Abstract: A method of approximating a standardized studio experience when rendering surround sound signals in a vehicle having non-standard speaker locations comprises: receiving, by an audio system of a vehicle, surround-sound signals that also include a height dimension, the surround sound signals including first channels configured according to standardized speaker locations, wherein speaker positions of the audio system do not correspond to the standardized speaker locations; performing, using the audio system, sum and difference signal processing on respective pairs of the channels around the vehicle, the sum and difference signal processing based on the speaker positions of the audio system; and rendering, using the audio system, audio in the speakers of the vehicle based on the sum and difference signal processing of the surround-sound signals.

Abstract: A method of performing multiband bass management in a vehicle comprises: separating, by an audio system in a vehicle. first bass audio information from an audio signal. the first bass audio information comprising all contents of the audio signal below a first frequency: providing second bass audio information to each of multiple woofers of the audio system of the vehicle. the second bass audio information comprising all contents of the first bass audio information above a second frequency: and providing third bass audio information to fewer than all of the multiple woofers. the third bass audio information comprising all contents of the first bass audio information other than the second bass audio information.

Abstract: A method of generating a multidimensional audio notification in a vehicle comprises: registering, in a vehicle having an audio system with multiple channels, an event for which a directional notification is to be generated; obtaining, from among multiple pre-rendered multidimensional sounds in a storage, a first pre-rendered multidimensional sound that is assigned to the event, the first pre-rendered multidimensional sound including audio for more than one of the multiple channels; and playing the obtained first pre-rendered multidimensional sound using the audio system.

Abstract: A method for voice browsing an integrated voice response server is described. The method includes visually displaying a representation of a choice tree for a service, where the service includes an audio menu of available actions. A selection of an action displayed in the representation is received. The method also includes automatically navigating the audio menu in order to initiate the selected action. Apparatus and computer readable media are also described.

Abstract: A method for voice browsing an integrated voice response server is described. The method includes visually displaying a representation of a choice tree for a service, where the service includes an audio menu of available actions. A selection of an action displayed in the representation is received. The method also includes automatically navigating the audio menu in order to initiate the selected action. Apparatus and computer readable media are also described.

Abstract: A bias current supply circuit (20) is provided which includes an initial current source comprising a FET (22) coupled to a current mirror circuit comprising a pair of BJTs (26 and 28). An active resistive element comprising a second FET (24) is included to stabilize an output current I.sub.0 with respect to ambient temperature variations and process variations.

Abstract: A bias current supply circuit (20) is provided which includes an initial current source comprising a FET (22) coupled to a current mirror circuit comprising a pair of BJTs (26 and 28). An active resistive element comprising a second FET (24) is included to stabilize an output current I.sub.O with respect to ambient temperature variations and process variations.

Abstract: A differential amplifier having input and output stages includes a linear offset operation circuit comprising sources providing a reference voltage and an offset correction voltage and a pair of transistors coupled for linear operation and responsive to the voltages for supplying differential related offset correction currents to the amplifier output stage for reducing offset characteristic of the amplifier stages and for reducing output noise and offset attributable to a noise component of the reference voltage source.

Abstract: A direct AC to AC supply converter in which the control of the bidirectional switches connecting each conductor of a polyphase input supply to each conductor of an output supply is effected by a data processor, the operation of the program of which is synchronized by interrupt with the input supply. The data processor calculates for each output phase 2 values representing pulse widths out of a repeating sequence of 3 (for three phase input and output supplies) and pulse generators produce 3 abutting width modulated pulses in a constant period much shorter than the periods of the supplies. The interrupt operates a software phase locked loop. The pulse generators include an interlock circuit ensuring that the width modulated pulses do not overlap and an overload detector responsive to the turn-on times of the switches. A default logic circuit responsive to hardward or software failure makes the width modulated pulses of equal duration.