Patents Assigned to THAT Corporation
  • Patent number: 10652689
    Abstract: Audio processing architectures are described for implementing a multi-band audio compression algorithm with advanced surround processing. Exemplary architectures can improve the fidelity and perceived sound field spread of inexpensive, cabinet mounted, stereo speakers such as those that might be found in televisions, wireless speaker systems and sound bars. Embodiments of the present disclosure can improve inexpensive, cabinet mounted, stereo speakers by providing, e.g., (i) an Advanced Surround algorithm that adds depth and height to the left/right/center sound field images, (ii) a Soft Clip algorithm to minimize the perceived artifacts caused by compressor overshoot, (iii) configurable crossover filter order adjustment to allow better isolation between bands, (iv) a compressor maximum gain adjustment to reduce overshoot and minimize noise boost, and/or (v) a center gain adjustment to emphasize the perception of the center image (dialog) in high ambient noise situations.
    Type: Grant
    Filed: January 4, 2018
    Date of Patent: May 12, 2020
    Assignee: THAT Corporation
    Inventors: Matthew Easley, Mikio Oda
  • Patent number: 9584918
    Abstract: A disclosed system and method dynamically controls the perceived volume of a stereo audio program including left and right channel signals. The system includes a dynamic volume control that operatesto maintain a perceived constant volume level of the stereo audio program; and an excessive spatial processing protection processor configured and arranged for controlling the level of a difference signal, created as a function of the right channel signal subtracted from the left channel signal (L?R), relative to the level of a sum signal, created as a function of the right channel signal plus the left channel signal. The excessive spatial processing protection processor processes the audio signals so as to control the difference (L?R) signal relative to the sum (L+R) signal. A system and method are also provided for dynamically controlling the perceived volume of a stereo audio program including left and right channel signals.
    Type: Grant
    Filed: October 16, 2012
    Date of Patent: February 28, 2017
    Assignee: THAT Corporation
    Inventors: Christopher M Hanna, Gregory Benulis
  • Patent number: 9380385
    Abstract: Systems and methods for enhancing the low frequency response of a loudspeaker for relatively low input level audio signals and protect the loudspeaker for relatively high input level audio signals make use of a crossover network configured so separate an audio input signal into at least two frequency bands including a low frequency band; and a signal compressor responsive to the energy level of the low frequency portion of an input audio signal in the low frequency band and configured to provide amplification gain on the low frequency portion of the input signal when the energy level of the low frequency portion of the input signal is relatively low. One or more peak limiters may be positioned before the summer(s), in the circuit, but after the low band compressor. The EQ unit(s) may be positioned before all processing to the L and R inputs.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: June 28, 2016
    Assignee: THAT Corporation
    Inventors: Scott Skinner, Christopher M. Hanna
  • Patent number: 9083297
    Abstract: An integrated circuit (IC) includes a programmable gain amplifier. The programmable gain amplifier comprises a first-stage amplifier configured to operate with at least one relatively high power supply voltage in order to accommodate at the input of the first-stage amplifier a relatively large range of input signals, the first-stage amplifier having a gain setting that is adjustable from a set of predetermined gain settings separated in relatively coarse increments so as to minimize the number of analog switches that must be implemented with high-voltage active devices in order to set each gain setting.
    Type: Grant
    Filed: May 7, 2013
    Date of Patent: July 14, 2015
    Assignee: THAT Corporation
    Inventor: Gary K. Hebert
  • Patent number: 8958516
    Abstract: A NICAM audio signal re-sampler may include a non-linear interpolator configured to interpolate in a non-linear manner between sequential digital samples that are based on a stream of demodulated NICAM audio samples. A phase differential calculator may be included that compares phase information at different resolutions.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: February 17, 2015
    Assignee: THAT Corporation
    Inventors: Roger R. Darr, Matthew F. Easley, Matthew S. Barnhill
  • Patent number: 8908872
    Abstract: The disclosed BTSC encoder includes a left high pass filter means for receiving a digital left channel audio signal and for digitally high pass filtering the digital left channel audio signal and thereby generating a digital left filtered signal; a right high pass filter means for receiving a digital right channel audio signal and for digitally high pass filtering the digital right channel audio signal and thereby generating a digital right filtered signal; a matrix means for receiving the digital left and digital right filtered signals, and including means for summing the digital left and digital right filtered signals and thereby generating a digital sum signal, and including means for subtracting one of the digital left and digital right filtered signals from the other of the digital left and digital right filtered signals and thereby generating a digital difference signal; a difference channel processing means for digitally processing the digital difference signal; and a sum channel processing means for d
    Type: Grant
    Filed: June 2, 2006
    Date of Patent: December 9, 2014
    Assignee: THAT Corporation
    Inventor: Christopher M. Hanna
  • Patent number: 8680920
    Abstract: A reconfigurable network arrangement of resistors and switches is constructed so that it can be coupled to one or more operational amplifiers and selectively programmed so as to set the gain of the resulting amplifier. The configuration of the network arrangement of resistors and switches to include resistors that can be connected in the feedback path in series and in parallel with each other is such as to provide a wider selection of gain settings, without the need to increase the physical area of the switches on a integrated circuit arrangement.
    Type: Grant
    Filed: August 16, 2010
    Date of Patent: March 25, 2014
    Assignee: THAT Corporation
    Inventor: Gary Hebert
  • Patent number: 8610469
    Abstract: A switching circuit for switching a time-varying input signal, the switching circuit comprising: at least one switch including a N-channel MOSFET and a P-channel MOSFET, each having a gate configured to receive a drive signal to change the ON/OFF state of the switch; and a drive circuit configured and arranged so as to selectively apply a pair of drive signals to change the ON/OFF state of the switch, the drive circuit being configured and arranged to generate the drive signals as a function of (a) a pair DC signal components sufficient to change the ON/OFF state of the switch and (b) a pair of time-varying signal components as at least a partial replica of the signal present on the source terminal of each MOSFET so that when applied with the DC signals to the gates of the re-channel MOSFET and p-channel MOSFET respectively, the drive signals will be at the appropriate level to maintain the ON/OFF state of the switch and keep the gate-source voltages of each MOSFET within the gate-source breakdown limit of th
    Type: Grant
    Filed: October 18, 2012
    Date of Patent: December 17, 2013
    Assignee: THAT Corporation
    Inventor: Gary K. Hebert
  • Publication number: 20130300503
    Abstract: An integrated circuit (IC) includes a programmable gain amplifier. The programmable gain amplifier comprises a first-stage amplifier configured to operate with at least one relatively high power supply voltage in order to accommodate at the input of the first-stage amplifier a relatively large range of input signals, the first-stage amplifier having a gain setting that is adjustable from a set of predetermined gain settings separated in relatively coarse increments so as to minimize the number of analog switches that must be implemented with high-voltage active devices in order to set each gain setting.
    Type: Application
    Filed: May 7, 2013
    Publication date: November 14, 2013
    Applicant: THAT CORPORATION
    Inventor: Gary K. Hebert
  • Patent number: 8582780
    Abstract: A television audio signal encoder includes a device that sums a left channel audio signal and a right channel audio signal to produce a sum signal. The device also subtracts one of the left and right audio signals from the other to produce a difference signal. The encoder also includes a configurable infinite impulse response digital filter that selectively uses one or more sets of filter coefficients to filter the difference signal. The set of filter coefficients is applied to the difference signal by a single multiplier in a recursive manner to prepare the difference signal for transmission.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: November 12, 2013
    Assignee: THAT Corporation
    Inventor: Matthew S. Barnhill
  • Patent number: 8526622
    Abstract: Television audio signal encoders include a matrix that sums a left channel audio signal and a right channel audio signal to produce a sum signal. The matrix also subtracts one of the left and right audio signals from the other to produce a difference signal. The encoders also include a configurable infinite impulse response digital filter that selectively uses one or more sets of filter coefficients to filter the difference signal and/or the sum signals. Each selectable set of filter coefficients is associated with a unique filtering application to prepare the difference signal for transmission. Decoders with the matrix are also disclosed.
    Type: Grant
    Filed: September 7, 2010
    Date of Patent: September 3, 2013
    Assignee: THAT Corporation
    Inventors: Matthew S. Barnhill, Roger R. Darr
  • Patent number: 8494104
    Abstract: A NICAM audio signal re-sampler may include a non-linear interpolator configured to interpolate in a non-linear manner between sequential digital samples that are based on a stream of demodulated NICAM audio samples. A phase differential calculator may be included that compares phase information at different resolutions.
    Type: Grant
    Filed: September 19, 2011
    Date of Patent: July 23, 2013
    Assignee: THAT Corporation
    Inventors: Roger R. Darr, Matthew F. Easley, Matthew S. Barnhill
  • Publication number: 20130108055
    Abstract: A disclosed system and method dynamically controls the perceived volume of a stereo audio program including left and right channel signals. The system comprises: a dynamic volume control configured and arranged so as to maintain a perceived constant volume level of the stereo audio program; and an excessive spatial processing protection processor configured and arranged for controlling the level of a difference signal, created as a function of the right channel signal subtracted from the left channel signal (L?R), relative to the level of a sum signal, created as a function of the right channel signal plus the left channel signal;; wherein the excessive spatial processing protection processor processes the audio signals so as to control the difference (L?R) signal relative to the sum (L+R) signal.
    Type: Application
    Filed: October 16, 2012
    Publication date: May 2, 2013
    Applicant: THAT CORPORATION
    Inventor: THAT Corporation
  • Patent number: 8416019
    Abstract: A digitally-controlled analog gain circuit supports a plurality of gain settings in which gain changes are made from a first setting to a new setting in response to a clocking signal. Large changes in gain are interpolated in small gain steps or increments. The clocking signal can be generated by an oscillator, or as a sequence of pulses output by a zero crossing detector. The gain circuit can apply positive gain to the signal. Alternatively, the gain circuit can apply a negative gain (attenuation) to the signal. The clocking signal can be provided in a pseudo-randomized manner to minimize unwanted signal effects such as discernable sound transients.
    Type: Grant
    Filed: August 16, 2010
    Date of Patent: April 9, 2013
    Assignee: THAT Corporation
    Inventors: Robert W. Moses, Leslie B. Tyler, Christopher Hanna
  • Patent number: 8378718
    Abstract: A switching circuit for switching a time-varying input signal, the switching circuit comprising: at least one switch including a N-channel MOSFET and a P-channel MOSFET, each having a gate configured to receive a drive signal to change the ON/OFF state of the switch; and a drive circuit configured and arranged so as to selectively apply a pair of drive signals to change the ON/OFF state of the switch, the drive circuit being configured and arranged to generate the drive signals as a function of (a) a pair DC signal components sufficient to change the ON/OFF state of the switch and (b) a pair of time-varying signal components as at least a partial replica of the signal present on the source terminal of each MOSFET so that when applied with the DC signals to the gates of the n-channel MOSFET and p-channel MOSFET respectively, the drive signals will be at the appropriate level to maintain the ON/OFF state of the switch and keep the gate-source voltages of each MOSFET within the gate-source breakdown limit of the
    Type: Grant
    Filed: August 16, 2010
    Date of Patent: February 19, 2013
    Assignee: THAT Corporation
    Inventor: Gary Hebert
  • Publication number: 20130038357
    Abstract: A switching circuit for switching a time-varying input signal, the switching circuit comprising: at least one switch including a N-channel MOSFET and a P-channel MOSFET, each having a gate configured to receive a drive signal to change the ON/OFF state of the switch; and a drive circuit configured and arranged so as to selectively apply a pair of drive signals to change the ON/OFF state of the switch, the drive circuit being configured and arranged to generate the drive signals as a function of (a) a pair DC signal components sufficient to change the ON/OFF state of the switch and (b) a pair of time-varying signal components as at least a partial replica of the signal present on the source terminal of each MOSFET so that when applied with the DC signals to the gates of the re-channel MOSFET and p-channel MOSFET respectively, the drive signals will be at the appropriate level to maintain the ON/OFF state of the switch and keep the gate-source voltages of each MOSFET within the gate-source breakdown limit of th
    Type: Application
    Filed: October 18, 2012
    Publication date: February 14, 2013
    Applicant: THAT Corporation
    Inventor: THAT Corporation
  • Publication number: 20130010193
    Abstract: A digital audio encoder, digital video conditioner, and a digital modulator are described for producing a television broadcast signal at a desired channel frequency range. Left and right audio channel signals are digitized and encoded according to a stereo standard and then combined to form a stereo audio signal. A second audio programming channel signal may be included. A video input can be digitized and conditioned to form a digital video channel. The stereo audio signal can be placed directly at a desired channel frequency by frequency modulation without the need for using an intermediate frequency. The digital video channel can be placed at a desired frequency by amplitude modulation. The digital and audio channels can be digitally combined to create a television transmission signal at a desired frequency and according to a desired standard.
    Type: Application
    Filed: September 11, 2012
    Publication date: January 10, 2013
    Applicant: THAT CORPORATION
    Inventors: Matthew Easley, Matthew Barnhill, W. Kevin Kay
  • Patent number: 8315411
    Abstract: A disclosed system and method dynamically controls the perceived volume of a stereo audio program including left and right channel signals. The system comprises: a dynamic volume control configured and arranged so as to maintain a perceived constant volume level of the stereo audio program; and an excessive spatial processing protection processor configured and arranged for controlling the level of a difference signal, created as a function of the right channel signal subtracted from the left channel signal (L?R), relative to the level of a sum signal, created as a function of the right channel signal plus the left channel signal; wherein the excessive spatial processing protection processor processes the audio signals so as to control the difference (L?R) signal relative to the sum (L+R) signal.
    Type: Grant
    Filed: November 16, 2009
    Date of Patent: November 20, 2012
    Assignee: THAT Corporation
    Inventors: Christopher M. Hanna, Gregory Benulis
  • Patent number: 8284954
    Abstract: The disclosed BTSC encoder includes a left high pass filter means for receiving a digital left channel audio signal and for digitally high pass filtering the digital left channel audio signal and thereby generating a digital left filtered signal; a right high pass filter means for receiving a digital right channel audio signal and for digitally high pass filtering the digital right channel audio signal and thereby generating a digital right filtered signal; a matrix means for receiving the digital left and digital right filtered signals, and including means for summing the digital left and digital right filtered signals and thereby generating a digital sum signal, and including means for subtracting one of the digital left and digital right filtered signals from the other of the digital left and digital right filtered signals and thereby generating a digital difference signal; a difference channel processing means for digitally processing the digital difference signal; and a sum channel processing means for d
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: October 9, 2012
    Assignee: THAT Corporation
    Inventor: Christopher M. Hanna
  • Patent number: 8264606
    Abstract: A digital audio encoder, digital video conditioner, and a digital modulator are described for producing a television broadcast signal at a desired channel frequency range. Left and right audio channel signals are digitized and encoded according to a stereo standard and then combined to form a stereo audio signal. A second audio programming channel signal may be included. A video input can be digitized and conditioned to form a digital video channel. The stereo audio signal can be placed directly at a desired channel frequency by frequency modulation without the need for using an intermediate frequency. The digital video channel can be placed at a desired frequency by amplitude modulation. The digital and audio channels can be digitally combined to create a television transmission signal at a desired frequency and according to a desired standard.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: September 11, 2012
    Assignee: THAT Corporation
    Inventors: Matthew Easley, Matthew Barnhill, William Kevin Kay