PAT 201 EXAM SCRIPT 2026 COMPLETE
QUESTIONS AND CORRECT ANSWERS
GRADED A+
●● Sample Rate.
Answer: The number of times the analog to digital converter measures
the analog signal per second while recording.
●● Nyquist Theory.
Answer: The upper frequency limit in a recording is one half the
sampling rate.
●● Bit Depth.
Answer: Audio signal is measured thousands of times a second and
generates a string of binary numbers called words. The length of a word
corresponds to bit depth or resolution.
●● Why do we care about sample rate/bit depth?.
Answer: Sample rate affects high frequency response, and bit depth
affects the dynamic range, noise and distortion. With a low sample rate,
high frequencies will be weaker, and with a low bit-rate dynamics will
be dulled, noise will be present, and a sample will be distorted. These
concepts are very important to the clarity and quality of sound. Low bit
depth can also be utilized as an effect.
,●● Why are higher bit depths preferable?.
Answer: The longer a word, the more bits it has and the more accurate
each signal measurement is. Longer words give good resolution (low
distortion), whereas short words give poor resolution (high distortion).
●● What is aliasing of high frequencies?.
Answer: Aliasing is when the sampling rate is too low and false data of
the lower frequencies gets recorded. The higher frequencies are then
distorted with the lower frequencies, and incorrect signals are
reproduced.
●● How does an analog-digital converter prevent aliasing?.
Answer: An analog-digital converter runs samples through a low pass
filter that removes all frequencies above 20kHz (anti-aliasing filter). The
range of human hearing doesn't go above 20kHz, but if the low
frequencies alias, the effect on the high frequencies (even those above
20kHz) is perceived by the human ear as distortion. Thus, the anti-
aliasing filter cuts out the high frequencies to prevent aliasing between
the high and low frequencies.
●● How does an analog-digital converter work?.
Answer: An analog-digital converter measures (or samples) the voltage
of an audio waveform several thousand times per second, quantizes it
(generates binary digits or "bits" that are representative of the signal),
, and then stores the recording as a modulate square wave recorded at
maximum level.
●● What is the Red Book CD Standard?.
Answer: Red Book is a document released by Sony and Philips in the
1980's that defines the standards for a CD. According to the Red Book,
CD data should be digitized at 44,100 samples per second (44.1kHz) in a
range of 16 bits (65,536 possible values).
●● What is Audio Quantization?.
Answer: Quantization is the process in which a analog-digital converter
measures the voltage of an audio waveform and generates representative
binary numbers.
●● What does frequency response mean?.
Answer: A graph of how a particular device (microphone) responds to
certain frequencies that plots output level vs. frequency. A horizontal
line indicates a "flat frequency response" meaning that the device level
is the same at all frequencies. Most devices do not have a flat frequency
response, rather, they respond to a specific range of frequencies.
●● What equipment/connections are needed to record a singer in logic?
(check with Jeremy).
Answer:
QUESTIONS AND CORRECT ANSWERS
GRADED A+
●● Sample Rate.
Answer: The number of times the analog to digital converter measures
the analog signal per second while recording.
●● Nyquist Theory.
Answer: The upper frequency limit in a recording is one half the
sampling rate.
●● Bit Depth.
Answer: Audio signal is measured thousands of times a second and
generates a string of binary numbers called words. The length of a word
corresponds to bit depth or resolution.
●● Why do we care about sample rate/bit depth?.
Answer: Sample rate affects high frequency response, and bit depth
affects the dynamic range, noise and distortion. With a low sample rate,
high frequencies will be weaker, and with a low bit-rate dynamics will
be dulled, noise will be present, and a sample will be distorted. These
concepts are very important to the clarity and quality of sound. Low bit
depth can also be utilized as an effect.
,●● Why are higher bit depths preferable?.
Answer: The longer a word, the more bits it has and the more accurate
each signal measurement is. Longer words give good resolution (low
distortion), whereas short words give poor resolution (high distortion).
●● What is aliasing of high frequencies?.
Answer: Aliasing is when the sampling rate is too low and false data of
the lower frequencies gets recorded. The higher frequencies are then
distorted with the lower frequencies, and incorrect signals are
reproduced.
●● How does an analog-digital converter prevent aliasing?.
Answer: An analog-digital converter runs samples through a low pass
filter that removes all frequencies above 20kHz (anti-aliasing filter). The
range of human hearing doesn't go above 20kHz, but if the low
frequencies alias, the effect on the high frequencies (even those above
20kHz) is perceived by the human ear as distortion. Thus, the anti-
aliasing filter cuts out the high frequencies to prevent aliasing between
the high and low frequencies.
●● How does an analog-digital converter work?.
Answer: An analog-digital converter measures (or samples) the voltage
of an audio waveform several thousand times per second, quantizes it
(generates binary digits or "bits" that are representative of the signal),
, and then stores the recording as a modulate square wave recorded at
maximum level.
●● What is the Red Book CD Standard?.
Answer: Red Book is a document released by Sony and Philips in the
1980's that defines the standards for a CD. According to the Red Book,
CD data should be digitized at 44,100 samples per second (44.1kHz) in a
range of 16 bits (65,536 possible values).
●● What is Audio Quantization?.
Answer: Quantization is the process in which a analog-digital converter
measures the voltage of an audio waveform and generates representative
binary numbers.
●● What does frequency response mean?.
Answer: A graph of how a particular device (microphone) responds to
certain frequencies that plots output level vs. frequency. A horizontal
line indicates a "flat frequency response" meaning that the device level
is the same at all frequencies. Most devices do not have a flat frequency
response, rather, they respond to a specific range of frequencies.
●● What equipment/connections are needed to record a singer in logic?
(check with Jeremy).
Answer:
