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Chapter 8: TL MasterMeter
67
the reconstruction sounds “perfect” to the mas-
tering engineer, because the engineer’s equip-
ment can actually reproduce the waveforms
properly.
The Red Book format for CDs and the DVD specs
both allow for this illegal content and the mas-
tering engineer is still allowed to put out releases
that meet the spec while allowing consumers’
players to distort. With an oversampled peak
meter, the engineer will be able to know that the
music is clipping, by how much and where.
With this knowledge the engineer can then de-
cide with complete information whether or not
to accommodate the legal range of digital audio
on a PCM sampled system.
The goal of TL MasterMeter is to allow an engi-
neer to use a DSP model of the reconstruction
process to monitor the reconstructed waveform
for potential clipping at the final mix and mas-
tering stages. Using TL MasterMeter, engineers
can compare regular and intersample peaks over
time and make appropriate adjustments with-
out sacrificing overall level or dynamic range.
Utilizing an oversampled peak meter in the dig-
ital audio studio that represents the reconstruc-
tion filters in digital to analog converters is the
first step toward an improvement in audio qual-
ity in music releases.
References and Further Reading
Aldrich, Nika. Digital Audio Explained For the
Audio Engineer. San Francisco: Backbeat Books,
2004.
Banquer, Dan, Dick Pierce, Herbie Robinson, et
al. “Intersample Peaking.” Pro Audio Mailing
List. 21 December, 2002 - 31 December, 2002.
Nielsen, Soren and Thomas Lund. “Level Con-
trol in Digital Mastering.” Preprint 5019, 107th
AES Convention. Denmark, 1999.
Nielsen, Soren and Thomas Lund. “0 dBFS+ Lev-
els in Digital Mastering.” TC Electronic: Risskov,
Denmark. 17 July, 2003. http://www.tcelec-
tronic.com/media/ Level_paper_AES109.pdf
Nyquist, Henry. “Certain Topics in Telegraph
Transmission Theory.” Transactions of the AIEE.
Vol. 47 (April 1928): 617-644.
Shannon, Claude E. “Communication in the
Presence of Noise.” Proceedings of the IRE. Vol.
37 (January 1949): 10-21.
Using TL MasterMeter
TL MasterMeter uses the DSP power of Pro Tools
to model the conversion process found in typi-
cal consumer devices. In technical terms, the TL
MasterMeter algorithm uses a 31-tap Blackman-
Harris windowed sync conversion with over-
sampling ratios from 2x to 8x depending on the
session sample rate. The output of this DSP algo-
rithm is then displayed visually. This assists en-
gineers in highlighting potential distortion
which may be introduced on playback of mixes,
especially mixes which have been processed to
be particularly loud or “hot.”
TL MasterMeter can be used in two different
ways during a session: Real-Time Metering or
Historical Metering.
Real-Time Metering
TL MasterMeter can be used to monitor live sig-
nal levels, even if the Pro Tools transport is
stopped. This can be useful in quickly determin-
ing the appropriate level for mixing and master-
ing.
When used in real time, the timecode informa-
tion displayed in the browsers should be ig-
nored.
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