EP 0948875 A1 19991013 - PROCESSING AUDIO SIGNALS
Title (en)
PROCESSING AUDIO SIGNALS
Title (de)
VERARBEITUNG VON AUDIOSIGNALEN
Title (fr)
ENSEMBLE CAPTEUR CAPACITIF
Publication
Application
Priority
- GB 9703514 W 19971222
- GB 9627015 A 19961228
Abstract (en)
[origin: WO9830064A1] A filter for processing audio signals to implement a predetermined HRTF, the filter comprising an FIR filter of a desired order having tapping points (T1 to T25) connected to respective coefficient multipliers (6) and thence to a common summing means (8). The values of the coefficients for the multipliers (8) are calculated as follows: (a) providing a time-domain impulse response of the said predetermined HRTF and applying a predetermined window function to the response to produce a simplified HRTF, (b) computing the transfer function of the simplified HRTF and comparing the transfer function of the simplified HRTF with the said predetermined HRTF in a low frequency region of about 100 Hz to determine an error value between the functions of the simplified and predetermined HRTFs for this frequency region, (c) modifying the response of the predetermined HRTF in dependence upon the error, and repeating steps (a) and (b); and (d) repeating steps (a), (b) and (c) a desired number of times until a desired level of accuracy is achieved.
IPC 1-7
IPC 8 full level
CPC (source: EP)
Citation (search report)
See references of WO 9830064A1
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 9830064 A1 19980709; EP 0948875 A1 19991013; GB 9627015 D0 19970219
DOCDB simple family (application)
GB 9703514 W 19971222; EP 97950301 A 19971222; GB 9627015 A 19961228