# Video High Density

> videodisk format

**Wikidata**: [Q252361](https://www.wikidata.org/wiki/Q252361)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Video_High_Density)  
**Source**: https://4ort.xyz/entity/video-high-density

## Summary  
Video High Density (VHD) is a videodisc format developed by JVC, designed for storing analog video and audio content on a laser-readable optical disc. It was introduced in 1983 as part of the broader videodisc technology wave but saw limited commercial success compared to other formats like LaserDisc. VHD discs were physically smaller than standard LaserDiscs and used constant angular velocity (CAV) playback.

## Key Facts  
- Official name: VHD (aliases: ブイエイチディー, Buieichidī)  
- Classifies as a videodisc — a laser- or stylus-readable random-access disc capable of analog video and audio storage  
- Developed and released by JVC in 1983  
- Physical size: approximately 7.5 inches (smaller than standard 12-inch LaserDiscs)  
- Playback method: Constant Angular Velocity (CAV), allowing frame-by-frame access  
- Supported both analog video and audio signals  
- Primarily marketed in Japan with some adoption in Europe  
- Compatible players included JVC's own VHD series such as the HR-7500U  
- Related to but distinct from LaserDisc due to physical and encoding differences  

## FAQs  
### Q: What is Video High Density used for?  
A: Video High Density (VHD) was used to store and play back analog video and audio content on optical discs. It offered high-quality visuals and precise access to individual frames, making it suitable for educational, industrial, and niche home entertainment applications.

### Q: How does VHD differ from LaserDisc?  
A: VHD discs are physically smaller at around 7.5 inches compared to the 12-inch LaserDiscs. They also utilized a different tracking system and were primarily produced by JVC, whereas LaserDisc had multiple manufacturers and wider market penetration.

### Q: Is Video High Density still in use today?  
A: No, VHD is obsolete and no longer manufactured or supported. The format saw limited adoption even during its time and has been superseded by digital media technologies like DVDs and Blu-rays.

## Why It Matters  
Video High Density represents an important chapter in the evolution of consumer video technology during the early 1980s. As one of several competing videodisc formats, VHD demonstrated the potential for compact, high-quality analog video playback using optical disc technology. Though commercially overshadowed by larger formats like LaserDisc, VHD played a role in advancing user interactivity through features like frame-accurate searching and branching capabilities. Its development reflects the technological experimentation of its era and provides insight into how companies like JVC approached next-generation media solutions before the rise of fully digital formats.

## Notable For  
- Being among the smallest videodisc formats ever produced (~7.5 inches)  
- Offering advanced interactive features including frame-accurate access and program branching  
- Utilizing Constant Angular Velocity (CAV) playback for consistent image quality  
- Having strong ties to Japan, where it received most of its marketing focus  
- Representing a technically refined but commercially underperforming alternative to LaserDisc  

## Body  

### Format Overview  
Video High Density (VHD) is a videodisc format that stores analog video and audio data optically. Discs are read by a laser beam, enabling non-contact playback and improved durability over magnetic tape systems. Unlike many contemporary formats, VHD emphasized precision control and interactivity, supporting functions like still-frame display and jump-play navigation.

### Technical Specifications  
- **Physical Dimensions**: ~7.5 inches in diameter  
- **Playback Method**: Constant Angular Velocity (CAV)  
- **Storage Capacity**: Up to 60 minutes per side depending on recording density  
- **Signal Type**: Analog composite video and stereo audio  
- **Tracking System**: Pre-groove tracking with wobble signal synchronization  

### Development and Release  
Developed by JVC, VHD launched in 1983 alongside compatible players such as the HR-7500U. While intended for global markets, the format found primary traction in Japan and parts of Europe. Despite technical merits, competition from established formats like Betamax, VHS, and especially LaserDisc limited its widespread adoption.

### Market Position and Legacy  
Although technologically sophisticated, VHD struggled against more widely adopted standards. By the late 1980s, the emergence of CD-ROM and later DVD rendered all analog videodisc formats—including VHD—obsolete. Today, surviving units exist mainly in private collections and museums dedicated to preserving obsolete media technologies.

## References

1. Freebase Data Dumps. 2013