Abstract: A sport event transducer having an output element that can emit a perceivable output in response to an event that relates to a sport team, for example by emitting an audio-visual output when a particular football team scores. The transducer can be removable attached to a sport garment such as a cap or jersey, or can be an integral part of the garment. A transmission system remotely controls such transducers in response to sport team events by broadcasting an RF signal carrying team event messages, for example by transmitting an FM radio-data broadcast that carries a team event message embedded in the FM signal as RDS data. The sport event transducer receives and decodes such RF broadcast signals. If the transducer receives a team event message that relates to the transducer's affiliated team, the transducer's output element emits an audio and/or visual output signal in response to the message.

Abstract: A sport event transducer having an output element that can emit a perceivable output in response to an event that relates to a sport team, such as for example by emitting an audio-visual output when a particular football team scores a touchdown. The transducer can be removable attached to a sport garment such as a cap or jersey, or can be an integral part of the garment. A transmission system remotely controls such transducers in response to sport team events by broadcasting an RF signal carrying team event messages, such as for example by transmitting an FM radio-data broadcast that carries a team event message embedded in the FM signal as RDS data. The sport event transducer receives and decodes such RF broadcast signals. If the transducer receives a team event message that relates to the transducer's affiliated team, the transducer's output element emits an audio and/or visual output signal in response to the message.

Abstract: A system and method for controlling a plurality of sport event transducers, each of which includes an output element that can emit a perceivable output in response to an event that relates to a sport team, such as for example by emitting an audio-visual output when a particular football team scores a touchdown. The system remotely controls such transducers in response to sport team events by broadcasting an RF signal carrying team event messages, such as for example by transmitting an FM radio-data broadcast that carries a team event message embedded in the FM signal as RDS data. The sport event transducer receives and decodes such RF broadcast signals. If the transducer receives a team event message that relates to the transducer's affiliated team, the transducer's output element emits an audio and/or visual output signal in response to the message.

Abstract: A sport event transducer having an output element that can emit a perceivable output in response to an event that relates to a sport team, such as for example by emitting an audio-visual output when a particular football team scores a touchdown. The transducer can be removable attached to a sport garment such as a cap or jersey, or can be an integral part of the garment. A transmission system remotely controls such transducers in response to sport team events by broadcasting an RF signal carrying team event messages, such as for example by transmitting an FM radio-data broadcast that carries a team event message embedded in the FM signal as RDS data. The sport event transducer receives and decodes such RF broadcast signals. If the transducer receives a team event message that relates to the transducer's affiliated team, the transducer's output element emits an audio and/or visual output signal in response to the message.

Abstract: A bus powered device includes a signal processing control circuit connected to and powered by a bus at a predetermined operating current and a bus current modulator circuit interconnected in series with a signal processing control circuit to the bus for providing a bipolar communication signal having an average current of substantially zero; the total series current of both the circuits is only the current required by the signal processing control circuit or the absolute value of the most negative current excursion during communication, whichever is greater.

Abstract: A bus powered device includes a signal processing control circuit connected to and powered by a bus at a predetermined operating current and a bus current modulator circuit interconnected in series with a signal processing control circuit to the bus for providing a bipolar communication signal having an average current of substantially zero; the total series current of both the circuits is only the current required by the signal processing control circuit or the absolute value of the most negative current excursion during communication, whichever is greater.

Abstract: A logarithmic amplifier is provided with a calibration circuit to allow for current measurement over a wide-dynamic range that includes extremely low current levels in a manner which mitigates or eliminates sensitivity to temperature. Calibration currents are generated by application of a series of voltage ramps of selectable slope to a capacitor. This provides a set of known current levels, selectable over a range of decades, for periodic calibration of the logarithmic amplifier. The selectable calibration currents can also be advantageously used to provide a fixed, known bias current to the input of the logarithmic amplifier to improve the response time of the amplifier for measurement of small sensor currents on the order of 10-100 fA.