Random accessible signal filing system

A random access digital singal recording and reproducing system comprising:

• a sampling pulse signal generator for generating a sampling pulse signal;
• a modulator coupled to said sampling pulse generator for receiving externally produced analog signals and converting said analog signals into digital signals in accordance with said sampling pulse signal;
• a demodulator coupled to said sampling pulse generator for receiving digital signals and converting said digital signals into analog signals in accordance with said sampling pulse signal;
• a magnetic disc unit for recording, storing and reproducing digital signals;
• a magnetic disc control means coupled to said magnetic disc unit and comprising a write signal generator for producing a write signal and a read signal generator for producing a read signal, said magnetic disc control means causing said magnetic disc unit to record said digital signals at a rate corresponding to the rate of said write signal and to reproduce said digital signals at a rate corresponding to the rate of said read signal;
• at least two buffer memory means, comprising random access memories having a plurality of memory locations and a rate control input, for recording digital signals and for reproducing digital signals at a rate corresponding to the rate of the signal applied to said rate control input;
• a buffer control means coupled to said sampling pulse signal generator, said modulator, said demodulator, said magnetic disc control means and said at least two buffer memory means, said buffer control means operating in two manually selectable modes, wherein when said first mode is selected, said buffer control means couples said modulator to one of said at least two buffer memory means and couples said sampling pulse signal generator to said rate control input of said one of said at least one buffer memory means for recording said digital signals produced by said modulator in successive memory locations of said one of said at least two buffer memory means at a rate corresponding to the rate of said sampling pulse signal until said one of said at least two buffer memory means has recorded digital signals at each of its plurality of memory locations whereupon said buffer control means couples said modulator to a second of said at least two buffer memory means and said buffer control means couples said sampling pulse generator to said rate control input of said second of said at least two buffer memory means for storing said digital signals produced by said modulator in successive memory locations of said second of said at least two buffer memory means at a rate corresponding to the rate of said sample pulse signal, said buffer control means couples said magnetic disc control means to said one of said at least two memory means and said buffer control means couples said write signal generator to said rate control input of said one of said at least two buffer memory means for reproducing digital signals stored in successive memory locations of said one of said at least buffer memory means at a rate corresponding to the rate of said write signal and for recording said digital signals in said magnetic disc unit until said one of said at least two buffer memory means has reproduced said digital signals stored in each of its plurality of memory locations whereupon said buffer control means couples said magnetic disc control unit to a second of said at least two memory means and said buffer control means couples said write signal generator to said rate control input of said second of said at least two buffer memory means for reproducing said digital signals stored in successive memory locations of said second of said at least two buffer memory means at a rate corresponding to the rate of said write control signal and for recording said digital signals in said magnetic disc unit, whereby each of said at least two buffer memory means in turn records digital signals produced by said modulator and reproduces said recorded digital signals for recording in said magnetic disc unit;
• and wherein when said second mode is selected, said buffer control means couples said magnetic disc control unit to one of said at least two of said buffer memory means and said buffer control means couples said read signal generator to said rate control input of said one of said at least two of said memory means for recording digital signals reproduced by said magnetic disc unit in successive memory locations of said one of said at least two of said buffer memory means at a rate corresponding to the rate of said read signal until said one of said at least two of said buffer memory means has recorded digital signals at each of its plurality of memory locations whereupon said buffer control means couples said magnetic disc control unit to a second of said at least two buffer memory means and said buffer control means couples said read signal generator to said rate control input of said second of said at least two buffer memory means for recording digital signals reproduced by said magnetic disc unit in successive memory locations of said second of said at least two buffer memory means at a rate corresponding to the rate of said read signal and said buffer control means couples said demodulator to said one of said at least two buffer memory means and said buffer control means couples said sampling pulse signal to said rate control input of said one of said at least two buffer memory means for reproducing digital signals stored in successive memory locations of said one of said at least two buffer memory means at a rate corresponding to the rate of said sampling pulse signal and for applying said reproduced digital signals to said demodulator until said one of said at least two buffer memory means has reproduced said digital signals stored in each of its plurality of memory locations whereupon said buffer control means couples said demodulator to said second of said at least two buffer memory means and said buffer control means couples said sampling pulse signal to said rate control input of said second of said at least two buffer memory means for reproducing said digital signals stored in successive memory locations of said second of said at least two buffer memory means at a rate corresponding to the rate of said sampling pulse signal for applying said reproduced digital signals to said demodulator, whereby each of said at least two buffer memory means in turn records said digital signals reproduced by said magnetic disc unit and reproduces said recorded digital signals for applying said recorded digital signals to said demodulator;
• and a central processing unit for controlling said sampling pulse signal generator, said modulator, said demodulator, said magnetic disc control means, said buffer memory means and said buffer control means, and said central processing unit being connected to said buffer memory for transferring digital signals therebetween wherein digital signals in said central processing unit are recorded by said magnetic disc unit through said at least two buffer memory means and digital signals recorded by said magnetic disc unit are transferred to said central processing unit through said buffer memory means.