Browse Prior Art Database

System for Real-Time Simulation of Vehicular Acoustical Environments

IP.com Disclosure Number: IPCOM000100916D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 3 page(s) / 91K

Publishing Venue

IBM

Related People

Griggs, PJ: AUTHOR [+2]

Abstract

Disclosed is a system for simulating real-time acoustical environments. The system utilizes the Musical Instrument Digital Interface (MIDI), a digital data communication protocol, in conjunction with a Frequency Modulation (FM) tone generator, a Digital Sampling Unit (DSU), and a Spatial Audio Mixer (SAM). These devices are dynamically directed by software resident in the System Controller.

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This is the abbreviated version, containing approximately 52% of the total text.

System for Real-Time Simulation of Vehicular Acoustical Environments

       Disclosed is a system for simulating real-time acoustical
environments.  The system utilizes the Musical Instrument Digital
Interface (MIDI), a digital data communication protocol, in
conjunction with a Frequency Modulation (FM) tone generator, a
Digital Sampling Unit (DSU), and a Spatial Audio Mixer (SAM).  These
devices are dynamically directed by software resident in the System
Controller.

      A digital MIDI-compatible FM tone generator can be used to
realize "voices" such as a violin, horn, piano, or, in the case of
aircraft flight simulation, sounds such as flaps, landing gear, and
external winds.  Audio signals are produced by the FM tone generator
when the appropriate MIDI data, computed and transmitted by the
System Controller, is received.  Another element in the system is the
DSU.  This device digitally records an external audio signal.  The
sampled signal is stored in its random-access memory and can be
modified with complete control over amplitude and frequency filters,
envelopes, and modulation. The stored sample then produces the
desired audio signal in response to MIDI data received from the
System Controller. The DSU is used to store and reproduce the primary
acoustical environment of the vehicle being simulated.  The SAM is
also driven by the System Controller.  The SAM provides, in response
to MIDI data transmitted by the System Controller, aural localization
of external and internal audio sources in a multi-arrayed sound
field.  Refer to Fig. 1 for an overall system block diagram.

      The System Controller is interfaced with the vehicle model
system using available synchronous or asynchr...