CS4525 datasheet(29/91 Pages) CIRRUS

29 / 91 page

DS726A1

CS4525

6.1.4

Digital Sound Processing

The CS4525 implements flexible digital sound processing operations including bass management cross-

over, 2-way speaker crossovers, high- and low-pass shelving filters, programmable parametric EQ filters,

adaptive loudness compensation, channel mixers, and volume controls.

The digital signal flow is shown in Figure 14 below. The signal processing blocks are described in detail

in the following sections.

6.1.4.1

Pre-Scaler

Applying any gain to a full-scale signal in the digital domain will cause the signal to clip. To prevent this,

a pre-scaler block is included prior to the internal digital signal processing blocks. This allows the input

signal to be attenuated before processing to ensure that any signal boosting, such as gain in a shelving

filter, will not cause a channel to clip.

The pre-scaler block allows up to -14.0 dB of attenuation in 2.0 dB increments and is controlled with the

PreScale[2:0] bits.

Referenced Control

PreScale[2:0]....................... “Pre-Scale Attenuation (PreScale[2:0])” on page 70

Amplifier

Out 1

Amplifier

Out 2

Amplifier

Out 3

Amplifier

Out 4

PWM Modulator

Output 2

Audio

Processing

High-Pass

Bass/Treble

2-Ch Mixer

2.1 Bass Mgr

De-Emphasis

Serial Audio

Input Port

Volume

Auxiliary

Serial Port

Serial Audio

Delay

Interface

PWM

Output

Config

Gate

Drive

Power

Stage

Gate

Drive

Power

Stage

Gate

Drive

Power

Stage

Gate

Drive

Power

Stage

Stereo

Analog In

Serial Audio

Clocks & Data

Serial Audio

Data I/O

Serial Audio

Clocks & Data

PWM Modulator

Output 1

Ch. A HPF

Ch. A LPF

Ch. B HPF

Ch. B LPF

Ch. A HPF

Ch. A LPF

Serial Audio

Data In

Left

Right

Ch. B HPF

Ch. B LPF

Ch. 1

Ch. 2

Aux Serial Data Select

Data to

Aux Port

Ch. 3

Parametric EQ

Linkwitz-Riley

Crossover

Adaptive

Loudness

Compensation

High-

Pass

ADC

Loudness

Ch. A

Ch. B

LFE

Temperature Sense

Param EQ 4 - 5

Sample

Rate

Converter

PWM

Modulator

Ch. 3

Sample

Rate

Converter

PWM

Modulator

Ch. 2

Sample

Rate

Converter

PWM

Modulator

Ch. 1

Foldback

Temperature

Sense

Figure 14. Digital Signal Flow

CS4525 Datenblatt(PDF) 29 Page - Cirrus Logic

CS4525 Datenblatt(HTML) 29 Page - Cirrus Logic

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91

Datenblatt Download

Link URL