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TEA6886

Up-level Car radio Analog Signal Processor (CASP)

Philips Electronics 

Philips Semiconductors

Up-level Car radio Analog Signal

Processor (CASP)

Product specification

TEA6886HL

For the period of fast RDS updating soft mute, SNC and

HCC can be put on hold. The AM wideband peak detector

and the ultrasonic noise peak detector are reset by a

switch signal delivered from the TEA6840H via pin

FMHOLD.

The six separate detecting circuits are as follows:

1. The AM wideband noise peak detector is driven from

a 20 kHz band-pass filter connected to the level buffer

output. The time constant is defined by an external

capacitor connected to pin TWBAM2. The output

voltage of the detector is analog-to-digital converted

by a 3-bit ADC.

2. The AM wideband noise average detector is driven

from a 20 kHz band-pass filter connected to the level

buffer output. The time constant is defined by an

external capacitor connected to pin TWBAM1. The

output of the detector is connected to the Stereo Noise

Control (SNC) circuit.

3. The ultrasonic noise peak detector is driven from a

60 kHz high-pass filter connected to the MPX signal

from pin MPXRDS. The time constant is defined by an

external capacitor connected to pin TUSN2. The

output voltage of the detector is analog-to-digital

converted by a 3-bit ADC.

4. The ultrasonic noise average detector is driven from a

60 kHz high-pass filter connected to the MPX signal

from pin MPXRDS. The time constant is defined by an

external capacitor connected to pin TUSN1. The

output of the detector is connected to soft mute control

and stereo noise control circuits.

5. For soft mute and high cut control purposes an

average detector with an externally defined time

constant (TMUTE) is provided. The detector is driven

by level output only. Soft mute and high cut control can

be switched off via the I2C-bus.

6. The stereo noise control peak detector with an

externally defined time constant (TSNC) is driven by

DC level output, AM wideband and ultrasonic noise

outputs. It provides the stereo blend facility (SNC). The

starting point and slope of the stereo blend can be

chosen via the I2C-bus controlled reference voltage.

7.5 Tone/volume control

The tone/volume control part consists of the following

functions:

• Source selector

• Loudness

• Volume 1

• Treble

• Bass

• Volume 2

• Rear Seat Audio (RSA) selector

• Chime adder

• Analog step interpolation

• Audio blend control.

The stages loudness, volume 1, bass and volume 2

include the Analog Step Interpolation (ASI) function. This

minimizes pops by smoothing out the transitions in the

audio signal during switching. The transition time is

I2C-bus programmable in a range of 1 : 24 in four steps.

The stages loudness, volume 1 and volume 2 also have

the Audio Blend Control (ABC) function. This minimizes

pops by automatically incrementing the volume and

loudness controls through each step between their present

settings and the new settings. The speed of the ABC

function is correlated with the transition time of the ASI

function.

All stages are controlled via the I2C-bus.

7.5.1 SOURCE SELECTOR

The source selector allows the selection between

6 sources:

• 2 external stereo inputs (ALI, ARI, BLI and BRI)

• 1 external symmetrical stereo input (CLIP, CRIP and

CCOM)

• 1 external symmetrical mono input (MONOP and

MONON)

• 1 internal stereo input (AM/FM)

• 1 chime/diagnostic mono input (CHIME).

A chime input signal can be sent to any audio output, at

any volume level, via the chime/diagnostic mono input.

2000 Nov 21

11

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