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STA323W Datasheet(PDF) 51 Page - STMicroelectronics |
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STA323W Datasheet(HTML) 51 Page - STMicroelectronics |
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51 / 77 page  STA323W Register descriptions 51/77 When set to 1, the Master Mute will mute all channels, whereas the individual channel mutes (CxM) will mute only that channel. Both the Master Mute and the Channel Mutes provide a “soft mute”, that is, a gradual muting with the volume ramping down to mute in 4096 samples from the maximum volume setting at the internal processing rate of circa 96 kHz. A “hard mute” can be obtained by setting a value of 0xFF in any channel volume register or the master volume register. When volume offsets are provided, via the master volume register, any channel whose total volume is less than -100 dB is muted. All changes in volume take place at zero-crossings when ZCE = 1 (configuration register E) on a per channel basis as this creates the smoothest possible volume transitions. When ZCE = 0, volume updates occur immediately. The STA323W also features a soft-volume update function. When SVE = 1 (in configuration register E) the volume ramps between intermediate values when the value is updated, This feature can be disabled by setting SVE = 0. Each channel also contains an individual channel volume bypass. If a particular channel has volume bypassed via the CxVBP = 1 register then only the channel volume setting for that particular channel affects the volume setting, the master volume setting does not affect that channel. Also, master soft-mute does not affect the channel if CxVBP = 1. Each channel also contains a channel mute. If CxM = 1 a soft mute is performed on that channel. Table 50. Master volume offset as a function of MV[7:0] MV[7:0] Volume offset from channel value 00000000 (0x00) 0 dB 00000001 (0x01) -0.5 dB 00000010 (0x02) -1 dB …… 01001100 (0x4C) -38 dB …… 11111110 (0xFE) -127 dB 11111111 (0xFF) Hard Master Mute Table 51. Channel volume as a function of CxV[7:0] CxV[7:0] Volume 00000000 (0x00) +48 dB 00000001 (0x01) +47.5 dB 00000010 (0x02) +47 dB …… 01100001 (0x5F) +0.5 dB 01100000 (0x60) 0 dB 01011111 (0x61) -0.5 dB …… |
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