124 results about "Pitch variation" patented technology

A music retrieval system which take an input melody as the query. In one embodiment, changes or differences in the distribution of energy across the frequency spectrum over time are used to find breakpoints in the input melody in order to separate it into distinct notes. In another embodiment the breakpoints are identified based on changes in pitch over time. A confidence level is preferably associated with each breakpoint and/or note extracted from the input melody. The confidence level is based on one or more of: changes in pitch, absolute values of a spectral energy distribution indicator, relative values of the spectral energy distribution indicator, and the energy level of the input melody. The process of matching the input melody with songs in the music database is based on minimizing a cost computation that takes into account errors in the insertion and deletion of notes, and penalizes these errors in accordance with the confidence levels of the breakpoints and/or notes.

A method and apparatus for providing musical training is disclosed. The method/apparatus allows a user to practice voice lessons, ear training lessons, songs, and/or various musical instruments that rely on good pitch perception (such as a violin or a brass instrument). The method/apparatus displays a sequence of music notes to the user via a combination of conventional music staffs (such as a grand staff) and instances of a pitch-based representation. The method/apparatus also displays the accuracy of the user in hitting notes, the quality of his/her tone if supported, changes to his/her vocal range if desired, and tracks the user's practice history. The method/apparatus further provides features such as automatic vocal range detection, adjustment of lessons to a user's vocal range, and a display method that makes changes to the pitches of music notes clear during musical key/scale changes.

For each section forming a music piece, music template information is supplied which includes at least information indicative of a pitch variation tendency in the section. A plurality of already-composed music pieces are preferably analyzed to store a plurality of pieces of such music template information so that any users can select from the stored pieces of music template information. For a music piece to be composed, the user enters information indicative of a tendency relating to the number of notes, such as syllable information of desired words or scat words, in each section of the music piece. On the basis of one of the pieces of music template information supplied and the user-entered information indicative of the number-of-notes tendency (syllable information), the length and pitch of notes in each section can be determined, which permits automatic generation of music piece data. If the music template information is used with no modification, an automatically composed music piece will considerably resemble its original music piece. The user can freely modify the music template information to be used, so that a music piece different from its corresponding original music piece can be created with the user's intention reflected thereon. The music template information can be easily modified by any users having poor knowledge of composition, and the present composing technique can be easily used by everyone.

A method for improving a call-participant behavior, the method includes receiving an intensity data signal and an intensity variation data signal related to an ongoing call, receiving a pitch data signal and a pitch variation data signal related to the ongoing call, receiving a tempo data signal and a tempo variation data signal related to the ongoing call, receiving a channel comparison data signal related to the ongoing call, generating a real-time call progress signal based on the intensity data signal, the intensity variation data signal, the pitch data signal, the pitch variation data signal, the tempo data signal, the tempo variation data signal, and the channel comparison data signal, and sending the real-time call progress signal to a user device.

The invention discloses a constant-power control method and device for the full-load power generation working condition of a wind turbine generator, and the wind turbine generator. The constant-power control method for the full-load power generation working condition of the wind turbine generator comprises the pitch variation operation step and the electromagnetic torque variation operation step. The pitch variation operation step includes that the electromagnetic torque difference of the generator is calculated according to the current rotating speed of the generator; the gain used by PI correction is determined according to a current blade pitch angle, and the PI correction is carried out on the electromagnetic torque difference of the generator to obtain a compensation value of the pitch angle; a given value of the pitch angle is added to the compensation value of the pitch angle, pitch variation operation is carried out on the basis of the pitch variation rate converted from a required value, obtained through addition, of the pitch angle. The electromagnetic torque variation operation step includes that electromagnetic torque variation operation is carried out on the basis of a required electromagnetic torque value which is obtained by dividing the rated power of the generator by the current rotating speed of the generator. According to the constant-power control method and device for the full-load power generation working condition of the wind turbine generator, under the full-load power generation working condition, the blade pitch angle is adjusted on the basis of pitch angle compensation, the rotating speed of the generator can be more stable, the electromagnetic torque variation operation is carried out on the basis of the pitch variation operation, power fluctuation of the generator is reduced, and constant-power control is achieved.

The invention provides a propeller pitch variation control method for a large-sized wind powered generator unit. The method comprises the following steps: a rotating speed error delta omega is obtained by subtracting the practical rotating speed omega practice of a current main bearing by the rotating speed expected value omega expectation of the current main bearing, a corresponding propeller pitch angle reference value beta reference is calculated by integrating a rotating speed difference delta omega and the variation tendency by a fuzzy controller, the propeller pitch angle reference value beta reference is transmitted to the wind powered generator unit which realizes the control of the propeller pitch angle for a propeller pitch variable actuating mechanism, and the pneumatic shape of a changed propeller pitch angle blade is changed so as to enable the bearing force of the changed propeller pitch angle blade to be changed and the rotating speed of the wind powered generator unit to trace the rotating speed expected value omega expectation. The propeller pitch variation control method obviously enhances the total precision, is favorable to increasing the annual total generated energy of the wind powered generator unit, has high adaptability for complex and extreme cases, greatly enhances the operating effectiveness, furthest prolongs the mechanical life of the propeller pitch variable actuating mechanism, and also has low remodel difficulty and low cost.

A speech analysis apparatus analyzing prosodic characteristics of speech information and outputting a prosodic discrimination result includes an input unit inputting speech information, an acoustic analysis unit calculating relative pitch variation and a discrimination unit performing speech discrimination processing, in which the acoustic analysis unit calculates a current template relative pitch difference, determining whether a difference absolute value between the current template relative pitch difference and a previous template relative pitch difference is equal to or less than a predetermined threshold or not, when the value is not less than the threshold, calculating an adjacent relative pitch difference, and when the adjacent relative pitch difference is equal to or less than a previously set margin value, executing correction processing of adding or subtracting an octave of the current template relative pitch difference to calculate the relative pitch variation by applying the relative pitch difference as the relative pitch difference of the current analysis frame.

A pneumatic radial tire comprises a radial carcass, a belt, and a row of many blocks having different lengths along a circumference of a ground contact region under pitch variation defined in a tread rubber of the tread portion by at least two straight main grooves and a plurality of lateral sub-grooves extending between the mutual main grooves at an inclination angle of less than 90° with respect to the circumference of the ground contact region, in which the block row satisfies such relationships that an inclination angle phiL of an edge of a long-pitch block is larger than that phiS of an edge of a short-pitch block and an inclination angle alphaL of each block wall face of a long-pitch block is larger than that alphaS of each block wall face of a short-pitch block, or further an inclination angle betaS of a block wall face of a short-pitch block is larger than that betaL of a block wall face of a long-pitch block.

The invention provides a galloping preventing safety control method for a wind generating set, which particularly comprises the following steps: in case of troubles on the wind generating set, the master control system PLC ( programmable logic controller) of the wind generating set enters a stopping process; after stopping is judged or being under a PLC safe mode, a current transformer is started to enter into a safe mode, the safe mode of the current transformer can enable the current transformer to screen non-critical troubles and maintain the work of the wind generating set utmost, when the effective rotational speed of the wind turbine generator is higher than the starting rotational speed, the current transformer generates electricity and operates; and when the rotational speed of the wind turbine generator is not higher than the starting rotational speed, the current transformer is not in operation. According to the invention, the control link of the PLC safe mode is added, the safe grade of the control system of the wind generating set is enhanced greatly, and potential safety hazards caused by blower galloping due to incontrollable pitch variation are reduced greatly.

The present invention relates to an improvement to rotorcraft rotors (1) fitted with inter-blade drag dampers (15) such that for each blade (4), the two joints (16) connecting said blade (4) to two inter-blade drag dampers (15) are disposed on either side of the pitch variation axis (101) of said blade, at least one of the two joints (16) being offset to above the plane P containing the pitch variation axis (101) and the vertical flapping axis (102).

A star construction having variable pitch arms for a rotary molding machine for making plastic vessels and bottles, comprises a plurality of arms including gripper elements and a system including two levers which engages with the grippers, while cooperating with respective cam contours, the lever and cam system being reciprocatedly driven for providing a pitch variation and controlling the positions of the gripper elements.

With respect to prior solutions, the variable pitch arm star construction according to the invention allows to quickly and simply perform the operations necessary for modifying the arm pitch.

The present invention relates to a rotorcraft blade (1) provided with at least one spar (3) and an outer covering (4), said blade (1) including a hollow sleeve (10) with a wall (11) that is provided at least with said outer covering (4) secured to said spar (3). The blade includes a rotary damper (20) provided with an inner tubular strength member (21) and an outer tubular strength member (22) that are coaxial and connected together by a ring (23) of viscoelastic material, said inner tubular strength member (21) being secured to said covering (4), and said outer tubular strength member (22) being provided with a fork (25) possessing first and second tines (26, 27) facing each other so as to be suitable for receiving a first ball joint (41) close to the pitch-variation axis (AX1) of said blade (1).

The invention discloses a horizontal axis ocean current energy electric generator variable-pitch device and a horizontal axis ocean current energy electric generator. The variable-pitch device comprises a driving part which is a motor or a hydraulic motor, a screw rod which is fixedly connected with an output shaft of the driving part through a coupler and a push plate which is arranged on the screw rod in a sleeving mode and is in threaded connection with the screw rod. The left end of the screw rod is supported through a pair of centripetal thrust bearings. The right end of the screw rod extends into the left end of a central hole of a spindle flange and a spindle. A first sliding bearing is formed between the screw rod and the left end of the central hole of the spindle flange and the spindle. Electric slip rings or a hydraulic slip ring are/is mounted at the right end of the spindle. One gear rack is fixed to each side surface of the push plate, each gear rack is engaged with a gear wheel, all the gear wheels are fixedly connected with the roots of corresponding blades through variable-pitch flanges, and second sliding bearings are formed between the variable-pitch flanges and the wheel hub wall. An angle transducer is installed at the left end of the driving part. By means of the horizontal axis ocean current energy electric generator variable-pitch device and the horizontal axis ocean current energy electric generator, the variable-pitch angle larger than 180 degrees can be achieved, therefore, double-way electricity generation is achieved, unified pitch variation can be achieved, and operation is stable.

Provided is a pneumatic tire which achieves both reduction of pattern noise and improvement in driving stability on a dry road surface. The pneumatic tire according to the present invention is designed to be mounted in such a way that a designated side of the tire faces to the outside of a vehicle, and is characterized in that: multiple block elements arrayed in a circumferential direction of the tire are formed in each of regions sectioned by an equator of the tire in a tread portion of the tire, the regions on inner and outer sides; the number of pitches of the block elements on the vehicle inner side is set to 60 to 80; the number of pitch variations of the block elements on the vehicle inner side is set to at least 4; the number of pitches of block elements on the vehicle outer side is set to 50 to 70; the number of pitch variations of the block elements on the vehicle outer side is set to at least 4; the number of pitches of the block elements on the vehicle inner side is set larger than the number of pitches of the block elements on the vehicle outer side; and a ratio of an average pitch length of the block elements on the vehicle outer side to an average pitch length of the block elements on the vehicle inner side is set in a range of 1.05 to 1.20.

In a disk drive, a method for servo burst-decoding demodulation that accommodates track pitch variation. Depending on the distance a read head is displaced from a read head target position, a target-based blending scheme, a position-based blending scheme, or a weighted combination of both is used to determine the position of the transducer head. When the transducer head is relatively close to the target position, the target-based blending scheme is used to decode servo bursts and calculate the exact head position. When the transducer head is relatively far from the target position, the position-based blending scheme is used to decode servo bursts and calculate head position. When the transducer head is an intermediate distance from the target position, a weighted combination of the target-based and position-based blending schemes is used.

A method of forming a semiconductor device includes receiving a substrate with a plurality of gate structures; forming spacers on sidewalls of the gate structures; evaluating a pitch variation to the gate structures; determining an etch recipe according to the pitch variation; performing an etch process to source/drain regions associated with the gate structures using the etch recipe, thereby forming source/drain recesses with respective depths; and performing an epitaxy growth to form source/drain features in the source/drain recesses using a semiconductor material.

A rotor blade (1) with adaptive twisting, the blade being provided with an outer covering (2) extending along a pitch variation axis (AY) from a first end zone (3) to a second end zone (4), the outer covering (2) defining an internal cavity (8). The blade includes a strip (10) extending inside said cavity (8) along said pitch variation axis (AY), said strip (10) comprising a composite material that is anisotropic so as to be suitable for twisting under the effect of centrifugal forces (F) directed parallel to said pitch variation axis (AY) when the blade (1) is in rotation, said strip (10) being fastened to said outer covering (2) via first and second fastener means (11, 12) in order to be capable of twisting said outer covering (2).

The invention relates to a direct driving type hydraulic propeller-pitch variation control mechanism of a wind powered generator, which belongs to the technique field of wind power generating equipment. The invention provides the direct driving type hydraulic propeller-pitch variation control mechanism which comprises a closed type oil tank, an alternating current servo motor, a two-way constant rate pump, an oil supplementing valve, a hydraulic lock and a propeller-pitch variation hydraulic cylinder aiming at the problem of the complex hydraulic loop and the low reliability and the defect of no redundant control of a hydraulic propeller-pitch variation control mechanism of a prior wind powered generator. In addition, a power output shaft of the alternating current servo motor is connected with a power input shaft of the two-way constant rate pump which is connected with the propeller-pitch variation hydraulic cylinder through the hydraulic lock, the closed type loop is formed by two oil ways positioned between the two-way constant rate pump and the propeller-pitch variation hydraulic cylinder, two oil inlet and outlet openings of the oil supplementing valve are respectively connected with the two oil ways positioned between the two-way constant rate pump and the propeller-pitch variation hydraulic cylinder, and a third oil inlet and outlet opening of the oil supplementing valve is connected with an oil inlet and outlet opening of the closed type oil tank. The invention has the advantages of simple structure, reliable control, light weight, small floor area, and the like.

Provided is a pneumatic tire which employs pitch variation for suppressing pattern noise and has uniformity further improved. Pitches 3a, 3b and 3c with different pitch lengths are formed so that a pitch with a larger pitch length is set to have a smaller groove area ratio, and to have a larger groove wall angle α on the obtuse angle side that is formed by a groove wall of a lateral groove 2 and the direction tangential to the thread surface.

The invention provides an auxiliary control method and device for lowering the fan load under the gust condition and a fan controller, and relates to the technical field of wind power generation. Themethod includes the steps that whether gust occurs or not is judged according to rotating speed acceleration; when gust occurs, a pitch variation rate is calculated according to pneumatic resultant moment of a fan and pneumatic features of blades; and the blades are regulated according to the pitch variation rate. The rotating speed acceleration of the fan is selected as a threshold value variablefor judging occur of gust, thresholds under different wind speeds are obtained through comprehensive calculation according to operation power, a pitch angle and other variables of the fan, and thus the possibility of missed judging and erroneous judging can be reduced to the maximum extent. Meanwhile, the variation intensity of the speed of gust is represented by air moment, and thus output of apitch angle instruction is controlled according to the air moment; time delay is reduced in the control process, reaction is more sensitive, control is more timely and effective, the pitch angle control process for involving in or exiting normal power generation is smooth, and the influence on the pitch angle in normal operation is small.

Variation over time in fundamental frequency in singing voices is separated into a melody-dependent component and a phoneme-dependent component, modeled for each of the components and stored into a singing synthesizing database. In execution of singing synthesis, a pitch curve indicative of variation over time in fundamental frequency of the melody is synthesized in accordance with an arrangement of notes represented by a singing synthesizing score and the melody-dependent component, and the pitch curve is corrected, for each of pitch curve sections corresponding to phonemes constituting lyrics, using a phoneme-dependent component model corresponding to the phoneme. Such arrangements can accurately model a singing expression, unique to a singing person and appearing in a melody singing style of the person, while taking into account phoneme-dependent pitch variation, and thereby permits synthesis of singing voices that sound more natural.