Abstract: An audio system for use in a confined space comprises N acoustic transducers, where N is an integer and N?2. Each acoustic transducer is configured to receive an audio signal for a respective channel of the audio system and to generate an acoustic signal therefrom, and is operably coupled to a respective filter having a phase response. The phase response of at least one of the filters is different from the phase response of at least one other of the filters at a frequency f having a corresponding wavelength ?=d/(n+½), where n is an integer and n?0 and d is a characteristic separation of two or more of the N acoustic transducers when in the confined space. Compensation is thereby achieved for a reduction in acoustic power that would otherwise occur over a range of frequencies of width ?f around frequency f.

Abstract: An audio system for use in a confined space comprises N acoustic transducers, where N is an integer and N?2. Each acoustic transducer is configured to receive an audio signal for a respective channel of the audio system and to generate an acoustic signal therefrom, and is operably coupled to a respective filter having a phase response. The phase response of at least one of the filters is different from the phase response of at least one other of the filters at a frequency f having a corresponding wavelength ?=d/(n+½), where n is an integer and n?0 and d is a characteristic separation of two or more of the N acoustic transducers when in the confined space. Compensation is thereby achieved for a reduction in acoustic power that would otherwise occur over a range of frequencies of width ?f around frequency f.

Abstract: A method and apparatus for providing and using a variable format, configuration and location keyboard image which enables a digitizing device to present a different keyboard configuration and/or location to each user so that detection by an unauthorized viewer of a personal identification number (PIN) or other secret identification number during entry will become significantly more difficult. The presentation may include a random or scrambled keyboard entry image for each customer, and a single or set of customer preselected images that will be tied to the customer's account number which is read from the magnetic strip on a personal card. In addition to the keyboard, the device provides a single write surface for capturing a signature entry so that the two security features are incorporated in a single device.

Abstract: A method and system for generating a completed payment document ready for signature in image form. The document is signed by a customer and a copy of the signature is captured in digital form. Thereafter the signature is encrypted and saved along with a digital record of the transaction.

Abstract: An electronic checkbook and method for using it. The checkbook comprises upper and lower parts which fold together when not in use. The lower part receives on its upper surface a booklet of checks. A digitizer is hingedly connected or fixed to the remainder of the lower part and operates as a keyboard in one mode when placed above the check booklet, and can be placed beneath the top check of the booklet and used in a second mode as a means for inputting signals to the remainder of the device representing information written on the check. The lower part of the checkbook also includes other elements of the device including a microprocessor, a power supply and a smart card reader/writer. The upper part includes a display screen upon which checking account information appears during use of the electronic checkbook. The method of use of the checkbook provides maintenance of a record of transactions in the account, including addition of deposits and subtraction of checks drawn on the account.

Abstract: A handwriting capture device which employs an insertable form interface over a digitizer to minimize or eliminate the need for a display. The form may include a menu corresponding to a repetitive task, a keypad, or a place for a signature. The form may be removable as a receipt, work order, invoice, or other document. The handwriting capture device also includes a housing having a top surface and a recess within the top surface, a frame for holding the form in the recess in the top surface, and circuitry for processing information entered into the digitizer. A display of minimal size may be added when the form is permanent and reusable to display signature and user prompts.

Abstract: A method and system for generating a completed payment document ready for signature in image form. The document is signed by a customer and a copy of the signature is captured in digital form. Thereafter the signature is encrypted and saved along with a digital record of the transaction.