# Compact Disc Digital Audio

> audio data format used on the compact disc

**Wikidata**: [Q1121020](https://www.wikidata.org/wiki/Q1121020)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Compact_Disc_Digital_Audio)  
**Source**: https://4ort.xyz/entity/compact-disc-digital-audio

## Summary
Compact Disc Digital Audio (CDDA) is a technical standard and data format used for storing audio on compact discs. Developed and owned by the Sony Group, the format was introduced in 1982 to provide digital optical storage for sound recordings. It is also widely referred to as Audio CD or Red Book.

## Key Facts
- **Inception**: The format was introduced in **1982**.
- **Owner**: It is **owned by the Sony Group**.
- **Classification**: It is an instance of a **data format** and **technical standard**, classified as a subclass of **compact disc** and **opto-digital audio storage medium**.
- **Data Speed**: The format utilizes a data transfer speed of **1,411,200 bits per second**.
- **Aliases**: Common aliases include **Audio-CD**, **Red Book**, **CD-DA**, **CD-Audio**, and **CDDA**.
- **Parent Format**: It is part of the **compact disc** digital optical disc data storage format family, which originated in 1979.
- **Identifiers**: The GND ID is **4346365-4** and the Freebase ID is **/m/0bjg9**.
- **Variants**: Related formats include **CD-Text** (an extension of the standard), **SHM-CD** (improved material), **Blu-spec CD**, and **CD Video** (introduced in 1987).

## FAQs
### Q: When was Compact Disc Digital Audio introduced?
A: The format was introduced in 1982.

### Q: Who owns the Compact Disc Digital Audio format?
A: The format is owned by the Sony Group.

### Q: What is the technical data transfer speed for CDDA?
A: The specified data transfer speed for the format is 1,411,200 bits per second.

### Q: What is the "Red Book" in relation to audio CDs?
A: "Red Book" is a common alias for Compact Disc Digital Audio, referring to the standard specifications for the format.

## Why It Matters
Compact Disc Digital Audio matters as the foundational technical standard that enabled the commercial success of the compact disc for music consumption. By defining how audio data is stored on optical media, it established a uniform framework for hardware manufacturers and record labels, ensuring that any audio CD would play on any standard CD player. As a subclass of opto-digital audio storage mediums, it represented a shift from analog to digital playback, offering a specific, consistent data transfer rate of 1,411,200 bits per second.

Owned by the Sony Group and launched in 1982, it became the primary vessel for digital audio distribution for decades. Its structure allowed for the development of extensions such as CD-Text and variants like SHM-CD and Blu-spec CD, demonstrating the format's adaptability and enduring technical relevance in the history of data storage and audio engineering.

## Notable For
- **Standardization**: Being the primary technical standard ("Red Book") for audio implementation on compact discs.
- **Specific Data Rate**: Maintaining a fixed data transfer speed of 1,411,200 bits per second for audio playback.
- **Corporate Ownership**: Being a major digital format owned specifically by the Sony Group.
- **Lineage**: Serving as the specific audio implementation of the broader compact disc digital optical storage format invented in 1979.
- **Extended Ecosystem**: Serving as the base for later technologies like CD Video (1987) and enhanced material variants like SHM-CD.

## Body

### Definition and Classification
Compact Disc Digital Audio (CDDA) is defined as an audio data format used on the compact disc. Structurally, it is an instance of a **data format** and a **technical standard**. It falls under the subclass of **compact disc** and is categorized as an **opto-digital audio storage medium**.

### History and Ownership
The format traces its lineage to the inception of the compact disc in **1979**. The specific Compact Disc Digital Audio standard was realized in **1982**. The intellectual property and standards are **owned by the Sony Group**.

### Technical Specifications
The format operates using a specific **data transfer speed** of **1,411,200 bits per second** (net/gross). It utilizes the **Compact Disc Audio track** structure. The standard addressing mode uses 75 logical blocks per unit (where the unit duration is 1 second).

### Related Formats and Extensions
CDDA serves as the parent or related class for several other technologies:
- **CD-Text**: An extension of the Red Book specifications.
- **SHM-CD**: A variant made of improved material.
- **Blu-spec CD**: A specific CD format.
- **CD Video**: A format introduced in 1987 combining compact disc and LaserDisc technologies.

### Identifiers and Aliases
The format is recognized by several identifiers and titles:
- **GND ID**: 4346365-4
- **Freebase ID**: /m/0bjg9
- **Commons Category**: Compact Disc Digital Audio
- **Aliases**: Audio-CD, audio CD, CDDA, CD-DA, CD-Audio, Red Book, CD-A, CD de audio, CD A, CD DA.

## Schema Markup
```json
{
  "@context": "https://schema.org",
  "@type": "Thing",
  "name": "Compact Disc Digital Audio",
  "description": "Audio data format used on the compact disc, introduced in 1982 and owned by the Sony Group.",
  "sameAs": [
    "https://en.wikipedia.org/wiki/Compact_Disc_Digital_Audio"
  ],
  "additionalType": [
    "Data format",
    "Technical standard"
  ]
}

## References

1. Freebase Data Dumps. 2013