Methods and Systems for Producing a Zone of Reduced Background Noise

• US 20070297620A1
• Filed: 06/22/2007
• Published: 12/27/2007
• Est. Priority Date: 06/27/2006
• Status: Abandoned Application

• Current Assignee: Daniel Choy
• Original Assignee: Daniel Choy
• Inventors: Choy, Daniel
• Application Number:
  US11/767,011
• Publication Number:
  US 20070297620A1
• Time in Patent Office: Days
• US Class Current: 381/73.1
• CPC Class Codes: G10K 11/17857 Geometric disposition, e.g. placement of microphones
• CPC Class Codes: G10K 11/17873 using a reference signal without an error signal, e.g. pure feedforward
• CPC Class Codes: G10K 11/17885 additionally using a desired external signal, e.g. pass-through audio such as music or speech
• CPC Class Codes: H04M 3/40 Applications of speech amplifiers
• CPC Class Codes: H04R 1/1083 Reduction of ambient noise active noise reduction per se G10K11/175; protective devices for the ear, e.g. providing acoustic protection A61F11/06
• CPC Class Codes: H04R 2420/07 Applications of wireless loudspeakers or wireless microphones
• 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 3/04 for correcting frequency response

Abstract

A system for facilitating conversational communications in an environment with background noise, the system including a microphone for sensing the background noise, a signal processor configured to process the microphone output and produce an anti-noise electrical output, and a directional speaker array configured to receive the anti-noise electrical output and directionally broadcast anti-noise audio output, the anti noise audio output destructively interfering with the environmental background noise.

Claims

1. A system for producing a zone of reduced background noise, said system comprising:

at least one microphone for sensing background noise, said at least one microphone generating a signal as a function of said background noise;

a background noise processor configured to process said signal to create an anti-noise waveform configured to reduce an amplitude of said background noise in said zone, and

at least one speaker configured to directionally broadcast said anti-noise waveforms as anti-noise audio output into said zone, wherein said anti-noise audio output destructively interferes with said background noise.

2. The system of claim 1, wherein:

said at least one microphone comprises a plurality of microphones angularly disposed said plurality of microphones generating a plurality of signals as a function of said background noise; and

said at least one speaker comprises a plurality of speakers directed at different angles with respect to said zone;

wherein said background noise processor is configured to process said plurality of signals to create corresponding, direction-specific anti-noise waveforms, and said plurality of speakers is configured to directionally broadcast said direction-specific anti-noise waveforms as anti-noise audio output for destructively interfering with said background noise.

3. The system of claim 2, wherein said background noise processor comprises an amplifier and at least a phase shift circuit for phase shifting or a polarity inverter.

4. The system of claim 2, additionally comprising a user control that controls an amplitude of said anti-noise audio output.

5. The system of claim 2, wherein said plurality of microphones comprises a directional microphone array configured to distinguish an angular direction associated with received background noise.

6. The system of claim 2, wherein at least portion of said microphones use optical means to sense background noise.

7. The system of claim 2, farther comprising:

a second plurality of microphones configured to sense speech within said zone and generate a second plurality of electronic signals as a function of said speech; and

a voice signal processor configured to process said second plurality of signals, and output a speech signal;

wherein said plurality of speakers is configured to output said speech signal so as to make said speech more audible to one or more listeners over said background noise.

8. The apparatus of claim 7, wherein at least a portion of said plurality of said second plurality of microphones are contained within earpieces configured to be worn by said one or more listeners.

9. The apparatus of claim 7, wherein at least a portion of said plurality of speakers are contained within earpieces configured to be worn by said one or more listeners.

10. The apparatus of claim 9, wherein said earpieces additionally contain said background noise processor, said first plurality of microphones, said second plurality of microphones, said plurality of speakers, and said voice signal processor;

each of said earpieces being configured to transmit said background noise and said speech to other of said earpieces, each of said earpieces being configured to receive said background noise and said speech from other of said earpieces.

11. A portable apparatus for producing a zone of reduced background noise, said apparatus comprising:

a base,

a telescoping mast having a first and a second end, said first end attached to said base;

a microphone configured to sense background noise and convert said background noise into a signal;

a background noise processor configured to process said signal and generate a corresponding anti-noise signal;

at least one speaker attached to said second end of said mast;

said at least one speaker configured to broadcast said anti-noise signal as an anti-noise audio waveform;

said anti-noise audio waveform broadcast destructively interfering said background noise, thereby creating said zone within which speech can be more clearly heard.

12. The apparatus of claim 11, further comprising a control configured to adjust an amplitude of said anti-noise waveform.

13. The apparatus of claim 11, wherein said microphone comprises a directional microphone array that additionally senses voice sources and said background noise processor is configured to distinguish between said voice sources and said background noise when producing said anti-noise waveform.

14. The apparatus of claim 13, wherein said directional microphone array is comprised of individual microphones located on the backs of chairs.

15. The apparatus of claim 11, wherein said at least one speaker comprises an array of speakers configured to generate omni-directional anti-noise output.

16. The apparatus of claim 11, further comprising:

a plurality of earpieces each having a microphone configured to convert a user'"'"'s voice into an electrical signal and a wireless transmitter configured to transmit said electrical signal as a wireless signal;

a receiver configured to receive said wireless signal;

a voice signal processor configured to process the received signal and generate a processed signal;

a radio transmitter configured to rebroadcast said processed signal, wherein each said earpiece is configured to receive said processed signal and convert said processed signal into audio output.

17. The apparatus of claim 16, further comprising a least one additional microphone configured to receive voice input from a user not wearing an earpiece, said voice input being converted into an electrical signal and transmitted to said voice signal processor.

18. The apparatus of claim 16, wherein said earpieces each comprise a wireless receiver for receiving said anti-noise signal and a speaker for outputting said anti-noise waveform.

19. A method for producing a zone of reduced background noise comprising:

sensing said background noise using an array of directional microphones, each directional microphone creating a signal representing said background noise,

sending each of said signals to a central background noise processor, said background noise processor creating a plurality of anti-noise waveforms as a function of said signals, and

directing each of the plurality of anti-noise waveforms to a plurality of directional speakers, said plurality of directional speakers directionally broadcasting said anti-noise waveforms as audio anti-noise output, said audible anti-noise output destructively interfering with a portion of said audible background noise to reduce background noise in said zone.

20. The method of claim 19, further comprising varying an amplitude of the audio anti-noise output to optimize destructive interference of the background noise in the zone.