sm5953a Nippon Precision Circuits Inc, (NPC), sm5953a Datasheet - Page 8

• Manufacturer Part Number: sm5953a
• Description: Surround Effects Processor Lsi
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

FUNCTIONAL DESCRIPTION
Surround Function
The SM5953A adds reflected sound components, internally delayed signals stored in SRAM, to the raw data
direct sound components in order to achieve surround sound effects. The L + R and L − R reflected sound
components are read out from the address determined by the delay scaling value set over the microcontroller
interface, multiplied by a gain factor likewise set over the microcontroller interface, and then added to the
direct sound components. The following 8 parameters can be controlled using the microcontroller interface.
I
I
I
I
I
I
I
I
L + R component input attenuator
L − R component input attenuator
Delay scaling parameter
L + R component gain parameter
L − R component gain parameter
L + R component reverb gain parameter
L − R component reverb gain parameter
Raw signal impressed gain parameter
Input L
Input R
ATM
ATM
ATP
ATP
g1 g2 g3 g4 g5
g1 g2 g3 g4 g5
Delay
t1 t2 t3 t4 t5 t6
Delay
t1 t2 t3 t4 t5 t6
ATP
ATM
DS
GP
GM
GPR
GMR
GO
SM5953A
: 0 to 255/1 step
: 0 to 255/1 step
: 0 to 14/1 step
: 0 to 1.875/0.125 step
: 0 to 1.875/0.125 step
: 0 to 1.875/0.125 step
: 0 to 1.875/0.125 step
: 0 to 1.875/0.125 step
DS
DS
GMR
GPR
GO
GP
GP
GO
GM
GM
SEIKO NPC CORPORATION —8
Output L
Output R