Abstract: A method, system, computer program product, and device for providing product information, such as, for example, product price comparison information, product reviews, retailer information, retailer reviews, and information about similar products, to a user utilizing a mobile data processing system is provided. In one embodiment, a user, using a product code reader, such as, for example, an RFID reader, reads a product code from a tag, such as, for example, an RFID tag, located proximate to a product. The product code information determined from the product code is transmitted to a server. The server receives the product code information and retrieves the product information from a database. The server then formats the product information into, for example, a web page, and transmits the web page back to the mobile data processing system which receives the web page and presents the web page to the user.

Abstract: A microphone is disclosed which converts an audio signal directly into a digital representation by analyzing and digitizing the distortion imposed upon a signal, such as a string of regularly spaced pulses as a result of the displacement of a diaphragm, relative to a sensor, in response to the incoming acoustical signal. Other devices, systems and methods are also disclosed.

Abstract: A microphone is disclosed which converts an audio signal directly into a digital representation by analyzing and digitizing the distortion imposed upon a signal, such as a string of regularly spaced pulses as a result of the displacement of a diaphragm, relative to a sensor, in response to the incoming acoustical signal. Other devices, systems and methods are also disclosed.

Abstract: A speaker system includes a controller for driving a loudspeaker. The controller includes a sensor for detecting the present physical position of the speaker. The controller receives this position data as input, along with an audio signal to be reproduced. Using the audio signal as position data, the controller compares it with the actual sensed position data and generates an error signal. An error amplifier uses this error signal to drive the speaker, so that the speaker cone position matches the audio position defined in the audio data. In this manner, the speaker is driven by the error signal rather than the audio signal. In a preferred embodiment, the audio signal and position data are provided as digital signals, and the controller calculates the error signal in a digital signal processor.