In 1975, Denon became the first company to achieve fully digital audio recording using Pulse Code Modulation (PCM), marking a pivotal moment in recording technology. This breakthrough replaced analogue tape with a completely digital signal path, producing recordings with unmatched clarity, dynamic range, and consistency. Denon’s achievement proved that digital recording was not only possible but commercially viable, laying the foundation for the digital audio revolution that would define the coming decades.
Denon’s work in digital audio began in the late 1960s, when the company (then known as Nippon Columbia) developed experimental PCM systems for broadcast use.
In 1970, Denon recorded the world’s first digital test recording, but it was in 1975 that the company introduced a practical fully digital 8-channel PCM recorder, capable of capturing live orchestral performances in high fidelity.
The DN-023R PCM recorder, used with open-reel video tape, operated at 13-bit resolution and 47.25 kHz sampling rate, later upgraded to 14-bit. The system converted analogue audio signals into digital data, which were then stored as video information on a modified tape machine.
This pioneering use of existing video recorders as digital storage became the model for later PCM systems from Sony, 3M, and Soundstream.
Denon’s engineers employed this system to record classical and jazz performances, beginning with Mozart’s Symphony No. 39 by the Nippon Philharmonic Orchestra, conducted by Hiroshi Wakasugi, widely regarded as the first commercially released fully digital recording.
The sound’s purity and noise-free dynamic range impressed both engineers and listeners, demonstrating the enormous potential of digital recording.
Denon’s innovation paved the way for the digital era of professional recording. Their success directly influenced the development of other pioneering digital systems, including the Soundstream recorder in the United States (1976) and Sony’s PCM-1600 mastering system (1978), which would later be used to master early compact discs.
By proving that digital could outperform analogue in clarity, reliability, and dynamic range, Denon’s 1975 PCM recording marked the beginning of the end for analogue tape as the dominant recording medium. Within a decade, almost every major recording studio and broadcast network had adopted digital technology inspired by Denon’s breakthrough.
Denon’s 1975 development of a fully digital PCM recording system marked the first practical use of digital technology for commercial music production, setting the stage for the modern digital recording industry and influencing every digital format that followed.
