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Difficulty: MediumInferences from the Text

Early sound recordings preserved on wax cylinders and lacquer discs present severe conservation dilemmas: mechanical playback using a physical stylus inevitably degrades the delicate grooved substrate with each pass, while warped, broken, or fungal-damaged media cannot withstand mechanical contact at all. To circumvent physical wear, preservationists developed non-contact optical scanning technologies that reconstruct audio by generating high-resolution, three-dimensional topographic maps of groove depth and lateral undulations. Unlike traditional phonographic reproduction, which captures audio signals strictly in real time, optical capture can proceed asynchronously at variable scanning speeds without distorting the pitch or temporal structure of the final reconstructed audio, as software algorithms translate spatial measurements into audio waveforms post-capture. Furthermore, because dust, micro-fractures, and surface debris produce distinct geometrical anomalies that deviate from the smooth sinusoidal curves of recorded sound waves, digital signal processing routines can mathematically filter these surface aberrations out of the topographic model prior to audio synthesis, yielding clean sound even from physically fractured media.

Based on the passage, which of the following statements are logically supported? (Select all that apply.)

  1. Reconstructing audio from an optically scanned medium does not require the scanning apparatus to operate at the precise speed at which the original recording was intended to be played.Answer
  2. B
    Optical scanning techniques are incapable of extracting coherent sound if physical media exhibit deep structural fractures across grooves.
  3. The digital filtering of surface imperfections relies on measurable geometric differences between genuine recorded sound waves and physical surface damage.Answer
  4. D
    Major sound archives have entirely phased out physical styluses in favor of optical scanning for all routine audio digitization.
  5. Retrieving recorded information via optical scanning avoids the cumulative physical deterioration inherent in traditional stylus playback.Answer

Answer

The statements confirming that scanning speed does not need to match playback speed, that digital filtering relies on geometric distinctions between noise and audio waveforms, and that optical scanning avoids stylus-induced substrate wear are all logically supported by the passage.
The passage explicitly provides evidence for three key propositions: first, that optical scanning can proceed asynchronously at variable speeds because spatial data is converted post-capture; second, that digital filtering works because physical debris and cracks deviate geometrically from smooth sinusoidal sound waves; and third, that non-contact scanning prevents the physical wear caused by mechanical styluses.

Step-by-Step Solution

1
Analyze the passage text to identify direct claims and underlying logical implications regarding optical scanning mechanics and traditional playback.
The passage establishes that optical scanning is non-contact (preventing wear), asynchronous (speed-independent), and capable of filtering noise based on geometric divergence from sinusoidal audio waves.
Reading Comprehension inference items require identifying statements that must be true based strictly on the text's explicit premises without external assumptions.
2
Evaluate each candidate statement against the established textual evidence.
The claims regarding asynchronous capture, geometric anomaly filtering, and non-contact preservation are substantiated; claims asserting failure on fractured media or institutional replacement policies are either contradicted or unaddressed.
Filtering out unsupported leaps and out-of-scope generalizations isolates the logically entailed propositions.

Key Concept

Drawing strictly bounded textual inferences from comparative technical explanations
Estimated Time:1m 30s
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Topics

Inferences from the Text

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