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WM8955 Datasheet(PDF) 17 Page - Wolfson Microelectronics plc |
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WM8955 Datasheet(HTML) 17 Page - Wolfson Microelectronics plc |
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17 / 43 page  Product Preview WM8955L w Product Preview Rev 0.4 May2003 17 TONE CONTROL The WM8955L provides separate controls for bass and treble with programmable gains and filter characteristics. This function operates on digital audio data before it is passed to the audio DACs. Bass control can take two different forms: • Linear bass control: bass signals are amplified or attenuated bya user programmable gain. This is independent of signal volume, and veryhigh bass gains on loud signals maylead to signal clipping. • Adaptive bass boost: The bass volume is amplified bya variable gain. When the bass volume is low, it is boosted more than when the bass volume is high. This method is recommended because it prevents clipping, and usuallysounds more pleasant to the human ear. Treble control applies a user programmable gain, without anyadaptive boost function. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 7BB 0 Bass Mode 0 = Linear bass control 1 = Adaptive bass boost 6 BC 0 Bass Filter Characteristic 0 = Low Cutoff (130 Hz at 48kHz sampling) 1 = High Cutoff (200 Hz at 48kHz sampling) Bass Intensity Code BB=0 BB=1 0000 +9dB 15 (max) 0001 +9dB 14 0010 +7.5dB 13 … (1.5dB steps) … 0111 0dB 8 … (1.5dB steps) … 1011-1101 -6dB 4-2 1110 -6dB 1 (min) R12 (0Ch) Bass Control 3:0 BASS 1111 (OFF) 1111 Bypass (OFF) 6 TC 0 Treble Filter Characteristic 0 = High Cutoff (8kHz at 48kHz sampling) 1 = Low Cutoff (4kHz at 48kHz sampling) R13 (0Dh) Treble Control 3:0 TRBL 1111 (Disabled) Treble Intensity 0000 or 0001 = +9dB 0010 = +7.5dB … (1.5dB steps) 1011 to 1110 = -6dB 1111 = Disable Table 3 Tone Control Note: 1. All cut-off frequencies change proportionallywith the DAC sample rate. |
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