4 ms·
Phone carriers cut off the frequency spectrum.
by andi999 4y ago
Phone carriers cut off the frequency spectrum.
- jiveturkey 4y agoi'm just referring to the acoustic isolation from the mechanical coupler. obviously (?) the passband for telephone comms is far short of ultrasonic
- andi999 4y agoWhat do you mean by acoustic isolation?
- jiveturkey 4y agohttps://en.wikipedia.org/wiki/Acoustic_coupler https://en.wikipedia.org/wiki/Acoustic_coupler
- andi999 4y agoYes, but what can ultrasonic do here?
- jiveturkey 4y agoThe complaint was that the wrong payment can be made, because audio leaks.
- andi999 4y agoyes. Now I understand, but then the stated advantage of longer distance is also gone...