- Joined
- May 11, 2012
- Messages
- 273
Ahoy there all,
Been writing R+D reports for various submission requirements and thought I'd share the results of the realtime DNR. Because we all love visual representations of audio results.
This is taken straight from the report. The content used was an old recorded tape of The Goon Show from decades ago.
Initial Signal (Goon Show)
Cleaned signal (Goon Show)
As can be observed quite clearly above, the cleaned signal has significantly reduced high-frequency noise content. It is important to note that the gap between the first two sections of speech is not intended to be silent. There is studio noise and quiet laughter here. This demonstrates both the effectiveness of using a highly multi-band system, and the way the system compares against the average signal content in each individual band separately. The result here is nothing short of fantastic, the noise is being dramatically filtered out without compromising the audio. The strength of the noise reduction was at about 50% on the adjustment knob – this adjustment is important as it allows for fine tuning the compromise between clarity and range.
This can also be observed in the spectrogram of the same section of audio played twice, on the left untouched and on the right with noise reduction. The amount of noise is clearly reduced down to well below audible level. This measures as anywhere from a 10 to 40dB reduction in noise.
The left is the original audio, the right is the cleaned audio in realtime. Scale is 20-20K on the vertical axis, time on the horizontal axis.
Note that it’s not merely a removal of those upper frequencies, as there is still content there across the audio sample.
We have done tests with music as well, and it sounds fantastic - it's just more obvious visually using voice and broadcast recordings.
Hope you're all having a pleasant time.
~D (Captain)
Been writing R+D reports for various submission requirements and thought I'd share the results of the realtime DNR. Because we all love visual representations of audio results.
This is taken straight from the report. The content used was an old recorded tape of The Goon Show from decades ago.
![Goons noisey.png Goons noisey.png](https://cdn2.imagearchive.com/quadraphonicquad/data/attach/103/103311-Goons-noisey.png)
Initial Signal (Goon Show)
![Goons clean.png Goons clean.png](https://cdn2.imagearchive.com/quadraphonicquad/data/attach/103/103312-Goons-clean.png)
Cleaned signal (Goon Show)
As can be observed quite clearly above, the cleaned signal has significantly reduced high-frequency noise content. It is important to note that the gap between the first two sections of speech is not intended to be silent. There is studio noise and quiet laughter here. This demonstrates both the effectiveness of using a highly multi-band system, and the way the system compares against the average signal content in each individual band separately. The result here is nothing short of fantastic, the noise is being dramatically filtered out without compromising the audio. The strength of the noise reduction was at about 50% on the adjustment knob – this adjustment is important as it allows for fine tuning the compromise between clarity and range.
This can also be observed in the spectrogram of the same section of audio played twice, on the left untouched and on the right with noise reduction. The amount of noise is clearly reduced down to well below audible level. This measures as anywhere from a 10 to 40dB reduction in noise.
![Goons spectra.png Goons spectra.png](https://cdn2.imagearchive.com/quadraphonicquad/data/attach/103/103313-Goons-spectra.png)
The left is the original audio, the right is the cleaned audio in realtime. Scale is 20-20K on the vertical axis, time on the horizontal axis.
Note that it’s not merely a removal of those upper frequencies, as there is still content there across the audio sample.
We have done tests with music as well, and it sounds fantastic - it's just more obvious visually using voice and broadcast recordings.
Hope you're all having a pleasant time.
~D (Captain)