Transmitter and receiver units for use in an OFDM communications system and configurable to support multiple types of services. The transmitter unit includes one or more encoders, a symbol mapping element, and a modulator. Each encoder receives and codes a respective channel data stream to generate a corresponding coded data stream. The symbol mapping element receives and maps data from the coded data streams to generate modulation symbol vectors, with each modulation symbol vector including a set of data values used to modulate a set of tones to generate an OFDM symbol. The modulator modulates the modulation symbol vectors to provide a modulated signal suitable for transmission. The data from each coded data stream is mapped to a respective set of one or more “circuits”. Each circuit can be defined to include a number of tones from a number of OFDM symbols, a number of tones from a single OFDM symbol, all tones from one or more OFDM symbols, or some other combination of tones. The circuits can have equal size or different sizes. Different circuits can be used for full rate data (e.g., active speech) and low rate data (e.g., silence periods).

Multiplexing of real time services and non-real time services for ofdm systems

Audiovisual reproduction system comprising a central unit managing a sound control circuit, and a telecommunications modem connected to a distribution network controlled by a host server, through a multitask operating system created around a tools and services library, characterized in that the operating system comprises a function that adjusts the sound control circuit to couple volumes in the various areas in which the loudspeakers in the audiovisual reproduction system are used, this function being accessible through a management mode of the multitask operating system, the coupling maintaining the ratios between the various volumes in each area when the volume in one area is modified.

Audiovisual reproduction system

A digital downloading jukebox system including a mechanism for delivering custom services to a recognized user, including services for creating playlists, communicating with others, accessing other features, etc. is provided. In some exemplary embodiments, after a user is recognized, the jukebox system allows users to access a special front-end via an Internet-enabled device or on an actual jukebox. Then, the user may, for example, create playlists, share songs with friends, send messages to friends, and access other value-added content. Such a system preferably learns about networks of friends, and enables managers to send similar messages to regular customers and/or others known to the system. In some exemplary embodiments, changes via a first user interface on a first device are reflected on second user interface on other properly-configured devices.

Digital downloading jukebox system with user-tailored music management, communications, and other tools

A method for classification recognition of gestures and gesture primitives in a touch-based user interface. In an implementation the method comprises receiving tactile image data responsive to data generated from user touch of a user touch interface comprising a sensor array. The tactile image data is processed to create a plurality of numerical values responsive to data generated from the user touch interface. These numerical values are applied to a principle component analysis operation to produce a reduced-dimensionality data vector which is applied to a classifier having a plurality of classifier outputs interpretable as probabilities. The classifier outputs provide likelihoods that an execution gesture is from a collection of pre-defined gestures, and a decision test is used to produce a decision output indicating a gesture outcome useful in user interface applications. The arrangement can recognize single finger “6D” actions of roll, pitch, yaw, left-right, forward-back, and variations in applied pressure.

Sequential classification recognition of gesture primitives and window-based parameter smoothing for high dimensional touchpad (HDTP) user interfaces

A digital downloading jukebox system including a mechanism for delivering custom services to a recognized user is provided. For example, information specific to a recognized user may be stored and optionally may include a recognized user avatar representative of the recognized user. The user avatar may be an image, video, and/or animation, which may be displayed on and/or played through the jukebox. The user avatar may be associated with transactions associated with the user. For example, an avatar may be displayed when a playlist of the recognized user is played, when a message is sent, etc. In other examples, the avatar may introduce instances of media by playing an audio and/or video message, and the avatar may sing, dance, etc. while an instance of media is playing.

Jukebox with customizable avatar

A digital wavetable audio synthesizer is described. The synthesizer can generate up to 32 high-quality audio digital signals or voices, including delay-based effects, at either a 44.1 KHz sample rate or at sample rates compatible with a prior art wavetable synthesizer. The synthesizer includes an address generator which has several modes of addressing wavetable data. The address generator's addressing rate controls the pitch of the synthesizer's output signal. The synthesizer performs a 10-bit interpolation, using the wavetable data addressed by the address generator, to interpolate additional data samples. When the address generator loops through a block of data, the signal path interpolates between the data at the end and start addresses of the block of data to prevent discontinuities in the generated signal. A synthesizer volume generator, which has several modes of controlling the volume, adds envelope, right offset, left offset, and effects volume to the data. The data can be placed in one of sixteen fixed stereo pan positions, or left and right offsets can be programmed to place the data anywhere in the stereo field. The left and right offset values can also be programmed to control the overall volume. Zipper noise is prevented by controlling the volume increment. A synthesizer LFO generator can add LFO variation to: (i) the wavetable data addressing rate, for creating a vibrato effect; and (ii) a voice's volume, for creating a tremolo effect. Generated data to be output from the synthesizer is stored in left and right accumulators. However, when creating delay-based effects, data is stored in one of several effects accumulators. This data is then written to a wavetable. The difference between the wavetable write and read addresses for this data provides a delay for echo and reverb effects. LFO variations added to the read address create chorus and flange effects. The volume of the delay-based effects data can be attenuated to provide volume decay for an echo effect. After the delay-based effects

Monolithic PC audio circuit with enhanced digital wavetable audio synthesizer

An analog-to-digital conversion circuit is described which includes a front end sigma-delta modulator circuit, a multi-stage digital decimation filter circuit, and a digital compensation filter circuit. An overrange detect circuit is also provided.

Delta-sigma ADC with multi-stage decimation filter and gain compensation filter

An apparatus is disclosed for generating an output signal in response to an input signal having a variable input level. The output signal has an output frequency which varies to represent variations in the input level. The apparatus comprises a processing circuit for implementing a digital signal processing algorithm to generate control signals in response to the input signal, which control signals are representative of the variable input level, and an oscillator circuit for generating the output signal in response to the control signals. The control signals include a first control signal representing a first output frequency, a second control signal representing a second output frequency, and at least one intermediate control signal representing output frequencies intermediate the first and second output frequencies. The processing circuit generates at least one intermediate control signal whenever the output signal varies between the first and the second output frequencies which serves to "soften" the transition between the first and second output frequencies and reduces noise which usually is generated by such sudden changes in output frequency.

Frequency controlled recursive oscillator having sinusoidal output

An efficient implementation of GMSK modulators achieved by taking advantage of symmetry properties of the premodulation filter is described. The design bypasses typical processing steps such as modulating waveform ROM lookup, integration, and sine/cosine ROM lookup, and therefore does not introduce the related errors. A design for a cordless telephony IC with a bit rate of 72 kbps and 64 samples per symbol was implemented using only simple logic and 128/spl times/6 bits of ROM plus 2 simple 6b+sign DACs.

Efficient implementation of an I-Q GMSK modulator

A lighting system includes one or more methods and systems to control the color spectrum of a lamp in response to both temperature and dim levels. In at least one embodiment, the lighting system includes a controller to control a correlated color temperature (CCT) and intensity of the lamp by independently adjusting currents to electronic light sources based on a dim level of the lighting system and temperature of the lighting system. The controller controls a first current to a first set of LEDs and a second current to a second set of LEDs. The control of the first current by the controller is jointly dependent on a dim level and temperature in the lighting system. In at least one embodiment, the control of the second current is dependent on the dim level or the dim level and temperature.

Alfredo R. Linz

Papers

Monolithic PC audio circuit with enhanced digital wavetable audio synthesizer

Delta-sigma ADC with multi-stage decimation filter and gain compensation filter

Frequency controlled recursive oscillator having sinusoidal output

Efficient implementation of an I-Q GMSK modulator

Color Coordination Of Electronic Light Sources With Dimming And Temperature Responsiveness