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Topic: Vestigial sideband modulation

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Vestigial sideband

Amplitude modulation

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Modulation

Frequency modulation

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	Modulation
		Modulation describes a range of techniques for encoding information on a carrier signal, typically a sine-wave signal.
		A device that performs modulation is known as a modulator.
		Modulation is frequently used in conjunction with various channel access methods.
	www.ebroadcast.com.au /lookup/encyclopedia/mo/Modulation.html (157 words)

	Concatenated coded vestigial sideband modulation for high definition television - United States Patent 5,398,073
		A modulation scheme for HDTV, for example, uses a concatenated code comprised of a Reed-Solomon coder followed by an N-dimensional trellis coder whose N-dimensional output symbols with N>1, are used to modulate a one-dimensional vestigial sideband modulator.
		The VSB modulator uses an eight-symbol, one-dimensional constellation, so that for each successive transmission symbol period, the concatenated coder, responsive to the source-coded HDTV signal bit stream, identifies to the modulator a particular one of the eight one-dimensional VSB symbols to be transmitted.
		The VSB signal generated by modulator 15 are applied to a television channel, such as an over-the-air channel or a cable, and are received by the receiver of FIG.
	xrint.com /patents/us/5398073 (4495 words)

	Amplitude modulation Summary
		Amplitude modulation (AM) is a form of modulation in which the amplitude of a carrier wave is varied in direct proportion to that of a modulating signal.
		Each sideband is equal in bandwidth to that of the modulating signal and is a mirror image of the other.
		An approach which marries the advantages of low-level modulation with the efficiency of a Class C power amplifier chain is to arrange a feedback system to compensate for the substantial distortion of the AM envelope.
	www.bookrags.com /Amplitude_modulation (1573 words)

	Modulation (Site not responding. Last check: 2007-10-13)
		Modulation is the process where a Radio Frequency or Light Wave's amplitude, frequency, or phase is changed in order to transmit intelligence.
		Vestigial Sideband modulation is a lot like Single Sideband, except that the carrier frequency is preserved and one of the sidebands is eliminated through filtering.
		In Pulse Amplitude Modulation, a pulse is generated with an amplitude corresponding to that of the modulating waveform.
	telecom.tbi.net /mod1.html (797 words)

	Single-sideband modulation
		Single-sideband modulation (SSB) is a refinement of the technique of amplitude modulation designed to be more efficient in its use of power and bandwidth.
		Amplitude modulation typically produces a modulated output signal that has twice the bandwidth of the modulating signal, with a significant power component at the original carrier frequency.
		This will have two frequency-shifted copies of the modulated signal (the lower one is frequency-inverted) on either side of the remaining carrier signal.
	www.ebroadcast.com.au /lookup/encyclopedia/ve/Vestigial_sideband_modulation.html (344 words)

	Principles of Modulation (Site not responding. Last check: 2007-10-13)
		Modulation is the process needed to make a radio frequency wave carry a signal that conveys some sort of information (or intelligence).
		Various forms of amplitude modulation are used: double sideband full carrier (or conventional AM, used by broadcasters); single sideband (or SSB, used by radio amateurs, utility users and some broadcasters; vestigial sideband (wideband TV and some digital signals, seldom seen on Shortwave).
		Digital signals use frequency modulation in distinct steps (often two) so that a stream of digital symbols is transmitted; this is known as frequency shift keying (FSK) and is used by radio amateurs and utilities.
	radioscanning.wox.org /Scanner/other_info/principles_of_modulation.htm (517 words)

	Device and method for digital vestigial sideband modulation - Patent 5801595
		VSB modulation is proposed by the Grand Alliance for the American standard for future broadcast of DTV.
		As will be developed in the discussion of preferred embodiments, the device and method of vestigial sideband modulation herein may include the provision of an input digital signal (not limited to a DTV signal) at a rate 1/T to a multiplier which downconverts the input signal by multiplying it by e.sup.-j(2.pi./4T)t.
		The factor e.sup.j(2.pi./4T)t accounts for the shaping filter's offset from the carrier by one-fourth the symbol rate of the modulator, and the factor e.sup.j.omega..sbsp.0.sup.t represents the translation of the baseband spectrum to the vestigial sideband carrier frequency.omega..sub.0, which is also the pilot frequency.
	www.freepatentsonline.com /5801595.html (2849 words)

	Digital, frequency-translated, plural-channel, vestigial sideband television communication system - United States ...
		Television communication systems presently employ vestigial sideband (hereinafter referred to as VSB), or asymmetric-sideband, modulation wherein a portion of one sideband (usually the lower sideband) is largely suppressed.
		At a headend terminal 10, radio frequency signals from a remote RF transmitter carrying the VSB television signals are received for transmission by the headend terminal 10 to a distribution terminal 13, geographically separated from the headend terminal 10.
		LED 29 is thereby modulated in accordance with the multiplexed digital representations of the baseband-shifted VSB channels and its optical output is applied to optical fiber 31 by way of an apropriate optical fiber coupler fixture, shown by broken lines 30.
	xrint.com /patents/us/4183054 (3591 words)

	Broadcast television system - Wikipedia Mirror (Site not responding. Last check: 2007-10-13)
		In positive modulation, the maximum luminance value is represented by the maximum electrical signal; in negative modulation, the maximum luminance value is represented by a zero electrical signal.
		All analogue television systems use vestigial sideband modulation, a form of amplitude modulation in which the lower sideband is incompletely suppressed.
		At the time television was developed, the vestigial sideband was easier to accomplish than true single-sideband modulation; with today's technology, there is no reason for it except to be compatible with existing technology.
	www.wiki-mirror.be /index.php/Broadcast_television_system (2221 words)

	Analyzing the Signal Quality of NTSC and ATSC Television RF Signals
		Sideband signal energy is created above and below the video carrier as it is amplitude modulated with the composite video signal.
		The sideband signal energy below the carrier is limited to 1.25 MHz by the transmitter’s vestigial sideband filter.
		FM audio sidebands are contained in a 200 kHz bandwidth of the carrier frequency.
	www.sencore.com /newsletter/Nov03/HDTV_files/HDTV.htm (2288 words)

	U.S. Patent: 5786870 - NTSC video signal receivers with reduced sensitivity to interference from co-channel digital ...
		The vestigial sideband amplitude-modulation signal is selected from any single one of a plurality of channels at least one of which is subject to containing at times co-channel interference from a digital television signal.
		The vestigial sideband amplitude-modulation signal as supplied to this circuitry for recovering higher frequency portions of the video signal is selectively filtered to remove the pilot carrier signal component of any co-channel digital television signal.
		Whether the linear combiner 19 is an adder or a subtractor depends on the whether the operation of the quadrature-phase synchronous detector is chosen to lead the operation of the in-phase synchronous detector or to lag it.
	www.everypatent.com /comp/pat5786870.html (5577 words)

	8VSB - Wikipedia, the free encyclopedia
		8VSB is the 8-level vestigial sideband modulation method adopted for terrestrial broadcast of the ATSC digital television standard in the United States and Canada.
		The eight signal levels are selected with the use of a trellis encoder.
		However, the FCC has always held that 8VSB is the better modulation for use in U.S. digital television broadcasting.
	en.wikipedia.org /wiki/8VSB (742 words)

	vestigial sideband - a definition from Whatis.com
		Vestigial sideband (VSB) is a type of amplitude modulation (AM) technique (sometimes called VSB-AM) that encodes data by varying the amplitude of a single carrier frequency.
		Portions of one of the redundant sidebands are removed to form a vestigial sideband signal - so-called because a vestige of the sideband remains.
		Instead, the modulating data appears in the form of signal components at frequencies slightly higher and lower than that of the carrier.
	whatis.techtarget.com /definition/0,,sid9_gci332235,00.html (268 words)

	Modulators
		A module is a self-contained component of a system, which has a well-defined interface to the other components; something is modular if it is constructed so as to facilitate easy assembly, flexible arrangement, and/or repair of the components.
		One of the three key characteristics of a signal are usually modulated: its phase, frequency or amplitude.
		A device that performs modulation is known as a modulator and a device that performs demodulation is known as a demodulator.
	www.breadlike.com /pages7/55/modulators.html (586 words)

	Zenith: HDTV
		A low-level pilot is employed for carrier acquisition, a data segment sync for synchronizing the data clock in both frequency and phase, and a data frame sync for data framing and equalizer training.
		After modulation, the DC value causes an in-phase pilot to be added to the data spectrum for transmission.
		Also, since VSB modulation is used, only one real equalizer filter is required running at the full data rate; not two complex (four cross-coupled) filters as with QAM systems.
	www.zenith.com /sub_hdtv/hdtv_papers_atsc_system.html (8205 words)

	Easy Fourier Analysis
		In single sideband modulation, we filter out the lower or the upper band to separate out these signals as if they were two independent signals.
		Modulation index larger that 100% distorts the signal so an envelope detector can not be used to demodulate it any longer.
		Use of SSB modulation would cut this in half but SSB is not used for video signals because of the complexity of the SSB receivers.
	www.complextoreal.com /base.htm (3857 words)

	8VSB Information - 8vsb modulation information (Site not responding. Last check: 2007-10-13)
		8VSB is the 8-level vestigial sideband modulation method adopted for terrestrial broadcast of the ATSC 8vsb modulation information digital television standard in the United States and Canada.
		In the 6 megahertz channel used for broadcast ATSC, 8VSB carries 19.39 megabits of usable data per second, although the actual transmitted bitrate 8vsb decoder is significantly higher due to the addition of forward error correction codes.
		However, the FCC has continued to assert that 8VSB is the better modulation for use in U.S. digital television broadcasting.
	www.inanot.com /Ina-Electronics_Topics_Num_-_A-/8VSB.html (735 words)

	[No title]
		Carrierless Amplitude Phase Modulation (CAP) is a variant of QAM; this modulation scheme is only in use for ADSL, since it offers significantly inferior performance, albeit at a reduced cost, over DMT.
		AM (Amplitude Modulation) is essentially a mixing process where the audio "modulating" signal is mixed with the radio frequency "carrier".
		The resulting signal actually consists of three distinct components: the carrier, the upper sideband (carrier frequency plus the audio modulating frequency) and the lower sideband (carrier frequency minus the audio modulating frequency).
	www.lycos.com /info/amplitude-modulation.html (268 words)

	COURSE TITLE: ECE C07 Analog Communications
		The outputs of the modulator and demodulator are viewed in the time and frequency domains.
		The output of the modulator is viewed in the time and frequency domains, and performance of the demodulator is observed.
		Estimate the bandwidth of a phase or frequency modulated waveform.
	www.ece.northwestern.edu /courses/307.html (664 words)

	The educational encyclopedia, radio, tuner, modulation techniques
		FM stereo FM modulation used in the 88 to 108MHz band takes a signal with frequency range ~50Hz to ~15kHz and modulates a carrier in the FM band with a modulation index of ~5.
		Frequency modulation frequency modulation, the differences between AM and angle modulation, the relationship between FM and PM, Calculate modulation index, signal bandwidth, sideband frequencies and power levels, frequency spectra of an FM signal, FM transmitter, the differences between AM and FM superheterodyne receivers, including capture effect, noise threshold, and pre-emphasis and de-emphasis, FM demodulation techniques,
		IQ modulation IQ modulation, modulation technique that lends itself well to digital processes is called "IQ Modulation", where "I" is the "in-phase" component of the waveform, and "Q" represents the quadrature component
	www.educypedia.be /electronics/modulationtopics.htm (603 words)

	E E 367
		First, analog amplitude modulation (AM) is presented, covering double-sideband suppressed carrier, double-sideband large carrier, single sideband, and vestigial sideband modulation formats.
		Second, analog angle modulation is presented in the forms of frequency modulation (FM) and phase modulation (PM).
		Estimating the bandwidth of the angle modulated carrier is covered, as well as various generation and detection methods.
	www.psu.edu /bulletins/bluebook/long/e_e/367.htm (413 words)

	[No title] (Site not responding. Last check: 2007-10-13)
		Modulation describes a range of techniques for encoding information on a carrier signal, typically a
		When transmitting digital data, modulation normally involves shifting one or more properties of the carrier wave between a set of states, a process referred to as keying.
		Modulation is frequently used in conjunction with various
	www.brujula.net /english/wiki/Modulation.html (150 words)

	8VSB is the 8 level vestigial sideband modulation vestigial sideband... (Site not responding. Last check: 2007-10-13)
		"8VSB" is the 8-level vestigial sideband modulation vestigial sideband modulation method adopted for ATSC ATSC standard of digital television digital television in the USA USA.
		There has been a continuing lobby for changing the modulation modulation for ATSC ATSC to COFDM COFDM instead, the way DVB-T DVB-T is transmitted in Europe Europe, and ISDB-T ISDB-T in Japan Japan.
		However, the FCC FCC has continued to assert that 8VSB is the better modulation for use in U.S. digital television broadcasting.
	www.biodatabase.de /8VSB (283 words)

	Amplitude Modulation compare, review and contact US businesses at usbusinessfinder.com
		As originally developed for the electric telephone, amplitude modulation was used to add audio information to the low-powered direct current flowing from a telephone transmitter to a receiver.
		As a simplified explanation, at the transmitting end, a telephone microphone was used to vary the strength of the transmitted current, according to the frequency and loudness of the sounds received.
		In contrast to the telephone, in radio communication what is modulated is a continuous wave radio signal (carrier wave) produced by a radio transmitter.
	www.usbusinessfinder.biz /amplitude-modulation.html (836 words)

	Amazon.com: "vestigial sideband": Key Phrase page (Site not responding. Last check: 2007-10-13)
		Vestigial sideband amplitude modulation (VSB-AM) 45 ulating signal.
		The modulated carrier and the phasor representation of Eqn.
		Vestigial sideband amplitude modulation was used with a carrier frequency of 2,400 Hz.
	www.amazon.com /phrase/vestigial-sideband (507 words)

	VPIphotonics - VPItransmissionMaker™WDM Features (Site not responding. Last check: 2007-10-13)
		Vestigial Sideband (VSB) systems offer increased spectral efficiency by filtering the transmitted (or received) spectrum so that one sideband of the modulated optical carrier dominates over the other.
		However, there are many trade-offs in the design of the optical filters that impact heavily on the benefits of VSB modulation.
		Recent work has shown that near-optimum filters can be designed using careful considerations of the nonlinear nature of optical modulation.
	www.virtualphotonics.com /feature_tour/VestigialSideband.html (90 words)

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