Filtering, AutoEQ & BWE
Please click inside the waveform to zoom and scroll through the audio - each example is divided into multiple segments and annotated with details about the algorithms. We recommend listening with headphones so you can hear all the details!
In the following example (BCB: The Voices of Bainbridge Island) of a female narrator speaking while background music is playing, you can easily recognize quite sharp 'sss' sounds in the female voice. This sharpness in the female voice is removed by the so-called De-essing feature of the Auphonic Voice AutoEQ, while the background music is not changed.
The next example (BCB: The Voices of Bainbridge Island) shows how the Voice AutoEQ optimizes a singletrack record containing two speakers with different voice characteristics. Our AutoEQ algorithms analyze each voice separately and calculate the matching frequency adjustments to optimize the voice of every single speaker.
This recording by conduitministries.com is recorded in a very reverberant room. The original audio sounds slightly dull, but the Voice AutoEQ version preserves the reverberation while adding more clarity. However, if you want to decrease the reverb, you could also select the Remove Reverb amount option in our Noise Reduction section.
This snippet extracted from a video about
“Pop Filter vs Windscreen”
demonstrates how the Voice AutoEQ reduces plosives in speech. The best results are achieved in combination with our
Noise Reduction
algorithm, which also removes the low-frequency rumble caused by plosives or other environmental sounds.
More information about plosive reduction (De-Plosive) with Auphonic is
here.
As a demonstration example, this
“Lex Fridman Podcast #457”
excerpt illustrates how it is possible to take a high-quality recording, downsample it to 4 kHz bandwidth,
and then use our bandwidth extension algorithm. The result comes remarkably close to the original audio with a full 20 kHz bandwidth.
Hear the difference yourself as the audio regains its natural clarity and depth:
In practice, bandwidth extension is useful for restoring historic recordings that have been downsampled due to bandwidth constraints. This example is a record of the historic “Margaret Thatcher's Iron Lady speech” and shows the difference between the original recording and the bandwidth-extended version:
We added a version with and without denoising here, to hear that our algorithm does not add frequencies to environmental sounds like noise, reverb, etc.
The second example is an archive recording of Richard Nixon's “End Of Vietnam War speech”: