A Comprehensive History of Dual-Channel FFT Audio Analyzers

A Comprehensive History of Dual-Channel FFT Audio Analyzers

The evolution of dual-channel FFT (Fast Fourier Transform) audio analyzers has significantly advanced the fields of acoustics, sound system design, and live audio engineering. This history highlights key developments and innovations, with a particular focus on Meyer Sound’s SIM systems.

Early Developments in FFT Analysis (1970s–1980s)

The foundation for modern audio analysis was laid with the advent of digital signal processing and FFT algorithms. Early instruments, though groundbreaking, were bulky and primarily used in laboratory settings.

Introduction of Dual-Channel FFT Analyzers

The 1980s saw the emergence of dual-channel FFT analyzers, which allowed for the simultaneous analysis of input and output signals. This advancement enabled the measurement of transfer functions, providing insights into a system’s frequency and phase response. Notably, Brüel & Kjær, a Danish company specializing in sound and vibration measurement, developed dual-channel FFT analyzers during this period

Meyer Sound’s SIM Systems: Pioneering Real-Time Analysis

SIM System I (1986)

In 1986, Meyer Sound introduced the Source Independent Measurement (SIM) system, a groundbreaking dual-channel FFT analyzer designed for real-time audio analysis. Unlike previous systems, SIM allowed for measurements using any audio source, including music, making it highly versatile for live sound applications .

SIM System II (1991)

Building on the success of its predecessor, SIM System II was released in 1991. It featured enhanced processing capabilities and user-friendly interfaces, making it more accessible for field use. The system’s innovations earned it the prestigious R\&D 100 Award in 1992 .

SIM System 3 (2003)

The SIM System 3, launched in 2003, integrated advanced computing power and software enhancements, providing higher resolution and faster analysis

Impact and Legacy

Meyer Sound’s SIM systems revolutionized audio analysis by introducing real-time, source-independent measurement techniques. These innovations have influenced the development of other analysis tools and have become integral in various applications, including:

Live Sound Engineering**: Facilitating real-time system tuning during performances.

Acoustic Research**: Providing detailed insights into room acoustics and system behavior.

Educational Programs**: Serving as a teaching tool in audio engineering curricula .

Modern Advancements

Today, dual-channel FFT analyzers are more accessible and feature-rich, with software solutions like Smaart, Room EQ Wizard (REW), and Open Sound Meter just to name very few amongst many others. These modern tools continue to build upon the foundational work established by early innovators, including Meyer Sound.

Conclusion

The development of dual-channel FFT audio analyzers has been marked by significant technological advancements, with Meyer Sound’s SIM systems playing a pivotal role in shaping modern audio analysis practices. Their contributions have set industry standards and continue to influence the design and optimization of sound systems worldwide.

Smaart is excellent on its own, but most users find they get much more out of it after some structured training. That’s where our seminars come in. At TZ Audio we run practical seminars, both online and in-venue. We offer seminar-only or full “all you need packages” including software & hardware. It’s simply the fastest way to become comfortable and confident with the measuring a sound system.

If you’re in Norway, Sweden, Denmark or Iceland – or elsewhere – we offer is online seminars and traveling to Norway is a valid option too of course. We’re here if you have any questions about the software or upcoming seminars.

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