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24 Cards in this Set
- Front
- Back
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What are the two most basic characteristics of sound?
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Frequency
Amplitude |
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What deals with the component of time?
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Frequency
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What deals with the signal-level component?
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Amplitude
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What two analogous components can digital audio be broken down into?
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Sampling
Quantization |
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What represents the component of time?
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Sampling
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What represents the signal-level component in digital audio?
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Quantization
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Digital recording process takes periodic what of a changing audio waveform?
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Samples
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What happens in the digital recording process after it takes a periodic sample?
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Transforms these signal levels into a representative stream of binary words that can be manipulated or stored for later processing and/or reproduction.
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Within a digital audio system, what is defined as the number of measurements (samples) that are taken of an analog signal in one second?
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Sampling Rate
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Define Sampling Rate...
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the number of measurements (samples) that are taken of an analog signal in one second.
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What is the elapsed time that occurs between each sampling period?
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Sampling Rate
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The sampling rate of a system determines its overall what?
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Bandwidth (higher sample rates is capable of storing more frequencies at its upper limit)
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What theorem states that in order for the desired frequency bandwidth to be faithfully encoded in the digital doman, the selected sample rate must be at least twice as high as the highest frequency to be recorded?
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Nyquist Theorem
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What = (sample rate >_ 2 x highest frequency)
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Nyquist Theorem
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If frequencies greater than one-half the sample rate are allowed to enter into the path, erroneous frequencies known as what could enter into the audible signal as false frequencies, which would be heard as harmonic distortion?
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Alias Frequencies
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What causes Alias Frequencies to enter the signal path?
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frequencies are greater than one-half the sample rate are allowed to enter in the path.
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How do you eliminate the effects of aliasing?
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A low-pass filter is placed before the analog-to-digital conversion stage.
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What is a process that's commonly used to improve a Nyquist filter's anti-aliasing characteristics?
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Oversampling
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What is used to translate the voltage levels of a continuous analog signal into binary digits for the purpose of manipulating and/or storing audio data in the digital domain?
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Quantization
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What are binary digits also called?
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Bits
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By sampling the amplitude of an analog signal at precise intervals over time, it becomes the job of the converter to determine what?
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The Exact Voltage Level of the Signal
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Is the process of quantizing a signal continuous like analog signals?
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No.
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What do you call adding a small amount of random noise into the A/D path?
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Dither
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By adding a small amount of random noise into the A/D path, what happens to the resolution?
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It improves and reduces harmonic distortion in a way that greatly improves the signal's performance
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