Systems, methods, apparatus, and computer-readable media for generating obfuscated speech signal
AssigneeQUALCOMM Incorporated
InventorDipanjan Sen
Life of this patent
Estimating the term…
Abstract
Arrangements are described that may be used to reduce the intelligibility of speech using masker signals which are obfuscated yet correlated versions of the speech. Other applications of pitch analysis and demodulation are also described. A system may be used to drive an array of loudspeakers to produce a sound field that includes a source component, whose energy is concentrated along a first direction relative to the array, and a masking component that is based on an estimated intensity of the source component in a second direction that is different from the first direction.
Claims43
A method of signal processing, said method comprising:
- producing a multichannel source signal that is based on a speech signal;
- producing an obfuscated speech signal that is based on the speech signal;
- producing a multichannel masking signal that is based on the obfuscated speech signal;
- and
- driving a directionally controllable transducer, in response to the multichannel source signal and the multichannel masking signal, to produce a sound field comprising (A) a source component that is based on the multichannel source signal and (B) a masking component that is based on the multichannel masking signal.
An apparatus for signal processing, said apparatus comprising:
- means for producing a multichannel source signal that is based on a speech signal;
- means for producing an obfuscated speech signal that is based on the speech signal;
- means for producing a multichannel masking signal that is based on the obfuscated speech signal;
- and
- means for driving a directionally controllable transducer, in response to the multichannel source signal and the multichannel masking signal, to produce a sound field comprising (A) a source component that is based on the multichannel source signal and (B) a masking component that is based on the multichannel masking signal.
An apparatus for signal processing, said apparatus comprising:
- a first spatially directive filter configured to produce a multichannel source signal that is based on a speech signal;
- a masking signal generator configured to produce an obfuscated speech signal that is based on the speech signal;
- a second spatially directive filter configured to produce a multichannel masking signal that is based on the obfuscated speech signal;
- and
- an audio output stage configured to drive a directionally controllable transducer, in response to the multichannel source signal and the multichannel masking signal, to produce a sound field comprising (A) a source component that is based on the multichannel source signal and (B) a masking component that is based on the multichannel masking signal.
A non-transitory computer-readable data storage medium having tangible features that cause a machine reading the features to:
- produce a multichannel source signal that is based on a speech signal;
- produce an obfuscated speech signal that is based on the speech signal;
- produce a multichannel masking signal that is based on the obfuscated speech signal;
- and
- drive a directionally controllable transducer, in response to the multichannel source signal and the multichannel masking signal, to produce a sound field comprising (A) a source component that is based on the multichannel source signal and (B) a masking component that is based on the multichannel masking signal.
Dependencies are inferred from the claim text.