| Patent Number |
Title Of Patent |
Date Issued |
| D586328 |
Receiver |
February 10, 2009 |
|
| D585434 |
Microphone |
January 27, 2009 |
|
| D584721 |
Microphone |
January 13, 2009 |
|
| D583806 |
Microphone |
December 30, 2008 |
|
| D570827 |
Speaker |
June 10, 2008 |
|
| D557257 |
Speaker |
December 11, 2007 |
|
| 7596238 |
Howling margin measuring device |
September 29, 2009 |
| A howling margin measuring device 20 comprises processing means 28 composed of gain controlling means 21 and a compressor 22 which are connected in series and controlling means 23. The gain controlling means 21 outputs an input sound signal after giving a gain thereto. If the level o |
| 7551690 |
Transmitter and receiver |
June 23, 2009 |
| A transmitter (1) converts an input signal from a microphone (2) into a plural-bit digital signal by means of an A/D converter (4) at predetermined time intervals. An encoder (6) divides the digital signal into plural blocks and adds a parity bit to each block to thereby form a coded |
| 7430255 |
Impulse noise suppression device |
September 30, 2008 |
| Digital audio data with error detection bits added thereto is inputted to an error detecting and correcting device (4). The correcting device (4) corrects an error when the error is detected in the digital audio data. The digital audio data outputted from the error detecting and correcti |
| 7386004 |
Digital broadcast system |
June 10, 2008 |
| A broadcasting system which can monitor all input devices for their operating conditions, the broadcasting system includes input devices 1.sub.1-1.sub.M for receiving sound, output devices 3.sub.1-3.sub.N for broadcasting sound, and a controller 4. These features are interconnected t |
| 7324656 |
Wide dispersion speaker system and cover mounting structure for instrument directly mounted to f |
January 29, 2008 |
| A wide dispersion speaker system 1 comprises a cone type speaker unit 2, and a restricting element 10A. The restricting element 10A is provided with a center hole 11 at a center section thereof, and a peripheral hole 12 located outward relative to the center hole 11. The restricting |
| 7260227 |
Method and device for measuring sound wave propagation time between loudspeaker and microphone |
August 21, 2007 |
| A device 1 for measuring a propagation time of a sound wave comprises a sound source means 11 and a calculation means 12. The sound source means 11 outputs a time stretched pulse as a sound source signal input to a speaker 3. The calculation means 12 calculates a cross-correlation fu |
| 7249511 |
Method of detecting resonant frequency, method of selecting resonance frequency, and device for |
July 31, 2007 |
| A device for detecting a resonant frequency comprises a sound source, a switch, a mixer, and a sound meter. The switch and mixer are capable of switching between a first state in which the switch and mixer output a measurement signal and a second state in which the switch and mixer o |
| 7248655 |
Digital radio receiver |
July 24, 2007 |
| A receiving unit (2) receives a modulated signal resulting from modulating a carrier signal with a digital encoded train resulting from error-correction encoding a digital signal train. A demodulating unit (4) demodulates the digital encoded train from the received modulated signal. |
| 7245678 |
Digital wireless receiver using antenna diversity method |
July 17, 2007 |
| Receiving antennas 2a, 2b receive a digital modulated signal from a digital wireless microphone. The digital modulated signal comprises a carrier signal modulated with successively generated digital signal trains. A changeover switch 4 selects one of the antennas 2a, 2b in response t |
| 7035395 |
Digital communication system |
April 25, 2006 |
| The present invention provides a digital communication system which is free from noise generated in a receiver. A transmitter converts an analog input signal to a digital signal, and then a power level detector 5 compares the digital signal with a predetermined level. In accordance w |
| 6862332 |
Clock reproduction circuit |
March 1, 2005 |
| A master clock signal source (10) generates a master clock signal having a frequency equal to N times the bit rate of received data, where N is a positive integer. A modulo-N counter (12) counts the master clock signal. An edge detecting circuit (4) detects a transition of the received d |
| 6658128 |
Horn loudspeaker |
December 2, 2003 |
| An electroacoustic transducer of a horn loudspeaker emits sound, which is supplied through a sound conduit pipe to a horn and propagated out of the horn through a mouth of the horn. The sound conduit pipe is coupled to the horn via a rectangular opening in the upper one of the upper and |
| 6580801 |
Loudspeaker apparatus |
June 17, 2003 |
| A loudspeaker apparatus 1 includes a loudspeaker unit 3 and an installation device 2. The loudspeaker unit 3 includes drivers 22 and 23 and an enclosure for the drivers composed of front and rear members 20 and 21. The loudspeaker unit is detachably mounted to an installation device 2, |
| 6172635 |
Highly accurate A/D converter |
January 9, 2001 |
| An A/D converter provides a high conversion accuracy even when an input analog signal is at a low level. The A/D converter (10) comprises a first line including a first A/D conversion unit (ADC1) connected to an input terminal (1) applied with an analog signal, a second line including a |
| 5715322 |
Throat device interconnecting a plurality of drive units and a horn |
February 3, 1998 |
| A throat device for interconnecting at least two drive units and a horn is provided. The throat device comprises a substantially straight body member having one end to be coupled with the horn, and at least two curved branch members coupled with the other end of said body member such tha |
| 5285025 |
Loudspeaker horn |
February 8, 1994 |
| A speaker horn including a first and a second pair of side walls. The first pair of side walls has a first section and a second section between first and second ends, and the second pair of side walls has a third section and a fourth section between third and fourth ends. The first pair |
| 5020858 |
Method of and apparatus for forming and transporting mud clogs |
June 4, 1991 |
| A method of transporting mud, in which mud agitated and fluidized is supplied, while being pressurized by a pressurizing vane, through a check valve to a mud supply portion, and in which pressurizing air is supplied to the mud supply portion in a mud transporting direction to transport t |
| 4903419 |
Method of and apparatus for dredging sludge in high density |
February 27, 1990 |
| A method of and apparatus for continuously dredging sludge deposited on an underwater bed, at a high density of the sludge, according to which digging and scooping devices are placed in an airtight hood opened at its bottom, which is applied on the intended underwater bed and into which |
