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Topic: Double sideband transmission

	Sideband - Wikipedia, the free encyclopedia
		In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, containing energy as a result of the modulation process.
		Transmission in which only one sideband is transmitted is called single-sideband transmission or SSB.
		Sidebands are also what cause interference to adjacent channels, and therefore they must be suppressed by filters, either before or after modulation (or often both).
	en.wikipedia.org /wiki/Sideband (470 words)

	Double-sideband suppressed-carrier transmission - Wikipedia, the free encyclopedia
		Double-sideband suppressed-carrier transmission (DSB-SC): transmission in which (a) frequencies produced by amplitude modulation are symmetrically spaced above and below the carrier frequency and (b) the carrier level is reduced to the lowest practical level, ideally completely suppressed.
		DSB-SC transmission is a special case of Double-sideband reduced carrier transmission.
		Below, is a message signal that one may wish to modulate onto a carrier, consisting of a couple of sinusoidal components.
	en.wikipedia.org /wiki/Double-sideband_suppressed-carrier_transmission (207 words)

	The History of Single Sideband Modulation
		The lower sideband, so called because it is lower in frequency than the carrier, is shown amplified to a level approximately equal to that of the AM carrier.
		Transmission of a pilot carrier is sometimes used when precise demodulation of the received signal is required.
		In the double-sideband (DSB) system, both sidebands are transmitted, but the carrier is suppressed, unless one sideband is highly attenuated in the receiver, detection of these signals requires that the locally inserted carrier be precise with regard to both frequency and phase.
	dj4br.home.t-link.de /ssb2e.htm (734 words)

	SIGINT Systems and Products for Digital Signal Analysis (Site not responding. Last check: 2007-09-23)
		The phenomenon evidenced by the change in the observed frequency of a wave in a transmission system caused by a time rate of change in the effective length of the path of travel between the source and the point of intercept.
		The upper sideband corresponds to the sum of the carrier and modulating frequencies, whereas the lower sideband corresponds to the difference between the carrier and modulating frequencies.
		This method of transmission is extremely efficient since most of the power in the transmitted signal is in the one sideband containing the information.
	www.signami.com /glossary.html (6049 words)

	MODULATION CODES
		A1D -amplitude modulation data transmission, double sideband, without using a modulating subcarrier;
		A2D -amplitude modulation data transmission, double sideband and using a modulating subcarrier;
		J1D -amplitude modulation data transmission, single sideband, suppressed carrier, using a modulating subcarrier;
	www.ac6v.com /modcodes.htm (426 words)

	[No title]
		] Amplitude modulation in which the modulated wave is composed of a carrier, an upper sideband whose frequency is the sum of the carrier and modulation frequencies, and a lower sideband whose frequency is the difference between the carrier and modulation frequencies.
		] The transmission of a modulated carrier wave accompanied by both of the sidebands resulting from modulation; the upper sideband corresponds to the sum of the carrier and modulation frequencies, whereas the lower sideband corresponds to the difference between the carrier and modulation frequencies.
		] The radio or optical transmission path downward from a communications satellite to the earth or an aircraft, or from an aircraft to the earth.
	www.accessscience.com /Dictionary/D/D29/DictD29.html (2427 words)

	Expanded information capacity for existing communication transmission systems - Patent 6433835
		Because the television signal is vestigial sideband, it is neither all double sideband nor is it all single sideband.
		While the television transmission is dependent upon this "lock and key" relationship, certain aspects of these properties are undesirable to the transmission and reception of embedded analog and digital signals.
		This group of sidebands carry the present invention's visual data signal and is independent of the sidebands bearing the NTSC signal.
	www.freepatentsonline.com /6433835.html (18762 words)

	amod (Communications Toolbox)
		to produce the lower sideband instead of the upper sideband.
		Notice that the spectrum in the left plot has two peaks; these are the lower and the upper sidebands of the modulated signal.
		The two sidebands are symmetrical with respect to the 10 Hz carrier frequency,
	www-rohan.sdsu.edu /doc/matlab/toolbox/comm/amod.html (584 words)

	RAND \| Papers \| A comparison of single-sideband, suppressed-carrier and double-sideband, full-carrier amplitude ...
		Even in the transmission of analog signals, such as speech or music, undesirable peaks can be encountered.
		The average sideband powers and the peak envelope powers are then calculated and compared.
		The paper shows that the ratio of average sideband power to peak envelope power for AM is more favorable than that for SSB for "squarish" modulating signals.
	www.rand.org /pubs/papers/P7254 (379 words)

	[No title]
		Most VHF and UHF transmissions are subject to free space propagation, although the refractive index of the intervening air becomes important after short distances and other modes occur.
		The bulk of HF (shortwave) transmissions are propagated by the F2 layer.
		The impact of multipath is to superpose radio waves at the receiver's aerial; if two waves are displaced by an integer number of wavelengths they tend to add together and reinforce the signal, if they are a half-integer number of wavelengths apart they tend to cancel and produce a fade.
	www.euskalnet.net /migabilondo/sub2collingstheory.html (2219 words)

	The History of Single Sideband Modulation
		This tended to substantiate the concept of a composite wave and, in addition, indicated that one sideband contained all the elements necessary for voice transmission.
		Single sideband was used because of limited power capacity of the equipment and the narrow bandwidths of efficient antennas for those frequencies.
		In addition, early developments in FM transmission stimulated a belief that this mode might prove to be the ultimate in voice communication.
	dj4br.home.t-link.de /ssb1e.htm (902 words)

	Independent sideband - InfoSearchPoint.com (Site not responding. Last check: 2007-09-23)
		Independent sideband (ISB) is an AM single sideband mode which is used with AM radio transmission.
		Normally each sideband carries identical information, but ISB modulates two different input signals -- one on the upper sideband, the other on the lower sideband.
		ISB is a type of hybrid between double sideband (DSB) and single sideband (SSB), the other is vestigal sideband (VSB).
	www.infosearchpoint.com /display/ISB (146 words)

	Different Transmission Techniques (Site not responding. Last check: 2007-09-23)
		AM stands for Amplitude Modulation, and is a type of transmission, that uses a carrier wave to carry your voice.
		SSB or single sideband is another type of transmission related to AM, only it uses one sideband and not a carrier wave like AM because AM is actually DSB, which is double sideband.
		The frequency is modulated and the amplitude of the wave remains constant.
	www.roity.com /rc/cbtech1.html (263 words)

	double side band modulation
		It is also short for Double Sideband Suppressed Carrier or DSBSC.
		This is called vestigial sideband or VSB for short.
		There is a need to suppress second sideband - some TV sets have AFC error on DSB signals, aslo you will produce additional interference in multichannel systems.
	www.edaboard.com /ftopic96157.html (344 words)

	Single Sideband Modulator for LF
		These days, most SSB transmitters use the filter method where double sideband is produced with carrier balanced out and one sideband rejected by feeding the other through a steep skirted bandpass filter.
		The single sideband output is insufficient to drive the input of the transmitter and amplifier N4 raises the output level by a factor of 10.
		It is evident that sidebands A2 and B2 are in anti-phase and therefore cancel whereas A1 and B1 are in phase and additive.
	www4.tpgi.com.au /users/ldbutler/SSBModulator.htm (3186 words)

	Grundig Satellit 800 Synchronous AM (Site not responding. Last check: 2007-09-23)
		The Detector also permits selectable tuning in either the upper or lower sideband portion of an Amplitude Modulated signal.
		Since most medium wave [AM] and shortwave [SW] stations broadcasts employ a double sideband transmission mode, detection of either sideband can result in the full reception of the transmitted information.
		The selectable sideband tuning and detection not only aids reception permitting tuning into the the stronger (or less distorted) sideband, but also permits rejection of the sideband nearer to the interfering signals.
	www.universal-radio.com /catalog/portable/0800sync.html (170 words)

	boats.com - Feature: Onboard Communication
		Originally, AM signals had half of their power in a central carrier, with the other half divided equally between two sidebands, on either side — double-sideband transmission.
		Advancing technology developed single-sideband radio, a system of modulation in which the carrier and one sideband were eliminated in the transmitter without diminishing the effectiveness of the communications.
		On amateur radio bands, the lower sideband is used on frequencies lower than 10 MHz and the upper sideband on higher frequencies.
	www.boats.com /content/boat-articles.jsp?contentid=2935 (1644 words)

	Data transmission - Patent 4286333
		The present invention relates to data transmission arrangements and is particularly related to data transmission over links, such as relatively long distance links, which may be subject to interference.
		In known transmission arrangements, such as for example radio links between a number of individual units and one or more controlling or supervising units, the transmitted signals may be subject to noise as both narrow band and wide band interference.
		In such systems the fast sequence is determined under the control of a steady clock pulse train and serves effectively as a carrier in a suppressed carrier double sideband pulse-amplitude-modulated system.
	www.freepatentsonline.com /4286333.html (2931 words)

	Communications Glossary (Site not responding. Last check: 2007-09-23)
		One sideband is attenuated much more than the other with some saving in the bandwidth and transmitted power, normally used in commercial TV.
		Audio frequencies in the range essential for the transmission of speech of commercial quality, from about 300 to 3400 Hertz.
		A telegraph system that permits the transmission of several printer signals over one VGC.
	research.umbc.edu /~cellis3/glossary.html (5989 words)

	Complementary Punctured-Pair Convolutional Codes for Digital Audio Broadcasting
		Due to fading and interference in the already-crowded FM band, the signal design for the hybrid IBOC system is very challenging.
		It has been proposed to use a method of double sideband transmission where the digital information is transmitted by means of orthogonal frequency-division multiplexing (OFDM) on both sides of the analog host FM and where the digital information can be recovered when one sideband is partially or even totally lost.
		This leads to an interesting channel coding problem, where we search for optimal pairs of high-rate codes that form good combined low-rate codes,which are better than classic code combining techniques.
	www.comsoc.org /comm/private/2000/nov/1829_48comm11-chen.html (676 words)

	EE401B: Digital Transmission (Site not responding. Last check: 2007-09-23)
		To provide a basic understanding of the purpose and principles of transmission and modulation techniques used in analogue and digital communication systems.
		The need for modulation, Representation of signals, Fourier transform, transmission of signals through linear systems, representation of band-pass signals, phase and group delay.
		amplitude modulation, double sideband-suppressed carrier modulation, vestigial sideband modulation, single sideband modulation, Frequency-division multiplexing, phase modulation, frequency modulation, noise in cw modulation systems.
	www.eeap.aston.ac.uk /modules/EE401B.html (472 words)

	Fiber Optic Glossary: U, V (Site not responding. Last check: 2007-09-23)
		They have very small dimensions compared to conventional lasers and are very efficient.
		Vestigial-sideband (VSB) Transmission: A modified double-sideband transmission in which one sideband, the carrier, and only a portion of the other sideband are transmitted.
		The frequencies, ranging from 30 MHz to 300 MHz, in the electromagnetic spectrum.
	www.fiber-optics.info /glossary-uv.htm (474 words)

	General Exam License Class (Site not responding. Last check: 2007-09-23)
		What is one advantage of carrier suppression in a double-sideband phone transmission?
		(B) More power can be put into the sidebands
		(C) Double the normal peak output voltage of the power supply
	www.n2sf.com /generallic.html (526 words)

	Prof. Jenshan Lin
		Wu, F. Han, T. Horng, and J. Lin, “Direct-Conversion Quadrature Modulator MMIC Design with a New 90 Degrees Phase Shifter Including Package and PCB Effects for W-CDMA Applications,” to appear in IEEE Transactions on Microwave Theory and Techniques, Vol.
		Xiao, J. Lin, O. Boric-Lubecke, V. Lubecke, “Frequency tuning technique for remote detection of heartbeat and respiration using low-power double-sideband transmission in Ka-band,” IEEE Transactions on Microwave Theory and Techniques, Vol.
		Lin, “Wireless Power Transmission” in Energy Colloquium, University of Florida, November 1, 2004.
	www.rfsoc.ece.ufl.edu /jenshan_lin.html (4483 words)

	Lexique (Site not responding. Last check: 2007-09-23)
		DAP §2, peak to peak amplitude Double Amplitude Peak
		double beam CRT double beam Cathode Ray Tube
		double parity RAID double parity Redundant Array of Independent Disks
	doc-telecom.enst-bretagne.fr /doc-telecom/resultat.jsp?D (777 words)

	math lessons - List of telecommunications transmission terms
		math lessons - List of telecommunications transmission terms
		This is a list of telecommunications transmission terms derived from the Glossary of Telecommunication Terms published as Federal Standard 1037C.
		Please see the Federal Standard article for copyright-related issues, as not all parts of the source document are in the public domain.
	mathdaily.com /lessons/List_of_telecommunications_transmission_terms (76 words)

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