Toy helmet for scrambled communications

Details Toy helmet for scrambled communications Toy helmet for scrambled communications

1990-02-21

1990-08-14

Tarcza, Thomas H.

Cryptography

Cryptanalysis

380 38, 380 39, 380 40, H04K 102

Patent

active

049493787

ABSTRACT:
A toy helmet that permits the wearer to speak as to generate unintelligible noise so far as bystanders are concerned but which can be understood by another child wearing an identical helmet. Each helmet is equipped with internal and external microphones and an external speaker and internal earphones. Scrambler/descrambler circuitry is selectively connectable by means of a push-to-talk switch that delivers speech from the internal microphone to the external loudspeaker of the first helmet. The external microphone and the corresponding scambler/descrambler circuitry and push-to-talk switch of the second helmet delivers unscrambled speech to its internal earphone to permit the two helmet wearers to communicate intelligibly with one another. The scrambler/descrambler circuitry samples the low-pass filtered signals applied to its microphones at a sampling rate equal to the cut-off frequency of the low-pass filter.

REFERENCES:
patent: 3114800 (1963-12-01), Simpkins
patent: 4152553 (1979-05-01), White
patent: 4195202 (1980-03-01), McCalmont
patent: 4400591 (1983-08-01), Jennings et al.
patent: 4652699 (1987-03-01), Akaiwa
patent: 4683586 (1987-07-01), Sakamoto et al.
patent: 4790009 (1988-12-01), Ishigaki et al.

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