Diversity system for noise-masking
First Claim
1. A system for noise-masking having a noise generation and masking system consisting of:
- first and second noise generators for producing random noise;
first and second narrow band equalizers respectively connected to the outputs of said first and second noise generators for producing electronic signals equivalent to equalized audio-noise in first and second channels; and
means connected to both said first and second channels for receiving and combining signals from said first and second channels to produce a third channel of electronic signal corresponding to equalized audio-noise, said electronic signals of said first, second and third channels being for controlling speakers for directing non-localizable masking noise into a work space.
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Abstract
Masking-noise speakers are positioned in an array of lines and rows to direct masking noise into a space. Two separate noise generators provide noise signals respectively to two equalizer-amplifiers which provide their signals respectively to first and second narrow band equalizers. These channel signals are respectively delivered through power amplifiers to first and second sets of speakers in the speaker array. The first and second channel signals are combined to produce a third channel signal, are power amplified, and delivered to a third set of speakers in the array so that no two adjacent speakers on any line or row are powered by the same noise signal. In a modified arrangement, the combination of the first and second channel signals is made after power amplification.
32 Citations
11 Claims
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1. A system for noise-masking having a noise generation and masking system consisting of:
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first and second noise generators for producing random noise; first and second narrow band equalizers respectively connected to the outputs of said first and second noise generators for producing electronic signals equivalent to equalized audio-noise in first and second channels; and means connected to both said first and second channels for receiving and combining signals from said first and second channels to produce a third channel of electronic signal corresponding to equalized audio-noise, said electronic signals of said first, second and third channels being for controlling speakers for directing non-localizable masking noise into a work space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A noise-masking system comprising:
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a loudspeaker array positioned to provide masking noise into a space, said loudspeaker array comprising first, second and third sets of speakers; first and second noise generators, first and second equalizers respectively connected to said first and second equalizers respectively connected to said first and second noise generators, first and second channels connected to the outputs from said first and second equalizers so that said first and second channels carry independent electrical signals corresponding to equalized audio-frequency noise, said first and second channels being respectively connected to said first and second sets of speakers; and means connected to said first and second channels for combining the signals in said first and second channels for producing a third channel of different but related equalized audio-frequency signal, said third channel being connected to said third set of speakers. - View Dependent Claims (10, 11)
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Specification