Magnetic disc coder-decoder

Claim 2

A magnetic disc coder-decoder comprising a rotatable magnetic disc means, said disc means being adapted to have a code comprising a plurality of tone bursts recorded thereon, means for rotating said disc means, means for taking said tone burst from said disc means and transmitting said code in the form of pulses of radiant energy, means for receiving transponder reply pulses in the form of coded infrared flashes, means for converting said infrared flashes to tone bursts, means for recording said tone bursts on said disc means, a coincidence detector, means for taking said tone bursts from said disc means for applying said tone bursts to said coincidence detector, said coincidence detector providing a single pulse output only when simultaneous application thereto of a predetermined number tone bursts.

Claim 3

The magnetic disc coder-decoder of claim 1 further comprising an indicator means and means connecting said coincidence detector thereto whereby an indication is provided by said single pulse output.

Claim 4

A magnetic disc coder-decoder comprising a rotatable disc having first and second sound tracks adjacent the rim thereof, means for rotating said disc, a first magnetic head positioned adjacent said first sound track, a plurality of second magnetic heads positioned adjacent said second track, said first sound track having a single tone burst recorded thereon, means connecting said first magnetic head to each of said second magnetic heads whereby said single tone burst is simultaneously recorded by each of said second magnetic heads on said second sound track, a third magnetic head positioned adjacent said second sound track and means connecting said third magnetic head to a radio transmitter whereby a series of pulses of radiant energy representing said tone bursts are transmitted.

Claim 5

A magnetic disc coder-decoder comprising a rotatable disc having first and second sound tracks adjacent the rim thereof, means for rotating said disc, a first magnetic head positioned adjacent said first sound track, a plurality of second magnetic heads positioned adjacent said second track, said first sound track having a single tone burst recorded thereon, means connecting said first magnetic head to each of said second magnetic heads whereby said single tone burst is simultaneously recorded by each of said second magnetic heads on said second sound track, a third magnetic head positioned adjacent said second sound track and means connecting said third magnetic head to a radio transmitter whereby a series of pulses of radiant energy representing said tone bursts are transmitted.

Claim 6

The magnetic disc coder-decoder of claim 3 wherein said connecting means comprises a switch means, one position of said switch means connecting said first magnetic head to each of said second magnetic heads and said third head to said radio transmitter, a signal receiver and a coincidence detector, a second position of said switch means connecting said third magnetic head to said radio receiver and said second magnetic heads to said coincidence detector, said coincidence detector providing a single pulse output only upon simultaneous application thereto of a predetermined number tone bursts.

Claim 7

The magnetic disc coder-decoder of claim 4 further comprising an indicator means and means connecting said coincidence detector thereto.

Claim 8

A magnetic disc coder-decoder comprising a constant speed motor, a plurality of coder discs affixed to the shaft of said motor and rotating therewith, each of said coder discs having a sound track adjacent the rim thereof, each of said sound tracks having a tone burst recorded thereon at a different sector thereof, a magnetic head adjacent each of said coder discs, means connecting each of said heads to a radio transmitter whereby pulses of radiant energy representing said sound bursts are transmitted, a decoder disc having a sound track adjacent the rim thereof affixed to said motor shaft and rotating therewith, receiver means for receiving coded infrared flashes and converting said flashes to tone bursts, a recording head, means connecting said recording head to said receiver means whereby said tone bursts are recorded on said decoder disc sound track, a plurality of pickup heads adjacent said decoder disc sound track at sectors corresponding to said different sectors of said coder discs, a coincidence detector and means connecting each of said pickup heads to said coincidence detector, said coincidence detector providing a single pulse output only upon receiving simultaneously a predetermined number of tone bursts from said pickup heads.

Claim 9

A magnetic disc coder-decoder comprising a constant speed motor, a plurality of coder discs affixed to the shaft of said motor and rotating therewith, each of said coder discs having a sound track adjacent the rim thereof, each of said sound tracks having a tone burst recorded thereon at a different sector thereof, a magnetic head adjacent each of said coder discs, means connecting each of said heads to a radio transmitter whereby pulses of radiant energy representing said sound bursts are transmitted, a decoder disc having a sound track adjacent the rim thereof affixed to said motor shaft and rotating therewith, receiver means for receiving coded infrared flashes and converting said flashes to tone bursts, a recording head, means connecting said recording head to said receiver means whereby said tone bursts are recorded on said decoder disc sound track, a plurality of pickup heads adjacent said decoder disc sound track at sectors corresponding to said different sectors of said coder discs, a coincidence detector and means connecting each of said pickup heads to said coincidence detector, said coincidence detector providing a single pulse output only upon receiving simultaneously a predetermined number of tone bursts from said pickup heads.

Claim 10

The magentic disc coder-decoder of claim 6 and further comprising an indicator means and means connecting said coincidence detector thereto whereby an indication is provided by said single pulse output.

Claim 11

The magnetic disc coder-decoder of claim 6 further comprising a reject circuit, an additional pickup head adjacent said decoder disc sound track at a sector different from said sectors corresponding to said different sectors of said coder disc and means connecting said reject circuit to said additional pickup head and to the input of said coincidence detector whereby output from said additional pickup head prevents pulse output from said coincidence detector.