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STA320 Datasheet(PDF) 17 Page - STMicroelectronics |
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STA320 Datasheet(HTML) 17 Page - STMicroelectronics |
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17 / 37 page  17/37 STA320 5.7.5 Master Volume Register 5.7.6 Channel 1 Volume 5.7.7 Channel 2 Volume 5.7.8 Channel 3 Volume The Volume structure of the STA320 consists of individual volume registers for each channel and a master volume register that provides an offset to each channels volume setting. The individual channel volumes are adjustable in 0.5dB steps from +48dB to -80 dB. As an example if C3V = 00h or +48dB and MV = 18h or -12dB, then the total gain for channel 3 = +36dB. The Master Mute when set to 1 will mute all channels at once, whereas the individual channel mutes(CxM) will mute only that channel. Both the Master Mute and the Channel Mutes provide a "soft mute" with the volume ramping down to mute in 4096 samples from the maximum volume setting at the internal processing rate(~96kHz). A "hard mute" can be obtained by commanding a value of all 1's(255) to any channel volume register or the master vol- ume register. When volume offsets are provided via the master volume register any channel that whose total volume is less than -80dB will be muted. All changes in volume take place at zero-crossings when ZCE = 1(configuration register F) on a per chan- nel basis as this creates the smoothest possible volume transitions. When ZCE=0, volume updates will occur immediately. Table 16. Master Volume Offset as a function of MV(7..0). D7 D6 D5 D4 D3 D2 D1 D0 MV7MV6 MV5 MV4 MV3MV2 MV1MV0 111111 11 D7 D6 D5 D4 D3 D2 D1 D0 C1V7 C1V6 C1V5 C1V4 C1V3 C1V2 C1V1 C1V0 011000 00 D7 D6 D5 D4 D3 D2 D1 D0 C2V7 C2V6 C2V5 C2V4 C2V3 C2V2 C2V1 C2V0 011000 00 D7 D6 D5 D4 D3 D2 D1 D0 C3V7 C3V6 C3V5 C3V4 C3V3 C3V2 C3V1 C3V0 011000 00 MV(7..0) Volume Offset from Channel Value 00000000(00h) 0dB 00000001(01h) -0.5dB 00000010(02h) -1dB …… 01001100(4Ch) -38dB …… 11111110(FEh) -127dB 11111111(FFh) Hard Master Mute |
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