Method and device for testing for audio induced sympathetic buzzes
AssigneeChrysler Corporation
InventorsJames E. Van Hout, David J. Madaj, Roland Holloman, Philip A. Kuyava
Life of this patent
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Abstract
A pre-recorded test tape or test disk which is used to isolate unwanted buzzes in an audio listening environment. The prerecording is a series of varying amplitude frequency sweeps. The frequency sweeps from the audible range of 20 Hz. to 400 Hz., while the amplitude level is set at five different levels. The amplitude of the first sweep is set to the maximum output of the audio system which will give a clean 400 Hz. pre-recorded pallet tone. Each subsequent sweep is 6 dB down from the previous sweep.
Claims9
A device for testing to eliminate loud speaker induced forced sympathetic audible vibrations within a predetermined listening environment comprising:
- audio means for responding to an audio means player to produce a pre-recorded signals, said signals including a first audio signal recorded at about 0 dB sweeping from about 30 Hz to about 250 Hz in a time period of about 20 seconds;
- a second audio signal recorded at about -6 dB sweeping from about 30 Hz to about 250 Hz in a time period of about 20 seconds;
- a third audio signal recorded at about -12 dB sweeping from about 30 Hz to about 250 Hz in a time period of about 20 seconds;
- a fourth audio signal recorded at about -18 dB sweeping from about 30 Hz to about 250 Hz in a time period of about 20 seconds;
- and
- a fifth audio signal recorded at about -24 dB sweeping from about 30 Hz to about 250 Hz in a time period of about 20 seconds.
An audio device for testing to eliminate loud speaker induced forced sympathetic audible vibrations within a predetermined listening environment, the device having recorded thereon at least one audio signal selected from the group consisting of an audio signal recorded at about 0 dB sweeping from about 30 Hz to about 250 Hz in a time period of about 20 seconds, an audio signal recorded at about -6 dB sweeping from about 30 Hz to about 250 Hz in a time period of about 20 seconds, an audio signal recorded at about -12 dB sweeping from about 30 Hz to about 250 Hz in a time period of about -18 dB sweeping from about 30 Hz to about 250 Hz in a time period of about 20 seconds, and an audio signal recorded at about -24 dB sweeping from about 30 Hz to about 250 Hz in a time period of about 20 seconds.
A method of locating loud speaker induced forced sympathetic audible vibrations within a predetermined listening environment;
- comprising the steps of:
- generating at least one audio signal selected from the group consisting of an audio signal recorded air about 0 dB sweeping from about 30 Hz to about 250 Hz in a time period of about 20 seconds, an audio signal recorded at about -6 dB sweeping from about 30 Hz to about 250 Hz in a time period of about 20 second, an audio signal recorded at about -12 dB sweeping from about 30 Hz to about 250 Hz in a time period of about 20 seconds, an audio signal recorded at about -18 dB sweeping from about 30 Hz to about 250 Hz in a time period of about 20 seconds, and an audio signal recorded at about -24 dB sweeping from about 30 Hz to about 250 Hz in a time period of about 20 seconds;
- locating forced sympathetic audible vibrations induced by said audio signal within said predetermined listening environment.
Dependencies are inferred from the claim text.