1Lecture 2 – Discrete-Time Fourier SeriesECSE304 Signals and Systems IIECSE 304 Signals and Systems IILecture 2: Discrete-Time Fourier SeriesReading: O and W, Secs. 3.6 and 3.7Richard RoseMcGill University Dept. of Electrical and Computer Engineering2Lecture 2 – Discrete-Time Fourier SeriesECSE304 Signals and Systems IIImpact of Digital Signal Processing on Advances in Speech Synthesis•It became common place for research on speech, audio, and images to be performed with discrete time algorithms on digital computers in the 1960s•Before that time, implementing these systems was done in hardware using analog components•Constructing systems could take years and was dominated by the effort required to build the hardware•It was researchers in the areas of speech, audio, imaging, and communications that led the effort to use computers to process signals[Millman, 1984]
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3Lecture 2 – Discrete-Time Fourier SeriesECSE304 Signals and Systems IIThe First Electronic Speech Synthesizer•Homer Dudley’s “Voder” Speech Synthesizer from Bell LaboratoriesVoder Operator at the Voder ConsoleSchematic Diagram of Operator’s Console[Millman, 1984][Millman, 1984]4Lecture 2 – Discrete-Time Fourier SeriesECSE304 Signals and Systems IIAnalog Filters and Oscillators under Digital Control•Gunar Fant’sOrator Verbis Electris OVE-II cascade formant Speech Synthesizer from KTH in SwedenA 1962 photograph of the racks of analog filters and oscillators