Frequency-shift keying

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	Frequency-shift keying - Wikipedia, the free encyclopedia
		Frequency-shift keying (FSK) is a form of frequency modulation in which the modulating signal shifts the output frequency between predetermined values.
		Usually, the instantaneous frequency is shifted between two discrete values termed the mark frequency and the space frequency.
		Other names for FSK are frequency-shift modulation and frequency-shift signaling.
	en.wikipedia.org /wiki/Frequency-shift_keying (432 words)

	FSK - Frequency-Shift Keying
		Frequency Shift Keying; a frequency modulation in which the modulating signal shifts the output frequency between predetermined values.
		Frequency shifts between the two frequencies are generated when the binary digital level changes.
		The use of frequency modulation to transmit digital data, i.e.
	www.auditmypc.com /acronym/FSK.asp (533 words)

	Audio frequency-shift keying - Wikipedia, the free encyclopedia
		Audio frequency-shift keying (AFSK) is a modulation technique by which digital data is represented as changes in the frequency (pitch) of an audio tone, yielding an encoded signal suitable for transmission via radio or telephone.
		AFSK differs from regular frequency-shift keying in that the modulation is performed at baseband frequencies.
		Most early telephone-line modems used audio frequency-shift keying to send and receive data, up to rates of about 300 bits per second.
	en.wikipedia.org /wiki/Audio_frequency-shift_keying (339 words)

	FSK demodulating device - Patent 4897857
		Frequency shift keying signal b input to FSK demodulating device 8 is converted into voltage signal c by detector 9 and discriminated to obtain the original digital data signal d by demodulator 10.
		Frequency shift keying signal b output through the radio channel from antenna 5 is received by antenna 6 at a receiving side.
		Digital data signal a is modulated to frequency shift keying (FSK) signal b by voltage-controlled oscillator 3.
	www.freepatentsonline.com /4897857.html (3172 words)

	04687.000127&ELEMENT_SET=DECL
		FSK has been used to modulate unique codes or other information onto frequency signals for remotely controlling systems such as vehicle remote keyless entry systems, garage door openers, estate gate openers, home security systems, etc. The unique codes may be encrypted or rolled.
		In further accordance with the present invention, a radio frequency transmitter circuit is provided having a user input switch for producing an input signal, an oscillator for producing a frequency signal having a first frequency, and an antenna connected to the oscillator for broadcasting the frequency signal.
		Preferably, the base frequency 38 is demodulated to correspond to a digital value of one and the coupled frequency 40 is demodulated to correspond to a digital value of zero.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=00/04687.000127&ELEMENT_SET=DECL (2098 words)

	Hybrid frequency shift keying modulator and method - Patent 4878035
		A hybrid frequency shift keying modulator and method produces binary FSK by simultaneously applying a digital modulating signal to the DDS section of a frequency synthesizer along with a coordinated analog modulating signal as direct frequency modulation of the accompanying PLL section.
		FSK is a fundamental digital modulation mode of broad application throughout the communications industry, particularly in the field of land-mobile signalling as a means of selectively addressing radio receivers (binary-coded squelch), and for digital transmission of messages to radio paging receivers.
		High frequency response and wave shape reproduction of the input signal are maintained by modulation of the PLL section of the frequency synthesizer and low frequency response is maintained by modulation of the DDS section.
	www.freepatentsonline.com /4878035.html (4797 words)

	FSK - Frequency Shift Keying
		In Frequency Shift Keying the carrier frequency is shifted between distinct frequencies.
		A common shift pattern is between two frequencies one representing a zero and the other a one.
	www.mpirical.com /companion/Transmission/FSKKeying.htm (29 words)

	59170.001005&ELEMENT_SET=DECL
		The method according to claim 7 wherein the duration of the frequency shift keying of the output signal is continuous and of short duration whereby the output signal is phase modulated in response to receiving the differential pulse pairs.
		The method according to claim 5 wherein the duration of the frequency shift keying of the output signal is continuous and of short duration whereby the output signal is phase modulated in response to receiving the differential pulse pairs.
		wherein the duration of the frequency shift of the output signal is continuous and of short duration whereby the output signal is phase modulated in response to receiving the differential pulse pairs.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=00/59170.001005&ELEMENT_SET=DECL (7959 words)

	Angle and pulse modulation
		In frequency modulation an audio signal is used to shift the frequency of an oscillator at an audio rate.
		The frequency shift may be set at plus or minus 425 hertz from the allocated channel frequency.
		The upper frequency of the transmitted signal is usually the spacing interval and the lower frequency is the marking interval.
	www.tpub.com /neets/book12/49.htm (607 words)

	rv09com2.txt
		721-06-06 frequency shift keying; frequency shift modulation; frequency shift signalling; FSK (abbreviation) Angle modulation in which the frequency of a periodic sinusoidal oscillation is varied between a set of dis- crete values, each value representing a significant condition of a modulating discretely-timed signal.
		09.05.16 PSK, phase shift keying 702-06-40 phase shift keying; PSK (abbreviation); phase shift modulation; phase shift signalling Angle modulation in which each significant condition in a discretely timed modulating signal is represented by a specified difference between the phase of the modulated signal and the phase of the carrier in the ab- sence of modulation.
		721-06-08 differential phase shift keying; DPSK (abbreviation) Angle modulation in which each significant condition in a modulating discretely-timed signal is represented by a discrete change of phase of the modulated wave relative to the phase during the preceding signal ele- ment.
	www.fh-frankfurt.de /~jacobson/WG7/rv09com2.txt (6821 words)

	Frequency Shift Keying (FSK)
		Frequency shifting a carrier between known fixed frequencies to convey digital data.
		Normally, FSK modulation is achieved using just two frequencies to represent binary data.
		FSK signals can be heard in the HF amateur bands around 14100 kHz, 21150 kHz and in numerous other places in the band.
	www.scnt01426.pwp.blueyonder.co.uk /Articles/Modulation/FSK.htm (413 words)

	frequency-shift keying - a Whatis.com definition - see also: FSK
		Frequency-shift keying (FSK) is a method of transmitting digital signals.
		Logic 0 is represented by a wave at a specific frequency, and logic 1 is represented by a wave at a different frequency.
		The FSK mode was introduced for use with mechanical teleprinters in the mid-1900s.
	searchnetworking.techtarget.com /sDefinition/0,,sid7_gci213936,00.html (312 words)

	Data Modulation Devices (MODEMs)
		For the carrier frequency of 1080 Hz, a Space is represented by a 1180 Hz signal and a Mark is represented by a 980 Hz signal.
		For the carrier frequency of 1750 Hz, a Space is represented by a 1850 Hz signal and a Mark is represented by a 1650 Hz signal.
		A Mark is represented by a frequency of 1200 Hz, while a Space is represented by a frequency of 2200 Hz.
	telecom.tbi.net /modem.html (1807 words)

	Definition: frequency-shift keying
		frequency-shift keying (FSK): Frequency modulation in which the modulating signal shifts the output frequency between predetermined values.
		Note 1: Usually, the instantaneous frequency is shifted between two discrete values termed the " mark " and "space" frequencies.
		Note 2: Coherent forms of FSK exist in which there is no phase discontinuity in the output signal.
	www.its.bldrdoc.gov /projects/devglossary/_frequency-shift_keying.html (72 words)

	MSK - Minimum Shift Keying
		Minimum Shift Keying is a form of FSK (Frequency Shift Keying) used to carry digital information on a radio carrier.
	www.mpirical.com /companion/Transmission/MSKKeying.htm (20 words)

	Frequency-shift keying (from telecommunication) -- Encyclopædia Britannica
		If frequency is the parameter chosen to be a function of the information signal, the modulation method is called frequency-shift keying (FSK).
		In the simplest form of FSK signaling, shown in Figure 3, digital data is transmitted using one of two frequencies, whereby one frequency is used to transmit a 1 and the other frequency to transmit a 0.
		Its activities include maintaining order in the allocation of radio frequencies, setting standards on technical and operational matters, and assisting countries in developing their own telecommunication systems.
	www.britannica.com /eb/article-76282 (656 words)

	Chapter 3
		In phase-shift keying, the frequency and amplitude of the carrier signal are kept constant, but the carrier is shifted in phase according to the input data stream.
		In frequency-shift keying (FSK), the frequency of a fixed amplitude carrier signal is changed according to the binary stream of data to be transmitted.
		Figure 3.7 The digital modulated waveforms of a NRZ binary input.
	www.2bengineer.net /qpsk/chapter3.html (1753 words)

	MFSK - a Whatis.com definition - see also: MFSK16, multi-frequency shift keying, multiple frequency shift keying
		MFSK (multiple frequency shift keying), also called multi-frequency shift keying, is a method of signal modulation in which discrete audio tone bursts of various frequencies convey digital data.
		MFSK is similar to frequency shift keying (FSK), but more than two frequencies are used.
		The disadvantages of MFSK include the fact that the signal bandwidth for a given data speed is larger than with binary codes, and the adjustment of the receiving equipment is critical.
	searchnetworking.techtarget.com /sDefinition/0,,sid7_gci1037334,00.html (410 words)

	Keying Tone -
		In frequency shift keying, a different tone (frequency) is used for the...
		quency Shift Keying (FSK) is known to be a capacity-achieving...
		controlled amplifier which is modulated with a keying envelope.
	tone.fmqg.com /index.php?k=keying-tone (997 words)

	High-Tech Dictionary Definition
		(FSK).Frequency modulation of a carrier signal by a digital signal, in which changes in frequency represent 0s and 1s.
	www.computeruser.com /resources/dictionary/definition.html?lookup=2313 (19 words)

	Keying Schemes
		Frequency Shift Keying (FSK) stands for the process of keying between two different frequencies as shown in figure 9.
		Phase Shift Keying (PSK) is a technique for switching phases in response to the signal.
		Of course one could also key the amplitude, but this is what we already called PAM.
	robotics.eecs.berkeley.edu /~sastry/ee20/modulation/node7.html (209 words)

	Frequency Shift Keying
		Summary: Frequency Shift Keying uses the bit to affect the frequency of a carrier sinusiod.
		This signal set is known as frequency shift keying or FSK.
		A different signal set from the previous two uses the bit to affect the frequency of a carrier sinusoid.
	cnx.rice.edu /content/m0545/2.5 (330 words)

	Definition: multiple frequency-shift keying
		multiple frequency-shift keying (MFSK): Frequency-shift keying (FSK) in which multiple codes are used in the transmission of digital signals.
		Note: In MFSK, the coding schemes use multiple frequencies that are transmitted concurrently or sequentially.
	www.atis.org /tg2k/_multiple_frequency-shift_keying.html (71 words)

	Frequency Shift Keying
		Frequency-shift keying is the simplest (binary) form of frequency modulation (FM), which is used for digital modulation in which the two binary values are represented by two different frequencies near the carrier frequency.
		Please also contact Argos Press Pty Ltd to seek permission to broadcast, adapt, reproduce and communicate this site's content (such as this entry on Frequency Shift Keying).
		Normally the carrier is shifted low for a 1 (called a mark in old telegraph terms) and high for a 0 (space).
	www.argospress.com /Resources/gsm/frequeshiftykeiin.htm (157 words)

	Frequency-Shift Keying for Ultrawideband (ResearchIndex)
		Abstract: In wideband systems that decorrelate in time and frequency, capacity can be reached in the limit of infinite bandwidth by using impulsive frequency-shift keying (FSK) with vanishingly small duty cycle.
		1 Maximizing channel capacity in fsk modulation systems (context) - Gao, Soderstrand et al.
		We show that FSK with small duty cycle can achieve rates of the order of capacity in ultrawideband systems with limits on bandwidth and peak power....
	citeseer.ist.psu.edu /671246.html (377 words)

	ipedia.com: Radioteletype Article
		RTTY used a variety of different modulation methods, of which frequency shift keying was the most common.
		RTTY used a variety of different modulation methods, of which frequency shift keying was the most co...
		The combination of low baud rate with robust FSK modulation made RTTY highly resistant to most forms of radio interference, second only to Morse code.
	www.ipedia.com /radioteletype.html (194 words)

	Toggling Between Two Pulse Train Frequencies (Frequency Shift Keying) - Tutorial - Development Library - National Instruments
		This application is known as frequency shift keying (FSK).
		Toggling Between Two Pulse Train Frequencies (Frequency Shift Keying)
		In FSK, the counter generates a pulse train of one frequency and duty cycle when the gate is low, and it generates a pulse train with a second set of parameters when the gate is high.
	zone.ni.com /devzone/conceptd.nsf/webmain/D926B3E67F647C7986256802007B8530?opendocument&node=DZ52328_US (348 words)

	frequency-shift keying transmission method using two differe
		A transmission method using two different frequencies that are shifted to represent the digital zeros and ones; used in some common modems.
		A few months ago we were approached by a company wanting us to update their existing website with a fresher look and make it more optimised towards search engines to increase sales.
	www.ssiltd.co.uk /glossary/details.asp?item=350 (254 words)

	Definition: double-frequency shift keying
		double-frequency shift keying (DFSK): Frequency-shift keying in which two telegraph signals are multiplexed and transmitted simultaneously by frequency shifting among four frequencies.
	www.its.bldrdoc.gov /fs-1037/dir-012/_1789.htm (37 words)

	ECS EPrints Service - Overlapping $M$-ary Frequency Shift Keying Spread-Spectrum Multiple-Access Systems using Random Signature Sequences
		In contrast to previous work typically assuming that the frequency shift keying (FSK) tones are nonoverlapping after direct-sequence (DS) spreading, here we consider a spread-spectrum multiple-access (SSMA) system under the assumption that the DS spread signals of different FSK tones are only orthogonal over the information symbol duration.
		In this paper, a multiple-access spread-spectrum communication system using binary frequency shift keying (BFSK) or
		Consequently, the frequency band of a spread FSK tone may be fully or partially overlapping with the other spread signals.
	eprints.ecs.soton.ac.uk /2247 (308 words)

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