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| 型号： | TAS3103DBT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| 封装： | GREEN, PLASTIC, TSSOP-38 |
| 文件页数： | 7/148页 |
| 文件大小： | 1247K |
| 代理商： | TAS3103DBT |
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345
Table 37. DRC Example 4 Parameters
DRC
PARAMETER
REQUIRED (SPECIFIED) VALUE
(NET GAINSAP Input-DRC = 0 dB)
I2C COEFFICIENT VALUE
T2
22 dBInput ≥ 70 dBDRC
70/6.0206= 11.626748
= 0x000005D0394825.23 Format
T1
102 dBInput ≥ 150 dBDRC
150/6.0206 = 24.91446
= 0x00000C750D0925.23 Format
O2
100 dB
(100 + 24.0824)/6.0206 = 20.609640
= 0x00000A4E08B025.23 Format
O1
0 dB
(0 + 24.0824)/6.0206
= 4.000000
= 0x00000200000025.23 Format
k2
1:1.4 Expansion
1.4 1 = 0.4 = 0X03333335.23 Format
k1
1:1 Transfer
(1/1) 1 = 1 1 = 2 = 0XF0000005.23 Format
k0
1:1.5 Expansion
1.5 1 = 0.5 = 0x04000005.23 Format
3.8
Spectrum Analyzer/VU Meter
The TAS3103 contains an I2C bus programmable function block that can serve as either a spectrum analyzer or a
volume unit (VU) meter. Figure 326 shows the structure of this function block and lists the I2C subaddress of the
parameters that control it.
The block consists of 10 biquad filters, each followed by an rms estimator and a logarithmic converter. Two nodes
provide input to the block, with each node servicing five of the 10 biquad filters. Audio from input node s can either
come exclusively from channel 1, channel 2, channel 3, or from a gain-weighted combination of these channels. Audio
from input node t can also come exclusively from either channel 1, channel 2, or channel 3, or from a gain-weighted
combination of these channels. The spectrum analyzer then can be used to divide the audio frequency band into ten
frequency bins to examine the spectrum of the audio data stream on channel 1, channel 2, channel 3, or any
combination of these channels. The spectrum analyzer can also be used to divide the audio frequency band into five
frequency bins to examine the spectral content of two of the channels independently.
The VU meter is a special case of the spectrum analyzer that uses only the outputs from biquad 5 and biquad 6.
Typically, for the VU meter, one channel would be routed to biquad 5 (node s) and a different channel would be routed
to biquad 6 (node t). Each biquad filter would be assigned a band pass transfer function that encompasses most of
the audio band, or the filter could be configured as a pass-through device to see the full spectral band. The two outputs
then would be a measure of the energy on the two channels. Other options for the VU meter are also available. For
example, by properly setting the coefficients on biquad 5 and biquad 6, the concurrent measurement of bass and
treble volume levels on a single channel could be made.
Mixer and summation elements preceding the two input nodes s and t provide a means of adjusting the spectrum
analyzer and VU meter outputs relative to the incoming audio data stream. The spectrum analyzer and VU meter
outputs are unsigned 5.3 format base 2 logarithmic numbers. The integer part of the number designates the most
significant bit (in the 48-bit digital audio processor DAP word) occupied by the magnitude of the rms estimate of
the biquad filter output. A value of 31 means the magnitude of the rms estimate occupies bit 47 of the 48-bit DAP word
(bit 48 is the sign bit, and using the absolute value of the biquad filter output in determining the rms estimate makes
this bit always 0 in value). A value of 30 means the magnitude of the rms estimate occupies bit 46 and this pattern
continues with a value of 1 signifying the magnitude of the rms estimate occupies bit 17. A value of 0 signifies that
the magnitude of the rms estimate is below bit 17. The fractional digits in the 5.3 formatted number are simply the
three bits below the most significant data bit. If the rms estimate lies below bit 16 of the 48-bit DAP word, the spectrum
analyzer/VU meter output is 0.0. Figure 327 gives examples of logarithmic outputs for different 48-bit rms estimate
values.
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