Patent application number | Description | Published |
20080228744 | METHOD AND A SYSTEM FOR AUTOMATIC EVALUATION OF DIGITAL FILES - There is provided a method for automatic evaluation of target files, comprising the steps of building a database of reference files; for each target file, forming a training set comprising files from the database of reference files and building a test set from features of the target file; dynamically generating a learning model from the training set; and applying the learning model to the test set, whereby a value corresponding to the target file is predicted. | 09-18-2008 |
20150255088 | METHOD AND SYSTEM FOR ASSESSING KARAOKE USERS - A karaoke user's performance is recorded, and from the recorded file of the user's rendering of the song, the notes, i.e. the sung melody, is compared with the notes, i.e. the melody, of a reference file of the corresponding song. The comparison is based on an analysis of blocks of samples of sung notes, i.e. of an a cappella voice, and on a detection of the energy envelope of the notes, taking into account pitch and duration of the notes. The results of the comparison give an assessment of the performance of the karaoke in terms of pitch and note duration, as a score. | 09-10-2015 |
Patent application number | Description | Published |
20090046352 | Low-average-power parabolic pulse amplifiction - There is provided a parabolic pulse amplifier for amplifying a pulse light signal. The amplifier comprises an ytterbium-doped amplification waveguide pumped using a pump source with a pump central wavelength substantially offset from the absorption transition peak wavelength. The pump wavelength is selected such that the absorption coefficient of pump light and the gain coefficient of the signal are substantially equal in the amplification waveguide such that the amplification gain is distributed substantially uniformly along the amplification waveguide. | 02-19-2009 |
20100128744 | SPECTRALLY TAILORED PULSED FIBER LASER OSCILLATOR - High power optical pulses generating methods and laser oscillators are provided. A light generating module generates seed optical pulses having predetermined optical characteristics. A spectrum tailoring module is then used to tailor the spectral profile of the optical pulses. The spectral tailoring module includes a phase modulator which imposes a time-dependent phase variation on the optical pulses. The activation of the phase modulator is synchronized with the passage of the optical pulse therethough, thereby efficiently reducing the RF power necessary to operate the device. | 05-27-2010 |
20100135347 | DEVICE AND METHOD FOR GENERATING BURSTS OF PICOSECOND OPTICAL SUB-PULSES - A method and device are provided for generating bursts of sub-pulses, preferably in the picosecond range. Seed pulses are first generated, and then phase modulated to spread their spectral profile to several time-dependent spectral components. The phase modulated seed pulses are then spectrally filtered to remove spectral components and retain only selected ones, creating gaps in the amplitude profile of the seed pulses which therefore form bursts of sub-pulses. Various parameters such as the modulation amplitude, the modulation frequency, the spectral characteristics of the filters and the overall amplitude of the seed pulses may be controlled to provide a great versatility and adaptability. | 06-03-2010 |
20100316072 | METHODS FOR STABILIZING THE OUTPUT OF A PULSED LASER SYSTEM HAVING PULSE SHAPING CAPABILITIES - Methods stabilize the output of a pulsed laser system using pulse shaping capabilities. In some embodiments, transient effects following a transition between a QCW regime and a pulse shaping regime are mitigated by ensuring that the average QCW optical power substantially corresponds to the average pulsed optical power outputted in a steady-state operation of the pulsed laser system in the pulse shaping regime. The QCW signal or the pulse shaping signal may be adapted for this purpose. In other embodiments, transient effects associated with non-process pulses emitted between series of consecutive process pulses are mitigated through the proper use of sequential pulse shaping. | 12-16-2010 |
20110002348 | ADJUSTABLE PULSEWIDTH PICOSECOND FIBER LASER - A pulsed fiber laser generating light pulses in the picosecond range has an adjustable pulsewidth. The fiber laser includes a figure-of-eight type laser cavity, preferably of polarization-maintaining optical fiber, defining reciprocal and non-reciprocal loops. A gain medium is disposed asymmetrically in the reciprocal loop, at a position therealong favoring coupling of light in the propagation direction of the non-reciprocal loop. A pump source is coupled to the reciprocal loop to inject pump light into the gain medium. The laser cavity is designed so that changing the pump power will directly affect the pulsewidth of the generated light pulses, providing a useful control mechanism of the pulsewidth. | 01-06-2011 |
20110170163 | SYSTEM AND METHOD FOR THE SPATIAL TAILORING OF LASER LIGHT USING TEMPORAL PHASE MODULATION - Laser systems and methods for providing an output light beam having a target spatial pattern are provided. A light generating module generates an input light beam, whose spectral profile is then tailored by imposing thereon a controllable phase modulation. The obtained spectrally tailored light beam is dispersed, using at least one spatially-dispersive element to provide an output light beam having a spatial profile which is a function of the spectral profile of the spectrally tailored light beam, The phase modulation is selected in view of the spectral profile of the input light beam and of the dispersion characteristics of the at least one spatially-dispersive element so that the spatial pattern of the output light beam matches the target spatial pattern therefor. | 07-14-2011 |
20110170564 | FIBER LASER OSCILLATORS AND SYSTEMS USING AN OPTIMIZED PHASE VARYING FUNCTION - A pulsed fiber laser oscillator and laser systems incorporating such laser oscillators are presented. The laser oscillator first includes a light generating module which generates optical pulses having an initial spectral profile. A spectrum tailoring module tailors the initial spectral profile of the optical pulses by imposing a phase variation on each optical pulse according to an optimized phase varying function. The optimized phase varying function has one of a rectified sinusoidal shape, a parabolic shape and a rectified parabolic shape. Laser systems incorporating such oscillators may be of a MOPA configuration, and may further include a nonlinear crystal for frequency conversion or a bulk solid-state amplifier. | 07-14-2011 |
20110280265 | DRIVER CIRCUIT FOR THE DIRECT MODULATION OF A LASER DIODE - A driver circuit for a laser diode provides drive signals to the electrodes of the laser diode based on a pulsed input signal. An input receives the pulsed input signal and launches it into an amplification stage which preferably includes dual amplifiers, a buffering stage and a biasing stage. The output of the laser diode is an optical signal that reproduces the pulsed input signal with high fidelity and low amplitude noise. In one embodiment, the input separates the pulsed input signal into two signal components, launched in respective inverting and non-inverting branches which each include successive amplification, buffering and biasing stages. | 11-17-2011 |
20110284507 | METHOD FOR STABLIZING AN OUTPUT OF A PULSED LASER SYSTEM USING PULSE SHAPING - A method for stabilizing an output of a pulsed laser system includes a directly modulated laser diode by mitigating the effect of switching transients on the temporal shape of the outputted pulses. The method includes controlling a pulse shaping signal to define, over time, processing and conditioning periods. During the processing periods, the pulse shaping signal has an amplitude profile tailored to produce the desired temporal shape of the output. Each conditioning period either immediately precedes or follows a processing period. During a given processing period, the amplitude profile of the pulse shaping signal is tailored so that the drive current of the laser diode is lower than its maximum value during the corresponding processing period, and is of the same order of magnitude as the laser threshold current of the laser diode. In this manner, the stability of the output during the corresponding processing period is improved. | 11-24-2011 |
20120187860 | CIRCUIT ASSEMBLY FOR CONTROLLING AN OPTICAL SYSTEM TO GENERATE OPTICAL PULSES AND PULSE BURSTS - A circuit assembly controlling an optical system to generate optical pulses is provided. The optical system includes a seed light source optically coupled to an amplitude modulator. The circuit assembly includes a control circuit which generates a pulsed seed drive signal for driving the seed laser source, as well as logic signals defining successions of ON and OFF states and having a predetermined relative timing relationship. One or more of the logic signals is delayed by a corresponding programmable delay line to adjust the relative timing relationship between the logic signals. A logic gating module combines the logic signals according to one or more logical rule, thereby providing a modulator drive signal. Using this circuit assembly, the optical system outputs an optical pulse at each ON state of the modulator drive signal synchronized with the passage of one of the seed optical pulses through the amplitude modulator. | 07-26-2012 |
20140218791 | SYSTEM AND METHOD FOR EMITTING OPTICAL PULSES IN VIEW OF A VARIABLE EXTERNAL TRIGGER SIGNAL - Method and system for emitting optical pulses in view of a desired output energy of the optical pulses and a variable external trigger signal, using a laser system having a seed laser oscillator optically coupled to one or more cascaded optical amplification stages. For each amplification stage, a plurality of sets of pump pulse parameters are provided, each associated with specific values of the output energy and the trigger period. Proper pumping parameters associated with the received desired value of the output energy and the trigger period of the received trigger signal are selected for each amplification stage, which is pumped accordingly before a seed optical pulse is launched through the system. | 08-07-2014 |
20140270637 | DUAL-INDEX OPTICAL PUMP STRIPPER ASSEMBLY - A light stripper assembly for dissipating a residual optical pump power carried by a pump light propagating in an optical fiber component is provided. The optical fiber component includes a pump cladding surrounded by an outer cladding, the outer cladding being removed from the optical fiber component along a lengthwise segment thereof. The light stripper assembly includes a pump stripper disposed about the lengthwise segment and a heat-dissipation packaging structure thermally contacting the pump stripper. The pump stripper includes an input guiding region and a stripping region having refractive indices lower and higher than the refractive index at the outermost periphery of the pump cladding, respectively, so that the pump light is at least partially guided inside the pump cladding along the input guiding region and stripped from the pump cladding along the stripping region. The heat-dissipation packaging structure absorbs and dissipates the residual power stripped by the stripping region. | 09-18-2014 |