For much of the 20th century, video was an analogue medium, where images were represented as continuously varying electrical signals. 

However, analogue technology had limitations — it was prone to signal degradation, suffered from generation loss during copying, and offered limited flexibility for editing and distribution. The rise of digital electronics in the latter half of the century opened the door to a new way of capturing, processing, storing, and transmitting video.

The analogue-to-digital transformation was not a single invention, but a multi-decade journey involving pioneering engineers, global standards bodies, and the convergence of computing with broadcasting. From the first digital video experiments at Bell Labs in the 1960s, to the introduction of the CCIR 601 standard in the 1980s, and finally to today’s IP-based streaming and Ultra HD broadcasting, this shift revolutionized the AV industry.

Here’s a structured journey with the key milestones and inventors:

1. Analogue Video Era (1920s–1970s)

Before digital, all video was analogue — continuous waveforms representing brightness (luma) and color (chroma).

• 1927 – First mechanical television:

  • Inventor: John Logie Baird (Scotland)

  • Used spinning disks and neon lamps to scan and display images.

• 1930s–1950s – Electronic TV:

  • Inventor: Vladimir Zworykin (RCA, USA) and Philo Farnsworth (USA) independently developed the cathode ray tube (CRT) camera (Iconoscope) and receiver.

  • Introduced broadcast standards: NTSC (USA), PAL (Europe), SECAM (France/Russia).

• Analogue video connectors:

  • RCA, BNC, SCART, S-Video, VGA.

  • Video storage: magnetic tape (Ampex Quadruplex VTR, 1956, Charles Ginsburg team).

2. Digital Video Concepts Emerge (1960s–1980s)

The first moves toward digital representation of video started in labs.

• 1967 – First digital video experiments at Bell Labs using PCM (pulse-code modulation).

• 1972 – A. Michael Noll (Bell Labs) demonstrated digital image processing.

• Late 1970s – Digital frame stores allowed still frames from analogue video for editing.

3. The True Digital Video Breakthrough (1980s–1990s)

Digital video meant converting analogue waveforms into binary data via ADC (Analog-to-Digital Converters) and back via DAC.

• 1981 – Sony & NHK demo early high-definition TV (HDTV) prototypes (still analogue).

• 1984 – ITU publishes CCIR 601 standard (now Rec. 601) for digital component video (Y’CbCr).

• 1990s – Digital Betacam, DV, DVCAM formats replace analogue tape in professional environments.

Key inventors & contributors:

• Charles Poynton – widely recognized for standardizing digital video color encoding.

• Dr. Hiroshi Kanekiyo (NHK) – HDTV encoding pioneer.

4. Consumer Digital Video Boom (1995–2005)

• 1995 – DVD introduced (MPEG-2 compression).

• 1999 – DV camcorders become mainstream.

• 2003 – HDV and early HD cameras appear.

• Connectors start shifting: VGA (analogue Video) → DVI (digital Video) → HDMI (digital Video + Digital audio).

Inventors & companies:

• HDMI – developed in 2002 by consortium: Hitachi, Panasonic, Philips, Silicon Image, Sony, Thomson, Toshiba. (HDMI Licensing Administrator, Inc.)

5. Full Digital Era & IP Video (2005–Present)

• Broadcast & cinema: Digital cinema projectors (DLP by Larry Hornbeck, Texas Instruments).

• AV distribution: SDI → HD-SDI → 12G-SDI; NDI, SMPTE 2110 over IP.

• Analogue video essentially phased out in pro AV and broadcast by 2015. (AV-Analogue sunset)

Analogue → Digital Transformation Summary