Also, the amplitude of the subliminal message is controlled to decrease at a second rate faster than the first rate with decreasing ambient audio signal amplitudes to minimize the possibility of the subliminal message becoming supraliminal upon rapid declines in ambient audio signal amplitudes in the area. To reduce distortion of the subliminal message, its amplitude is controlled to increase at a first rate slower than the rate of increase of the amplitude of ambient audio signals from the area. This amplitude controlled subliminal message may be mixed with background music and transmitted to the shopping area. A control circuit adjusts the amplitude of an auditory subliminal anti-shoplifting message to increase with increasing amplitudes of sensed audio signals and decrease with decreasing amplitudes of sensed audio signals. H03G3/32- Automatic control in amplifiers having semiconductor devices the control being dependent upon ambient noise level or sound levelĪmbient audio signals from the customer shopping area within a store are sensed and fed to a signal processing circuit that produces a control signal which varies with variations in the amplitude of the sensed audio signals.H03G3/30- Automatic control in amplifiers having semiconductor devices.H03G3/00- Gain control in amplifiers or frequency changers without distortion of the input signal.238000006011 modification reaction Methods 0.000 description 1.238000005859 coupling reaction Methods 0.000 description 2.238000006722 reduction reaction Methods 0.000 description 4.230000005540 biological transmission Effects 0.000 claims 1.230000001276 controlling effect Effects 0.000 claims description 4.238000007493 shaping process Methods 0.000 claims description 16.
Assignors: LUNDY, RENE R., TYLER, DAVID L. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by PROACTIVE SYSTEMS Inc filed Critical PROACTIVE SYSTEMS Inc Priority to US06/210,645 priority Critical patent/US4395600A/en Application granted granted Critical Publication of US4395600A publication Critical patent/US4395600A/en Assigned to PROACTIVE SYSTEMS, INC. Original Assignee PROACTIVE SYSTEMS Inc Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Tyler Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US06/210,645 Inventor Rene R.
SUBLIMINAL RECORDING SYSTEM X1 OUTPUTS PDF
Google Patents Auditory subliminal message system and methodÄownload PDF Info Publication number US4395600A US4395600A US06/210,645 US21064580A US4395600A US 4395600 A US4395600 A US 4395600A US 21064580 A US21064580 A US 21064580A US 4395600 A US4395600 A US 4395600A Authority US United States Prior art keywords signal amplitude audio signals subliminal message ambient audio Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US4395600A - Auditory subliminal message system and method
US4395600A - Auditory subliminal message system and method