained: The Discrete Fourier Transform
14 hours ago |
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(PhysOrg.com) -- In 1811, Joseph Fourier, the 43-year-old prefect of the French district of Isčre, entered a competition in heat research sponsored by the French Academy of Sciences. The paper he submitted ...
Don't change that channel: DTV woes still abound
Sep 18, 2009 |
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(AP) -- Think the digital TV transition is over? Not quite. Many viewers have found that they can't pick up certain stations after the switch, even with the right TVs or converter boxes. The stations are still trying to ...
Friday is last day to apply for digital TV coupon
Jul 30, 2009 |
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(AP) -- The government program that provides $40 coupons for digital TV converter boxes is winding down.
Reception problems linger after DTV transition
Jun 17, 2009 |
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(AP) -- The shutdown of U.S. analog TV service on Friday appears to have gone relatively smoothly, but as expected, a lot of viewers are having problems getting the stations they want.
700,000 callers phone digital TV hot line
Jun 13, 2009 |
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(AP) -- Nearly 700,000 calls were received by a federal hot line this week from people confused about the nationwide switch from analog to digital TV broadcasts that occurred Friday.
Friday is final curtain for analog TV signals
Jun 10, 2009 |
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(AP) -- The last major TV stations that are still broadcasting in analog will turn those signals off Friday and go all digital. And this time, they really mean it.
Analog TV signals to be interrupted in 'soft test'
May 20, 2009 |
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(AP) -- TV stations around the country will replace their analog broadcasts for a few minutes Thursday with reminders that those broadcasts will disappear completely in three weeks.
Hubble to receive high-tech James Webb Space Telescope technology
Space & Earth / Space Exploration
May 08, 2009 |
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Scientists and engineers now creating new technologies for NASA's James Webb Space Telescope, have realized they can be used to enhance the Hubble's Advanced Camera for Surveys (ACS) in the upcoming servicing ...
New 167-processor chip is super-fast, ultra energy-efficient
Apr 22, 2009 |
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A new, extremely energy-efficient processor chip that provides breakthrough speeds for a variety of computing tasks has been designed by a group at the University of California, Davis. The chip, dubbed AsAP, is ultra-small, ...
Stations must warn if new TV signals lack reach
Mar 16, 2009 |
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(AP) -- TV stations must alert viewers if their new digital signals don't reach areas covered by their soon-to-be-defunct analog broadcasts, the Federal Communications Commission has ruled.
