SSM-2005 Analog Devices, SSM-2005 Datasheet - Page 14

• Manufacturer Part Number: SSM-2005
• Description: Search ---> SSM2005
• Manufacturer: Analog Devices

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SSM2005
Using the SSM2005 for Karaoke
In Video mode, the SSM2005 removes centered vocal informa-
tion from the LF and RF speakers. This allows the device to be
used in Karaoke applications, where the user can sing along with
any music recording. Figure 11 shows a circuit diagram for such
an application.
The OP179 is the microphone preamplifier with a gain of +20 dB.
A 2.2 k resistor connects the microphone to the +6 V supply rail,
providing proper biasing for an electret microphone.
The SSM2402 is used as a clickless switch, connecting the
center output to either the center out from the SSM2005 or the
microphone. In Circle Surround mode, the control voltages to
the SSM2402 connect the output from the SSM2005 to the
center output.
In Karaoke Mode, this connection is opened, and the micro-
phone is directed to the center output. At the same time, the
SSM2005 should be loaded with data byte (MSB first):
1 1 1 0 1 0 1 1. This activates the center canceling circuitry in
the SSM2005, removing centered vocal information from the
left front and right front speakers.
The overall result is the microphone output comes out of the
center speaker, with the vocals-removed music coming from the
remaining speakers.
–14–
RIGHT IN
FOR KARAOKE, LOAD DATA
BYTE: 1 1 1 0 1 0 1 1
LEFT IN
SURROUND
Figure 11. Using the SSM2005 for Karaoke
KARAOKE
10 F
10 F
CIRCLE
MODE
MODE
10
39
7
SSM2005*
2.2k
+5V
MIC
SW-2
+6V
48
47
46
45
44
0.1 F 1k
*ADDITIONAL PINS OMITTED
FOR CLARITY
6V
1
2
3
4
5
6
7
SSM2402
10k
+6V
14
13
12
11
10
6V
9
8
OP179
+6V
7404
OUTPUTS
CENTER
L
R
L
R
F
S
F
S
REV. 0