# audiobook CD

> audiobook on digital optical discs

**Wikidata**: [Q136785446](https://www.wikidata.org/wiki/Q136785446)  
**Source**: https://4ort.xyz/entity/audiobook-cd

## Summary
Audiobook CD is a physical distribution format for audiobooks stored on digital optical discs, specifically compact discs. It is a subclass of the compact disc format, which was invented in 1979, enabling high-fidelity audio playback of literary content.

## Key Facts
- An audiobook CD contains audiobook content on compact discs, a digital optical disc data storage format.
- It is classified as an audiobook distribution format, product distribution method, digital media format, and audio release format.
- The parent format, compact disc, was invented in 1979.
- Audiobook CDs are also known as "audiobook compact discs".
- Standard compact discs can typically store 74-80 minutes of uncompressed audio content.
- The format requires physical CD players or devices with optical disc drives for playback.
- It emerged after the 1979 invention of compact discs but predates digital download formats.

## FAQs
### Q: What is an audiobook CD?
A: An audiobook CD is a compact disc containing digitally stored audio versions of books, allowing users to listen to narrated content via CD players or compatible devices.

### Q: How long do audiobook CDs typically last?
A: Standard compact discs used for audiobooks generally hold 74-80 minutes of audio, with multi-disc sets for longer works.

### Q: What devices play audiobook CDs?
A: Audiobook CDs are playable on any device supporting compact discs, including CD players, car stereos, computers with optical drives, and some portable CD players.

### Q: When did audiobook CDs become available?
A: They became commercially feasible following the 1979 invention of compact discs, though exact adoption timelines aren't specified.

## Why It Matters
Audiobook CDs revolutionized audio literature distribution by leveraging compact disc technology's superior audio quality and durability compared to cassettes. This format made books accessible to visually impaired users during travel or home routines, driving the growth of the audiobook market. Its physical nature also enabled library lending programs and pre-owned sales networks, establishing a bridge between traditional publishing and modern digital accessibility while maintaining tangible product appeal for consumers hesitant about downloads.

## Notable For
- Being one of the first audiobook formats to utilize digital optical disc technology for superior audio fidelity.
- Enabling long-form content storage via multi-disc sets for novels exceeding 80 minutes.
- Providing a stable, skip-resistant alternative to cassette tapes for commuters and travelers.
- Establishing physical audiobook distribution channels before digital downloads dominated.

## Body
### Format Definition
Audiobook CD is a subclass of compact discs designed specifically for distributing audiobooks as digital optical media. It inherits the compact disc's data storage characteristics while adapting them for audio content playback.

### Technical Specifications
- **Storage Capacity**: Standard CDs hold 74-80 minutes of uncompressed audio (CD-DA format: 16-bit, 44.1 kHz sampling).
- **Physical Structure**: Identical to commercial music CDs, measuring 120mm diameter with polycarbonate substrate and reflective aluminum layer.
- **Audio Encoding**: Typically uses PCM (Pulse Code Modulation) for unaltered digital audio quality.

### Distribution Model
Audiobook CDs are distributed as multi-disc physical packages in jewel cases or book-style packaging. Publishers often split lengthy works across multiple discs, with chapter navigation cues embedded in the audio track data.

### Historical Context
Emerging post-1979 compact disc invention, this format dominated audiobook sales during the 1990s-2000s before digital downloads gained traction. It filled the accessibility gap between cassette tapes and MP3-based audiobooks.

### Compatibility
Requires optical disc drives for playback. While CD players universally support the format, modern access increasingly demands digital conversion via ripping software or dedicated audiobook players.