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Topic: Pilot tone

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	Audio-Technica - Microphones, headphones, wireless microphone systems, noise-cancelling headphones & more : Squelch ...
		This form of squelch is generally referred to as "pilot tone" or "tone coded" squelch.
		A third approach is to monitor the level of high-frequency noise at the output of the receiver detector.
		Pilot tone squelch systems can be tricked by intermodulation.
	www.audio-technica.com /cms/site/557bfecb9ab0cfee (588 words)

	A Medium Wave Audio Processor
		This 25 Hz pilot, unlike the pilot used for FM stereo, is not used in the demultiplexing process.
		Because it is low in frequency, it may take longer for the pilot detection circuitry to light the light than it does for the decode circuitry to operate - so the listener is likely to hear stereo separation before the light turns on.
		High frequency noise and the 10 kHz pilot tones are removed by the low pass filter.
	www.geocities.com /rbrucecarter/amaudio.htm (1521 words)

	Pilot - Wikipedia, the free encyclopedia
		Television pilot, often called just a pilot, is a trial episode made to sell a television series.
		Pilot light, a small outlet of gas kept continually burning and generally used to light the larger burners on the appliance
		The word pilote is, however, used for this purpose in French.
	en.wikipedia.org /wiki/Pilot (384 words)

	Pilot tone (Site not responding. Last check: 2007-10-11)
		Pilot tone is generated by a crystal in the recorder and is very stable.
		A Nagra with Pilot tone will maintain perfect lip sync with an image recorded on a sync sound camera, provided that the camera is running at a stable 24 frames per second.
		Pilot tone is recorded and played back with its own special magnetic head which places the 60 Hz sine tone out of phase with the audio sharing the same 1/4" tape.
	www.sfu.ca /sca/Manuals/ZAAPf/p/pilot_tone.html (132 words)

	Pilot use in orthogonal frequency division multiplexing based spread spectrum multiple access systems patent invention (Site not responding. Last check: 2007-10-11)
		Specifically, the symbols used in the pilots are uniquely located in a time-frequency grid, where the locations are specified by periodic pilot tone hopping sequences.
		Particular examples of pilot tone hopping sequences are parallel slope hopping sequences in which the periodicity of the sequences is chosen to be a prime number of symbol time intervals.
		Specifically, the symbols used in the pilots are uniquely located in a time-frequency grid, i.e., plane, where the locations are specified by periodic pilot tone hopping sequences.
	www.freshpatents.com /Pilot-use-in-orthogonal-frequency-division-multiplexing-based-spread-spectrum-multiple-access-systems-dt20060105ptan20060002452.php (1133 words)

	Pilot-tone calibration for time-interleaved analog-to-digital converters patent invention (Site not responding. Last check: 2007-10-11)
		The pilot signals 106 may be generated either externally or by circuitry disposed on the same integrated circuit die (or within the same integrated circuit package) as the time-interleaved ADC 100 and, at least in one embodiment, are harmonically related to the sampling clock frequency.
		In one embodiment, the magnitude of the phase correction is determined according to the magnitude of the phase error and the direction of the phase correction is determined according to whether the phase of the pilot transform leads or lags the phase angle that is midway between the phase angles of the neighboring pilot transforms.
		Alternatively, in applications where continuous presence of the pilot tone can be tolerated, the pilot can be continuously supplied in the input signal, allowing the ADC to continuously self-calibrate and thus apply gain and timing signal corrections as necessary to avoid drift (e.g., as may result from changes in voltage and temperature).
	www.freshpatents.com /Pilot-tone-calibration-for-time-interleaved-analog-to-digital-converters-dt20060323ptan20060061501.php?type=description (3415 words)

	Pilot
		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.
		Early on, pilots were normally fabricated of bars mounted on a frame; later on, sheet metal pilots were often used for their additional smoothness, and some cast steel pilots were employed for their mass and smooth shape.
	www.breadlike.com /pages7/65/pilot.html (1624 words)

	AKG WMS4000/77
		The transmitter uses a pilot tone to transmit battery status data to the receiver that displays the remaining battery capacity in hours.
		The pilot tone decoder also detects and displays other important information including the current position of the MUTE switch on the transmitter.
		A pilot tone system continuously transmits transmitter status data including MUTE switch position and the remaining battery life to the receiver.
	www.proaudiosuperstore.com /akg_wms4000-77.html (563 words)

	U.S. Patent: 5023945 - Transmission system using parallel optic links to achieve enhanced dynamic range - June 11, 1991
		Operation of the pilot tone equalization circuit 16 initially requires that a pilot tone be added to the input signal 9 to produce a composite signal which is then coupled to splitter 10.
		The pilot tone equalization circuit in each link operates in cooperation with the other circuits to equalize the delay times of the individual optical links as measured by the phase of the individually detected pilot tones.
		After signal 20 is detected by photodiode 15, the pilot tone is removed from the detected signal with a filter network 31, amplified by amplifier 32, and then split into two intermediate tone signals by splitter 33.
	www.everypatent.com /comp/pat5023945.html (3854 words)

	Restoration Tips & Notes » Synchronization
		It is somewhat problematic when reproducing on two-track heads as the pilot tone (60Hz) does not cancel out–another reason to have a full-track mono head assembly.
		Nagra, Stellavox, and Tandberg all made units capable of accepting the 60 (or 50) Hz “pilot tone” from a movie camera or crystal synch unit so that the camera motor and the tape were locked together and running at the same speed.
		On playback, the pilot tone allowed adjustment of the tape speed to accurately reflect the camera speed so when the sound was transferred to sprocketed magnetic media, the sound and picture would line up.
	www.richardhess.com /notes/formats/magnetic-media/magnetic-tapes/analog-audio/synchronization (845 words)

	kidnepro.com
		The JP-8 will send a pilot tone to your tape recorder, indicated by a double dash (— —) in the patch number display window.
		The JP-8 will soon produce a modulated tone and indicate which patch numbers are being dumped at any given moment by displaying those numbers in the lower portion of the display window.
		C- When the Jupiter-8 has dumped it’s entire memory (ending with the number 88) the pilot tone will appear again then drop to silence and the display window will become blank to indicate the end of the dump sequence.
	www.kidnepro.com /blog (4187 words)

	Zoo Pilot Design \| Web Services for Taos & the World
		The tone of this page is personal because Web site development doesn't have to be heavy or intelligible only to geeks.
		As a longtime Mac guy, writer, artist, photographer, and former Internet editor with two degrees who believes in this medium, I can talk tech or be kind.
		You're also welcome to visit my personal sites for more links and information.
	www.zoopilot.com (125 words)

	SR-15+
		By reshaping the signal, the SR-15+ eliminates amplitude distortions and input level fluctuations.
		The Stripper can extract a synchronous Pilot Tone from time code, video or power line AC.
		The Pilot Tone can be a sine wave or a square wave.
	www.brainstormtime.com /sr15.php (497 words)

	Relics - FM Stereo Transmission
		A method commonly used in (double side-band suppressed carrier) DSB-SC modulation to provide synchronisation between modulator and demodulator is to transmit a sinusoidal tone (pilot tone) whose frequency and phase are related to the carrier frequency.
		The receiver circuitry detects the pilot tone and translates it to 38 kHz, which is then used to demodulated the encoded signal.
		In the receiver, the pilot tone is filtered out and is doubled in frequency which is then used to synchronise the demodulator to the modulator.
	home.telkomsa.net /jeanward/fm_stereo.htm (848 words)

	Automatic VSB/QAM modulation recognition method and apparatus - Patent 5636250
		In order to detect the presence or absence of a VSB pilot tone, the center frequency of the sliding passband filter 122 is moved across a preselected frequency region of the received HDTV signal where it is anticipated that a VSB pilot tone will be found when the received HDTV signal is a VSB signal.
		In accordance with the second embodiment of the present invention, the VSB pilot tone detection threshold and the analysis period detection threshold are used, in conjunction with the analysis period control signal, to determine the presence or absence of a VSB pilot tone.
		By requiring that a VSB pilot tone be detected multiple times during a preselected sampling period, signal noise and other types of interference are less likely to result in a false VSB decision signal being generated than is the case with the first embodiment of the present invention.
	www.freepatentsonline.com /5636250.html (8308 words)

	CW sinus toon oscillator (Site not responding. Last check: 2007-10-11)
		It can be used for identification of an amateur station, "roger beep", 1750Hz burst, CW lessons, or as an encoder making a pilot tone (sub audible tone) for opening relay stations which use CTCSS.
		For a CTCSS tone with a frequency of 88,5Hz C1,3,4,7,8 should be changed to 198n (0,18uF+18n).
		The series resistor which determines the sub tone deviation probably could best be soldered directly onto the mid contact of the deviation potentiometer.
	www.xs4all.nl /~pa0nhc/Projects/CWtoneOscillator/cw_sine_tone_oscillator.htm (810 words)

	Stereo FM Multiplex (Site not responding. Last check: 2007-10-11)
		The 19-kHz pilot tone used by this process is still very much present.
		Old hi-fis had a "whistle filter," in case this pilot interfered with such things as the bias frequency on a tape recorder.
		This carrier is restored in the receiver by syncing to the 19-kHz pilot, which is half the frequency.
	www.ominous-valve.com /fm-mpx.html (359 words)

	Design of a Wideband Adaptive Linear Amplifier with a DSB Pilot and Complex Coherent Detection ...
		Therefore, a pilot signal is generally injected at the output of the main amplifier to facilitate the adaptive cancellation of the second loop.
		Therefore, when the power of the cancelled pilot is minimized, it means that the optimal cancellation of the second loop is obtained.
		It is obvious that the output voltage is proportional to the total power of the DSB pilot signal and is independent to the phase difference between the pilot and the LO signals.
	www.mwjournal.com /journal/article.asp?HH_ID=AR_688 (1655 words)

	Wikinfo \| FM radio (Site not responding. Last check: 2007-10-11)
		A 19 kHz pilot tone is then added, to allow allow receivers to detect the presence of a stereo-encoded signal.
		This backwards compatibility was important, as when the FM stereo system was introduced in the U.S. in the 1960s, mono FM transmissions had been in service since the 1940s, and there was a large installed base of mono receivers that needed to be able to receive stereo broadcasts without any modification.
		They were also equipped with a notch filter to remove the pilot tone.
	www.wikinfo.org /wiki.php?title=FM_radio (571 words)

	AML Wireless Systems
		The pilot tone filter rejects all the VHF signals with the exception of the pilot tone, which is then amplified in the AGC amplifier.
		The pilot tone signal is also used in the microwave AGC loop.
		The pilot tone is extracted at J12 before it goes through any AGC stages of the AGC amplifier.
	www.amlwireless.com /intro.htm (582 words)

	Technology Showcase: Wireless systems a review of wireless microphone technology
		Pilot tone muting has eliminated the problem of having a local broadcast station suddenly blasting out of the receiver when the microphone transmitter is turned off.
		This problem spawned a feature known as pilot tone muting, in which a higher-than-audible tone is broadcast along with the microphone signal.
		If the pilot tone disappears rather than receiving noise, the tone-coded receiver is muted.
	svconline.com /mag/avinstall_wireless_systems (4002 words)

	Breakng Point part 3
		Pilot, it seemed, had long ago abandoned his rather hopeless attempt to handle the spiralling whirlpool of problems himself – instead he had taken to delegating duties to the crew who had accepted these never ending assignments with the weary condemnation of the damned.
		Pilot’s response – a more restrained but none the less quite emphatic refusal – had been less than he had hoped for and so, despite the angry protests and occasional threats from his overworked shipmates, he had nonetheless set up state in the centre chamber and refused to lift a finger.
		At Pilot’s request, she had spent the day traipsing from tier to tier sealing this, and tinkering with that until her travels had brought her to this deserted hanger to investigate a possible short circuit in the fuelling system for the transport pod.
	www.purepilot.com /fanfiction/Breaking_Point_3.html (7337 words)

	Orban FM Radio Products ~ Optimod-FM 5300 Signal Flow
		Although a 16 kHz bandwidth limitation is more than is strictly needed to protect the pilot tone, the RDS requires protection over a substantially wider bandwidth (±2 kHz), and 16 kHz provides this protection.
		Protecting the pilot tone and subcarrier regions is particularly difficult with a conventional composite clipper because appropriate filters will not only add overshoot but also compromise stereo separation — filtering causes the single-channel composite waveform to “lift off the baseline.”
		While the processing never clips the pilot tone, the extra spectrum generated by the processing can fall into the 19 kHz region, compromising the ability of receivers to recover the pilot tone cleanly.
	www.orban.com /products/radio/fm/5300/signal_flow (1128 words)

	ADI - Analog Dialogue \| BTSC Encoder
		This pilot signal is used by the receiver to recover the double-sideband suppressed-carrier (DSBSC) modulated stereo-difference (L – R) audio channel at 2H, and the SAP and PRO channels at 5H and 6.5H.
		Thus, this BTSC pilot feedback clock-synthesis method will provide a more accurate master clock than a conventional fractional-N PLL clock, since the master clock will be generated directly with the correct frequency feedback ratio.
		A BTSC pilot from the secondary channel of a dual BTSC encoder is continuously compared with the NTSC horizontal sync rate (15.734 kHz) to derive a self-sustaining stable master clock frequency of 12.288 MHz.
	www.analog.com /library/analogDialogue/archives/39-07/btsc.html (2222 words)

	Recording/playback apparatus using a single pilot tone for active tracking and control of a video disc pickup device ...
		The pilot signal is recorded on an information track of a video disc record such that each convolution of the track contains a non-integral number of cycles of the pilot signal.
		The phase of the pilot signal in a given convolution bears a known relationship to the phase of the pilot signals in the convolutions preceding and succeeding the given convolution.
		The phase of the recovered reference signal is compared to the phase of the recovered pilot signal which may include phase information from adjacent convolutions to provide an error signal.
	www.delphion.com /details?pn=US04213148__ (367 words)

	Pilot Modems
		Pilot can simulate DTR line but this is not used at this moment (needs a pull-up)
		I took the standard 4 foot pilot modem cable and cut it to make the whole package smaller.
		This is defiantly not the modem I want to keep for mail it is much too slow but it works that was my intention to make it a truly portable e-mail machine.
	www.massena.com /darrin/pilot/luiz/item10.htm (258 words)

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