Description
Download the 1000 Hz (hertz) pure sine wave, which is the most familiar tone heard in broadcast.
Since it’s in the center of human hearing, this tone was used often for calibration of analog audio and video equipment.
Historical and Modern Uses:
This 1kHz tone is often heard:
After a TV station went off the air.
As an emergency services tone.
To bleep out bad words, even to this day.
This makes it the ultimate 10-hour test tone for audio enthusiasts and those seeking a reference frequency.

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