ELECTRONIC ARITHMETIC LEARNING AID

摘要

An electronic handheld arithmetic learning aid which includes a speech synthesis device. The speech synthesis device 10 includes a digital filter, excitation circuitry 24, interpolation circuitry 23, a parameter decoder, a digital-to-analog converter 25 and associated timing circuits. A non-volatile memory 202 stores digital data representative of random arithmetic problems, the solutions to these problems and coded filter coefficients sufficient to cause the speech synthesis integrated circuit to audibly pronounce a preselected list of words. Various modes of operation are utilized to enhance both arithmetic skills and the ability to perceive arithmetic problems couched in words and phrases.