Aniruddha N Satoskar

US Patent:

20190058484, Feb 21, 2019

Filed:

Oct 23, 2018

Appl. No.:

16/168067

Inventors:

- Edinburgh, GB
Daniel J. ALLEN - Austin TX, US
John L. MELANSON - Austin TX, US
Aniruddha SATOSKAR - Round Rock TX, US
Akshay GODBOLE - Austin TX, US

Assignee:

Cirrus Logic International Semiconductor Ltd. - Edinburgh

International Classification:

H03M 1/18
H04R 3/04
H03H 19/00

Abstract:

A system may comprise a high-pass filter having an input for receiving an input signal, an output for generating an output signal, a capacitor coupled between the input and the output, a switched-capacitor resistor coupled between the output and a reference voltage, and control circuitry configured to control the reference voltage to cancel current leakage into a circuit coupled to the output. The input, the output, the capacitor, and the switched-capacitor resistor may be arranged to generate the output signal as a high-pass filtered version of the input signal and the high-pass filter may be configured to operate in a plurality of modes comprising at least a high-impedance mode and a low-impedance mode in which the resistance of the switched-capacitor resistor is significantly smaller than the resistance when in the high-impedance mode.A system may include a plurality of processing paths having a first path configured to generate a first digital signal based on an analog input signal and a second path configured to generate a second digital signal based on the analog input signal, the second path having a high-pass filter for filtering the analog input signal prior to the analog input signal being processed by the remainder of the second path, and the high-pass filter having a corner frequency. Control circuitry may be configured to determine frequency-dependent weighted proportions of the first and second digital signals to be combined into an output digital signal based on a characteristic of the analog input signal. Frequency-dependent weighted proportions may be such that the digital output signal includes spectral content of the first digital signal below the corner frequency to account for spectral content of the second digital signal below the corner frequency being filtered.A system may include an input for receiving an input signal, an output for generating an output signal, a capacitor coupled between the input and the output, a variable resistor coupled to the output and having a plurality of modes including a first mode in which the variable resistor has a first resistance and a second mode in which the variable resistor has a second resistance, and control circuitry configured to determine a difference between the input signal and the output signal and switch between modes of the plurality of modes when the difference is less than a predetermined threshold.

US Patent:

20180046239, Feb 15, 2018

Filed:

Aug 10, 2016

Appl. No.:

15/233624

Inventors:

- Edinburgh, GB
Daniel J. ALLEN - Austin TX, US
Saurabh SINGH - Cedar Park TX, US
Aniruddha SATOSKAR - Austin TX, US

Assignee:

Cirrus Logic International Semiconductor Ltd. - Edinburgh

International Classification:

G06F 1/32
G06F 1/26
H04R 3/04
H03M 1/12

Abstract:

A system may include a plurality of processing paths and a controller. The processing paths may include a first processing path configured to generate a first digital signal based on an analog input signal and one or more other processing paths each configured to consume a smaller amount of power than the first processing path, and each configured to generate a respective digital signal based on the analog input signal, wherein one of the other processing paths has a noise floor based on fidelity characteristics of the analog input signal or subsequent processing requirements of a digital output signal generated from at least one of the first digital signal and the respective digital signals. The controller may be configured to select one of the first digital signal and the respective digital signals as the digital output signal of the processing system based on a magnitude of the analog input signal.

US Patent:

20180048325, Feb 15, 2018

Filed:

Aug 11, 2016

Appl. No.:

15/234741

Inventors:

- Edinburgh, GB
Daniel J. ALLEN - Austin TX, US
Saurabh SINGH - Cedar Park TX, US
Aniruddha SATOSKAR - Austin TX, US

Assignee:

Cirrus Logic International Semiconductor Ltd. - Edinburgh

International Classification:

H03M 1/12
G06F 13/42
G06F 13/40

Abstract:

In accordance with embodiments of the present disclosure, a processing system may include a plurality of processing paths and a controller. The plurality of processing paths may include a static processing path configured to generate a first digital signal based on an analog input signal and a dynamic processing path configured to generate a second digital signal based on the analog input signal, wherein a parameter of the dynamic processing path is determined based on a characteristic of the analog input signal. The controller may be configured to select the first digital signal as a digital output signal of the processing system when a change is occurring to the characteristic and select the second digital signal as the digital output signal in the absence of change occurring to the characteristic.

US Patent:

20170374459, Dec 28, 2017

Filed:

Jun 28, 2016

Appl. No.:

15/195711

Inventors:

- Edinburgh, GB
Aniruddha SATOSKAR - Austin TX, US

Assignee:

Cirrus Logic International Semiconductor Ltd. - Edinburgh

International Classification:

H04R 3/04
G06F 3/16
H04R 29/00

Abstract:

In accordance with embodiments of the present disclosure, a method for operating a playback path comprising a first dynamic range enhancement subsystem and a second dynamic range enhancement subsystem, wherein an audio signal generated by the first dynamic range enhancement subsystem is communicated to the second dynamic range enhancement subsystem, is provided. The method may include determining a first operating parameter of one of the first dynamic range enhancement subsystem and the second dynamic range enhancement subsystem that affects behavior of the other of the first dynamic range enhancement subsystem and the second dynamic range enhancement subsystem, communicating a control signal between the first dynamic range enhancement subsystem and the second dynamic range enhancement subsystem indicative of the first operating parameter, and setting a second operating parameter of the other of the first dynamic range enhancement subsystem and the second dynamic range enhancement subsystem in response to receipt of the control signal.

US Patent:

20170245071, Aug 24, 2017

Filed:

Feb 22, 2016

Appl. No.:

15/050139

Inventors:

- Edinburgh, GB
Anand Ilango - Austin TX, US
Alvin C. Storvik - Austin TX, US
Cory Jay Peterson - Austin TX, US
Daniel John Allen - Austin TX, US
Aniruddha Satoskar - Austin TX, US

International Classification:

H04R 29/00
H03F 3/181
H03M 1/66

Abstract:

A portable audio device may be configured to measure load characteristics of headphones. The device may measure direct current (DC) and/or alternating current (AC) characteristics of the load. These characteristics may be measured by an audio component, such as an audio codec chip or integrated circuit (IC) controller, and reported to software or firmware executing on a processor coupled to the audio component. The software or firmware may then take action based on the measured load characteristics. For example, the load characteristics may be compared to a database of headphones and their known load characteristics to determine a particular headphone model or type of headphone attached to the audio output. The processor may then apply an appropriate equalization curve.

US Patent:

20170188149, Jun 29, 2017

Filed:

Dec 6, 2016

Appl. No.:

15/370576

Inventors:

- Edinburgh, GB
Aniruddha SATOSKAR - Austin TX, US

Assignee:

Cirrus Logic International Semiconductor Ltd. - Edinburgh

International Classification:

H04R 3/04
H03M 1/12
H03G 3/30

Abstract:

In accordance with embodiments of the present disclosure, a processing system comprising may include a plurality of processing paths and a filter. The plurality of processing paths may include a first processing path and a second processing path, wherein the first processing path is configured to generate a first digital signal based on an analog input signal and the second processing path is configured to generate a second digital signal based on the analog input signal. The filter may have a corner frequency and may be configured to generate a filtered digital output signal combining spectral components of the first digital signal lower than the corner frequency and spectral components of the second digital signal higher than the corner frequency to generate a filtered digital signal.

US Patent:

20160165348, Jun 9, 2016

Filed:

Feb 12, 2016

Appl. No.:

15/042757

Inventors:

- Austin TX, US
Daniel John Allen - Austin TX, US
Aniruddha Satoskar - Austin TX, US

Assignee:

Cirrus Logic, Inc. - Austin TX

International Classification:

H04R 3/00
H03F 1/02
H03F 3/185
H04R 29/00

Abstract:

In accordance with systems and methods of the present disclosure, an audio device may include an electrical terminal, an audio circuit, and a transducer load detection circuit. The electrical terminal may couple a transducer device to the audio device. The audio circuit may generate an analog audio signal, wherein the analog audio signal is coupled to the electrical terminal. The transducer load detection circuit may detect a load impedance of the transducer device when the transducer device is coupled to the audio device from characteristics measured at the electrical terminal.

US Patent:

20150078559, Mar 19, 2015

Filed:

Sep 25, 2013

Appl. No.:

14/036136

Inventors:

- Austin TX, US
Daniel John Allen - Austin TX, US
Aniruddha Satoskar - Austin TX, US

Assignee:

Cirrus Logic, Inc. - Austin TX

International Classification:

H04R 29/00

US Classification:

381 59

Abstract:

In accordance with systems and methods of the present disclosure, an audio device may include an electrical terminal, an audio circuit, and a transducer load detection circuit. The electrical terminal may couple a transducer device to the audio device. The audio circuit may generate an analog audio signal, wherein the analog audio signal is coupled to the electrical terminal The transducer load detection circuit may detect a load impedance of the transducer device when the transducer device is coupled to the audio device from characteristics measured at the electrical terminal.