參數(shù)資料
型號(hào)： TAS5504PAGG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： GREEN, PLASTIC, TQFP-64
文件頁數(shù)： 20/96頁
文件大小： 1216K
代理商： TAS5504PAGG4
Introduction
19
SLES123 October 2004
TAS5504
1.8.1 Auto Mute and Mute
The TAS5504 has individual channel automute controls that are enabled via the I2C interface. There are two
separate detectors used to trigger the automute:
Input Auto Mute: All channels are muted when all 8 inputs to the TAS5504 are less in magnitude than the
input threshold value for a programmable amount of time.
Output Auto Mute: A single channel is muted when the output of the DAP section is less in magnitude than
the input threshold value for a programmable amount of time.
The detection period and thresholds for these two detectors are the same.
This time interval is selectable via I2C to be from 1 ms. to 110 ms. The increments of time are 1, 2, 3, 4, 5, 10,
20, 30, 40, 50, 60, 70, 80, 90, 100, and 110 ms. This interval is independent of the sample rate. The default
value is mask programmable.
The input threshold value is an unsigned magnitude that is expressed as a bit position. This value is adjustable
via I2C. The range of the input threshold adjustment is from below the LSB (bit position 0) to below bit position
12 in a 24 bit input data word (bit positions 8 to 20 in the DSPE). This provides an input threshold that can be
adjusted for 12 to 24 bits of data. The default value is mask programmable.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
DVD Data Range
CD Data Range
Threshold Range
24-Bit Input
32-Bit in DSPE
Representation
Figure 114. Auto Mute Threshold
The auto mute state is exited when the TAS5504 receives one sample that is greater that the output threshold.
The output threshold can be one of two values:
Equal to the input threshold
6 dB (one bit position) greater than the input threshold
The value for the output threshold is selectable via I2C. The default value is mask programmable.
The system latency enables the data value that is above the threshold to be preserved and output.
A mute command initiated by automute, master mute, individual I2C mute, the AM interference mute
sequence, or the bank switch mute sequence overrides an unmute command or a volume command. While
a mute command is activated, the commanded channels transition to the mute state. When a channel is
unmuted, it goes to the last commanded volume setting that has been received for that channel.
1.9
Loudness Compensation
The loudness compensation function compensates for the Fletcher-Munson loudness curves. The TAS5504
loudness implementation tracks the volume control setting to provide spectral compensation for weak low or
high frequency response at low volume levels. For the volume tracking function both linear and log control laws
can be implemented. Any biquad filter response can be used to provide the desired loudness curve. The
control parameters for the loudness control are programmable via the I2C interface.
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