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參數(shù)資料
| 型號(hào)： | TAS3103IDCP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| 封裝： | PLASTIC, HTSSOP-38 |
| 文件頁(yè)數(shù)： | 119/148頁(yè) |
| 文件大?。?/td> | 1247K |
| 代理商： | TAS3103IDCP |
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313
CAUTION: There is no soft transition implemented when changing bass and treble filter
sets; soft transitions only apply when adjusting gains (shelves) within a given filter set.
The variable TBLC should be set so that the dwell time at each shelf is never less than
32 audio sample periods; otherwise audio artifacts could be introduced into the audio
data stream.
Figure 312 summarizes the bass and treble adjustments available within each monaural channel. As noted in
Figure 312, the 3-dB frequency for the bass filter sets decreases in value as the filter set number is increased,
whereas the 3-dB frequency for the treble filter set increases in value as the filter set number is increased. The valid
selection for bass and treble sets ranges from 1 to 5.
Table 32 and Table 33 list, respectively, the bass and treble filter shelf selections for all 1/2 dB settings between
18-dB cut and 18-dB boost. The treble and bass selections are not the same, and the delta in the selection values
between 1/2 dB points are not constant across the 36-dB range. Table 32 and Table 33 do not list all 150 filter shelf
selections, but all 150 selection values for both bass and treble are valid, allowing the use of linear potentiometer or
GUI-based sliders. Table 32 and Table 33 are provided for those applications requiring the adjustment of bass and
treble in 1/2 dB steps.
CAUTION: Filter set selections 6 and 7 are illegal. Filter shelf selections 0 and 151
through 255 are illegal. Programming an illegal value could result in erratic and
erroneous behavior.
As an example, consider the case of a 44.1-kHz audio sample rate. For this audio rate it is desired to have, for all
three monaural channels
A 3-dB bass shelf corner frequency of 100 Hz
A bass shelf volume boost of 9 dB
A 3-dB treble shelf corner frequency of 8.1 kHz
A treble shelf volume cut of 4 dB
Bass and treble filter set selections can be made by referring to Figure 312. For a 44.1-kHz audio sample rate, filter
set 5 provides a 3-dB bass corner frequency at 115 Hz, and filter set 3 provides a 3-dB treble corner frequency at
8.269 kHz. These corner frequencies are the closest realizable corner frequencies to the specified 100-Hz bass and
8.1-kHz treble corner frequencies.
Table 32 provides the indices for achieving specified bass volume levels. An index of 0x55 yields a bass shelf gain
of 9 dB, which matches the specified shelf volume boost of 9 dB. Table 33 provides the indices for achieving specified
treble volume levels. An index of 0x7A yields a treble shelf cut of 4 dB (4-dB gain), which matches the specified shelf
volume cut of 4 dB.
Figure 313 presents the resulting subaddress entries required to implement the parameters specified in the bass
and treble example.
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