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Topic: Preemphasis network

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Federal Standard 1037C

	Preemphasis improvement - Wikipedia, the free encyclopedia
		In FM broadcasting, preemphasis improvement is the improvement in the signal-to-noise ratio of the high-frequency portion of the baseband, i.e., modulating, signal, which improvement results from passing the modulating signal through a preemphasis network.
		Preemphasis increases the magnitude of the higher signal frequencies, thereby improving the signal-to-noise ratio.
		At the output of the discriminator in the FM receiver, a deemphasis network restores the original signal power distribution.
	en.wikipedia.org /wiki/Preemphasis_improvement (93 words)

	Preemphasis network - Wikipedia, the free encyclopedia
		In telecommunication, a preemphasis network is a network inserted in a system in order to increase the magnitude of one range of frequencies with respect to another.
		Note: Preemphasis is usually employed in FM or phase modulation transmitters to equalize the modulating signal drive power in terms of deviation ratio.
		The receiver demodulation process includes a reciprocal network, called a deemphasis network, to restore the original signal power distribution.
	en.wikipedia.org /wiki/Preemphasis_network (103 words)

	Video disc systems with plural preemphasis/deemphasis networks - Patent 4385326
		The preemphasis network is of a type having a non-linear phase characteristic and an amplitude response characteristic which increases by a predetermined amount over a lower portion of the luminance signal frequency band and assumes a substantially constant level over an upper portion of the luminance signal frequency band.
		The output of delay element 50 is applied to a lead-lag type of preemphasis network 52 and clipped by means of an interactive clipper circuit 54 prior to summation with the buried subcarrier chrominance signal in summing circuit 28.
		Network 52 is of a type having a non-linear phase characteristic and an amplitude response characteristic which increase by a predetermined amount over a lower portion of the luminance signal frequency band and assumes a substantially constant level over an upper portion of the luminance signal frequency band.
	www.freepatentsonline.com /4385326.html (7113 words)

	Video signal processing apparatus - Patent 4316210
		Apparatus as recited in claim 1 wherein said preemphasis means comprises a first preemphasis network interposed between an output of said circuit means and an input of said clipping means and a second preemphasis network connected in cascade with said delay means.
		Conventionally, the luminance signal is subjected to high frequency preemphasis prior to modulation of the FM carrier so that a signal-to-noise ratio improvement may be realized when a complementary high frequency deemphasis is imparted to the luminance component subsequent to demodulation of the FM carrier (e.g., in a video disc or video tape player).
		These benefits are achieved by passing the luminance signal through two preemphasis networks, one of which exhibits a linear phase response and the other of which exhibits a non-linear phase response.
	www.freepatentsonline.com /4316210.html (6407 words)

	Agenda (Site not responding. Last check: 2007-10-21)
		Preemphasis: - The digitized speech signal, s(n), is put through a low-order digital system (typically a first-order FIR filter), to spectrally flatten the signal and to make it less susceptible to finite precision effects later in the signal processing.
		The digital system used in the preemphasizer is either fixed or slowly adaptive (e.g., to average transmission conditions, noise backgrounds, or even to average signal spectrum).
		In this case, the output of the preemphasis network, ŝ(n), is related to the input to the network, s(n), by the difference equation
	murray.newcastle.edu.au /users/students/2003/c3003091/System1.html (1897 words)

	[RT] FM Pre-emphasis
		What happens is that the preemphasis is added before the final limiting.
		Even though there may be some multiband spectral control, there is still a significant boost of the upper spectrum that is hitting the final limter.
		The receiver deemphasis section is basically returning the spectrum to theoretical "flat." Please understand thast since the final limiting is inserted in the "middle" of the preemphasis/deemphasis network, there will be a sonic change to what is heard.
	www.broadcast.net /pipermail/radio-tech/2001-October/011428.html (348 words)

	rc network for reed switch (Site not responding. Last check: 2007-10-21)
		They are using a network of GNU/Linux systems to run the Center's information system, coordinate drug therapies, and perform many other functions.
		For a complete system we still have much more work to do, but we will make an alpha release as soon as the network software is finished & shared libraries have been well tested.
		The RC network on the output of U2 is a...
	www.serverbusinesstechnology.info /bizserv/rcnetworkforreedswitch (695 words)

	Conditioning A/V Signals for RF Modulation - Maxim/Dallas
		The signal-conditioning requirements include lowpass and notch filtering of the video, group-delay compensation for the video, preemphasis for the audio, and (to adjust the modulation level) level controls for both audio and video.
		The preemphasis network is a lead-lag network formed around the op amp by R7, R8, R9 and C1.
		Note that, to prevent overmodulation by the boosted frequencies, the Figure 4 preemphasis is essentially removed by the second pole in the audio-reconstruction filter.
	www.maxim-ic.com /appnotes.cfm/appnote_number/3551 (1606 words)

	Preemphasis network -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-21)
		Preemphasis network -- Facts, Info, and Encyclopedia article
		Note: (Click link for more info and facts about Preemphasis) Preemphasis is usually employed in FM or (Modulation of the phase of the carrier wave) phase modulation transmitters to equalize the modulating (Any communication that encodes a message) signal drive (Possession of controlling influence) power in terms of deviation ratio.
		The receiver ((electronics) the reception of a signal by extracting it from the carrier wave) demodulation process includes a reciprocal network, called a (Click link for more info and facts about deemphasis) deemphasis network, to restore the original signal power distribution.
	www.absoluteastronomy.com /encyclopedia/p/pr/preemphasis_network.htm (127 words)

	Re(2): [RT] IBOC and the PD
		Preemp/deemph networks by themselves, and unprocessed, usually mirror each other and the audio is not affected, but with moderate processing on the FM Analog side, the preemphasis network basically becomes a variable function in order to keep the upper half of the allocated 15kHz audio spectrum out of heavy clipping and distortion.
		If you consider it, that's what we've been doing with FM Analog, trying to find the best method to manage the transmission path in order to improve the overall sound.
		From my point of view, the huge challenge for FM Analog has been the preemphasis curve.
	www.broadcast.net /pipermail/radio-tech/2002-August/026285.html (978 words)

	Erratta for Young (4th Ed.)
		The discussion of preemphasis and modulation index is totally bass-ackwards.
		Preemphasis provides greater frequency deviation for high frequencies.
		This results in constant modulation index for higher frequencies, and therefore the signal to noise ratio remains constant for frequencies above the break frequency (f
	moon.pr.erau.edu /~lyallj/ee410/youngerror_5.html (3254 words)

	Preemphasis network - Education - Information - Educational Resources - Encyclopedia - Music
		Preemphasis network - Education - Information - Educational Resources - Encyclopedia - Music
		We offer blogs and community building tools for authors, bands and users.
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	education.music.us /P/Preemphasis-network.htm (294 words)

	BLONDER TONGUE The BAVM-z is a low cost, professional quality, on-channel audio/video modulator
		The modulator complies with FCC 21006 with +/- 5 KHz visual carrier stability and required frequency offsets on all aeronautical channels.
		For BTSC stereo applications, a field-defeatable audio preemphasis network is provided making the BAVM-860SAW compatible with any outboard stereo generator that provides a composite baseband output.
		A -30 dB output test point and all user controls are provided on the front panel.
	www.starkelectronic.com /btp50.htm (401 words)

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