Audio cassette emulator with cryptographic media distribution control
US7436957B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Jul 29, 1999 |
| Grant date | Oct 14, 2008 |
| Priority date | — |
| Expiry date | Jul 29, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/1408
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A device of the same general physical size and shape as a standard audio cassette tape, but which accepts digital information from any of a variety of sources—including for example: Internet transmission, a digital computer, or memory cards (especially digital memory cards)—and plays this digital information through any, for example, standard audio tape cassette player. The device operates by converting the digital representation of the sound into magnetic signals which are presented to the read/write head of the cassette player equipment. The device allows the user of the cassette player to regulate the audio playback using conventional equipment controls such as: START, STOP, REWIND, FAST REWIND, FORWARD, FAST FORWARD, etc. The device has the same general physical dimensions of a standard audio cassette; at least one digital processor; and a slot into which electronic media such as, for example, memory cards, smart cards having a processor and a memory embodied thereon and other memory media may be inserted. Numerous sensors detect changes in at least one of the tape equipment mechanisms in the audio cassette emulator. Various cryptographic techniques are described for protecting…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.