[LAU] First release of jkmeter

porl sheean porl42 at gmail.com
Sun Aug 3 11:43:51 EDT 2008

it would be nice to see something like this integrated into ardour, at
least in the output channels as an option. i'd like the ability to get
a standard reference level to compare against apart from the 'ok, it
has clipped now, turn it down a tad' level it currently shows :)


2008/8/4 Raphaël Doursenaud <rdoursenaud at free.fr>:
> Hash: SHA1
> Fons Adriaensen a écrit :
>> Hello all,
>> The first release of jkmeter is now available in the
>> usual place:
>> <www.kokkizinita.net/linuxaudio/downloads>
>> Also updates of japa and jnoise (mostly maintenance,
>> but see also below).
>> From the README:
>> jkmeter-0.1.0 (03/08/2008)
>> --------------------------
>> Jkmeter is a horizontal or vertical bargraph level
>> meter based on the ideas of mastering guru Bob Katz.
>> See <http://www.digido.com/bob-katz/index.php> and
>> follow the links on 'level practices'.
>> This is the type of meter you want for live recording,
>> mixing and mastering. It probably makes no sense to
>> use it on all tracks of a DAW, where keeping digital
>> level within limits is the main purpose of metering.
>> This release implements the K-20 meter. Future
>> releases will include the K-14 meter as well.
>> A K-meter displays both the true RMS level and the
>> digital peak level. The ballistics as defined by Bob
>> Katz are somewhat ambiguous. In this implementation
>> the RMS meter is about 15% faster than an VU, but
>> without the overshoot. This provides a good indication
>> of subjective loudness.
>> Instead of providing extra gain for the RMS level,
>> the K-meter displays it on the same scale as the
>> digital peak level, but puts the '0dB' mark and the
>> color change well below the OdB full scale level.
>> For the K-20 meter it is 20dB down, for the K-14
>> this is (surprise !) 14 dB.
>> To use the meter as envisaged by Bob Katz, you
>> should have a fixed monitoring level, adjusted
>> so that pink noise indicating 0dB on the meter
>> corresponds to 83 dB(C) (from each speaker) as
>> indicated by an sound level meter. Note the (C)
>> - not (A) - weighting.
>> As of release 0.4.0, both japa and jnoise provide
>> a pink noise source at exactly this level.
>> The current release does not include the 22kHz
>> lowpass filter required for frequencies such as
>> 96kHz and higher.
>> Enjoy !
> Thanks a lot! It's been some time I was waiting for such a meter!
> Of course the adress is : http://www.kokkinizita.net/linuxaudio/downloads/
> - --
> Raphaël Doursenaud
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