Audio Engineering Society. Convention Paper. Presented at the 120th Convention 2006 May Paris, France

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1 Audio Engineering Society Convention Paper Presented at the 1th Convention May 3 Paris, France! " ")*)+, A System for Head Related Impulse Responses Rapid Measurement and Direct Customization Simone Fontana 1, Angelo Farina and Yves Grenier 3 1 Ecole Nationale Supérieure des Télécommunications, Paris, France fontana@tsienstfr Università di Parma, Parma, Italia farina@pcfarinaenguniprit 3 Ecole Nationale Supérieure des Télécommunications, Paris, France grenier@tsienstfr ASTRACT!"!"!"!" 1 INTRODUCTION ) *

2 Fontana et al +, -φ θ / φ θ - - / * "!" : ;3!51 <!" ):3<5, >5 1 " 3? @5 1!"!"!" * / 1 3 AES 1th Convention, Paris, France, May 3 Page of

3 Fontana et al +!"1A) ; 1! < > PRELIMINARY REMARKS 1 Time-frequency remarks log Hf) Effect of sampling time window at 5 Hz Frequency samples 1 samples 1 samples Effect of sampling time window at 1 Hz 5 samples 1 samples C A D ; << 9 9 log Hf) Frequency C AES 1th Convention, Paris, France, May 3 Page 3 of

4 Fontana et al η!! )!)!) Frequency resolution: andwidth 3d/f Samples Number Frequency resolution at 5 Hz D 9< Space-time remarks E 1 *!" ) >? 9F 9F <! << F< 99 9 F 9F 9@ 9!!?! 9!!??? 99 9<!* + * * 3 SYSTEM CHARACTERIZATION 8: :D9< 9< 8: > G > > > : E99 ) 8: AES 1th Convention, Paris, France, May 3 Page of

5 Fontana et al D 3F5 8:8: 31 Electronic chain C <9 < <>:E9 < log1 Hf) Tannoy System transfer function IRCAM Tranfer function Measured Tranfer function !,- --/1 D 8: : E9 8: D f!) 9 9E : E99 : E99 > D : E99,F) : E9 9< 1!)F 9 9< D <!!9 <), log1 Hf) MKE MK measured transfer functions f MK MK!,- - - AES 1th Convention, Paris, France, May 3 Page 5 of

6 Fontana et al room impulse response 1 3 log1absht)) D!" D > time 8 1 " 1 / 1 Electroacoustic chain D C 9? < 9 < < > > ) 5 9 9! < > >< >< >< >< >< >< 7! F > > >!*, ) F 1 9? AES 1th Convention, Paris, France, May 3 Page of!f

7 Fontana et al > < *log1 ht) 8 Ancient Impulse Response Time <! 8 Loudspeaker 1 and Tranfer Functions To centre Impulse Response comparison New Impulse Response *log1 Hf) *log1 ht) 8 Loudspeaker 1 Loudspeaker Time 8 95!F < ) *log1 ht) 8 Room Impulse Response f Time 8 Loudspeaker and 5: Tranfer function to centre *log1 ht) 8 Impulse Response comparison Room and structure Impulse Response Time 9 33 System calibration *log1 Hf) 8 1 Loudspeaker Loudspeaker f AES 1th Convention, Paris, France, May 3 Page 7 of

Fontana et al ; 9 > MEASUREMENT : E99 331 System sensitivity to little variations of measurement points D: E99 @ " " < H I) 3 System characterization: conclusions >!

8 Fontana et al ; 9 > MEASUREMENT : E System sensitivity to little variations of measurement points D: " " < H I) 3 System characterization: conclusions >! ITDsamples) ITD in two different situations loudspeaker :!;- - > << > 8: 1 : E99, * 1 35 H : E99 > AES 1th Convention, Paris, France, May 3 Page 8 of

9 Fontana et al 1 3F5 5 PROCESSING, 1 9 > 99< 51 Equalization * J ) >!! ") * + ", ") - ") - " - ") - " + ) /", ") " " 5 / 5 " " - D / 5 AES 1th Convention, Paris, France, May 3 Page 9 of

10 Fontana et al 7 ) θ θ " : E 11 9 : 8 7 : / Electro-acoustic chain equalization D1 H D 35 D 1 D H 3<5 K K 8 L L K D, 9 : M D D 395 *, * 35 E13!5 AES 1th Convention, Paris, France, May 3 Page 1 of

11 Fontana et al </ < / 5- - F< F-, D H 5 DRC perfect DRC smoothed EQUALIZATION 1 1 DRC perfect DRC smoothed EQUALIZATION max deviation mean deviation loudspeaker ) < loudspeaker < 51 Separated equalization D D H E Electronic chain equalization D AES 1th Convention, Paris, France, May 3 Page 11 of

12 Fontana et al > < </ < / 5-? 9@ <!* </ < / - 9!* " D D 13 1 DIRECT perfect DIRECT smoothed EQUALIZATION max deviation DIRECT perfect DIRECT smoothed EQUALIZATION 11 mean deviation loudspeaker 8 < loudspeaker < D E Acoustic chain equalization H D - AES 1th Convention, Paris, France, May 3 Page 1 of

13 Fontana et al mean deviation DIRECT perfect DIRECT smoothed EQUALIZATION loudspeaker < 513 Conclusions < < ) H! max deviation DIRECT perfect DIRECT smoothed EQUALIZATION loudspeaker < < < D! <! Amplitude Esualized impulse response samples ;! 9< < 5 FREQUENCY DEPENDENT WINDOWING 51 Hard Frequency Dependent Time Windowing ; 9 FF?>?!> ) AES 1th Convention, Paris, France, May 3 Page 13 of

3 ;+ 1" D 1"D x 1 1 response windowing 18 8 1 Frequency 1 1

14 Fontana et al > 9> H < 9? 18 9@! 9< D Frequency Time ; D! 3 ;+ 1" D 1"D x 1 1 response windowing Frequency 1 1 amplitude Time ; samples - AES 1th Convention, Paris, France, May 3 Page 1 of

15 Fontana et al D *1"D H D 9F 1"D H *1"D, 1"D L + ; D D 1 N ) +;!> 5 Frequency-dependent-soft windowing 8 > 1"D" " 3<5 8 "8 D D 9F L + ; AES 1th Convention, Paris, France, May 3 Page 15 of

Fontana et al 1 1"D! 18 1 Frequency 1 1 1 8 5 1 15 Time +;!> HRIR DIRECT CUSTOMIZATION 8-8 8: ;C 1 CIPIC Database 11 Coordinates 8-8 <? 8-8 ; A 8 1 9??!" 9!

16 Fontana et al 1 1"D! 18 1 Frequency Time +;!> HRIR DIRECT CUSTOMIZATION 8-8 8: ;C 1 CIPIC Database 11 Coordinates 8-8 <? 8-8 ; A 8 1 9??!" 9!9 :+ θ 3<<5+ϕ 3<9!>95 >9 * > C 8-8 θ,ϕ 5! θ,ϕ?::?!! >9 >@? >9 >@? > >>@?!*3 8-8 C 3F5 1 Measurement and Compensation?8 AES 1th Convention, Paris, France, May 3 Page 1 of

17 Fontana et al >< ) 9 < 8-8 D K /-/ D /-/ K /-/ IRCAM LISTEN Database 8: ;C 8: - 1 9? <OPFOO C 1 Measurement and Compensation > E1J!!9F " 9 ;C 8-8 8: K / 3 DIRECT Customization K C " /-/ / ; C : D "1 E "!9 D H ψ 8 9 AES 1th Convention, Paris, France, May 3 Page 17 of

18 Fontana et al C INTEGRATIVE Direct Customization ϕ " 1!" !" 1 1 1, 1 H 9 1 * ; 1 ) 1 ) D, Q,C ) ; 1 ϕϑ Φ ϕ ; ; < ; ; : ; ; 9 ; ; Φ ; ; 1 ϕϑ 8 8 ϕϑ AES 1th Convention, Paris, France, May 3 Page 18 of

19 Fontana et al D Φ, Φ DΦ! Φ ϕ 7 CONCLUSIONS AND FUTURE WORKS F<<@<)?9@) ; <, 9! 8 REFERENCES 35 "CR " ;A- / 1 E SH"": "!;*A,- / - FF 9 : : C - CG H99<9 3!5, <5 ) E@ : ", C : : 7 A,@>"9 3>5 8 ) H "@ -A, >FF@ 3?5 8-; ; 8 8 * 7 7 -A,-1-8 : 9 3@5 8 1 G8;@9 - + "+! +; A F<?9! 3F5 :" ; -!-A,@ 89 1F99-1 AES 1th Convention, Paris, France, May 3 Page 19 of

20 Fontana et al 35 " - -- A FF> "A,<@<9 395 HE - ;7, D ; "AT 3!5, 777 3<5, 7 7 AES 1th Convention, Paris, France, May 3 Page of

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