HEAD acoustics. Standards on Audio Quality - from a system-level view. H. W. Gierlich HEAD acoustics GmbH.
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1 HEAD acoustics Standards on Audio Quality - from a system-level view H. W. Gierlich HEAD acoustics GmbH 27-Mar-03 #1
2 Overview Reference Points and Equalization free field-/diffuse field equalization DRP - ERP MRP How to Measure Non Linear Signal Processing test signals and analysis evaluation examples 27-Mar-03 #2
3 Headset & Signal Processing EC Noise reduction Levelcontrol Coder Microphon - NLP NR Coder Buffer, Packetization IP ECHO H(f ) + Decoder Buffer, PLC IP Loudspeaker EC CN Limiter AGC, Compression Comfort Noise 27-Mar-03 #3
4 Acoustical Access P jpg 27-Mar-03 #4
5 Artificial Head Technology Equalization for Audio Reference Point Free Field 27-Mar-03 #5
6 Reference Points in Telephonometry - HATS HRP (hats reference point) Lip ring DRP HATS Reference Point (and top view of axis of rotation). It bisects the line joining the Ear canal Entrance Points (EEPs) Transverse plane (drum reference point) 90 Vertical plane (symmetry plane) Reference axis Axis of rotation 90 Vertex Mouth-ear reference plane Reference plane Horizontal plane HATS Reference Point (HRP) ERP (ear reference point) T Lip plane MRP Transverse plane MRP/lip ring (mouth reference point) 27-Mar-03 #6
7 Freefield DRP ERP 25,0 Freefield <-> DRP! Freefield -> ERP response (db) 20,0 15,0 10,0 5,0 0,0-5,0-10,0-15,0 Receiving frequency response SDE (db) characteristics requirements in audio and in telecom: a contradiction? -20, f (Hz) Free-field response P. 58 (db) "Optimum" ERP response 27-Mar-03 #7
8 Freefield ERP - Narrowband 25,0 response (db) 20,0 15,0 10,0 5,0 0,0-5,0 Free-field response P. 58 (db) SDE (db) "Optimum" ERP response upper tolerance narrow band low er tolerance narrow band -10,0-15,0-20, f (Hz) 3GPP TS Mar-03 #8
9 Freefield ERP - Wideband 25,0 20,0 response (db) 15,0 10,0 5,0 0,0-5,0-10,0-15,0 Free-field response P. 58 (db) SDE (db) "Optimum" ERP response upper tolerance w ideband low er tolerance w ideband TIA , f (Hz) 27-Mar-03 #9
10 Diffuse-Field - ERP 20,0 15,0 response (db) 10,0 5,0 0,0-5,0 Diffuse-field response P. 58 (db) SDE (db) "Optimum" ERP response upper tolerance w ideband low er tolerance w ideband -10,0-15,0-20, f (Hz) 27-Mar-03 #10
11 Acoustical Access Adaptation of the frequency response requirements for headphones and headsets possible within the tolerances of telecommunication standards Reference point for frequency response requirements of minor importance: freefield or ERP can be transformed easily given that the open ear correction SDE is appliccable Loudness Ratings have to be calculated at ERP: ITU-T P Mar-03 #11
12 Overview Reference Points and Equalization free field-/diffuse field equalization DRP - ERP MRP How to Measure Non Linear Signal Processing test signals and analysis evaluation examples 27-Mar-03 #12
13 Headset & Signal Processing EC Noise reduction Levelcontrol Coder Microphon - NLP NR Coder Buffer, Packetization IP ECHO H(f ) + Decoder Buffer, PLC IP Loudspeaker EC CN Limiter AGC, Compression Comfort Noise 27-Mar-03 #13
14 Composite Source Signal (P.501) s(t) CSS: Signal construction A B C A - Voiced sound B - Noise sequence (e.g. pseudo random noise) C - Pause 27-Mar-03 #14
15 Composite Source Signal 27-Mar-03 #15
16 Artificial Voice (P.50) 27-Mar-03 #16
17 Frequency Responses All All Signals with with ONE Headset Red: Sweep Green: CSS CSS 10 db White: Artificial Voice 27-Mar-03 #17
18 Level Control (AGC, Companding) 8 db Set 2 Voice-like Sound with Set 1 Level Variation 10 db 27-Mar-03 #18
19 Level Control (AGC, Companding) Set 1 10 db Set Mar-03 #19
20 Switching Characteristics Several blocks of CS-Signals in receiving to activate NLP 340 ms 30 db Set 1 Switching from receiving to sending 27-Mar-03 #20
21 Double Talk Combination of two Composite Source Signals (CSS) green: near end signal red: far end signal analysis single talk Signal description in ITU-T Recommendation P.501 Description of analysis methods in ITU-T P Mar-03 #21
22 Double Talk Analysis in sending direction based on the CSS hands-free telephone 1 Analyse Einzelsprechen temporal clipping under double talk conditions Listening example: male voice (driver), click here! -> 27-Mar-03 #22
23 Summary Acoustical access of headsets can be made easily using artificial head technology Acoustical reference points can be transformed easily (if current SDE can be used) More speech like test signals are required for modern headset systems Advanced analysis techniques are required in order to assess the speech quality in sending, receiving, double talk, Mar-03 #23
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