A synthesizer that has a phase detector 8 and a charge pump circuit 9 for injecting an electric charge, or pulling it out that corresponded to a frequency difference of an input, a low-pass filter 11 for converting this electric charge into a voltage, a voltage control oscillator (VCO) 13 for changing an output frequency for this input voltage, a divider 14 for dividing the frequency of the input, and a voltage holding circuit 10 for holding the input voltage for a plurality of output frequencie...

A synthesizer comprises a detector for detecting a parameter difference, a voltage controlled oscillator, at least one capacitor having one end connected to a node between the detector and the voltage controlled oscillator and means connected to an other end of the at least one capacitor for providing an electrical response in dependence on the detected parameter difference.

A synthesizer that has a phase detector 8 and a charge pump circuit 9 for injecting an electric charge, or pulling it out that corresponded to a frequency difference of an input, a low-pass filter 11 for converting this electric charge into a voltage, a voltage control oscillator (VCO) 13 for changing an output frequency for this input voltage, a divider 14 for dividing the frequency of the input, and a voltage holding circuit 10 for holding the input voltage for a plurality of output frequencie...

The synthesizer uses phase lock loop techniques to generate either the carrier signal for an associated transmitter or the injection signal for an associated receiver. A programmable divider controls the specific channel to which the synthesizer tunes the transmitter or receiver whereas operation in the transmit or receive mode is dependent upon which of two oscillators is coupled in the synthesizer circuit. The oscillators are designed to run at two frequencies having a difference equal to the ...

The present invention is a method and system for processing communication signals in a wireless telecommunication system having at least two subscriber units. The subscriber units communicate with each other through a selected band of radio frequencies over a plurality of radio frequency channels. The system generates a fixed based radio frequency signal and a digital intermediate frequency signal. The fixed based radio frequency signal and the digital intermediate frequency signal are then comb...

A frequency synthesizer for use in a high-frequency multichannel radio apparatus and so on. More particularly, a phase-locked loop (PLL) type frequency synthesizer which can perform a pulling process at high speed. Namely, a frequency synthesizer of the present invention can effect a pulling process at high speed by putting input signals to a phase comparator into a state in which the input signals are in phase with each other in an intermittent operation mode and can have strong resistance to n...

An eigenvector synthesizer is provided for producing a wide range of musical sounds using a subset of eigenvectors of related sounds. The waveshapes of the eigenvectors can be scaled and summed to provide an accurate reproduction of the related sounds. With an astute selection of related sounds, an accurate reproduction of a wide range of musical sounds can be provided with a minimum amount of memory and a minimum number of calculations.

A signal waveform synthesizer system is disclosed as containing a digital put decade counter, a four to 10 line decoder and a flip-flop operatively connected to said decade counter. Said decoder has the 10 outputs thereof interconnected and grounded, respectively, and connected to a voltage divider network for producing consecutive output voltages in such manner as to generate a predetermined first half-cycle analog waveform. A direct current blocking capacitor allows the aforesaid flip-flop to ...

A phase locked loop type of frequency synthesizer to generate simultaneously N output signals each having a different one of N different frequencies, where N is an integer greater than one, includes N voltage controlled oscillators each capable of generating simultaneously a different one of the N output signals and the major components of a single phase locked loop employed by each of the voltage controlled oscillators at different times. For each voltage controlled oscillator, a set of switche...

A voice synthesizer of the type set forth in U.S. Pat. No. 3,836,717 wherein the control signals applied to the devices in the vocal track model take the form of variable pulse width "duty cycle" waveforms. A novel system for producing the duty cycle signals is disclosed. Variable speech rate is provided.