Digital Theory 2 (Stack #41138)
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| In digital audio's binary system, what are the numbers 1 and 0 called? | Bits
{8 bits is 1 byte; 4 bits is a nybble}
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| What is sampling rate or frequency? | The number of times per second a signal's amplitude is checked and assigned a numerical value.
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| What is resolution? | The nubmer of steps in amplitude expressed in bits
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| How many times higher than the frequency of the signal to be sampled MUST our sampling rate be? | 2
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| Iin a digital system, what is an anti-aliasing filter (LPF) used for? | To remove frequencies too high to be sampled at the selected sampling rate
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| What do we call the noise added to digital audio to improve low amplitude resolution? | Dither
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| What kind of recording system records continuously varying waveforms? | Analog
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| What kind of recording system records waveforms as stepped, numberic increments? | Digital
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| What component in a digital system controls timing functions? | Clock {or [digital] wordclock}
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| What component converts analog signal to digital data? | Analog to digital converter (A/D or ADC)
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| What category of digital recorders do DASH machines belong to? | Stationary Head
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| What category of digital recorders do DATs, ADATs, and Tascam DTRS machines belong to? | Rotary Head
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| What does MDM stand for? Give 2 examples. | Modular Digital Multirack:
ADAT and DTRS machines
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| What is the sampling rate of Red Book audio CDs? | 44.1 kHz
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| What is Red Book CD resolution? | 16-bit
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| What represents bits on a CD? | Pits
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| What reads the data from a CD? | A Laser (and optical pickup)
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| What does 5.1 surround mean? | 5 full bandwidth channels: L, C, R, and L&R surround
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| What surround formats are in 5.1? | Dolby Digital and DTS
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| What surround format adds left and right center channels (7.1)? | SDDS
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| Which sounds better - THX or DTS? | Question is invalid:
DTS is a surround sound encoding process.
THX is room and system certification.
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| What 2 new formats offer higher quality and more channels than CD? | DVD-A and
SACD
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| What do we call the systems used for exchange of digital audio? | Digital audio interfaces
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| Which are not digital audio interfaces: AES/EBU, MADI, MIDI, S/PDIF, TDIF, ALESIS “lightpipe”, Billy’s crackpipe? | In addition to the obvious one,
MIDI - It carries data used to control midi devices, not audio
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| What is replacing wire as a signal/data carrier? | Fiber optics
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| Which are not proprietary interfaces: AES/EBU, MADI, S/PDIF, TDIF, ALESIS “lightpipe” | AES/EBU and
MADI
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