Resources Contact Us Home
Sound apparatus with howling prevention function

Image Number 6 for United States Patent #7840014.

An acoustic system that eliminates the howling that occurs when the sound outputted by the speaker feeds back to the input device. The acoustic system comprises a digital signal processor (DSP) that divides the input audio signal into different frequency bands, and reduces the audio levels for the frequency bands where howling is most likely to occur. In one embodiment, the acoustic system comprises a sound source section that generates a test tone that substantially covers the entire human audible range such that the DSP can set the filter levels according to the feedback of the test tone. In another embodiment, the sound source section stores one waveform at a given pitch and generates waveforms of other pitches based on the stored waveform. In yet another embodiment, the pitches of the generated waveforms are dispersed into four frequency bands to create a test tone that resembles a chord or a musical tone.

  Recently Added Patents
Self-correcting amplifier system
Method and system for utilizing native ethernet as a virtual memory interconnect
Control unit of a ride level control system, and ride level control system
Information processing apparatus, information processing method, and program
Systems and methods of using dynamic data for wear leveling in solid-state devices
Data recording apparatus with recording control based on defect block and control method thereof
Image forming apparatus and control method therefor
  Randomly Featured Patents
Ultrasonic detection of contrast agents
Partial block data programming and reading operations in a non-volatile memory
Container for compact discs or the like
Spirometer having individually characterized, single-use disposable sensor
Keyless entry system
Method for the manufacture of packages for drinking straws
Aerosol powder valve
Terminal for authorizations and electronic transfers of funds
Pneumatic tire having air retention innerliner containing anchored glass microspheres