New microphone
Doug Marmion
dem at COOMBS.ANU.EDU.AU
Sun Aug 21 06:26:48 UTC 2005
Hi,
Bartek Plichta gave me permission to post the
following information, which comes from a posting
of his to the Akustyk* mailing list.
cheers,
doug marmion
* Akustyk is a vowel analysis software package
that Bartek built as an add-on to Praat (the
powerful, free, but complex to use, acoustic
analysis software). Further info about Akustyk is
here: <http://bartus.org/akustyk/>
>Date: Sat, 20 Aug 2005 11:22:58 -0500
>From: Bartlomiej Plichta <plichtab at msu.edu>
>Subject: Re: New microphone
[snip...]
>I thought I would give you and update on a new
>microphone that is one of the best speech
>recording tools I've ever seen. Beyerdynamic of
>Germany was kind enough to let me collaborate
>with them on a new design to their recent Opus
>55 Mk II microphone. It is a new microphone and
>can be easily confused with its predecessor,
>Opus 55. This one, however, is called Opus 55 Mk
>II.
>
>The Opus 55 Mk II is a medium sensitivity,
>omnidirectional microphone, designed to be
>neck-worn. It has an ultra-flat frequency
>response and records speech with incredible
>fidelity and detail.
>
>One of the most difficult tests for any
>professional microphone is vowel nasalization.
>Nasalized vowels have a very complex spectrum,
>particularly close to the fundamental frequency,
>below F1, and between F1 and F2 (for most
>vowels, anyway). If the microphone is not able
>to produce a detailed and flat recording, one
>will not be able to analyze nasalization
>properly. The images below show spectrograms and
>narrow-band spectra of two Polish words: /deby/
>(non-nasal) and /d´by/ (nasal). The Opus 55 Mk
>II was able to record the spectral differences
>beautifully and reliably, probably better than
>any other microphone I've tested. The recording
>was done with a Sound Devices MixPre
>preamplifier and a Sony TCD-D100 DAT recorder at
>16-bit/48,000 Hz. You can download a sample
>phrase here
><http://www.msu.edu/%7Eplichtab/media/BD_opus_sample.wav>
>(/czarna krowa w kropki bordo gryz½a traw´
>kr´c´c mordà/).
>
>Akustyk records very realistic nasalizatio n
>values (A1-P0 and A1-P1) for these two vowels:
>
>*deby (non-nasal)*: a1-p0=10.30; a1-p1=28.66
>*d´by (nasal)* : a1-p0=1.47; a1-p1=18.81
>
>The Beyerdynamic Opus 55 Mk II is available in
>the US as a special order only. It will also
>need an in-line phantom power adapter to be able
>to work in wired applications. Those of you who
>live in Europe should have no trouble ordering
>it. In the US, I recommend BH PhotoVideo in New
>York or online.
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