Robert L Carver

US Patent:

6373335, Apr 16, 2002

Filed:

Sep 11, 2000

Appl. No.:

09/659157

Inventors:

Robert W Carver - Snohomish WA 98290

International Classification:

H03F 338

US Classification:

330 10, 330207 A, 330297, 363 24, 381120

Abstract:

An audio amplifier comprising a power amplifier section, a power supply, and a control circuit. The power supply is made up of a positive and negative power supply section, with the positive supply section and the negative supply section delivering, respectively, positive and negative power inputs through the power amplifier section. Each power supply section comprises a transformer and a switch section to supply current pulses to the primary winding of the transformer. A filter circuit component is connected to an output of each secondary winding. The control circuit controls the strength of the current pulses of the power supply sections in accordance with the strength of the audio signal.

US Patent:

6418231, Jul 9, 2002

Filed:

Aug 9, 1999

Appl. No.:

09/370452

Inventors:

Robert W. Carver - Snohomish WA 98290

International Classification:

H04R 2500

US Classification:

381395, 381150, 381386, 181148, 181199, 29594

Abstract:

A subwoofer cabinet having a volume less that 1 ft axially aligned openings in opposed cabinet walls; first and second cages mounted on respective ones of the walls in alignment with the openings; a voice coil driven driver including an annular 225 oz. magnet affixed to the first cage; a stationary pole piece extending through the magnet and defining a magnetic gap therebetween; a voice coil mounted on a cylindrical voice coil former positioned within the gap; a cone affixed to one end of the former; a first flexible surround secured to the outer end of the cone and attached at its periphery to the first cage; a flexible spider secured to the former and at its outer periphery to the first cage; a mass driven driver including a 1. 7 lb. mass; a second flexible surround secured to the mass and to the second cage; a flexible spider attached to the second cage and to the mass; both surrounds having a uniform thickness of at least 0. 1â, an edgeroll having a diameter of at least 1.

US Patent:

6566960, May 20, 2003

Filed:

May 12, 1999

Appl. No.:

09/310618

Inventors:

Robert W. Carver - Snohomish WA 98290

International Classification:

H03F 304

US Classification:

330297, 381120

Abstract:

A subwoofer cabinet having a volume less than 1 ft ; axially aligned openings in opposed cabinet walls; first and second cages mounted on respective ones of the walls in alignment with the openings; a voice coil driven driver including an annular 225 oz. magnet affixed to the first cage; a stationary pole piece extending through the magnet and defining a magnetic gap therebetween; a voice coil mounted on a cylindrical voice coil former positioned within the gap; a cone affixed to one end of the former; a first flexible surround secured to the outer end of the cone and attached at its periphery to the first cage; a flexible spider secured to the former and at its outer periphery to the first cage; a drive amplifier capable of delivering 2,700 watts to a nominal 4 ohm resistive load and swinging 104 volts for delivering (+)v and (-)v drive signals to the voice coil for driving the voice coil driven driver through a peak-to-peak stroke of about 2. 5â while generating a large back emf sufficient to counter the applied emf and minimize current flow in the voice coil.

US Patent:

7844068, Nov 30, 2010

Filed:

Jan 4, 2006

Appl. No.:

11/325881

Inventors:

Robert W. Carver - Snohomish WA, US

Assignee:

Linear Corporation - Carlsbad CA

International Classification:

H04R 1/02

US Classification:

381354, 381152, 381 717, 267136, 2671417

Abstract:

A wall mounted speaker system which is arranged to alleviate problems of unwanted noise in the production and transmission of audio waves, particularly in the lower wave lengths from 20 to 200 hz. There is a speaker unit having a pair of vertically spaced speakers, and an inertial noise suppressing section positioned between the two speakers. The inertial noise suppressing section has an inertial mass which is moved in a back and forth motion to create an inertial offsetting force into a housing structure of the speaker section. The two speakers also create inertial forces which are also transmitted into the housing of the speaker unit, and these are substantially diminished by the interaction of the inertial forces of the speakers and those of the inertial noise suppressing system.

US Patent:

20010024509, Sep 27, 2001

Filed:

Jan 8, 2001

Appl. No.:

09/757120

Inventors:

Robert Carver - Snohomish WA, US

International Classification:

H04R025/00
H04R001/02

US Classification:

381/395000, 381/150000, 381/386000, 181/148000, 181/199000

Abstract:

A woofer apparatus having a cabinet defining a chamber, a magnet, a voice coil member positioned to reciprocate in the magnetic field of the magnet, a speaker diaphragm, and a passive radiator diaphragm. The components are arranged so that the maximum box pressure during maximum displacement mode of operation is greater than 0.2 psi. the tuned frequency of the apparatus is, in a preferred mode, at about 35 Hz, so that the passive radiator has substantially greater maximum excursion strokes at maximum displacement than the speaker diaphragm.

US Patent:

20010031060, Oct 18, 2001

Filed:

Jan 8, 2001

Appl. No.:

09/757379

Inventors:

Robert Carver - Snohomish WA, US

International Classification:

H04R001/02
H04R001/20

US Classification:

381/345000, 381/348000

Abstract:

Disclosed is a compact speaker system in which each speaker unit includes a folded ribbon loudspeaker that is mounted on the forward face of the speaker unit housing. Mounted on each side of the speaker housing is a woofer with the region in which the woofers are mounted being sealed and of relatively small volume. Each woofer is constructed to allow relatively long voice coil excursion and hence, high sound output levels. In addition, the woofers are constructed to withstand box pressure substantially greater than 0.2 lbs/inthat is created that is created within the sealed portion of the speaker housing when the woofers are being driven at high output levels. Signal processing circuitry is included for processing each channel of multi-channel audio programming such as surround sound. The signal processing arrangements of the invention include circuit stages to control channel gain over the low frequency range, the mid-frequency range and the high frequency range. An adaptive low pass filter circuit is provided with control circuitry that modifies the low frequency gain characteristic when high intensity low frequency signals are present that would otherwise cause the woofers to be over driven and possibly damaged. A sound pressure limiter circuit and associated control circuit is provided to establish channel gain so that the signal supplied to the woofers exhibit little or no clipping. A circuit arrangement is provided for synthesizing surround sound signals for the center channel and left and right surround channels when stereophonic programming is present.

US Patent:

20050036645, Feb 17, 2005

Filed:

May 19, 2003

Appl. No.:

10/441656

Inventors:

Robert Carver - Snohomish WA, US

International Classification:

H04R005/00
H04R001/02
H04R031/00

US Classification:

381395000, 381001000, 029594000

Abstract:

A subwoofer cabinet having a volume less that 1 ftaxially aligned openings in opposed cabinet walls; first and second cages mounted on respective ones of the walls in alignment with the openings; a voice coil driven driver including an annular 225 oz. magnet affixed to the first cage; a stationary pole piece extending through the magnet and defining a magnetic gap therebetween; a voice coil mounted on a cylindrical voice coil former positioned within the gap; a cone affixed to one end of the former; a first flexible surround secured to the outer end of the cone and attached at its periphery to the first cage; a flexible spider secured to the former and at its outer periphery to the first cage; a mass driven driver including a 1.7 lb. mass; a second flexible surround secured to the mass and to the second cage; a flexible spider attached to the second cage and to the mass; both surrounds having a uniform thickness of at least 0.1″, an edgeroll having a diameter of at least 1.5″, and capable of standing off internal pressures of 1.5 lbs./into 3 lbs./in; a drive amplifier capable of delivering 2,700 watts to a nominal 4 ohm resistive load and swinging 104 volts for delivering (+)-v and (−)-v drive signals to the voice coil for driving the voice coil driven driver through a peak-to-peak stroke of about 2.5″ while generating a large back emf sufficient to counter the applied emf and minimize current flow in the voice coil.

US Patent:

43095704, Jan 5, 1982

Filed:

Apr 5, 1979

Appl. No.:

6/027473

Inventors:

Robert W. Carver - Woodinville WA

International Classification:

H04S 100

US Classification:

179 1G

Abstract:

A sound recording having right and left information channels to drive right and left speakers, respectively. The right information channel has a left main stereo component having a pattern corresponding and similar to a left stereo input signal. In addition, it has a right to left compensating component having a pattern which corresponds to an inverted and delayed pattern of a right stereo input signal. In like manner, the right channel has a right main stereo component having a pattern corresponding and similar to the right stereo input signal. It also has a left to right compensating component having a pattern which corresponds to an inverted and delayed pattern of the left stereo input signal. The effect is that the main stereo components travelling to the nearest ear of a listener are not diminished substantially, while the main stereo components travelling to the further ear are diminished. The effect is a highly dimentionalized sound pattern.

Author:

Robert H. Carver

ISBN #:

0534359248

Author:

Robert H. Carver

ISBN #:

0534420842

Author:

Robert Carver

ISBN #:

0006551742

Author:

Robert Carver

ISBN #:

0534374751

Author:

Robert Carver

ISBN #:

0538865520

Author:

Robert Carver

ISBN #:

0671752960

Author:

Robert Carver

ISBN #:

0671796747

Author:

Robert Carver

ISBN #:

0719554594