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Topic: Pilot signal

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  Apparatus for cancelling a pilot signal from a composite signal (US4731844)
The composite signal and a synthesized pilot signal are coupled to the minuend and subtrahend input connections of the subtraction circuit respectively.
A sinusoidal signal, also developed by the oscillator and in phase with the pilot signal is applied to a second multiplier.
The amplitude signal is multiplied by a sinusoid in phase with the pilot signal in a third multiplier to generate the synthesized pilot signal.
www.delphion.com /details?pn10=US04731844   (418 words)

  Pilot signal - Wikipedia, the free encyclopedia
In telecommunication, a pilot is a signal, usually a single frequency, transmitted over a communications system for supervisory, control, equalization, continuity, synchronization, or reference purposes.
In FM stereo broadcasting, a pilot tone of 19 kHz is used to indicate that there is stereophonic information on a subcarrier at 38 kHz (19×2, the second harmonic of the pilot).
A guard band of ±4 kHz (15-23 kHz) is used to protect the pilot tone from interference from the baseband audio signal (50 Hz-15 kHz), and from the lower sideband of the stereo subcarrier (23-53 kHz).
en.wikipedia.org /wiki/Pilot_signal   (279 words)

 Pilot - Wikipedia, the free encyclopedia
Pilot is the name of a pop music group best known for their 1975 top-20 hit song "Magic".
Many appliances that use natural gas or propane as their fuel utilize a pilot light, which is a small outlet of gas kept continually burning and generally used to light the larger burners on the appliance.
In telecommunications, a pilot signal (or pilot tone) is used as an indicator, such as to indicate the presence of FM stereo or AM stereo.
en.wikipedia.org /wiki/Pilot   (417 words)

 Pilot signal detection system using band reject filter - US Patent 5986499   (Site not responding. Last check: 2007-10-03)
The pilot signal with distortion at the output of the coupler 28 is fed to gain & phase circuit 34 whose output is fed to amplifier 36 whose output is applied to coupler 38.
The amplitude of the pilot signal is typically relatively small at the output of the feed forward distortion reduction system because of the cancellation of the pilot and the relative amplitude of the pilot signal with respect to the amplitude of the in-band carrier signal(s).
The pilot signal and the carrier signal on the main signal path 16 are applied to the amplifier 12 whose output comprises the amplified signal S, the amplified pilot signal P and distortion D produced by the amplifier 12.
www.patentstorm.us /patents/5986499.html   (4610 words)

 EPA Brownfields Assessment Pilot - Signal Hill, CA
These pilot programs are intended to provide EPA, states, tribes, municipalities, and communities with useful information and strategies as they continue to seek new methods to promote a unified approach to site assessment, environmental cleanup, and redevelopment.
Signal Hill, in southern California, has a population of 9,133, with 40 percent being minorities.
Pilot funding will be used for assessment, restoration planning, and community outreach.
www.epa.gov /swerosps/bf/html-doc/asignalh.htm   (593 words)

 Dual pilot phase lock loop for radio frequency transmission - Patent 4618996
At the receiver the pilot signal is compared to the local oscillator in a phase-locked loop that synchronizes the local oscillator frequency to the pilot frequency.
From the microwave transmitter 15 the signal is passed to an antenna 16 for transmission to a remote receiver.
By translating the pilot signals to a lower frequency range, it is easier to achieve the separation of the individual pilot tones from each other.
www.freepatentsonline.com /4618996.html   (3233 words)

 Signal Aviation - Flight School - Cessna Pilot Center - Advanced Flight Training
Signal's flight school can easily accommodate your advanced flight training needs with our FAA approved Part 141 programs.
Signal is authorized under FAR Part 141 to train instrument pilots in thirty-five hours rather than the standard forty.
Signal now offers several short courses designed to make pilots comfortable with specific aircraft operations and more complex avionics and instrumentation.
www.signalaviation.com /Flight_School/advanced_training.htm   (274 words)

 Digital signal reproducing apparatus with capstan servo control based on adjacent track pilot signal crosstalk ...   (Site not responding. Last check: 2007-10-03)
This signal is used for the purpose of detecting the levels of crosstalk resulting from the two tracks adjacent to the track being reproduced, so as to obtain the difference between the levels of such crosstalk as a tracking error signal.
The signal in zone I is due to the pilot signal on the on-track, and those in zones II and III result from the crosstalk of the pilot signal on a track with the odd-number frame (B) and a track with the even-number frame (B), respectively.
Based on the level of this pilot signal on the on-track, the difference between the levels of crosstalk of pilot signals from the two adjacent tracks is adjusted in such a way as to compensate for the variation in the difference in crosstalk levels due to the difference in output level for each rotary head.
www.patentstorm.us /patents/4890173.html   (12058 words)

 Pilot Flags   (Site not responding. Last check: 2007-10-03)
In 1899 the International Code of Signals Committee wrote; "We recommended that flag S when hoisted alone should be an international pilot signal signifying 'I want a pilot.' At present the single flag signal to be used by British vessels requiring a pilot is the Union Jack with a white border.
We gather that foreign maritime powers are generally agreed as to the desirability of there being an internationally recognised single-flag signal for a pilot and we are of the opinion that flag S (blue centre with white border) is well adapted for the purpose.
The white-bordered Union Jack ceased to be a signal for a pilot in 1970, which obviously removes one objection to its use as a civil jack.
www.crwflags.com /fotw/flags/xf-pilt.html   (2196 words)

 Pilot signal -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-03)
The third harmonic of the pilot (19×3, or 57 kHz) is used for (additional info and facts about Radio Data System) Radio Data System.
In (A television that transmits images in color) color television, the (additional info and facts about color burst) color burst placed between each video field is the pilot signal to indicate that there are color subcarriers present.
Most radio relay systems use radio or continuity pilots of their own but transmit also the pilot frequencies belonging to the (additional info and facts about carrier frequency) carrier frequency multiplex system.
www.absoluteastronomy.com /encyclopedia/p/pi/pilot_signal.htm   (191 words)

 RFA300 Measurements
Because the signal is noise-like, it is not possible to narrow the bandwidth and lower the signal amplitudes to extend the dynamic range like it is with sine wave-type signals (as you narrow the bandwidth the noise-like signal falls in amplitude also).
To compute the curve, the gain of the signal a few constellation units from the origin is considered to be the correct value and variations elsewhere are shown with reference to this nominal value.
Likewise, the 8-VSB signal is measured in constellation units, where one constellation unit is the distance between the origin and the first constellation state along the real axis (with the pilot offset removed) regardless of its absolute amplitude in volts.
www.tek.com /Measurement/Support/video_audio/faq/rfa300/q_a.html   (1570 words)

 (WO 03/090373) DYNAMIC PILOT FILTER BANDWIDTH ESTIMATION   (Site not responding. Last check: 2007-10-03)
An incoming signal containing a pilot signal is filtered using non-identical filters, and the magnitudes of the filtered signals are compared to estimate a bandwidth of the pilot signal.
Based on the comparison of the filtered signal magnitudes, which may be compensated to remove the noise contribution, the parameters of a filter applied to the incoming signal to isolate the pilot signal are varied.
The non-identical filters used in the pilot signal bandwidth estimation may be IIR or FIR filters having different passbands, or may be a correlation of the incoming signal with sinusoids of different frequencies.
wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=03/90373.031030&...   (229 words)

 LCC International, Inc.   (Site not responding. Last check: 2007-10-03)
This measurement essentially ignores the overall strength of the signal and instead concentrates on how much better the desired pilot signal is to the noise that conspires to interfere with it.
The pilot scanners can be used in the base stations installation process to determine how the cells are working together, what the effects of interference between base stations are on the noise floor, how well the neighbour lists are optimised, etc. This work could be done well before the deployment of services.
The number of pilot signals with significant power that results in pilot pollution is determined by the number of fingers in the Rake receiver.
www.lcc.com /ABOUT/MEDIA/wp2.htm   (1087 words)

 Doering Company - Catalog Supplement 903.01
Air is supplied to the pilot solenoid valves continuously and passes through to the Doering valves when an electronic signal is sent to the pilot solenoid valve.
Pilot solenoid valves may be normally open or normally closed depending on the functionality that you are seeking.
As the pilot signal pressure decreases, the downstream pressure decreases.
www.doering.com /903.html   (499 words)

 VW Tech -- Electrical -- Turn Signal/Hazard Flasher Circuits
If the pilot light alternates with the external signal lights, that is, when the signal lights are on, the pilot light will be off, and visa-versa, then you probably have a flasher relay that doesn't work like the OEM relay.
The turn signal circuit is activated when the turn signal switch on the steering column is moved to either the up (right) or down (left) position.
If you connect the smaller pilot light bulb in series with the larger signal light bulb (as they actually are in your vehicle) and connect them to a battery, you'll notice that only the pilot light bulb lights up.
www.blueglue.com /vw/tech/elec/flasher-post68.html   (1242 words)

 Pilot signal transmission in a multi-transmit antenna wireless communication system page
Pilot indicators passed by dissimilar antennas in a wireless communication system utilizing manifold pass antennas аre distinguished utilizing dissimilar codes.
The pilot signal frоm the first antenna is encoded with a first соde suсh as a Walsh соde and the pilot signal frоm the subsequent antenna is encoded with a dissimilar соde suсh as a dissimilar Walsh соde.
The dissimilar codes allow a receiver to distinguish the pilot signals while they аre reсeived to allow coherent deteсtiоn of indicators passed by together of the antennas.
www.patentalert.com /docs/001/z00168939.shtml   (199 words)

 Discussion about the dimensions of the pilot jack   (Site not responding. Last check: 2007-10-03)
The White-Bordered Signal Jack was adopted as a signal flag by the Royal Navy in 1826 and continued in use until 1948 when the white border appears to have been about 1/7th of the breadth of the flag, as seen on this image showing International Mike over Signal Jack on HMS Comus, August 1946.
Later, the fact that the flag, as a pilot signal, had been more square than oblong was forgotten, and it was assumed that it had always existed in its elongated form.
The white-bordered Union Jack was still a legal signal for a pilot, and remained so until 1970, but I doubt that many ships bothered to carry a special flag, that could be used only as a pilot signal, when one of the International Code flags could be used instead.
www.crwflags.com /fotw/flags/gb-jkpl2.html   (1594 words)

 Timing recovery using the pilot signal in high definition TV page
Timing recovery using the pilot signal in high definition TV Improved саrrier recovery and symboI timing systems and methоds linear for utilize in connection with a dual-mode QAM/VSB receiver arrangement is described.
An inрut spectrum is centered concerning baseband and the pilot is extrаcted by an correspondent fiIter whiсh funсtiоns as a bandpass filter hаving pass bands centered concerning the pilot incidence.
Since the pilot signal's incidence is given, its роsitiоn in the incidence domain for every example incidence, is deterministic.
www.patentalert.com /docs/001/z00123674.shtml   (369 words)

 Method for using a non-orthogonal pilot signal with data channel interference cancellation invention
This is accomplished by regenerating interference terms with respect to the non-orthogonal pilot signal and subtracting them from the demodulated data signal.
To separate out the signals for a particular user at a receiver, cross correlation is performed on the received signal using the same unique user code sequence.
Here, the signal-to noise is the energy per chip per interference density, or E.sub.c/I.sub.0 where E.sub.c is the energy per chip and I.sub.0 is the interference density.
www.freshpatents.com /Method-for-using-a-non-orthogonal-pilot-signal-with-data-channel-interference-cancellation-dt20061026ptan20060239335.php   (2922 words)

 (WO 2005/018100) PILOT SIGNAL ENHANCEMENTS FOR A WIRELESS COMMUNICATION SYSTEM   (Site not responding. Last check: 2007-10-03)
Modulation of a pilot signal frame may be limited to ensure early detection, and/or to minimize impairment of pilot functionality.
In one embodiment, a Secondary Pilot Channel (SPICH) is transmitted at one of several selectable power levels to boost effectiveness of a phase reference, and is modulated to indicate the selected level.
Pilot signal frames may be transmitted at a predetermined level during a detection preamble portion of a frame to endure accurate and early detection, and at a more optimal level thereafter.
www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=05/18100.050224   (288 words)

 The Steamboat Pilot: Signal Path plays a loop   (Site not responding. Last check: 2007-10-03)
In many ways, Signal Path is the sound of a jam band searching for a way out of the jam band scene.
On stage, Signal Path's music bounces between three laptops, two sets of drums, a line of effects pedals and a full light show.
Signal Path will be in Steamboat Springs this weekend as part of a five-week tour that took the band from Montana to the West Coast and ends with a Sound Tribe Sector Nine show called the Area 51 Sound Test outside of Las Vegas.
www.steamboatpilot.com /section/news/storypr/26010   (390 words)

 [No title]
This versatile signal can function as an alarm for flame-out, as a trigger for auto ignition systems, as a regulator of fuel gas usage, and for recording/reporting purposes.
A positive signal is provided when pilots are burning and zero when extinguished.
The continuous output signal indicating pilot flame status can be used for reporting/recording purposes to comply with EPA regulations for flarestack pilot operations.
www.powertrol.com /pilotmon.htm   (407 words)

 Title page for ETD etd-4198-173859
It is critical that the percentage of power allocated to the pilot signal transmitted by each base station be fixed properly to ensure the ability of the CDMA network to support subscriber demand.
Since the pseudonoise (PN) signal of the pilot channel is a priori information, the receiver searches for pilot signals by digitally correlating the received signal with this known, locally generated pilot signal.
Because the period of the pilot signal is relatively long, methods were developed to keep the receiver's update period as small as possible without compromising its detection ability.
scholar.lib.vt.edu /theses/available/etd-4198-173859   (437 words)

 Pilot Point Post Signal
The Pilot Point Post-Signal has been serving Northeast Denton County, Texas, and surrounding counties for more than 100 years.
The newspaper was founded as the Pilot Point Post on August 31,1878.
Through a series of mergers, it became known as the Pilot Point Post-Signal in November 1898 and has published under that name since.
www.postsignal.com /about.htm   (213 words)

 Basics of Stereo Multiplexing for FM Transmission
There is also the issue of somehow adding a tiny signal in the MPX signal that informs the Receiver that the incoming signal is in Stereo, so it should decode information higher than 15 KHz as that's not just Audio, it is the L-R signal hidden somehow.
The 38 KHz signal generated by the Receiver will be in phase with the 19 KHz pilot tone, so in case the Transmitter uses a 38 KHz Subcarrier in phase with the Pilot Tone, the Receiver would be able to exactly regenerate the missing AM SubCarrier.
As a 30 KHz signal is 8 KHz away from the 38 KHz AM carrier, a stereo receiver would be within its rights to reproduce a 8 KHz tone during decoding process.
members.tripod.com /~transmitters/stereo.htm   (4087 words)

 The Steamboat Pilot: Camps signal season   (Site not responding. Last check: 2007-10-03)
In August, the former ABL star moved to Steamboat to take a job as a resource teacher and girls basketball coach at the high school.
The camps signal the start of the high school winter season at Steamboat.
Schools are not permitted to hold mandatory practices until Saturday, and the basketball, wrestling, hockey and skiing season are expected to begin in Steamboat on Monday.
steamboatpilot.com /section/sports/storypr/26742   (393 words)

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