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WM9713LGEFL/V Datasheet(PDF) 35 Page - Wolfson Microelectronics plc |
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WM9713LGEFL/V Datasheet(HTML) 35 Page - Wolfson Microelectronics plc |
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35 / 108 page  Pre-Production WM9713L w PP Rev 3.0 June 2006 35 3D STEREO ENHANCEMENT The 3D stereo enhancement function artificially increases the separation between the left and right channels by amplifying the (L-R) difference signal in the frequency range where the human ear is sensitive to directionality. The programmable 3D depth setting controls the degree of stereo expansion introduced by the function. Additionally, the upper and lower limits of the frequency range used for 3D enhancement can be selected using the 3DFILT control bits. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 40h General Purpose 13 3DE 0 (disabled) 3D enhancement enable 5 3DLC 0 Lower Cut-off Frequency 0 = Low (200Hz at 48kHz sampling) 1 = High (500Hz at 48kHz sampling) 4 3DUC 0 Upper Cut-off Frequency 0 = High (2.2kHz at 48kHz sampling) 1 = Low (1.5kHz at 48kHz sampling) 1Eh DAC 3D Control 3:0 3DDEPTH 0000 3D Depth 0000: 0% (minimum 3D effect) 0001: 6.67% …(6.67% steps) 1110: 93.3% 1111: 100% (maximum) Table 18 Stereo Enhancement Control Note: 1. All cut-off frequencies change proportionally with the DAC sample rate. VOICE DAC VXDAC is a 16-bit mono DAC intended for playback of Rx voice signals input via the PCM interface. Performance has been optimised for operating at 8ks/s or 16ks/s. The VXDAC will function at other sample rates up to 48ks/s, but this is not recommended. The analogue output of VXDAC is routed directly into the output mixers. The signal gain into each mixer can be adjusted at the mixer inputs using control register 18h. When not in use the VXDAC can be powered down using the Powerdown register bit VXDAC (register 3Ch, bit 12). |
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