# Dolby Pro Logic

> surround sound processing technology developed by Dolby Labs

**Wikidata**: [Q1235354](https://www.wikidata.org/wiki/Q1235354)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Dolby_Pro_Logic)  
**Source**: https://4ort.xyz/entity/dolby-pro-logic

## Summary
Dolby Pro Logic is a surround sound processing technology developed by Dolby Labs. Classified as a sound format and a subclass of multi-channel sound systems, it functions primarily as an analog surround decoding method used to create immersive audio environments. It is part of the broader ecosystem of audio technologies designed to distribute sound spatially around the listener.

## Key Facts
- **Definition:** Surround sound processing technology developed by Dolby Labs.
- **Classification:** Instance of "sound format"; subclass of "multi-channel sound system."
- **Function:** Identified specifically as an "analog surround decoding method" within the hierarchy of multi-channel audio technologies.
- **Developer:** Dolby.
- **Variants:** Includes **Dolby Pro Logic II**, **Dolby Pro Logic IIx**, and **Dolby Surround Prologic**.
- **Aliases:** Known alternatively as "Pro logic" and "杜比定向逻辑" (Chinese).
- **Identifiers:**
    - Freebase ID: `/m/027wnk` (referenced publication date: 2013-10-28).
    - Microsoft Academic ID: `97742543`.
    - IPTC Newscode: `audiocodec/c006`.
- **Digital Presence:**
    - Wikipedia entries available in 15 languages: ca, cs, de, en, es, fi, it, ko, nl, pl, pt, ru, tr, uk, vi.
    - Sitelink count: 15.
- **Visual Assets:** Associated logo files include `Dolby-Surround-Pro-Logic_logo-pt.png` and `Dolby_Pro_Logic_II.svg`.

## FAQs
### Q: What type of audio system is Dolby Pro Logic?
A: Dolby Pro Logic is a subclass of a multi-channel sound system, which is an audio setup designed to reproduce sound using more than two discrete audio channels to create an immersive environment.

### Q: How does Dolby Pro Logic relate to other Dolby technologies?
A: It is categorized as a distinct sound format within the Dolby ecosystem, specifically functioning as an analog surround decoding method, whereas other related technologies like Dolby Digital or Dolby Atmos are digital or object-based formats.

### Q: What are the different versions of Dolby Pro Logic?
A: The technology has evolved to include specific versions such as Dolby Pro Logic II, Dolby Pro Logic IIx, and the standard Dolby Surround Prologic.

### Q: Is Dolby Pro Logic considered a legacy technology?
A: Yes, within the context of multi-channel sound systems, Dolby Pro Logic is listed among legacy technologies that paved the way for modern cutting-edge formats like Dolby Atmos and DTS:X.

## Why It Matters
Dolby Pro Logic holds significance as a foundational "legacy" technology in the evolution of home theater and cinematic audio. As a subclass of multi-channel sound systems, it represents a critical step in the transition from standard stereo to immersive surround sound. By functioning as an analog surround decoding method, it allowed early multi-channel setups to extract spatial audio information, enabling sound to be distributed across multiple speakers rather than just two.

This capability revolutionized the listener's experience by introducing spatial depth and directionality, simulating real-world acoustics in home environments. While modern systems have moved toward digital and object-based audio (such as Dolby Atmos), Dolby Pro Logic remains a notable part of audio history for bringing the cinema-style surround experience into broader consumer use.

## Notable For
- **Analog Decoding:** Distinguished as a specific **analog surround decoding method** within a field now dominated by digital codecs.
- **Multi-Channel Foundation:** Serving as a subclass for **multi-channel sound systems**, which support configurations ranging from 5.1 to 7.1 and beyond.
- **Global Recognition:** Having a distinct presence across 15 Wikipedia language editions and recognized by specific IPTC and Freebase identifiers.
- **Legacy Status:** Being cited as a key "legacy" technology alongside **Dolby Digital** and **DTS** that established the standards for spatial audio realism.
- **Naming Variants:** Hosting a family of technologies including **Pro Logic II** and **IIx**, extending the original technology's utility.

## Body

### Definition and Classification
Dolby Pro Logic is a sound format and surround sound processing technology developed by **Dolby**. It is structurally classified as a **subclass of multi-channel sound system**. In the taxonomy of audio formats, it sits alongside other major technologies such as **Dolby Digital**, **DTS**, **Dolby Atmos**, and **Sony Dynamic Digital Sound**.

While multi-channel sound systems generally refer to setups using more than two discrete audio channels (such as 5.1 or 7.1 configurations), Dolby Pro Logic is specifically identified as an **analog surround decoding method**. This distinguishes it from purely digital formats that process discrete audio streams.

### Technical Context and Ecosystem
As part of the multi-channel sound system family, Dolby Pro Logic contributes to the goal of creating immersive audio environments. These systems are widely utilized in:
- **Cinema sound systems**
- **Home theater setups**
- **Music production and mixing**
- **Gaming and VR environments**

The technology enables the distribution of sound across speaker arrays positioned at various angles relative to the listener. Although modern systems like **Dolby Atmos** utilize object-based audio for 3D sound with overhead channels, legacy technologies like Dolby Pro Logic were essential in establishing the front-center-surround configurations (e.g., 5.1) that preceded them.

### Variants and Nomenclature
The technology is known by several names and has spawned updated versions to extend its capabilities. Key aliases and variants include:
- **Dolby Pro Logic II**
- **Dolby Pro Logic IIx**
- **Dolby Surround Prologic**
- **Pro logic**
- **杜比定向逻辑** (Chinese alias)

### Identifiers and Digital Footprint
Dolby Pro Logic is indexed and recognized through various technical and academic identifiers:
- **Wikidata & Wikipedia:** It has a Wikipedia sitelink count of **15** across languages including English, German (de), Spanish (es), Russian (ru), and others.
- **Freebase ID:** `/m/027wnk` (referenced from publication `Q15241312` dated 2013-10-28).
- **Microsoft Academic ID:** `97742543` (discontinued service).
- **IPTC Newscode:** `audiocodec/c006`.
- **Visuals:** Associated logo files include `Dolby-Surround-Pro-Logic_logo-pt.png` and `Dolby_Pro_Logic_II.svg`.

## References

1. Freebase Data Dumps. 2013