Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for object recognition neural network for amodal center prediction. One of the methods includes receiving an image of an object captured by a camera. The image of the object is processed using an object recognition neural network that is configured to generate an object recognition output. The object recognition output includes data defining a predicted two-dimensional amodal center of the object, wherein the predicted two-dimensional amodal center of the object is a projection of a predicted three-dimensional center of the object under a camera pose of the camera that captured the image.

Abstract: An electronic device may include wireless circuitry with a processor, a transceiver, an antenna, and a front-end module coupled between the transceiver and the antenna. The front-end module may include one or more power amplifiers for amplifying a signal for transmission through the antenna. A power amplifier may include multiple amplifier stages. Current sharing or reuse may occur between two amplifier stages in the power amplifier via a current flow path between the two amplifier stages. A power supply voltage line may be connected to the current flow path and may provide the downstream amplifier stage with a supplemental supply current based on which the downstream amplifier stage can amplify a radio-frequency signal received from the upstream amplifier stage.

Abstract: Wireless circuitry can have an antenna connected to a transmitting amplifier and a receiving amplifier. The wireless circuitry may be operable in a transmit mode during which only the transmitting amplifier is active and in a receive mode during which only the receiving amplifier is active. The transmitting amplifier may be connected to the antenna via a balun and a radio-frequency coupler without an intervening switch that is enabled during the transmit mode and disabled during the receive mode. The transmitting amplifier may include input transistors, cascode transistors, first switches configured to selectively decouple gate terminals of the cascode transistors from a bias voltage, output capacitors, and second switches configured to selectively decouple the output capacitors from a ground line. The first and second switches are turned on during the transmit mode and are turned off during the receive mode to increase an output impedance of the transmitting amplifier.

Abstract: Wireless circuitry can have an antenna connected to a transmitting amplifier and a receiving amplifier. The wireless circuitry may be operable in a transmit mode during which only the transmitting amplifier is active and in a receive mode during which only the receiving amplifier is active. The transmitting amplifier may be connected to the antenna via a balun and a radio-frequency coupler without an intervening switch that is enabled during the transmit mode and disabled during the receive mode. The transmitting amplifier may include input transistors, cascode transistors, first switches configured to selectively decouple gate terminals of the cascode transistors from a bias voltage, output capacitors, and second switches configured to selectively decouple the output capacitors from a ground line. The first and second switches are turned on during the transmit mode and are turned off during the receive mode to increase an output impedance of the transmitting amplifier.

Abstract: An electronic device may include wireless circuitry with a processor, a transceiver, an antenna, and a front-end module coupled between the transceiver and the antenna. The front-end module may include one or more power amplifiers for amplifying a signal for transmission through the antenna. Radio-frequency power amplifier circuitry may include an amplifier, an input transformer for coupling radio-frequency input signals to the amplifier, an active inductor load coupled to the input transformer, and a second order intermodulation generation circuit configured to generate and inject a second order intermodulation product into the input transformer. The injected second order intermodulation product can be used to cancel out unwanted third order intermodulation products generated by the amplifier, which reduces intermodulation distortion experienced by the amplifier circuitry.

Abstract: An electronic device may include wireless circuitry with a processor, a transceiver, an antenna, and a front-end module coupled between the transceiver and the antenna. The front-end module may include one or more radio-frequency amplifiers for amplifying a radio-frequency signal. The radio-frequency amplifier may include input transistors cross-coupled with capacitance neutralization transistors and/or coupled to cascode transistors. One or more n-type gain adjustment transistors may be coupled to source terminals of the capacitance neutralization transistors. One or more p-type gain adjustment transistors may be coupled to source terminals of the cascode transistors. One or more processors in the electronic device can selectively activate one or more of the gain adjustment transistors to reduce the gain of the radio-frequency amplifier without degrading noise performance and without altering the in-band frequency response of the radio-frequency amplifier.

Abstract: An electronic device may include wireless circuitry with a processor, a transceiver, an antenna, and a front-end module coupled between the transceiver and the antenna. The front-end module may include one or more power amplifiers for amplifying a signal for transmission through the antenna. Radio-frequency power amplifier circuitry may include an amplifier, an input transformer for coupling radio-frequency input signals to the amplifier, an active inductor load coupled to the input transformer, and a second order intermodulation generation circuit configured to generate and inject a second order intermodulation product into the input transformer. The injected second order intermodulation product can be used to cancel out unwanted third order intermodulation products generated by the amplifier, which reduces intermodulation distortion experienced by the amplifier circuitry.

Abstract: A system and method for facilitating electronic commerce over a network, according to one or more embodiments, includes communicating with a user via a user device and an issuer of payment media via an issuer device over the network, the payment media being issued to the user by the issuer, receiving user instruction over the network to link the payment media to a user account related to the user, prompting the user over the network to input a secure password known only by the issuer and the user, receiving the secure password from the user over the network, verifying that the payment media is owned by the user over the network via a secure protocol, returning a response to the user related to verification of the payment media, and storing payment media verification information.

Abstract: A system and method for facilitating electronic commerce over a network, according to one or more embodiments, includes communicating with a user via a user device and an issuer of payment media via an issuer device over the network, the payment media being issued to the user by the issuer, receiving user instruction over the network to link the payment media to a user account related to the user, prompting the user over the network to input a secure password known only by the issuer and the user, receiving the secure password from the user over the network, verifying that the payment media is owned by the user over the network via a secure protocol, returning a response to the user related to verification of the payment media, and storing payment media verification information.

Abstract: Disclosed wireless tunneling system includes two wireless tunneling apparatuses that communicate with each other through the wireless link. A local wireless tunneling apparatus is coupled to a local processing apparatus through a wired connection and a remote wireless tunneling apparatus is coupled to the remote processing apparatus through another wired connection. The two processing apparatuses bi-directionally communicate with each other through the wireless link using the two wireless tunneling apparatuses as if the two processing apparatuses were connected through a wired connection.

Abstract: A system and method for facilitating electronic commerce over a network, according to one or more embodiments, includes communicating with a user via a user device and an issuer of payment media via an issuer device over the network, the payment media being issued to the user by the issuer, receiving user instruction over the network to link the payment media to a user account related to the user, prompting the user over the network to input a secure password known only by the issuer and the user, receiving the secure password from the user over the network, verifying that the payment media is owned by the user over the network via a secure protocol, returning a response to the user related to verification of the payment media, and storing payment media verification information.

Abstract: Disclosed wireless tunneling system includes two wireless tunneling apparatuses that communicate with each other through the wireless link. A local wireless tunneling apparatus is coupled to a local processing apparatus through a wired connection and a remote wireless tunneling apparatus is coupled to the remote processing apparatus through another wired connection. The two processing apparatuses bi-directionally communicate with each other through the wireless link using the two wireless tunneling apparatuses as if the two processing apparatuses were connected through a wired connection.

Abstract: Disclosed wireless tunneling system includes two wireless tunneling apparatuses that communicate with each other through the wireless link. A local wireless tunneling apparatus is coupled to a local processing apparatus through a wired connection and a remote wireless tunneling apparatus is coupled to the remote processing apparatus through another wired connection. The two processing apparatuses bi-directionally communicate with each other through the wireless link using the two wireless tunneling apparatuses as if the two processing apparatuses were connected through a wired connection.

Abstract: A system and method for facilitating electronic commerce over a network, according to one or more embodiments, includes communicating with a user via a user device and an issuer of payment media via an issuer device over the network, the payment media being issued to the user by the issuer, receiving user instruction over the network to link the payment media to a user account related to the user, prompting the user over the network to input a secure password known only by the issuer and the user, receiving the secure password from the user over the network, verifying that the payment media is owned by the user over the network via a secure protocol, returning a response to the user related to verification of the payment media, and storing payment media verification information.

Abstract: Disclosed wireless tunneling system includes two wireless tunneling apparatuses that communicate with each other through the wireless link. A local wireless tunneling apparatus is coupled to a local processing apparatus through a wired connection and a remote wireless tunneling apparatus is coupled to the remote processing apparatus through another wired connection. The two processing apparatuses bi-directionally communicate with each other through the wireless link using the two wireless tunneling apparatuses as if the two processing apparatuses were connected through a wired connection.

Abstract: A combination of a radio receiver with a detachable controller is presented. The radio receiver sends either reduced or enhanced metadata about received programming to the controller. A connection from the controller to the receiver carries commands and carries only the reduced set of metadata, such as tuned channel and tuned channel name, from the radio receiver back to the controller. The controller is authorized by the radio receiver sending a radio identifier to the controller, determination of an authentication code at the controller and communication of the determined authentication code back to the radio receiver for validation. Upon validation, an enhanced set of metadata, including song title and artist, is sent to the controller. The enhanced metadata, the reduced metadata, or both, may be encrypted. Such authorization processing is periodically performed by the radio receiver.

Abstract: A power amplifier (PA) which improves dynamic range of previous ZVS contour-based power amplifier architectures is presented. The inventive circuit combines ZVS contour-based power amplification with a current mode digital-to-analog converter (DAC) based digital polar power amplifier. The inventive elements interoperate to provide high efficiency even at large peak power back-off levels and increased dynamic range. The invention is particularly well-suited for use in modulation schemes (e.g., WLAN/LTE/WIMAX) having large peak-to-average output power ratios. Utilizing the inventive PA in generating modulation in these systems can increase RF transmitter efficiency of by approximately two-fold.

Abstract: A zero-voltage-switching contour based outphasing power amplifier having two class-E power amplifiers connected in an out-phasing architecture coupled on opposite sides of a load being driven. The pair of class-E power amplifiers receive separate digital drive signals with an amount of phase difference that is adjusted based on the load. Variable capacitor arrays are coupled in parallel on the class-E power amplifiers and controlled in response to system parameters including duty cycle of the input signal. Efficiency of the power amplifier is maintained despite variation in output loading.

Abstract: A zero-voltage-switching contour based outphasing power amplifier having two class-E power amplifiers connected in an out-phasing architecture coupled on opposite sides of a load being driven. The pair of class-E power amplifiers receive separate digital drive signals with an amount of phase difference that is adjusted based on the load. Variable capacitor arrays are coupled in parallel on the class-E power amplifiers and controlled in response to system parameters including duty cycle of the input signal. Efficiency of the power amplifier is maintained despite variation in output loading.

Abstract: A combination of a radio receiver with a detachable controller that determine sends either reduced or enhanced metadata about received programming to the detachable controller based upon periodic authorization. A connection from the detachable control device to the radio receiver carries commands to the radio receiver and carries only the reduced set of metadata, such as tuned channel and tuned channel name, from the radio receiver to the controller. The controller is authorized by sending a radio identifier from the radio receiver to the control device, determination of an authentication code at the controller and communication of the determined authentication code back to the controller for validation. Upon validation, an enhanced set of metadata, including song title and artist, is sent to the controller. The enhanced metadata, the reduced metadata, or both, are optionally able to be encrypted. The radio receiver periodically performs this authorization processing.