Networked sound masking system

• US 9,307,333 B2
• Filed: 05/09/2013
• Issued: 04/05/2016
• Est. Priority Date: 02/26/2001
• Status: Expired due to Term

• Current Assignee: 777388 Ontario Limited
• Original Assignee: 777388 Ontario Limited
• Inventors: Moeller, Klaus, Moeller, Niklas, Rusu, Mircea, Derla, Carl
• Primary Examiner(s): Lao, Lun-See
• Application Number:
  US13/890,824
• Publication Number:
  US 20130243215A1
• Time in Patent Office: 1,062 Days
• Field of Search: 381/73.1, 381104-109, 381 97-100, 381/101, 381/102, 381/103, 381 711- 713, 381 941- 943, 381/57, 700/94, 709/251
• US Class Current: 1/1
• CPC Class Codes: G10K 11/1752 Masking
• CPC Class Codes: G10K 2210/3014 Adaptive noise equalizers [ANE], i.e. where part of the unwanted sound is retained
• CPC Class Codes: G10K 2210/30351 Identification of the environment for applying appropriate model characteristics
• CPC Class Codes: G10K 2210/3049 Random noise used, e.g. in model identification
• CPC Class Codes: H04K 2203/12 for acoustic communication
• CPC Class Codes: H04K 2203/34 involving multiple cooperating jammers
• CPC Class Codes: H04K 3/42 characterized by the control of the jamming frequency or wavelength
• CPC Class Codes: H04K 3/43 characterized by the control of the jamming power, signal-to-noise ratio or geographic coverage area
• CPC Class Codes: H04K 3/45 characterized by including monitoring of the target or target signal, e.g. in reactive jammers or follower jammers for example by means of an alternation of jamming phases and monitoring phases, called "look-through mode"
• CPC Class Codes: H04K 3/825 by jamming
• CPC Class Codes: H04M 11/027 Annunciator systems for hospitals
• CPC Class Codes: H04R 27/00 Public address systems circuits for preventing acoustic reaction H04R3/02; circuits for distributing signals to loudspeakers H04R3/12; monitoring or testing arrangements for public address systems H04R29/007; amplifiers H03F
• CPC Class Codes: H04R 3/002 Damping circuit arrangements for transducers, e.g. motional feedback circuits
• CPC Class Codes: H05K 5/0247 Electrical details of casings, e.g. terminals, passages for cables or wiring

Abstract

A sound masking system for shaping the ambient noise level in a physical environment. The sound masking system comprises a networked and distributed system having a number of master units coupled together and to a control unit. One or more of the master units may include satellite sound masking units which function to reproduce the sound masking signal generated by the master sound masking unit. Each of the master units is addressable over the network by the control unit enabling the control unit to program the contour, spectral band, and gain characteristics of the sound masking output signal. The system may also include a remote control unit which provides the capability to tune and adjust each master sound masking unit in situ without requiring physical access through the ceiling installation.

Claims

1. A sound masking system for controlling an ambient noise level in a physical environment, said sound masking system comprising:

(a) a communication network spanning at least a portion of said physical environment;

(b) a plurality of sound masking units, some of said sound masking units including a sound masking component for generating a sound masking output signal, at least one digital component, and a communication interface for coupling said sound making units to said communication network for receiving control signals over said communication network;

(c) a control unit, said control unit having a communication interface for coupling said control unit to said communication network for transmitting control signals over said communication network to said sound masking units, and said control signals including signals for selectively controlling the operation of said sound masking units;

(d) wherein said sound masking component comprises a random noise generating component for generating an incoherent signal output, a filter component for receiving the incoherent signal output and generating an incoherent signal output with a predetermined contour, and an output amplifier for amplifying said contour incoherent signal output, and said digital component comprising a digital potentiometer coupled to said filter component for altering the contour of said incoherent signal output in response to a control signal from said programmable controller.

2. The sound masking system as claimed in claim 1, wherein said communication interface comprises an address component for recognizing control signals intended for the sound masking unit associated with said address component.

3. The sound masking system as claimed in claim 2, wherein said control unit includes an address generator for assigning addresses to said sound masking units.

4. The sound masking system as claimed in claim 3, wherein said address generator comprises a component for generating a logical address for each of said sound masking units, and said logical address being derived from an identifier associated with each of said sound masking units.

5. The sound masking system as claimed in claim 2, wherein said sound masking unit includes a control component, said control component being responsive to at least some of said control signals for controlling characteristics of said sound masking output signal.

6. The sound masking system as claimed in claim 5, wherein said controllable characteristics of said sound masking output signal include a variable contour characteristic.

7. The sound masking system as claimed in claim 5, wherein said controllable characteristics of said sound masking output signal include a variable gain characteristic.

8. The sound masking system as claimed in claim 5, wherein said controllable characteristics of said sound masking output signal include a variable frequency characteristic.

9. The sound masking system as claimed in claim 5, wherein said controllable characteristics of said sound masking output signal include a paging volume characteristic.

10. The sound masking system as claimed in claim 1, further including a remote unit, and said control unit having a remote communication interface for receiving adjustment signals from said remote unit, and said control unit including a component for converting said adjustment signals into control signals for controlling characteristics of said sound masking output signal.

11. The sound masking system as claimed in claim 10, wherein said sound masking units include an equalizer, and said equalizer having a component for adjusting spectral characteristics of said sound masking output signal in response to a spectral control signal.

12. The sound masking system as claimed in claim 11, wherein said remote unit includes a component for receiving sound level readings for the physical environment and a component for generating an equalizer adjustment signal derived from said sound level readings, and said control unit being responsive to said equalizer adjustment signal for generating said spectral control signal.

13. The sound masking system as claimed in claim 12, wherein said component for receiving sound level readings comprises an interface to a sound level meter.

14. The sound masking system as claimed in claim 10, wherein said remote unit includes a component for receiving sound level readings for the physical environment and a component for generating a spectrum adjustment signal and said control unit being responsive to said spectrum adjustment signal for adjusting the spectrum of said sound masking signal.

15. The sound masking system as claimed in claim 10, wherein said remote unit includes a component for receiving sound level readings for the physical environment and a component for generating a volume level adjustment signal and said control unit being responsive to said volume level adjustment signal for adjusting the volume of said sound masking signal.

16. The sound masking system as claimed in claim 10, wherein said remote unit includes a component for receiving sound level readings for the physical environment and a component for generating a paging volume adjustment signal and said control unit being responsive to said paging volume adjustment signal for adjusting the paging volume.

17. A sound masking system for shaping an ambient noise level in a physical environment, the sound masking system comprises:

(a) a communication network spanning at least a portion of said physical environment;

(b) a plurality of sound masking units, some of said sound masking units including a sound masking circuit for generating a sound masking output signal for shaping the ambient noise level in the vicinity of each of said sound masking units, a programmable controller and at least one digital component for controlling operation of said sound masking circuit, and a communication interface for coupling said sound masking units to said communication network, and said programmable controller being coupled to said communication network for receiving control signals from said communication network for altering the operation of said sound masking circuit;

(c) a control unit, said control unit having a communication interface for coupling said control unit to said communication network for transmitting control signals over said communication network to said sound masking units, and said control signals including signals for controlling the operation of at least some of said sound masking units;

(d) wherein said sound masking circuit comprises a random noise generating component for generating an incoherent signal output, a filter component for receiving the incoherent signal output and generating an incoherent signal output with a predetermined contour, and an output amplifier for amplifying said contour incoherent signal output, and said digital component comprising a digital potentiometer coupled to said filter component for altering the contour of said incoherent signal output in response to a control signal from said programmable controller.

18. The sound masking system as claimed in claim 17, wherein said sound masking circuit comprises an equalizer component for receiving the incoherent signal output and generating an incoherent signal output with programmable spectral characteristics, and said digital component including a digital potentiometer coupled to said equalizer component for changing the spectral characteristics of said incoherent signal output in response to a control signal from said programmable controller.

19. The sound masking system as claimed in claim 18, wherein said digital component includes a digital potentiometer coupled to said output amplifier component for changing the output level of said sound masking output signal in response to a control signal from said programmable controller.

20. The sound masking system as claimed in claim 17, wherein said communication interface comprises an address component for recognizing control signals intended for the sound masking unit associated with said address component, and said programmable controller including a component for decoding said control signals and applying one or more of said decoded signals for controlling operation of said sound masking circuit.

21. In a networked sound masking system for controlling an ambient noise level in a physical environment, the networked sound masking system having a communication network for coupling a plurality of sound masking units, the sound masking units spanning the physical environment, the sound masking units including a sound masking component for generating a sound masking output signal, at least one digital component, and a communication interface to the communication network for receiving control signals over said communication network, and a control unit having a communication interface for coupling the control unit to the communication network for transmitting control signals to the sound masking units, and the control signals including signals for selectively controlling the operation of said sound masking units, a remote control unit for generating adjustment signals for the control unit for adjusting characteristics of the sound masking signal output produced by the sound masking units, said remote control unit comprising:

(a) a remote communication interface for transmitting the adjustment signals to the control unit, and the control unit having an external communication interface compatible with said remote communication interface;

(b) a input component for receiving sound level readings for the physical environment;

(c) a component responsive to said sound level readings for generating the adjustment signals associated with the characteristics of the sound masking output signal for the sound masking units;

(d) wherein said sound masking component comprises a random noise generating component for generating an incoherent signal output, a filter component for receiving the incoherent signal output and generating an incoherent signal output with a predetermined contour, and an output amplifier for amplifying said contour incoherent signal output, and said digital component comprising a digital potentiometer coupled to said filter component for altering the contour of said incoherent signal output in response to a control signal from said programmable controller.

22. The remote control unit as claimed in claim 21, wherein said sound masking output signal has a spectral characteristic and said component comprises a component for generating an equalizer adjustment signal associated with the spectral characteristics of the sound masking output signal.

23. The remote control unit as claimed in claim 21, wherein said sound masking output signal has a contour characteristic and said component comprises a component for generating a contour adjustment signal associated with the contour of the sound masking output signal.

24. The remote control unit as claimed in claim 21, wherein said sound masking output signal has a volume level characteristic and said component comprises a component for generating a gain level adjustment for the volume level of the sound masking output signal.