CEA Signal Processing & Electronics Flashcards
6 cards from real CEA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CEA Signal Processing & Electronics flashcards as text
What is the function of a phase-locked loop (PLL) in digital audio clock systems?
Answer: To lock a local clock to an incoming reference signal for synchronization
A PLL generates a local clock signal that precisely tracks an external reference, maintaining synchronization and minimizing jitter in digital audio systems.
What is 'slew rate' in the context of operational amplifiers used in audio circuits?
Answer: The maximum rate of change of output voltage, typically expressed in V/µs
Slew rate describes how fast an op-amp's output can change voltage, and if it is too slow for the signal frequency, it causes slew-rate distortion.
What is the primary purpose of a de-esser in audio signal processing?
Answer: To selectively reduce excessive sibilance ('s' and 'sh' sounds) in vocal recordings
A de-esser is a frequency-selective compressor that detects and attenuates harsh high-frequency sibilant energy in vocal recordings.
In digital audio, what does 'jitter' refer to?
Answer: Timing variations in a digital clock signal that can cause sampling errors
Jitter is the deviation of a digital clock's transitions from their ideal timing positions, which can introduce noise and distortion in digital audio systems.
What is the standard impedance of a professional balanced line-level output in audio?
Answer: 50–200 Ω (low impedance)
Professional balanced outputs use low source impedance (typically 50–200 Ω) so they can drive long cable runs with minimal signal loss and noise pickup.
What does 'headroom' mean in audio electronics?
Answer: The difference between the nominal operating level and the maximum level before clipping
Headroom is the margin between the normal average operating level and the clipping point, allowing transient peaks to pass without distortion.