Signal Processing - January 2017 - 45

D/A
Card

Slave
Speaker
Box

Master Speaker Box

Distribution Box
Connection Board

Original Amplifier Board (Details Omitted)

2 ch

+
-

+
A1
-

A1

GND
A/D
Card

Collection Board
R3
A2

2 ch

R2
-

A2

+
R2

R3

A2

C

+

Detection
Board

R3

-

+
-

C

R3

R3

R1
R3

A3

C
+

0V

R 1 R1

+

R3

-

R3
A3

Similarily to Above

5V
+
A3
-

R3

R1
R3

-

+

-

A3
+

GND
Digital
Out

Relay Control Board (Details Omitted)

Figure S2. A schematic of the hardware, illustrating the circuitry for one speaker pair. A1 is the original power amplifier for one speaker. A2 is 1⁄4
of a TL074 [S7] quad OP-amp. A3 is 1⁄4 of a MCP6024 [S6] quad low-noise OP-amp. Discrete component values: R1 = 1 kΩ, R2 = 10 kΩ, R3 =
100 kΩ, C = 1 μF.
References

[S1] Contec. Digital to analog output board for PCI, 16ch type-DA1216(PCI), Datasheet, Ver. 2.13 [Online]. Available: http://www2.contec
.co.jp/prod_data/da1216pci/da1216pci_e.pdf

+
-
-

[S2] Contec. (2013, Dec.). Digital to analog output board for PCI, DA1216(PCI)-DA12-8(PCI)-DA12-4(PCI), User's Guide [Online]. Available:
http://www2.contec.co.jp/dl_data/LZJ367/LZJ367_131203.pdf
[S3] Contec. Multi-channel analog input board for PCI-AD12-64(PCI),
Datasheet, Ver. 3.13 [Online]. Available: http://www2.contec.co.jp/
prod_data/ad1264pci/ad1264pci_e.pdf

+
-

Output
Voltage

Input
Voltage
+

Figure S3. A traditional instrumentation amplifier based on three
OP-amps and seven resistors.

experimental setup may use other components, in particular, eliminating the master-slave configuration inherited
from the choice of the Maxxtro loudspeaker pairs, for
which there is no natural need in our application.

set of requirements that the final product should fulfill. These
tasks are usually renegotiated with the project group until a
final set of requirements is agreed upon, a few weeks after
the start of the project. The role of the customer is taken by
a faculty member, and the course director can also assume
this role. The university also provides support to the students

[S4] Contec. (2013, Dec.). 64/16 Channel analog to digital input board for
PCI-AD12-64(PCI)-AD12-16(PCI), User's Guide [Online]. Available: http://
www2.contec.co.jp/dl_data/LZJ371/LZJ371_131202.pdf
[S5] Maxxtro. Maxxtro mini speaker MX-US-08, Datasheet [Online].
Available: http://www.elfa.spb.ru/uploads/tdpdf/kt856563.pdf
[S6] Microchip. (2009). MCP6021/1R/2/3/4, Datasheet [Online].
A v a i l a b l e : h t t p : // w w1. m i c r o c h i p . c o m /d o w n l o a d s /e n /
DeviceDoc/21685d.pdf
[S7] Texas Instruments. (2015, June). TL07xx low-noise JFET-input operational amplifiers, Datasheet [Online]. Available: http://www.ti.com/lit/ds/
symlink/tl074.pdf

in the form of a supervisor (normally a senior Ph.D. student
or teaching assistant) as well as topic expertise (from other
junior faculty members and Ph.D. students). Figure 3 depicts
the various roles and the interactions, with solid lines indicating formal contacts (documents, official meetings) and dashed
lines representing informal contacts (advice, meetings). Since

IEEE Signal Processing Magazine

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January 2017

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45

http://www.www2.contec http://www.co.jp/prod_data/da1216pci/da1216pci_e.pdf http://www2.contec.co.jp/dl_data/LZJ367/LZJ367_131203.pdf http://www2.contec.co.jp/ http://http:// http://www2.contec.co.jp/dl_data/LZJ371/LZJ371_131202.pdf http://www.elfa.spb.ru/uploads/tdpdf/kt856563.pdf http://www.ti.com/lit/ds/

Table of Contents for the Digital Edition of Signal Processing - January 2017