|Dimensions||1525μm x 1525μm|
|Power||1 mW, 1MHz 1.8V|
In this project a co-processor to the ADSP21639 digital signal processor has been designed that calculates Head Related Transfer Functions (HRTF) that are used to transform an audio recording to create an effect of being in the room as the original recording.
For Headphone 3D surround reproduction of multichannel recordings, direct sound and early reflections of the loudspeakers for which the content has been created must be HRTF processed. When the listener turns his head, the HRTFs need to be changed to match the new angles. The HRTF application can be separated into processing of the first 50ms which are head-angle dependent (direct sound and early reflections) and processing following the 50ms which is head-angle independent (diffuse sound). This processing can be performed by digital signal processors (DSP). But the angle-dependent part can hardly be handled by a single DSP which also is loaded with other tasks.