Digital Signal Processing Questions & Answers

Digital Signal Processing Questions & Answers An increase of 6dB intensity corresponds to what increase in amplitude? - CORRECT ANSWER - Amplitude doubles every 6dB An increment of double the frequency of a 440Hz note results in which pitch? - CORRECT ANSWER - Doubling the frequency puts the note an octave higher, which is the same pitch (A). Calculate the required bps rate of a digital equivalent of PAL: 625 lines/frame (-51 not used for image) 4:3 ratio 8bits for luminance, half for CbCr 25frames/s - CORRECT ANSWER - 574 lines/frame vert. res. = 574 hor. res. = 574 * 4 / 3 = 765 Spatial sampling = 574 * 765 * (8 + 4 + 4) = 7025760 b/frame 7025760 * 25 = bps Can cones differentiate the frequency of the stimulation? - CORRECT ANSWER - No. Describe a 1D Signal - CORRECT ANSWER - Line drawn against 2-axis. Describe H.261 - CORRECT ANSWER - Low resolution Just I and P frames Quantization thresholds Describe H.263 - CORRECT ANSWER - Real time Video telephony over telephone channels Lots of artifacts I,P,B frames Describe MJPEG? - CORRECT ANSWER - One static jpeg per frame. Describe PNG format. - CORRECT ANSWER - Compressed bitmap images. Lossless Multiple levels of transparency.