The noise of a muted television

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SUMMARY

The discussion centers on the high-pitched noise emitted by muted televisions and other electronic devices, particularly when using a DTV box. Users report that the sound resembles tinnitus and is more noticeable in older cathode ray tube (CRT) TVs and monitors, which can produce frequencies over 15 kHz. The noise may also vary depending on whether the TV is receiving an input signal, as the frequency can change when the 15 kHz locks into the incoming video. Additionally, switched mode power supplies are identified as a common source of similar high-frequency buzzing sounds in various electronic equipment.

PREREQUISITES
  • Understanding of high-frequency sound perception
  • Familiarity with cathode ray tube (CRT) technology
  • Knowledge of digital television (DTV) systems
  • Awareness of switched mode power supplies (SMPS)
NEXT STEPS
  • Research the effects of high-frequency sounds on hearing
  • Explore the differences between CRT and modern LCD/LED televisions
  • Investigate the operation of DTV boxes and their impact on audio output
  • Learn about the design and function of switched mode power supplies
USEFUL FOR

Electronics enthusiasts, audio engineers, and anyone experiencing high-frequency noise from televisions or electronic devices.

jreelawg
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I have noticed that the television makes a very high pitched noise. You almost can't tell your hearing it until it is turned off. It is kind of like the ringing of the ear in a way. Then When I turn on the DTV box, the sound becomes a little louder and changes frequency.

Does anyone know what makes this noise? Is it some kind of electronic buzz? I also noticed that my computer, even while on power save mode, makes a similar annoying high pitch buzzing sound.
 
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Old style cathode ray tube TVs and monitors do whine at over 15 kHz (TVs). Usually only younger folks can hear so high.

A TV with no input can sound a little different to one with an input when the 15kHz locks into the incoming video. I would have thought the difference was small.

Another source would be switched mode powers supplies which are common in all sorts of equipment these days.
 

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