How Ampex Invented Modern Video Recording on Magnetic Tape

This 1955 invention enabled the recording of high-frequency television signals onto magnetic tape, replacing the expensive and low-quality film recording methods of the era.

What it covers

The system uses a rotating head assembly that spins at high speeds perpendicular to the direction of the moving magnetic tape. By scanning the tape transversely, the system achieves the high relative speeds necessary to capture the massive amount of data required for a television signal. This allows for the storage of high-frequency video information on a relatively slow-moving strip of tape. It effectively solved the problem of how to record a signal that required a bandwidth far beyond what stationary heads could handle at the time.

What it doesn't cover

• —Does not cover digital video recording or compression formats.
• —Does not cover helical scan recording, which uses a different tape path geometry.
• —Does not cover optical disc storage or solid-state memory.

The clever bit

By rotating the recording heads across the tape width instead of moving the tape at impossible speeds, the engineers achieved the necessary bandwidth while keeping the physical tape manageable.

Why it matters

This invention, known as the VR-1000, transformed the television industry by allowing for high-quality delayed broadcasts and editing. It ended the era of 'kinescope' recording, where cameras simply filmed a television monitor, which resulted in poor image quality. It became the industry standard for decades.

Real-world examples

• 1.Ampex VR-1000 broadcast video tape recorder
• 2.Early television studio master recording equipment