Abstract: An electronic card reading device for reading the data stored in an electronic card by electrically bringing the electronic card into contact with the reading device and for displaying the data that is read on a display thereof comprising; a main unit in the form of a thin plate having card contacts which are electrically brought into contact with an electronic card, an integrated circuit, and a display on which to display the data which is read from the electronic card, a power source in the form of a thin plate which is electrically connected to the main unit to supply power thereto, the power source being constructed so as to be separate from the main unit, and a soft cover having a housing portion for the main unit and another housing portion for the power source, in which the main unit and the power source are separately housed, and having an electronic card pocket which is so disposed that an electronic card can be inserted therein and the electronic card thus inserted is brought into contact with the c

Abstract: A waveform synthesizer arrangement for use in an audible output device is adapted to synthesize desired waveforms and includes a digital filter to reduce the generation of output noise. A time sequential process is effected on data to be reproduced which considers the total nature of waveforms of interest thus performing proper waveform adjustment to avoid acute changes in the waveforms. The time sequential process is affected by previous data and has the effect on the frequency construction of the resulting waveform.