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Reproduced Sound 25 Dr Bruce Wiggins Tom Spenceley Signal Processing Applications Research Group University of Derby DISTANCE CODING AND PERFORMANCE OF THE MARK 5 AND ST350 SOUNDFIELD MICROPHONES AND THEIR SUITABILITY FOR AMBISONIC REPRODUCTION [email_address] http://www.derby.ac.uk/staff-search/dr-bruce-wiggins
Ambisonics - What is it? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Ambisonic Encoding – B Format ,[object Object],[object Object]
Proximity/Near Field Effect ,[object Object],[object Object]
Proximity/Near Field Effect ,[object Object],Depends on Distance Depends on Distance & Frequency
Proximity/Near Field Effect ,[object Object],Source at 1m Source at 0.5m
Speaker Compensation ,[object Object],[object Object],[object Object],[object Object]
Near-Field Compensation ,[object Object],[object Object],[object Object],[object Object],[object Object]
NFC Filters for 1m (solid) and 3m source with a speaker distance of 1.5m
Aims of this Work ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Why would the Mics be different? – A to B Format Pre-filter A Pre-filter B Pre-filter C Pre-filter D Degree 0 Filter Degree 1 Filter Degree 1 Filter Degree 1 Filter W = (A+B+C+D) X = (A+C)–(B+D) Y = (A+B)–(C+D) Z = (A+D)–(B+C)
Procedure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],X Y x
Results – ST350
Results - ST350
ST350 Calibration Amplitude
ST350 Calibration Phase
Results - MKV
Results – MKV
Results – MKV Amplitude
Results – MKV Phase
Results - Summary ,[object Object],[object Object]
Conclusions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Ambsionic Decoding in Software ,[object Object]
Further Work ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Questions? ,[object Object]

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Distance Coding And Performance Of The Mark 5 And St350 Soundfield Microphones And Their Suitability For Ambisonic Reproduction