What Is Timbre?
Play the same note on a violin, a flute, and your own voice and anyone can tell them apart instantly—yet the standard definition of timbre is a confession of defeat: it's *whatever is left over* once you've accounted for pitch and loudness. So what is actually left over? And why does your ear hear one oboe in a full orchestra, three strings as a single chord, and—if you detune one string slightly—those same strings as three separate sounds?
We'll chase that question from the inside of one sound out to a room full of competing ones. Starting with perception, we'll meet Helmholtz's spectrum and the missing fundamental, Schaeffer's 1948 discovery that a bell with its attack removed becomes an oboe, Grey's measurable "timbre space," and the critical bands of the ear. With that in hand we'll answer the real question—timbre vs. chord vs. mixture—through Bregman's auditory scene analysis and Stockhausen's idea that a rhythm sped up far enough *becomes* a timbre, with a detour through masking. We'll close with the payoff for those of us who build audio software: synthesis, perceptual codecs, and source separation all run on these same perceptual principles. No psychoacoustics background required.
Roth Michaels
Principal Software Engineer
Native Instruments
Roth Michaels is a Principal Software Engineer at Native Instruments, an industry leader in real-time audio software for music production and broadcast/film post-production. In his current role he is involved with software architecture and bringing together three merged engineering organizations and legacy codebases: Brainworx, iZotope, and Native Instruments. He also supports the Audio Research team to help accelerate moving research to productization and developing fast prototyping tools for product teams. Before merging with Native Instruments, when he joined iZotope, Roth was the lead library designer of a new internal cross-platform "Glass", part of which is now available as open-source. More recently in his former role as Mix/Master Software Architect, Roth helped develop the reference implementation to move iZotope's products to subscription and led the team that launched the company’s first SaaS offering for music producers. Roth studied music composition at Brandeis University and continued his studies in the Dartmouth Digital Musics program. Roth began his career in software development writing software for his own compositions, and the works of other composers and artists, and teaching MaxMSP to composers and musicians; both private instruction and designing university courses. Before joining iZotope, he was working as a consultant for small startups working on mobile applications specializing in location services and Bluetooth.