TAS5504_06 datasheet(29/96 Pages) TI

номер детали	TAS5504

подробное описание детали	4 Channel Digital Audio PWM Processor

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Introduction

SLES123 − October 2004

TAS5504

1.9.1 Loudness Example

Problem: Due to the Fletcher-Munson phenomena, we want to compensate for low frequency attenuation near

60 Hz. The TAS5504 provides a loudness transfer function with EQ gain = 6, EQ center frequency = 60 Hz,

and EQ bandwidth = 60 Hz.

Solution: Using Texas Instruments ALE TAS5504 DSP tool, Matlab, or other signal-processing tool, develop

a loudness function with following parameters:

Table 1−7. Loudness Function Parameters

LOUDNESS

DESCRIPTION

USAGE

DATA

I2C

EXAMPLE VALUES

LOUDNESS

TERM

DESCRIPTION

USAGE

DATA

FORMAT

I C

SUBADDRESS

HEX

FLOAT

H (Z)

Loudness Biquad

Controls shape of

loudness curves

5.23

0x95

b0 = 00008ACE

b1 = 00000000

b2 = FFFF7532

a1 = FF011951

a2 = 007EE914

b0 = 0.004236

b1 = 0

b2 = −0.004236

a1 = −1.991415

a2 = 0.991488

Loudness Gain

Loudness function

5.23

0x91

FFC00000

−0.5

Loudness Offset

Loudness function

25.23

0x92

00000000

Gain

Switch to Enable

Loudness (ON = 1,

OFF = 0)

5.23

0x93

00800000

Offset

25.23

0x94

00000000

See Figure 1−16 for the resulting loudness function at different gains.

Figure 1−16. Loudness Example Plots

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