MAX5406 MAXIM [Maxim Integrated Products], MAX5406 Datasheet - Page 19

• Manufacturer Part Number: MAX5406
• Description: Audio Processor with Pushbutton Interface
• Manufacturer: MAXIM [Maxim Integrated Products]

Use the ambience function for boom boxes, head-
phones, desktop speakers, or other audio products
where the speakers are physically close together. A
stereo signal is designed to be played over speakers
that have a wide physical separation. The ears and
brain combine the sound from these two sources to
create a perception of sounds distributed in space. In
the case of headphones, this wide physical separation
does not exist, resulting in the sound apparently com-
ing from somewhere inside the head. A similar situation
exists when the speakers are not widely separated, for
example when they are located on a desk or inside a
Figure 11a. Wiper Transition Timing Diagram (No Zero Crossing Detected)
Audio Processor with Pushbutton Interface
______________________________________________________________________________________
PUSHBUTTON PRESSED
1
0
Ambience Control
L1_H
L1_L
IS BOUNCING
CONTACT
SWITCH
DEBOUNCE BY
WAITING FOR
STABLE LOW,
IS STABLE
CONTACT
SWITCH
t
t
LPW
LPW
(t
LPW
+ t
CROSSING OR
TIMEOUT, t
WS
FIRST ZERO
WAIT FOR
INPUT ACCEPTED
)
t
WS
single enclosure. One way to compensate for this is to
increase the apparent separation of the L and R signals
arithmetically. The L and R signals can be modeled as
a channel-specific component added to a monocompo-
nent. To emphasize the channel-specific component,
one needs to remove the opposite channel-specific
component from the monocomponent.
This function is accomplished with circuitry inside the
MAX5406 and external network. Control the ambience
effect with the AMB button that toggles between wide
(full effect) and normal (no ambience effect). Use the fol-
lowing equations for matrix surround (fixed ambience):
WS
WIPER MOVES HERE
IS BOUNCING
CONTACT
SWITCH
STABLE HIGH, t
DEBOUNCE BY
WAITING FOR
t
HPW
HPW
READY TO ACCEPT
ANOTHER BUTTON PRESS
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