Page 183 - Robots Androids and Animatrons : 12 Incredible Projects You Can Build

3. Exertion. Physical stress is another factor. If you are
programming exercise equipment (a Stairmaster or stationary
bike) to respond to voice, you might want to record people
who are a little out of breath.
4. Background noise. Background noise is always a problem.
As stated previously, a steady background noise (air
conditioner) has less impact on speech recognition accuracy
than a nonsteady background noise (TV).
Speech-controlled robotic arm
In Chap. 15, another derivative of the speech-recognition interface
is used to control a robotic arm.

Parts list for speech-recognition circuit
(1) IC1 HM2007 IC
(1) IC2 SRAM 8K X 8
(1) IC3 74LS373
(2) IC4 and IC5 7448
(1) XTAL 3.57 MHz
162
(1) Speech-recognition PCB
(1) 12-contact keypad
(2) 7-segment displays
1
(2) 16-pin, 220-ohm, 4-W resistor packs
1
(1) 22K-ohm, 4-W resistor
1
(1) 5.6K-ohm, 4-W resistor
(1) 0.0047- F cap
(1) C2 100- F, 16V cap
(1) C5 0.1- F cap
(1) 7805 voltage regulator
(1) Microphone
(1) 9V battery clip
Complete speech-recognition kit—$100.00

Parts list for interface circuit

(2) 4011 Quad 2 input NAND
(1) 74LS373 Octal D flip-flop tri-state
(1) 4028 BCD-to-decimal decoder
Team LRN
Chapter seven