| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 332109000 |
Pulse width modulator
| 85 |
| 332108000 |
Plural modulation
| 12 |
| 332115000 |
Pulse amplitude modulator
| 6 |
| 332107000 |
Including stabilization or alternatively distortion, noise or other interference prevention, reduction or compensation | 4 |
| 20100207699 | System and Method of Shaping a Power Spectrum in PWM Amplifiers - In a particular embodiment, a circuit device is disclosed that includes a data generator adapted to output a random pulse sequence having a particular spectral shape. The circuit device further includes a pulse edge control circuit to selectively apply a carrier suppression operation to at least one pulse-width modulated (PWM) signal in response to the random pulse sequence to produce at least one modulated PWM output signal. The spectral energy associated with a PWM carrier of the modulated PWM output signal at a carrier frequency and associated harmonics is changed such that the modulated PWM output signal has a spectral shape defined by the particular spectral shape. | 08-19-2010 |
| 20160065177 | DEVICES AND METHODS FOR CONVERTING DIGITAL SIGNALS - A signal converter directly converts pulse-density-modulated (PDM) signals into pulse-width-modulated (PWM) signals. A noise-shaping loop architecture can be configured to apply a signal transfer function having a low-pass filter effect, and a noise transfer function having a high-pass filter effect. Decimation and interpolation can ensure that the noise-shaping loop architecture operates at a first sampling frequency, while the PWM modulator operates at a second, higher sampling frequency. | 03-03-2016 |
| 20160065178 | DEVICES AND METHODS FOR PULSE-WIDTH MODULATION - Devices and methods convert signals into pulse-width modulated signals. A noise-shaping loop can be clocked at a lower frequency than a PWM modulator, resulting in lower power requirements, and greater ease of synchronization. The delay introduced by the noise-shaping loop can be reduced by implementations using sample-and-hold devices, look-up tables and logic circuitry to predict output signals. | 03-03-2016 |
| 20170237420 | System and Method for Modulation and Demodulation | 08-17-2017 |
| 332112000 |
Pulse position, frequency, phase, or spacing modulator | 3 |
| 20090134948 | PULSE MODULATION METHOD - A pulse modulation method divides code comprising 4N-bit data into 2-bit units of data. For each pulse signal having a fixed pulse width tw, a code modulated signal is generated by pausing between pulse pause intervals Tr. An adjusted time width of between ½ and 1 times the fixed pulse width tw is taken to be Δt. One of time widths 0, Δt, 2Δt, and 3Δt is added to a fixed pause period tm of time intervals according to a corresponding value of the 2-bit data. If the sum total time TD of the code modulated signal is an interval of at least [(2tw+2tm+3Δt)N+Δt], each pulse pause interval Tr is substituted by a pulse pause interval Tr corresponding to the inverted 2-bit data. An inversion flag signal expresses that inversion information is added to the code modulated signal. | 05-28-2009 |
| 20100244974 | METHOD AND APPARATUS FOR PULSE POSITION MODULATION - A method for reducing the transition rate of a pulse width modulated signal representing an original signal, and thus reducing energy losses of devices such as class D amplifiers stimulated by the signal, while decreasing the jitter and thus the SNR of the output low passed signal. Within the method every R pulses of a signal having a frame duration of M, are summed to receive frames of R*M duration having a single pulse. Then, the odd pulses are mirrored within their respective time frames, so that each odd pulse is attached to the following even pulse. The combined pulse, which occurs in a window having a duration of 2*R*M is then optionally re-positioned within its time frame. The repositioning can be designed so as to position the pulse within the 2*R*M window, having the same moment as the original signal, or to receive a signal having the same phase of the Fourier transform as the original signal, at least for the frequency range of interest of the original signal, such as the low frequencies. Other aspects, features, and embodiments are also claimed and described. | 09-30-2010 |
| 20130127557 | SYSTEM AND METHOD OF MAINTAINING GAIN LINEARITY OF VARIABLE FREQUENCY MODULATOR - A variable frequency modulator including a compensation network, first and second pulse control networks and a linearity controller. The compensation network is configured to provide a compensation signal indicative of an output load condition. The first pulse control network is configured to initiate pulses on a pulse control signal and to adjust operating frequency based on changes of the compensation signal. The second pulse control network is configured to terminate the pulses on the pulse control signal based on a predetermined timing parameter. The linearity controller is configured to adjust timing of terminating the pulses based on a predetermined steady state operating frequency and an actual operating frequency to maintain modulator gain at a constant level. | 05-23-2013 |
| Entries |
| Document | Title | Date |
|---|
| 20100271148 | SIGNAL MODULATOR - A signal modulator that can control transmission power if level adjustment of a continuous signal from an oscillator is executed is provided. A pulse generator of one example of a signal modulator includes an oscillator, a control signal generator, a multiplier, a filter, and a control section. The oscillator and the multiplier are active circuits formed of active elements. A continuous signal is output from the oscillator and is input to the multiplier and the multiplier intermittently operates by a control signal output from the control signal generator, whereby a pulse signal is generated and the power level is easily adjusted by a signal from the control section. | 10-28-2010 |
| 20110221540 | PULSE DENSITY MODULATION METHOD AND APPARATUS - A pulse density modulation, PDM, driver, outputs a PDM stream and can be switched to a control token. The switch takes place when the first integral of the PDM stream has a magnitude less than or equal to a first predetermined value and the second integral of the PDM stream has a magnitude less than or equal to a second predetermined value. | 09-15-2011 |
| 20120194288 | Two-Terminal Modulator - The invention is an electronic Two-Terminal Modulator. It is used electrically in series between a Power Source and a Target Device, and can modulate the power that is sent to the Target Device, at speeds and with modulating complexity that exceed present capability. The invention includes implementation of the modulator as a unit that is inserted into or appended to another device and is used to modulate the power in the other device. | 08-02-2012 |
| 20130127556 | POWER SUPPLY MODULATOR AND METHOD FOR CONTROLLING SAME - A power amplifier amplifies a radio signal. Negative feedback is applied to a linear amplifier and the linear amplifier receives an envelope signal. A pulse current modulator is connected to a power supply terminal of a power amplifier and an output terminal of the linear amplifier via an inductor, and outputs a pulse current according to a control signal generated from the envelope signal. A diode has an anode connected to an output terminal of a direct current source and a cathode connected to an output terminal of the pulse current modulator. A switching element is disposed between the output terminal of the direct current source and a ground potential, and is controlled by the control signal. | 05-23-2013 |
