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componentes Descripción

Fabricante

BSP3505D

Baseband sound processor

Micronas 

BSP 3505D

2.2. BSP 3505D Audio Baseband Processing

All audio baseband functions are performed by digital

signal processing (DSP). The DSP functions are

grouped into three processing parts: input preproces-

sing, channel source selection, and channel postpro-

cessing (see Fig. 2–3).

The input preprocessing is intended to form a standard-

ized signal level.

All input and output signals can be processed simulta-

neously.

2.3. Clock and Crystal Specifications

Remark on using the crystal: External capacitors at

each crystal pin to ground are required. The higher the

capacitors, the lower the clock frequency results.

The nominal free running frequency should match the

center of the tolerance range between 18.433 and

18.431 MHz as closely as possible.

2.4. Digital Control Output Pins

The static level of two output pins of the BSP 3505D

(D_CTR_OUT0/1) is switchable between HIGH and

LOW by means of the I2C-bus. This enables the control-

ling of external hardware controlled switches or other

devices via I2C-bus (see section 4.4.11.)

PRELIMINARY DATA SHEET

Analog

Inputs

SCARTL

SCARTR

SCART

Prescale

Loudspeaker

Channel

AVC

Matrix

Bass

Treble

ȍ Loudness

Volume

Balance

Loudspeaker L

Loudspeaker R

Loudspeaker

Outputs

Beeper

SCART1

Channel

Matrix

SCART Internal signal lines (see Fig. 2–1)

Quasi-Peak

Detector

Fig. 2–3: Audio Baseband Processing (DSP-Firmware)

Quasi peak readout L

Quasi peak readout R

Volume

SCART1_L

SCART1_R

SCART

Output

6

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