"I decided to introduce a deeper understanding of sound and audio filtering to auscultation. I know that Bell and Diaphragm are more familiar, but with just a brief explanation of these beautiful concepts, you will have a far better understanding of how to use a stethoscope to listen for specific sounds. This will make things easier for you and give you a far more sophisticated understanding of audio."

                                   Clive Smith, One designer.

 

 

The One allows you to listen with multiple filter choices. You can also set the two you use most often as "favorites" that are super-quick to select. So you'll have both choice and speed. In the chart (right) you see four example choices, ranging from very low frequency (low pitched sounds such as S3), to higher frequencies (lung sounds) and a few in between.

The Hertz Scale on the One (above) gives you a relative idea of the filter range you have selected. LEDs to the left indicate that lower frequencies will be reproduced. LEDs to the right indicate higher frequencies will be reproduced. The more LEDs are on, the wider the range of frequencies, the narrower the indication, the narrower the range of frequencies for the filter you have selected. For instance, you may want to narrow the bandwidth to filter ambient noise or select for very specific heart sounds, such as listening to valve clicks, but exclude breath sounds while doing so.