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is difficult, the derivative of the phase with respect the frequency, called the envelope delay distortion, is what is measured. Envelope delay is the measure of time to propagate the modulation (the actual information applied to the signal) through the system. Distortion of this envelope while propagating through the system is described by the EDD measurement. Nonlinearities in phase characteristics go undetected in voice applications but create serious problems with digital data streams. Envelope delay distortion is complex and should be understood before one examines how instruments make the measurement. Figure 25.9 compares a linear to a nonlinear channel. If one modulates the amplitude of a carrier and frequency-sweeps this signal over a nonlinear channel, the phase difference between the lower and upper sidebands will change according to the degree of nonlinearity. This change or relative delay can be measured and constitutes the envelope delay in time vs. frequency of the channel. The presence of changing delay vs. frequency is a measure of the envelope delay distortion of the channel. The most common measurement configuration is end-to-end, a complication of which is getting the relative phase distortion information back to the transmitter for comparison to the phase of the transmitted signal. The scheme used is to design a transmitter that will operate in two modes. The modulated transmitter signal for the measurement channel, called the Normal setting, is capable of sweeping the channel over the voice band of frequencies. The receiver end is configured in a Repeat setting, which retransmits the modulated signal back to the sending set on a separate channel but at a fixed carrier frequency. Fixed changes in phase exist throughout this scheme, but the changes in phase vs. frequency are preserved and available for processing at the Normal test set end of the measurement. The direction of test can be reversed by each set switching roles between Normal and Repeat modes. The North American version uses an 831 3 Hz modulating frequency on the variable-frequency carrier. The amplitude modulation yields two sidebands and it is their relative phase that is measured. The transmitter in the Repeat mode uses the 831 3 Hz modulating frequency extracted from the Normal signal, but the return carrier is fixed in frequency at typically 1800 Hz. As a result, all relative phase changes are from the nonlinearities of the Normal channel under test. The ITU version uses a modulating frequency 412 3 Hz and also provides a singlechannel measurement scheme. This single-channel scheme requires the two test sets to engage in a timesharing mode to alternately transmit test signal, store, and telemeter the data back to the originating test set. (Refer to the ITU standard for more discussion of this scheme.) Test sets also may provide a loopback measurement in which the measured EDD is indicative of the round trip of the circuit under test. These test sets make the assumption that the distortion present is equally distributed on both legs of the channel. The test set then assigns half of the distortion to each channel. (Any asymmetry of the legs will make such an assignment faulty.) The receiver of the Normal test set receives and demodulates the fixed-carrier Repeat signal. It extracts its own transmitter s modulating phase information and allows the user to set in a zero delay reading at the voice band center frequency, usually 1800 Hz. Then, as the transmitter carrier is swept across the voice band, the receiver reads out the delay in microseconds vs. frequency. Figure 25.9 depicts a typical EDD curve that results. The receiver in the Repeat mode serves only to deDownloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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Insider User: 10.0.1.11
CHAPTER 16:
We partition the interval [a, b]:
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standard is used in Canada, Mexico, the U.S, and Japan. NTSC is shorthand for National Television Systems Committee. The PAL standard and its variations PAL-M and PAL-N are used in most of Europe, as well as China, India, South America, Africa, and Australia. PAL is shorthand for Phase Alternating Line. A third standard, known as SECAM, is in use in Russia and France. SECAM is the acronym for Syst me lectronique pour Couleur avec M moire. The English translation of SECAM is Sequential Color with Memory. Production for SECAM is accomplished using PAL format equipment. These television standards are adapted from the electrical standards of the respective countries. Long before the invention of television, the US standard for electricity was developed so that manufacturers would be able to make products that would work when plugged in to a common electrical source. The US standard was set at 110/120 volts, with the system changing polarity from positive to negative and back again, 60 times a second. This sequence is referred to as alternating current, with each positive/negative polarity change termed a cycle. In Europe, the standard was set at 220/240 volts and 50 cycles per second. When first introduced, television broadcasts were in black and white, and the NTSC standard mandated a rate of 30 frames per second with two fields comprising a frame, for 60 fields per second. NTSC uses 525 scan lines to compose a frame, with the odd lines displayed as field one and the even lines displayed as field two. The fields interlace on presentation to compose a frame. The PAL standard adopted a rate of 25 frames per second, also comprised of two fields, for 50 fields per second, and uses 625 scan lines to compose a frame. The scan line counts are the product of a string of small integer factors that, at the time, could only be reliably supported by vacuum tube divider circuits 525 is 7 5 5 3, and 625 is 5 5 5 5. These divider circuits derive the field rate from the power line rate. These factors combined to give monochrome NTSC 525/60 television a line rate of 30 (7 5 5 3), or exactly 15.750 kHz. Monochrome PAL 625/50 television has a line rate of 25 (5 5 5 5), or exactly 15.625 kHz. With the introduction of color for television, the NTSC number takes on immense significance, whereas the PAL signal structure was mostly unaffected. In 1953, when adding color to the monochrome signal, a second NTSC determined that it would be appropriate to choose a color subcarrier in the region of 3.6 MHz. This subcarrier would imbed the color information within the television signal. But there was a technical concern with adding the color information without disturbing the sound subcarrier element of the signal. Too close a relationship in the subcarrier frequencies would result in distortion that would become visible in the luminance component of the signal. Remember that the responsibility for setting broadcast standards resides with the Federal Communications Commission (FCC). If the FCC had altered the sound subcarrier frequency to be increased by the fraction 1001/1000 (as recommended by the second NTSC) that is, increased by 4.5 kHz to about 4.5045 MHz then the color subcarrier in NTSC could have been exactly 3.583125 MHz, the line and the field rates would have been unchanged, and we would have retained exactly 30 frames per second! But true to form, alas, the FCC refused to alter the sound subcarrier for fear of possible minor audio interference on existing black and white television receivers. Instead, the FCC
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