Miniature computer

A reproducing circuit for reproducing digital information recorded in a cassette tape by a frequency modulation in which different first and second digital logic levels are respectively represented by first and second repeated signals having respective first and second repeated frequencies, said first repeated frequency being higher than said second repeated frequency, said reproducing circuit comprising:

• pulse forming circuit means for producing a first pulse signal having said first repeated frequency in response to said first repeated signal recorded in the cassette tape, or producing second pulse signal having said second repeated frequency in response to said second repeated signal recorded in the cassette tape;
• one-shot circuit means for producing at its output terminal one pulse having a predetermined pulse width in response to a trigger signal impressed at its input terminal;
• flip-flop circuit means for receiving and holding a digital signal impressed at its data input terminal in response to a control pulse impressed at its control input terminal, said flip-flop circuit means having its output terminal for delivering the digital signal held therein;
• first connecting means for supplying said first or second pulse signal of the pulse forming circuit means produced in response to the digital information recorded in said cassette tape to said input terminal of the one-shot circuit means as said trigger signal;
• second connecting means for supplying the pulse signals produced at said output terminal of the one-shot circuit means in response to said first or second pulse signal to said data input terminal of the flip-flop circuit means;
• and
• third connecting means for supplying said first or second pulse signal of the pulse forming circuit means produced in response to the digital information recorded in said cassette tape to said control input terminal of the flip-flop circuit means as said control signal, whereby reproduced digital information corresponding to said digital information recorded in the cassette tape is derived from said output terminal of the flip-flop circuit means.