Hear The Music

Jul. 10, 2012

Musician earplugs and the 1.4 mm vent

Marshall Chasin
When fitting musician earplugs, the clinical rule of thumb is the longer the better.  This has to do with the issue of stability as well as minimizing the occlusion effect. Simply stated, the occlusion effect is caused by the wearer’s own voice (or vibration energy from their instrument that is transduced through the mandible and condyle to the boney portion
Jul. 03, 2012

Modifying musician earplugs

Marshall Chasin
Musician earplugs use some very creative methods to ensure that the attenuation that a musician receives is as flat as possible.  The lower frequency fundamental notes and the higher frequency harmonics are all treated identically- the spectrum of the music remains the same, albeit at a slightly lower level.   Technologies to accomplish this typically involve passive acoustic networks that utilize
Jun. 26, 2012

The romantic side of a 10 kohm resistor

Marshall Chasin
As readers of this blog are already aware, most modern hearing aids do a poorer job of reproducing music than many of the hearing aids in the late 1980s.  The limitation with all digital hearing aids is the analog-to-digital (A/D) converter that converts analog sound and music from the microphone into a series of numbers for the digital hearing aid
Jun. 19, 2012

Sound recording for the hard of hearing Part 5

Marshall Chasin
This is the fifth in a series of blogs outlining some of what we know about optimal music recording.  When reading through these blogs one should be struck that we really know everything we need to know already when it comes to recording.  In some cases, what was learned in our first year audiology class provided  “obvious” recording cues (such
Jun. 12, 2012

Digital Audio Workstations or DAW Part 4

Marshall Chasin
This is the fourth in a series of blog posts outlining some of what we know about optimal music recording.  When reading through these posts one should be struck that we really know everything we need to know already when it comes to recording.  In some cases, what was learned in our first year audiology class provided  “obvious” recording cues
Jun. 05, 2012

Music and XLR cables – Part 3

Marshall Chasin
This is the third in a series of blogs outlining some of what we know about optimal music recording.  When reading through these blogs one should be struck that we really know everything we need to know already when it comes to recording.  In some cases, what was learned in our first year audiology class provided “obvious” recording cues (such
May. 29, 2012

Music and Microphones for the Audiologist – Part 2

Marshall Chasin
This is the second in a series of blogs outlining some of what we know about optimal music recording.  When reading through these blogs one should be struck that we really know everything we need to know already when it comes to recording.  In some cases, what was learned in our first year audiology class provided  “obvious” recording cues (such
May. 22, 2012

Music recording for audiologists – Part I

Marshall Chasin
This is the first in a series of blogs outlining some of what we know about optimal music recording.  When reading through these blogs one should be struck that we really know everything we need to know already when it comes to recording.  In some cases, what was learned in our first year audiology class provided  “obvious” recording cues (such
May. 15, 2012

Why feedback control should be disabled for music programs – Part II

Marshall Chasin
Depending on the three ways that acoustic feedback management is implemented, one should think twice about enabling such a feature.  The three ways that have been used are: (1) phase cancellation, (2) overall reduction of gain, and (3) notch filtering. As discussed in Part I of this blog last week, phase cancellation is based on the generation of a sound
May. 08, 2012

Why feedback control should be disabled for music programs – Part I

Marshall Chasin
When all is considered, one can truly say that the real advantage of digital hearing aids is feedback management allowing the hearing aid wearer to achieve more gain before feedback is encountered.  There is scant evidence about the benefit of any of the other “advanced features” in hearing aids.  And other than feedback management (and perhaps a greater bandwidth) hearing