Recording and reproducing apparatus

Claim 2

Magnetic tape reproducing apparatus, comprising: a. a playback head for reproducing signals previously recorded on a track of magnetic tape, the resultant output signals from said playback head being derivatives and distortions of said previously recorded signals, b. decoding means for restoring said output signals to the waveshape of said previously recorded signals, said decoding means comprising an input and output terminal; an operational amplifier with inverting and noninverting inputs having its output coupled to said output terminal, a capacitor coupled from said inverting input to ground, the non-inverting input coupled to said input terminal; and a paralleled set of diodes in opposite polarity relationship coupled between said input terminal and said inverting input of said operational amplifier; anD c. display means for displaying signals which are a function of the output signals from said decoding means.

Claim 3

Magnetic tape recording apparatus, comprising: a. means for converting information into an electrical signal representative of said information, b. encoding means for modulating said electrical signal to produce a plurality of output pluses representative of the amplitude of said electrical signal, said encoding means comprising an input terminal and an output terminal, an operational amplifier having inverting and non-inverting inputs thereof, said inverting input being connected with said input terminal, the output of said operational amplifier being connected to said output terminal, a pair of feedback resistors respectively coupled from the output of the operational amplifier to the inverting and non-inverting inputs of the operational amplifier, and a capacitor coupled from said inverting input to ground, and c. means for recording said output pulses on magnetic tape.

Claim 4

Magnetic tape recording apparatus, comprising: a. means for converting information into an electrical signal representative of said information, b. encoding means for modulating said electrical signal to produce a plurality of output pluses representative of the amplitude of said electrical signal, said encoding means comprising an input terminal and an output terminal, an operational amplifier having inverting and non-inverting inputs thereof, said inverting input being connected with said input terminal, the output of said operational amplifier being connected to said output terminal, a pair of feedback resistors respectively coupled from the output of the operational amplifier to the inverting and non-inverting inputs of the operational amplifier, and a capacitor coupled from said inverting input to ground, and c. means for recording said output pulses on magnetic tape.

Claim 5

Apparatus for recording onto magnetic recording medium, signals representative of cyclically varying electrical signals received by said apparatus, comprising: a. encoder means for producing a series of positive and negative square wave pulses, including control means for determining the relative width of said positive and negative square wave pulses, said encoder means comprising an operational amplifier having a pair of feedback resistors respectively coupled from its output to the inverting and non-inverting input terminals of said amplifier, said control means including a capacitor coupled from said inverting terminal to ground, and means coupling said cyclically varying electrical signals to said inverting input terminal, and b. means coupled to the output of said encoder for recording onto magnetic recording medium signals representative of said square wave pulses.

Claim 6

Apparatus for recording onto magnetic recording medium, signals representative of cyclically varying electrical signals received by said apparatus, comprising: a. encoder means for producing a series of positive and negative square wave pulses, including control means for determining the relative width of said positive and negative square wave pulses, said encoder means comprising an operational amplifier having a pair of feedback resistors respectively coupled from its output to the inverting and non-inverting input terminals of said amplifier, said control means including a capacitor coupled from said inverting terminal to ground, and means coupling said cyclically varying electrical signals to said inverting input terminal, and b. means coupled to the output of said encoder for recording onto magnetic recording medium signals representative of said square wave pulses.

Claim 7

In a magnetic recording apparatus of the type comprising first means for producing amplitude varying electrical signals representative of information being monitored and second means for recording onto magnetic recording medium signals representative of said amplitude varying electrical signals, the improvement comprising encoder means between said first and second means for converting said amplitude varying electrical signals into pulses which are a function of the said amplitude, said encoder comprising pulse generating means having a pair of input terminals and an output terminal, said output terminal being coupled to said second means, pulses being generated at the output terminal in response to the voltage difference across said input terminals passing through zero, said pulse generating means being an operational amplifier, the input terminals of which are provided by the inverting and non-inverting terminals thereof, and third means comprising a capacitor having one end coupled to the inverting terminal and the other end coupled to ground, the charging time of said capacitor being determined by the sign of the amplitude varying electrical signals, the amplitude varying electrical signals also being coupled to said inverting terminal, and a pair of feedback resistors respectively coupled from the output terminal of said operational amplifier to the inverting and non-inverting terminals thereof.

Claim 8

In a magnetic recording apparatus of the type comprising first means for producing amplitude varying electrical signals representative of information being monitored and second means for recording onto magnetic recording medium signals representative of said amplitude varying electrical signals, the improvement comprising encoder means between said first and second means for converting said amplitude varying electrical signals into pulses which are a function of the said amplitude, said encoder comprising pulse generating means having a pair of input terminals and an output terminal, said output terminal being coupled to said second means, pulses being generated at the output terminal in response to the voltage difference across said input terminals passing through zero, said pulse generating means being an operational amplifier, the input terminals of which are provided by the inverting and non-inverting terminals thereof, and third means comprising a capacitor having one end coupled to the inverting terminal and the other end coupled to ground, the charging time of said capacitor being determined by the sign of the amplitude varying electrical signals, the amplitude varying electrical signals also being coupled to said inverting terminal, and a pair of feedback resistors respectively coupled from the output terminal of said operational amplifier to the inverting and non-inverting terminals thereof.

Claim 9

Reproducing apparatus, comprising: a. playback means for reproducing signals previously recorded onto magnetic recording medium, thereby to produce amplitude varying electrical signals from said playback means which are functions of said previously recorded signals, b. decoding means for producing output pulses responsive to the maximum and minimum peaks of said amplitude varying electrical signals, said decoding means comprising an operational amplifier having inverting and non-inverting input terminals and an output terminal, pulses being produced at said output terminal solely in response to when the magnitude of the voltage at one of said input terminals exceeds the magnitude of the voltage at the other of the said input terminals, and means coupled to said pair of input terminals for producing said excess voltage conditions across said input terminals in response to the maximum and minimum peaks of said amplitude varying electrical signals, and feedback resistor means coupled from the output of the operational amplifier to the said non-inverting terminal, and c. means coupling said output terminal to display means for displaying said reproduced signals.

Claim 10

Reproducing apparatus, comprising: a. playback means for reproducing signals previously recorded onto magnetic recording medium, thereby to produce amplitude varying electrical signals from said playback means which are functions of said previously recorded signals, b. decoding means for producing output pulses responsive to the maximum and minimum peaks of said amplitude varying electrical signals, said decoding means comprising an operational amplifier having inverting and non-inverting input terminals and an output terminal, pulses being produced at said output terminal solely in response to when the magnitude of the voltage at one of said input terminals exceeds the magnitude of the voltage at the other of the said input terminals, and means coupled to said pair of input terminals for producing said excess voltage conditions across said input terminals in response to the maximum and minimum peaks of said amplitude varying electrical signals, and feedback resistor means coupled from the output of the operational amplifier to the said non-inverting terminal, and c. means coupling said output terminal to display means for displaying said reproduced signals.