27220 Parallax Inc, 27220 Datasheet - Page 127
27220
Manufacturer Part Number
27220
Description
BOOK STAMPWORKS
Manufacturer
Parallax Inc
Datasheet
1.27220.pdf
(230 pages)
Specifications of 27220
Accessory Type
Booklet
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Not applicable / Not applicable
For Use With/related Products
StampWorks
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Not applicable / Not applicable
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Behind the Scenes
With a bit of programming creativity, the BASIC Stamp microcontroller is able to
create and mimic some very interesting sound effects, particularly those used in
telephone system. Since most of the sounds we hear on the telephone (other than
voice) are generated with two tones, the BASIC Stamp’s FREQOUT and DTMFOUT
functions can be used to generate the effects.
DTMFOUT is actually a specialized version of FREQOUT that plays two simultaneous
tones that are superimposed on each other. The purpose of DTMFOUT is to create
the dual-tones required to dial a telephone. The figure below shows the raw and
filtered output of DTMFOUT. In the filtered output the interaction of the two tones is
clearly visible.
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