SSM-2005 Просмотр технического описания (PDF) - Analog Devices

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SSM-2005

CS-5.1® Decoder 5.1-Channel Soundfield Generator

Analog Devices 

SSM2005

Power-Up

The SSM2005 will be in an undefined mode on power-up. Reset

should be applied to the SSM2005, or the mode control logic

should be loaded to put the device into a definite mode state.

Serial Data Control Inputs

The SSM2005 provides a simple 3- or 4-wire serial interface to

control the mode settings for the device. Data is input on the

DATA IN pin, while CLOCK IN is the serial clock. Data can be

shifted into the SSM2005 at clock rates up to 1 MHz.

The shift register clock at CLOCK IN is enabled when the

WRITE input is low. The WRITE pin can therefore be used as a

chip select input. However, the shift register contents are not

transferred into the register banks until the rising edge of LOAD.

For a traditional 3-wire serial interface, WRITE and LOAD

should be tied together. Figure 7 shows the timing diagram and

minimum timing requirements for the digital interface.

To enable a data transfer, the WRITE and LOAD inputs are

driven low. The 8-bit serial data, formatted MSB first, should

be fed to DATA IN and clocked into the shift register on the

rising edge of CLOCK IN. The new mode setting will then

activate on the rising edge of WRITE and LOAD.

STEREO

INPUTS

L

R

AUTO BALANCE

AND MUTE

CENTER CHANNEL

CANCEL

LEFT

RIGHT

PRECISION

SUM AND

DIFFERENCE

AMPLIFIERS

L+R = CENTER

L–R = SURROUND

STEERING CONTROL GENERATOR

CROSSOVER

NETWORK

CENTER

SURROUND

HIGH BAND

CHANNEL

STEERING

VCAs

SURROUND

LOW BAND

7X

OUTPUT

AMPLIFIERS

CIRCLE

SURROUND

OUTPUTS

L

R

AMPLIFIERS

C

LS

RS

MODE CONTROL LOGIC

RESET

CLOCK

DATA SERIAL BUS

SELECT

LOAD

TO SUBWOOFER

FILTER

Figure 6. Block Diagram

NOISE

GENERATOR

+V GND ؊V ACOM

INPUT POWER

Modes

Video

Music

5-2-5

4-2-4

Center On

Phantom Center

Sound Spread On

Sound Spread Off

Autobalance On

Autobalance Off

Noise Off

Noise On

Table II. Modes List

Effect

Center Channel Cancellation Active

Center Cancel Cancellation Off; Center Reduced by –4 dB.

5-Channel Circle Surround Enabled

4-Channel Matrix Enabled

Center Channel Output On

Center Channel Output Off; Divided and Added to LF and RF

Hard Panned Input Steered to Front and Rear Side

Hard Panned Input Steered to Front Side Only

Balances L and R to ± 1 dB

Autobalance Disabled

Noise Generator Disabled

Noise Generator On; Inputs Muted

–8–

REV. 0

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