摘要:
A waveform conversion unit (42) of a numerically controlled oscillator has a cosine table (101) and a sine table (102) in which parameters for cosine wave and sine wave signal generation are stored, a correction mechanism (50) for generating correction values according to the phase of an inputted phase signal, an adder (111) for generating a cosine wave signal from a parameter in the cosine table (101) and a correction value, and an adder (112) for generating a sine wave signal from a parameter in the sine table (102) and a correction value. The correction mechanism (50) uses waveform data which is a kind of parabolic data and whose phase interval is more minute than the phase interval of the parameters in each table (101), (102) to generate correction values for correcting cosine wave and sine wave signals to be found by linear interpolation.
摘要:
A waveform conversion unit (42) of a numerically controlled oscillator has a cosine table (101) and a sine table (102) in which parameters for cosine wave and sine wave signal generation are stored, a correction mechanism (50) for generating correction values according to the phase of an inputted phase signal, an adder (111) for generating a cosine wave signal from a parameter in the cosine table (101) and a correction value, and an adder (112) for generating a sine wave signal from a parameter in the sine table (102) and a correction value. The correction mechanism (50) uses waveform data which is a kind of parabolic data and whose phase interval is more minute than the phase interval of the parameters in each table (101), (102) to generate correction values for correcting cosine wave and sine wave signals to be found by linear interpolation.
摘要:
A linear interpolator is provided that includes differential pairs of transistors biased such that a first input voltage may be multiplied by a factor r wherein 0≦r≦1 and such that a second input voltage may be multiplied by the complement factor (1−r). By combining the multiplied input voltages, a linear interpolation is provided based upon the factor r.
摘要:
A linear interpolator is provided that includes differential pairs of transistors biased such that a first input voltage may be multiplied by a factor r wherein 0≦r≦1 and such that a second input voltage may be multiplied by the complement factor (1-r). By combining the multiplied input voltages, a linear interpolation is provided based upon the factor r.
摘要:
A linear interpolator comprising an amplifier, an integrator for integrating an output of the amplifier, a feedback circuit connected between the amplifier and the integrator for bootstrapping an input voltage of the amplifier by an output voltage from the integrator, and a switch for periodically supplying a staircase input signal to the amplifier. A linearly interpolated output is derived from the integrator. The discrete input signal changing stepwise can be linearly interpolated with high accuracy.
摘要:
Apparatus receiving step voltage inputs provides an output voltage that moves as a linear ramp from step to step. Each new input causes an amplifying circuit to connect a predetermined potential to an integrator, starting a new ramp. A comparator circuit receives voltages proportional respectively to the input and the ramp output, and when they become equal it stops the ramp. An inverter is automatically connected into the amplifying circuit when needed to change the polarity of the potential to the integrator, and thus to reverse the direction of the ramp. Manual and automatic adjusting and switching means control the operating sequences and parameters.