4th Gen. Focusrite Scarlett Series Interfaces – Solo, 2i2 and 4i4
October 19, 2023
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…is high definition voice quality for telephony audio, contrasted with standard digital telephony “toll quality.” It extends the frequency range of audio signals transmitted over telephone lines, resulting in higher quality speech. The general range of the human voice extends from approx. 80 Hz to 14 kHz but traditional, voiceband or narrowband telephone calls limit audio frequencies to the range of 300 Hz to 3.4 kHz. Wideband audio relaxes the bandwidth limitation and transmits in the audio frequency range of 50 Hz to 7 kHz or even up to 22 kHz.
List of smartphones with HD Voice support: https://en.wikipedia.org/wiki/List_of_smartphones_with_HD_Voice_support
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Probably more useful for Podcast recording is understanding the Narrowband, Wideband and Super Wideband standards for Microsoft Skype and Microsoft Skype for Business approved devices.
Narrowband has sampling frequency of 8kHz and a bandwidth of 100-3400 Hz.
Wideband has a sampling frequency of 16 kHz and a bandwidth of 50-7500 Hz.
Super wideband has a sampling frequency of at least 24kHz and a bandwidth of 50-11000 Hz.
If you have a guest using a USB Skype approved headset, it will likely conform to one of the standards above.
Thanks Mike!