Tech behemoth Microsoft recently revealed how playing a particular song could crash certain models of its laptops. The song in contention was popular singer-dancer Janet Jackson’s chartbuster track ‘Rhythm Nation’.
Chen, a senior software engineer at Microsoft, said that they had discovered an unusual incident. According to Chen, playing ‘Rhythm Nation’ on a laptop led to the crashing of another laptop placed next to it. This happened even when the song was not played on the laptop.
Natural Resonant Frequency
In the blog, Chen said that the song contained one of the natural resonant frequencies for the model of 5400 rpm laptop hard drives which was used by Microsoft and other companies.
“The manufacturer worked around the problem by adding a custom filter in the audio pipeline that detected and removed the offending frequencies during audio playback,” Chen said.
The software engineer went on to say that he was sure that they had put a digital version of the ‘do not remove’ sticker on the audio filter. “And I’m sure they put a digital version of a ‘Do not remove’ sticker on that audio filter. (Though I’m worried that in the many years since the workaround was added, nobody remembers why it’s there. Hopefully, their laptops are not still carrying this audio filter to protect against damage to a model of hard drive they are no longer using. )” read the blog post.
According to experts, the issue was similar to the shattering of glass by an opera singer who croons in a particular tone. Since the sounds are acoustic waves, a particular wavelength for a said material can create the most vibration. This is known as the resonant frequency of the medium.
A Security Vulnerability?
A report filed by The Miter Corporation, an NGO conducting R&D on security, the affected laptops sold sometime in 2005 had crashed due to a similar frequency found in Jackson’s music video. The organization has categorized the issue as a security vulnerability which could potentially enable hackers to crash the system using the audio signal from the ‘Rhythm Nation’ music video.
Laptops today are unlikely to face such an issue considering the manufacturers have added a custom filter in the audio pipeline that identifies and obliterates the troublesome frequencies during audio playback.
‘Rhythm Nation’ the second single from Jackson’s album ‘Janet Jackson’s Rhythm Nation 1814’ was released in 1989. The song which was noted for its social theme and upbeat music climbed to the second spot in the Billboard Hot 100 upon its release. The song went on to win several accolades including BMI Pop Award for Most Played Song, Billboard Award for Top Dance/Club Play Single and nomination for Jackson as the Producer of the year at the Grammys.
.