Saving the Sounds of the Past
[1]
For over a century, the earliest recordings of human speech and musical performances remained trapped on fragile, rapidly decaying media. Early audio cylinders made of soft wax, discs composed of brittle shellac, and delicate tinfoil sheets held the voices of historical figures, poets, and musicians. However, actually playing these historic recordings meant risking their permanent destruction. The physical contact of a playback stylus, or needle, would inevitably scrape away the microscopic grooves etched into the surface, eroding the precious sound waves with every single listen. For decades, archivists faced a frustrating paradox: to hear the past, they had to destroy it.
[2]
To solve this problem, physicist Carl Haber developed a revolutionary non-contact method using high-resolution digital imaging. By scanning the surfaces of these delicate media, Haber’s system—known as IRENE—creates a detailed, ultra-high-resolution three-dimensional map of the grooves. Software then analyzes this visual map and reconstructs the audio, bypassing the need for any physical contact with the fragile object. _________
[3]
Through this technology, researchers have successfully restored recordings once deemed completely unplayable. For example, a tinfoil recording of inventor Alexander Graham Bell's voice from 1885, previously far too damaged to touch, was played back clearly for the first time in over a century. The voices of the past are no longer silent, thanks to this innovative intersection of particle physics, digital imaging, and historical sound preservation.
The writer wants to add a sentence at the end of Paragraph 2 (after the sentence ending in 'fragile object') to conclude the paragraph and transition to the next paragraph. Which of the following sentences best accomplishes this goal?
- By translating physical grooves into digital information, this optical method paved the way for retrieving sound from artifacts that were once considered unsalvageable.Answer
- BBy scanning the fragile records with light rather than a physical needle, the audio is safely extracted by researchers without causing any wear.
- CThis revolutionary approach allows archivists to recover sound digitally, which lets them retrieve the audio in a digital format without touching the records.
- DHowever, this optical scanning software can be extremely expensive and requires high-performance computing systems that many smaller archives cannot afford.