Methods and apparatuses for operating a portable device based on an accelerometer are described. According to one embodiment of the invention, an accelerometer attached to a portable device detects a movement of the portable device. In response, a machine executable code is executed within the portable device to perform one or more predetermined user configurable operations. Other methods and apparatuses are also described.

Methods and apparatuses for operating a portable device based on an accelerometer

The interactive authentication system allows a consumer to interact with a base station, such as broadcast media (e.g., television and radio) or PC, to receive coupons, special sales offers, and other information with an electronic card. The electronic card can also be used to transmit a signal that can be received by the base station to perform a wide variety of tasks. These tasks can include launching an application, authenticating a user at a website, and completing a sales transaction at a website (e.g., by filling out a form automatically). The interaction between the base station and the electronic card is accomplished by using the conventional sound system in the base station so that a special reader hardware need not be installed to interact with the electronic card. The user is equipped with an electronic card that can receive and transmit data via sound waves. In the various embodiments, the sound waves can be audible or ultrasonic (which can be slightly audible to some groups of people).

Physical presence digital authentication system

A data processing system issuing electronic certificates (6) through 'online' networks of personal computers, televisions, or other devices (3) with video monitors or telephones. Each electronic certificate (6) includes transaction data and identification data, and can be printed out on a printing device (4) linked to a consumer's personal input device (3), or electronically stored in a designated database (5) until a specified expiration date. The certificate can be used for various purposes, including use as a coupon for a discounted price on a product or service, proof of a gift or award, proof of reservation, or proof of payment. Consumers access the data processing system online, browse among their choices, and make their selections. The data processing system provides reports on the selected certificates and their use following selection. Certificate issuers (1) also have online access to the data processing system and can create or revise offers, and provide various instructions pertaining to the certificates to be issued, including limitations as to the number of certificates to be issued in total and to each individual consumer.

Interactive marketing network and process using electronic certificates

A selectable, multi-purpose card comprising a plurality of features stored in memory means operatively mounted on the card and selection means for allowing a user to select a feature in a few simple steps, preferably in a single step. In one embodiment the card includes a plurality of magnetic strips positioned on the card in a manner to allow swiping each magnetic strip separately using conventional reading devices. Each magnetic strip activates a different feature of the card. In another embodiment the card includes a programmable magnetic strip, a plurality of features stored in memory means mounted on the card, a plurality of buttons or contacts, and means for programming the magnetic strip with a different card feature. The card may also include a thin, flexible display.

Selectable multi-purpose card

A system and method are described for providing interactive television services and for switching between television programs, such as to an interactive program session from another program. An interactive server, capable of providing requested interactive video services to a set of subscribers in a given geographic area, is coupled to a network to which subscriber set top boxes are also coupled. Television programming, which may be furnished by any number of sources, is accompanied by a signal that indicates the availability of other programming, such as interactive television service related to the program being viewed, as well as information to be used in requesting such service. The user, when notified by this signal, may input to the set top box a request for a second program, such as an interactive program or application. The identity of the original program channel is stored, and a session with the video service provider is established over the network. When the session is terminated, the set top box re-tunes the television signal to the original program channel.

System and Method for Providing Television Services

The present invention includes methods and apparatus for increasing the efficiency of remote service transactions. According to the present invention, a smart card (10) includes optics (24) for receiving information from a television channel and a modem (42) for providing real-time two way communication with a remote service provider (16). To maintain system security, data that is provided to the card may be encrypted. The present invention also includes applications of the smart card such as remote financial services, near video-on-demand with automated order and billing, pay-per-view with automated order and billing, appointment TV, home shopping, real-time market studies and opinion polls and electronic gaming and sweep-stakes.

Interactive smart card system for integrating the provision of remote and local services

A method and apparatus for compensating for repeatable run-out errors in a disc drive is disclosed. The compensation is created by determining transfer function values for a servo loop in the drive as well as a sequence of repeatable run-out values for a portion of a disc. The repeatable run-out values are divided by respective transfer function values to produce compensation values that are inverse transformed to produce time-domain compensation values. These time-domain compensation values are injected into the servo loop to compensate for repeatable run-out errors.

Compensation for repeatable run-out error

A method of implementing a model based servo controller in a digital signal processor in a disc drive includes obtaining matrices for a discrete-time state-space realization of the servo controller. Controller states of the controller are scaled to reduce a worst case bound on the controller states. The controller states are transformed to a desired format which reduces a number of required mathematical operations. Further, the matrices are converted to fixed point format.

Method of implementing a linear discrete-time state-space servo control system on a fixed-point digital signal processor in a disc drive

A system and method for attenuating the effect of rotational vibration on the positioning of the read/write head (116) in a disc drive (110). The rotational acceleration of the disc drive body (110) is sensed and applied to an adaptive filter (230, 232) that produces a feedforward signal (234) designed to offset the effects of the rotational vibration. The adaptive filter (230, 232) adjusts its parameters based on the rotational acceleration signal (224), the position error signal of the servo system (212), and a transfer function relating the actual position signal (208) to the feedforward signal (234). The plant estimate of the transfer function relating the actual position signal to the feedforward signal is determined off-line and stored for use by the adaptive filter (230, 232) in adjusting its parameters during operation.

Disturbance rejection for disc drives using adaptive accelerometer feedforward servo

A method and system for providing plant variation compensation for a microactuator in a dual-stage servomechanism of a disc drive. The method includes performing indirect adaptive filtering to identify plant variation in the microactuator, and tuning a compensator for the microactuator based on the plant variation. The indirect adaptive filtering can be performed using a two-stage process, including a first stage of adaptive modeling for the dual-stage servomechanism and a second stage of generating an indirect mode-reference inverse for the microactuator. A combined process can alternatively be employed. The microactuator can be a piezoelectric microactuator which forms a PZT system. The dual-stage servomechanism also includes a coarse actuator such as a voice coil motor.

Plant variation compensation for piezoelectric microactuator in dual-stage servo of disc drives

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