JVC RX-D401, RX-D702, RX-D402 manual Impulse Response

JVC exclusive DSP

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RX-D702 RX-D402

*Also applies to RX-D401

To recreate an environment’s sound field, a real hall or cinema’s sound field is measured for data. For measurements, a pulse noise is emitted, its direct and indirect sounds are picked up by microphones, and their data is recorded. This is the approach adopted by other home theater receiver/processor manufacturers.

But measuring the sound field of an existing environment entails inaccuracies in the methodology. For instance, microphones have different characteristics, from model to model and from unit to unit. The measured data gives clues to time and level of a sound, but not to the direction. Measurements are made only at selected spots. Softest sounds are not captured accurately.

Sound field simulation by DSP, on the other hand, can produce accurate data by supplying parameters, such as the shape of a hall, the shape and acoustic properties of interior materials, and the presence/absence of an audience. Because this data is not based on actual measurements that could be affected by the measuring equipment used or its inaccuracy, it allows the accurate recreation of the frequency response and even the direction of each reflection.

Impulse Response	Level	Direct Sound
		Early Reflections

Time

Reverberations

Time Series Analysis of Simulated Hall Acoustics

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