muutub ja seetõttu ka RMS ajaline veaväärtus muutub. : . Näiteks, kui ribalaius võnkel, mis kasutab nn "raised cosine spectrum" `it varieerub, siis RMS ajaline veaväärtus kujuneb Y, välja nii,nagu näidatud joonisel 6-5-2
Teisendame siinuseks, kanname üle nt amplituud 1000, kestus 5 diskr.perioodi, faas 0. Iga arvu paneme kirja 10 bitiga.´, st kokku 30 bitti, mitte ei lähe 60 ega 300 Mbit. Mingi osa lõhutakse väiksemateks osadeks: tehakse koosinusteisendus igal ruudul. Toores pilt – 512 bit. Tav ühes otsas (punased) suured nr, teises väikesed. Üle kanname ainult piisavalt suured nr, nt 4 ruudukest ainult, 32 bit. DCT – A discrete cosine transform (DCT) expresses a finite sequence of data points in terms of a sum of cosine functions oscillating at different frequencies. DCTs are important to numerous applications in science and engineering, from lossy compression of audio (e.g. MP3) and images (e.g. JPEG) (where small high-frequency components can be discarded), to spectral methods for the numerical solution of partial differential equations. The use of cosine rather than sine functions is
263. . : : 1. Discrete Cosine Transformation - DTC, : F2 - : -ITU: H.261, H.263; , . -ISO: MPEG-1, MPEG-2, MPEG-4. F1 F3; 2
DCIM Duscrete Complex Image Method DCL Data Control Language + Declaration + DEC Command Language [DEC] + Device Clear + Digital Control Logic + Digital Command Language [Digital] DCML Dynamic Configuration Markup Language DCOM Distributed Component Object Model DCP Device Control Protocol + Digital Light Processing [TI] DCS Data Collection System + Data Control System + Desktop Color Separation + Distributed Control System DCT Discrete Cosine Transform .DCT Dictionary (file name extension) DCU Data-Cache Unit DD Day + Digital Display + Double Density DDA Distributed Data Access + Domain-Defined Attribute DDB Device Dependent Bitmap + Device Descriptor Block DDC Digital Data Channel [VESA] + Display Data Channel DDCMP Digital Data Communications Message Protocol [DEC] DDC1 Display Data Channel One DDCS Distributed Database Connection Services [IBM] DDD Direct Distance Dialing
rotate toward position 3. If the current through coil A is gradually decreased as the current through coil B is increased, the rotor will slowly move toward position 3, where it ends up when the current in coil A is zero and the current in coil B is maximum. If coil A and B are driven with sine signals that are offset by 90°, the motor will rotate smoothly. Figure 7.9 shows the discrete drive waveform with the equivalent sine/cosine drive and the corresponding rotor positions. A stepper can actually be driven this way. If the drive signals are generated from a DAC, the motor can be moved to discrete points between the normal step or half-step positions. This is called microstepping. It provides finer control of shaft position, but at the expense of more expensive analog drive circuitry. The actual resolution obtainable by microstepping depends on the resolution of the DAC, the torque of the motor, and the load
house in Teheran, they found a complete plan of Shah Mohammed Reza Pahlevi's summer palace, showing guard posts and the number of men stationed at each, top-secret documents from Army files, reports on the disposition of artillery along Iran's Russian border, two notebooks in what were obviously cipher, and another with page after page of what appeared to be trigonometric equations, replete with the Greek letters beloved of mathematicians and the abbreviations for "secant," "cosine," "tangent," and "cotangent." The problem was that mathematically the formulas made no sense at all. Colonel Mostafa Amjadi, chief of the intelligence directorate of the Teheran military governate, and another colonel in the Iranian Army went to work on the three notebooks. By August 30, they had cracked the two overt codes, but extracted only meager information from them. Meanwhile, Abbasi decided to talk. He revealed that the Tudeh party had
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