Unit 4 Exam AET questions with verified
answers graded A+
Sampling Rate - correct answer ✔✔Process to convert analog to digital sound
Directly correlates to frequency
Instantaneous amplitudes of continuous analog signal, measured at equally spaced points
Increase SR, record higher frequencies
Bandwidth - correct answer ✔✔Range of effected frequencies
Bandwidth measured in octaves
Q measured in quality factor
Bit Depth - correct answer ✔✔Resolution of the digital signal measures the amplitude of the
soundwave
Increase bit depth, increase dynamic range
Also called quantization error
Dynamic Range - correct answer ✔✔Difference between the loudest undistorted signal to that
of the quietest discernible signal
Binary - correct answer ✔✔
Quantization - correct answer ✔✔Assigning numerical values to samples
Anti-Aliasing Filter - correct answer ✔✔High cut filter out all the high frequencies above 20K
, Virtual Tracks - correct answer ✔✔
Lossy Compression - correct answer ✔✔Permanently removes data
Lossless Compression - correct answer ✔✔As the file size is compressed, the picture quality
remains the same - it does not get worse. Also, the file can be decompressed to its original
quality.
Better quality than lossy
MP3 (Specifically 128K Compression) - correct answer ✔✔First time in recording history that we
took a step back in audio quality; why SACD and DVD-A failed
CD - correct answer ✔✔Redbook is the audio version of the CD
Designed to be 74 minutes long, enough to record Beethoven's 9th symphony
Error correction has gotten better because of buffer circuits but without these, digital audio is
mute
DVD - correct answer ✔✔Dual layer
Rely on data compression
96K sample rate
24 bit bit depth
Blu-Ray - correct answer ✔✔
SACD - correct answer ✔✔Super Audio Compact Disk
High resolution format
answers graded A+
Sampling Rate - correct answer ✔✔Process to convert analog to digital sound
Directly correlates to frequency
Instantaneous amplitudes of continuous analog signal, measured at equally spaced points
Increase SR, record higher frequencies
Bandwidth - correct answer ✔✔Range of effected frequencies
Bandwidth measured in octaves
Q measured in quality factor
Bit Depth - correct answer ✔✔Resolution of the digital signal measures the amplitude of the
soundwave
Increase bit depth, increase dynamic range
Also called quantization error
Dynamic Range - correct answer ✔✔Difference between the loudest undistorted signal to that
of the quietest discernible signal
Binary - correct answer ✔✔
Quantization - correct answer ✔✔Assigning numerical values to samples
Anti-Aliasing Filter - correct answer ✔✔High cut filter out all the high frequencies above 20K
, Virtual Tracks - correct answer ✔✔
Lossy Compression - correct answer ✔✔Permanently removes data
Lossless Compression - correct answer ✔✔As the file size is compressed, the picture quality
remains the same - it does not get worse. Also, the file can be decompressed to its original
quality.
Better quality than lossy
MP3 (Specifically 128K Compression) - correct answer ✔✔First time in recording history that we
took a step back in audio quality; why SACD and DVD-A failed
CD - correct answer ✔✔Redbook is the audio version of the CD
Designed to be 74 minutes long, enough to record Beethoven's 9th symphony
Error correction has gotten better because of buffer circuits but without these, digital audio is
mute
DVD - correct answer ✔✔Dual layer
Rely on data compression
96K sample rate
24 bit bit depth
Blu-Ray - correct answer ✔✔
SACD - correct answer ✔✔Super Audio Compact Disk
High resolution format
