Patent application number | Description | Published |
20120169433 | DIGITAL SIGNAL FILTER - A passive filter circuit filters an input signal to attenuate an undesired frequency. The passive filter circuit includes a first stage and a second stage. The input to the first stage is the input signal. The first stage includes a first inductor and a first branch coupled to the output of the first inductor. The first branch includes a first capacitor and a second inductor. The first stage is coupled to the second stage. The second stage includes a third inductor and a second branch coupled to the output of the third inductor. The second branch includes a second capacitor. Other embodiments are also described and claimed. | 07-05-2012 |
20120200172 | AUDIO ACCESSORY TYPE DETECTION AND CONNECTOR PIN SIGNAL ASSIGNMENT - An electronic audio host device has an audio accessory connector with multiple pins. An ultrasonic test signal source has an output coupled to a first pin of the connector. A programmable switch circuit couples a second or third pin of the connector, to a ground of the audio host device. A controller measures a signal on one of the pins of the connector while the test signal source is on, and compares the measured signal to a predetermined, stored signature. The signature is associated with one of several different accessory plug pin assignments for the connector, which can be configured using the programmable switch circuit. Other embodiments are also described and claimed. | 08-09-2012 |
20120212895 | LOW Z LINEAR VIBRATOR - A low Z linear vibrator is described well suited for use in small form factor portable devices such as a smartphone. The low Z vibrator can be configured to include a beam structure that can be attached to a vibratory mass and a low profile actuator. The low profile actuator can cause the vibratory mass to oscillate in a well-defined and predictable manner. | 08-23-2012 |
20120302293 | HAPTIC ALERT DEVICE HAVING A LINEAR VIBRATOR - A vibrator designed to be integrated into a portable electronic device as part of a haptic alert device has a linear electric motor that is coupled to actively drive a moveable weight in back-and-forth directions to produce the desired vibration. A lock mechanism has a restraining member that is biased into a lock position, which prevents the moveable weight from moving in the back-and-forth directions when the vibrator is inactive. Other embodiments are also described and claimed. | 11-29-2012 |
20130335057 | Electronic device power protection circuitry - A host electronic device may be coupled to an accessory electronic device. During normal operation, the host device may supply the accessory device with power over a power supply line. Back-powering events in which the accessory device delivers power to the host device may be prevented by interposing a protection transistor in the power supply line. A current mirror may be formed using the protection transistor and an additional transistor that produces a sense current proportional to the amount of current that is flowing through the power supply line. A current-to-voltage amplifier may produce a sense voltage that is proportional to the sense current. A bias circuit may be used to bias the sense current through the current mirror. A control circuit may compare the sense voltage to one or more reference voltages and turn off the protection transistor when appropriate to prevent back-powering of the host device. | 12-19-2013 |
20140028221 | Method of Adaptively Tuning Motor Speed - Methods and apparatuses related to adaptively tuning vibratory motors are disclosed. One embodiment takes the form of a method of adaptively tuning a vibratory motor including operating the motor at a plurality of voltage levels and recording the frequency of operation of the motor at each of the plurality of voltage levels. The method also includes creating a curve based on the recorded frequency and voltage levels and selecting a drive voltage based upon an intersection of a desired frequency of operation and the created curve. | 01-30-2014 |
20140211351 | Electronic Device With Connector Fault Protection Circuitry - An electronic device may include protection circuitry coupled to a connector port. The connector port may be a reversible connector port that receives a mating reversible connector plug with either first or second orientations. The connector port may include contacts for receiving and/or transmitting signals during communications between the electronic device and the accessory device. The protection circuitry may monitor signals received at the contacts to determine whether transient or permanent connection faults exist. In response to determining that a connection fault exists at any of the contacts, the protection circuitry may electrically disconnect the faulty contacts from processing circuitry in the electronic device. | 07-31-2014 |
20140218045 | USING PULSED DC TO DETECT CONNECTOR MATING AND UNMATING - Techniques for detecting mating and un-mating of a first connector with a second connector include providing a pulsed voltage signal at a contact of the second connector and measuring a rate of rise of voltage at the contact. If the measured voltage at the contact exceeds a threshold voltage during the time the pulsed voltage signal is applied, then it is concluded that the first connector is not present and not mated with the second connector. If the measured voltage is lower than or equal to the threshold voltage during the time of application of the voltage pulse, it is concluded that the first connector is present and mated with the second connector. | 08-07-2014 |