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4−3
4.6 Bass Control
The bass gain level can be adjusted within the range of 15 dB to −15 dB with 0.5-dB step resolution. The level changes
are accomplished by downloading bass codes (shown in NO TAG) into the bass frequency control register.
Alternatively, a limited range of bass control is available by asserting the bass-up or bass-down GPI terminal (see
Section 7.6.1).
Bass control is a shelf filter with a corner frequency of 250 Hz at a 48-kHz sample rate.
The gain values for bass control can be found in Section NO TAG.
4.7 De-Emphasis Mode (DM)
De-emphasis is implemented in the DAC and is software controlled. De-emphasis is valid at 44.1 kHz and 48 kHz.
To enable de-emphasis, values are written into the analog control register via the I
2
C command. See Section 4.8 for
analog control register operation.
Figure 4−2 illustrates the frequency response of the de-emphasis mode.
Response (dB)
3.18
(50 µs)
10.6
(15 µs)
Frequency (kHz)
De-Emphasis
Figure 4−2. De-Emphasis Mode Frequency Response