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l Analysis of speech segments. A) Variation of sound pressure level over time for a representative utterance from the TIMIT corpus (the sentence in this example is "She had your dark suit in greasy wash water all year"). B) Blowup of a 0.1 second segment extracted from the utterance (in this example the vowel sound in "dark"). C) The spectrum of the extracted segment in (B), generated by application of a fast Fourier transform.
Signal T PWM Modulation
Carrier “sidebands” representing baseband signal Baseband signal spectrum
LM393N Full Schematics for Modulator
LM393N Partial Schematics
LM393N Partial Schematics
flat emitter Iphoto IR signal