System for writing and reading digital data interspersed with analog audio frequency data on magnetic recording tape
US4663678A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 18, 1984 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | Jun 18, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A recording system is provided in which digital time code information is recorded interspersed on the same data track as analog audio message signals. The time codes have a unique format which enables their bit rate to be extracted while reading the code, thus enabling use of the system with tape transports having unregulated fast wind speeds. The system is placed in a fast wind mode of operation and time codes are read and compared to a preselected time code in order to locate a desired audio message for playback. The configuration of the system ensures that the playback of each message will commence only at the beginning of a message. In addition, the invention eliminates the need for a separate data track for time codes, thus increasing the signal to noise ratio of the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.