Electrical audio signal processing systems and devices – Monitoring of sound
Patent
1995-07-24
1998-05-12
Isen, Forester W.
Electrical audio signal processing systems and devices
Monitoring of sound
381 12, 381 58, 381119, H04R 2900
Patent
active
057518190
ABSTRACT:
For professional audio operations such as recording and broadcasting, an LED bar-graph display instrument monitors average and peak loudness levels of stereophonic audio signals that have been encoded in serial digital format such as AES/EBU digital audio format. Internal audio processing circuitry, that can be implemented digitally with a custom chip gate array set, receives as input a serial stream of digital stereo audio data and converts this to ballistically conditioned logarithmic average and peak levels which are simultaneous displayed, generally simulating the ballistics of contemporary standard electronically displayed loudness meters such as the Dorrough analog model. The peak hold can be switched manually or internally between three hold durations: indefinite, 3 seconds or zero. A preferred dual embodiment provides digital implementation driving a pair of LED bar-graph displays side-by-side in vertical or horizontal orientation for stereo applications, and provides selectable display of stereo signals or sum and difference signals. A special peak capture circuit ensures that even very narrow peak levels are indicated at full amplitude despite the controlled ballistic rise rate. Over-range is indicated by a color change of three top display segments.
REFERENCES:
patent: 4528501 (1985-07-01), Dorough et al.
patent: 4637047 (1987-01-01), Haino
patent: 4839584 (1989-06-01), Fukuda et al.
patent: 5266908 (1993-11-01), Koulopoulos et al.
Isen Forester W.
McTaggart J. E.
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