3 ms·
440 Hz is also the standard telephone dial tone in the US.
by mediaserf 10y ago
440 Hz is also the standard telephone dial tone in the US.
- sp332 10y agoDial tones are a chord of 440 and 350 https://en.wikipedia.org/wiki/Precise_Tone_Plan https://en.wikipedia.org/wiki/Precise_Tone_Plan This follows on from DTMF's use of pairs of tones for signalling. https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_sign...
- finnh 10y agoI love the scene in Adaptation where a tripping Meryl Streep and Chris Cooper harmonize the dial tone chord while talking on the phone.
- deleted 10y ago[deleted]