摘要:
The invention relates to a composition comprising a modified, random copolyetherester containing a modified, random polytrimethylene terephthalate copolymer block that is derived from a polyethylene terephthalate component selected from the group consisting of polyethylene terephthalate and polyethylene terephthalate copolymers and combinations thereof; and contains at least one residue derived from the polyethylene terephthalate component; and a polyalkylene oxide copolymer block that contains polyalkylene oxide and at least one residue derived from the polyethylene terephthalate component. The composition has a modulus of elasticity that is at least 80%, as compared to the modulus of elasticity of a copolyetherester derived from (1) polytrimethylene terephthalate derived from a monomer component selected from the group consisting of terephthalic acid, isophthalic acid, alkyl esters of terephthalic acid, hydroxyalkyl esters of terephthalic acid, alkyl esters of isophthalic acid, 1,3-propane diol, (2) polyalkylene oxide glycol, and (3) combinations thereof.
摘要:
A composition comprising a polytrimethylene terephthalate random copolymer that (1) is derived from polyethylene terephthalate component selected from the group consisting of polyethylene terephthalate and polyethylene terephthalate copolymers and (2) contains at least one residue derived from the polyethylene terephthalate component. Methods for making such copolymers and articles made from such copolymers.
摘要:
The invention relates to a composition comprising a modified, random copolyetherester containing a modified, random polybutylene terephthalate copolymer block that is derived from a polyethylene terephthalate component selected from the group consisting of polyethylene terephthalate and polyethylene terephthalate copolymers and combinations thereof; and contains at least one residue derived from the polyethylene terephthalate component; and a polyalkylene oxide copolymer block that contains polyalkylene oxide and at least one residue derived from the polyethylene terephthalate component. The composition has a modulus of elasticity that is at least 80%, as compared to the modulus of elasticity of a copolyetherester derived from (1) polybutylene terephthalate derived from a monomer component selected from the group consisting of terephthalic acid, isophthalic acid, alkyl esters of terephthalic acid, hydroxyalkyl esters of terephthalic acid, alkyl esters of isophthalic acid, 1,4-butanediol, (2) polyalkylene oxide glycol, and (3) combinations thereof.
摘要:
A system for converting digital signals into analog signals using sigma-delta modulation and includes a signed thermometer encoder for converting a plurality of signed binary data received at the encoder into a plurality of signed thermometer data and a rotational dynamic element matching (DEM) arrangement for receiving the plurality of signed binary data and the plurality of signed thermometer data. The rotational DEM arrangement further includes a first barrel shifter for receiving a positive thermometer data at a cycle, the first barrel shifter having a first pointer indicating a starting position of next positive thermometer data, and a second barrel shifter for receiving a negative thermometer data at a cycle, the second shifter having a second pointer indicating a starting position of next negative thermometer data, wherein the first pointer is circularly shifted as a function of positive binary data and the second pointer is circularly shifted as a function of negative binary data.
摘要:
A digital timing read back and an adaptive feedforward compensation algorithm to reduce harmonic distortion is disclosed. More specifically, the approach generates harmonic components digitally with the same magnitude but at an opposite phase to the output harmonic distortion. An anti-distortion signal is generated and added to the input signal. The magnitude and phase of the harmonic distortion change with the modulation level or index and the frequency of the input signal. In addition, the harmonic distortion level varies significantly with different timing error statistics in different power devices. The inventive method takes the modulation level or index, the frequency of the input signal and the timing error statistics acquired through a digital read back circuit as input variables to determine the magnitude and phase of the anti-distortion signal.
摘要:
A switching amplifier system and method is disclosed. In a particular embodiment, a pulse width modulation frame size is determined based on a sample rate of a digital input signal. Data associated with the first digital input signal is modified based on the pulse width modulation frame size. A pulse width modulation signal is generated in response to the modified data.
摘要:
The invention relates to a composition comprising a modified, random copolyetherester containing a modified, random polybutylene terephthalate copolymer block that is derived from a polyethylene terephthalate component selected from the group consisting of polyethylene terephthalate and polyethylene terephthalate copolymers and combinations thereof; and contains at least one residue derived from the polyethylene terephthalate component; and a polyalkylene oxide copolymer block that is derived from a polyethylene terephthalate component and polyalkylene oxide glycol, and contains polyalkylene oxide and at least one residue derived from the polyethylene terephthalate component. Advantageously, the composition has a modulus of elasticity that is at least 80%, as compared to the modulus of elasticity of a copolyetherester derived from (1) polybutylene terephthalate derived from a monomer component selected from the group consisting of terephthalic acid, isophthalic acid, alkyl esters of terephthalic acid, hydroalkyl esters of terephthalic acid, alkyl esters of isophthalic acid, 1, 4-butanediol, (2) polyalkylene oxide glycol, and (3) combinations thereof. The invention also relates to articles made from the composition, methods of making the composition. The invention also relates to copolyetherester containing: a modified, random polytrimethylene terephthalate copolymer blocks, articles made from the compositions, and methods for making such materials.
摘要:
An audio signal processing system and method is disclosed. In a particular embodiment, the audio signal processing system includes a first electrical path responsive to a power supply of an audio amplifier. The first electrical path can include a low pass filter to filter a direct current (DC) component of the power supply and a first analog-to-digital converter (ADC) responsive to the low pass filter. The audio signal processing system also includes a second electrical path responsive to the power supply. The second electrical path can include a high pass filter to filter an alternating current (AC) component of the power supply and a second ADC responsive to an output of the high pass filter. The audio signal processing system includes compensation logic to modify an audio signal based on a first signal generated from the first electrical path and a second signal generated from the second electrical path.
摘要:
Systems and method to compress digital video based on human factors expressed as a desirability score are provided. A particular method includes passing a digital input signal through a pulse-width modulator and passing an output of the pulse-width modulator through a power switching device. An output of the power switching device has a plurality of pulses. The method includes receiving the output of the power switching device at a first input of a comparator and receiving a reference voltage at a second input of the comparator. The method includes determining a net signal based on an output of the comparator and determining a timing error signal based on the net signal and the digital input signal. The method also includes adjusting the digital input signal to compensate for harmonic distortion based at least in part on the timing error signal.
摘要:
A system for converting digital signals into analog signals using sigma-delta modulation and includes a signed thermometer encoder for converting a plurality of signed binary data received at the encoder into a plurality of signed thermometer data and a rotational dynamic element matching (DEM) arrangement for receiving the plurality of signed binary data and the plurality of signed thermometer data. The rotational DEM arrangement further includes a first barrel shifter for receiving a positive thermometer data at a cycle, the first barrel shifter having a first pointer indicating a starting position of next positive thermometer data, and a second barrel shifter for receiving a negative thermometer data at a cycle, the second shifter having a second pointer indicating a starting position of next negative thermometer data, wherein the first pointer is circularly shifted as a function of positive binary data and the second pointer is circularly shifted as a function of negative binary data.