Restoring an Old Tape

The goal is listenable, not indistinguishable from a new recording

Hiss, wow and dropouts on an old tape are physical facts, not software bugs. The harder you clean, the more of the original you lose, so the skill here is knowing where to stop.

What you are delivering

A listenable, archivable digital file, usually alongside the raw capture. Not "restored to sound new", but turning the unlistenable parts into listenable ones while keeping the voice intact.

Three steps

1. Digitise at 48 kHz / 24-bit with no noise reduction during capture, and keep the untouched version. 2. Sort the problems into three kinds — hiss, hum, clicks and dropouts — and treat each with its own tool instead of one long chain. 3. A/B section by section; leave a little noise rather than giving the voice an underwater or pumping quality.

Pages and tools to use

• Audio restoration — what noise reduction, hum removal and click repair each cost; read this before touching anything.
• Noise and hum — hiss comes from the circuit, hum from grounding; you cannot fix what you cannot name.
• Fixing artefacts — decide whether it is an artefact or a performance choice before repairing.
• Audio file formats — what to archive in, and when to make a lossy copy.
• Recording history — tape never had modern bandwidth; do not judge it by digital standards.

Acceptance checks

• The before/after A/B is clearly audible, yet the voice is not plasticky and shows no pumping or metallic edge.
• Noise floor drops by at least 10 dB with no section-to-section breathing.
• Deliver 48 kHz / 24-bit WAV and keep the unprocessed capture alongside it.

Sources

• 本页为场景导航，链接目标为已发布条目（2026-10-31 核对）

Used for fact-checking only; all prose is original.