In This Section
Audibility of a CD-Standard A/DA/A Loop Inserted into High-Resolution Audio Playback - September 2007
Sound Board: Food for Thought, Aesthetics in Orchestra Recording - April 2015
Reflecting on Reflections - June 2014
AES Engineering Briefs Forum
MS Mastering of Stereo Microphone Signals
MS (mid-side) technique is a classic tool for recording and mastering based on coincident microphone setups. For these, localization theory tells us that on reproduction via loudspeakers, the interaural level differences (ILDs) will yield stable and fully mono-compatible results. Yet, when a mastering engineer obtains a mix, he will rarely be told how the specific sources were recorded. Was it as mono signals, level panned to a certain reproduction angle, or with coincident, spaced, or mixed stereo microphone setups. While the first two techniques only involve ILDs, spaced microphone techniques also imply interaural time differences (ITDs). MS matrixing techniques can be applied to change the apparent width of a full stereo mix in postproduction. The engineer should be aware that he then cross-feeds signals between the channels. The signal paths from a signal sound source, via the microphones, the matrixing, and the loudspeakers, to finally reach the ears, can now be seen as eight, instead of four for coincident techniques. An increased sensation of spaciousness or envelopment may arise, but one should be aware of the physics behind the process. Some of the arising comb filters are shown here, for spaced and ORTF setups.
No AES members have commented on this paper yet.
Subscribe to this discussion
Start a discussion!
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.