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Mountable Printable Placard With Headband
A resilient headband in a shape for being mounted on the head of the user. The headband is equipped with a longitudinal slotted member for holding a placard.
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| Number | Title | Issue Date |
| 7642767 | Method and apparatus for measuring duty cycle Disclosed herein is a method and apparatus used to the measure duty cycle of a clocking waveform utilizing minimal hardware and achieving high accuracy. This invention utilizes digital sampling of the signal to be measured at a rate that can be significantly lower t... | 01/05/2010 |
| 7365527 | System and method for extending the range of a frequency measuring device A range of a frequency measuring device having limited range is extended by pre-processing an input signal. The input signal is divided into a plurality of channels. In each channel, the input signal is divided into sub-bands. A frequency of the input signal is dete... | 04/29/2008 |
| 7355537 | Built-in self-test apparatus and method for digital-to-analog converter A built-in self-test apparatus for a digital-to-analog converter uses a differentiation unit for differentiating a digital-to-analog (DA) signal to obtain the differences between pulses of the analog signal. Next, the analog signal is converted into a digital signal... | 04/08/2008 |
| 7352804 | Frequency estimation method and system A multiple linear regression frequency estimation method and system. A phase sequence of a received signal is derived and divided into several subsequences according to predetermined rules. The phase differences of the subsequences are calculated for frequency estim... | 04/01/2008 |
| 7266465 | Wideband digital IFM receiver with frequency confirmation An apparatus for confirming a frequency measurement of a received signal includes a discrete Fourier transform (DFT) module for receiving a sampled digital signal. The DFT module is configured to analyze the received sampled digital signal, and output amplitude valu... | 09/04/2007 |
| 7254502 | Method and device for detecting period length fluctuations of periodic signals To determine the period length of a first signal, the length is measured by counting the periods of a second signal with a shorter period length. To measure the fluctuations of the period length of the first signal whilst also taking into account the fluctuations of... | 08/07/2007 |
| 7236901 | Digital broadband frequency measurement The present invention relates to a device and method that digitally replicates the analog processing that is normally associated with an instantaneous frequency measurement device. Specifically, the present relates to a digital frequency measurement device comprisin... | 06/26/2007 |
| 7206707 | Wideband digital IFM receiver An IFM receiver includes a hybrid for outputting I and Q signals from a received input signal; a first ADC for digitizing the I signal to produce a first digital signal at a sampling rate of 1/τ, and a second ADC for digitizing the Q signal to produce a second digi... | 04/17/2007 |
| 7174279 | Test system with differential signal measurement A test system with easy to fabricate hardware to make measurements on differential signals. The two legs of a differential signal are applied to a comparator. A variable bias is introduced into the comparison operation. By taking multiple measurements with different... | 02/06/2007 |
| 7119717 | Encoder output divider and R/D converter A Resolver/Digital (R/D) converter includes an encoder output divider having a DSP generating 14-bit encoded signals A2 and B2 from a timing analysis performed during the first period of 12-bit encoded signal A1. The DSP generates a selection si... | 10/10/2006 |
| 7062164 | Detection of data transmission rates using passing frequency-selective filtering A data receiver, which could be an optical transceiver, a modem, a router hub, is capable of detecting the transmission rate of incoming data. The data is converted to electrical waves appropriate for passive or active bandpass filtering. The frequencies at which th... | 06/13/2006 |
| 7003413 | System and method of extraction of nonstationary sinusoids Signal processing techniques and systems and, in particular, an apparatus, system, algorithm and method of extraction of sinusoidal signals of time-varying nature is described. The apparatus, system, algorithm and method provide for extraction of a specified single ... | 02/21/2006 |
| 6965068 | System and method for estimating tones in an input signal A system and method for analyzing an input signal comprising one or more sinusoidal tones. A processor of the system receives samples of an input signal and operates on the samples to generate a transform array. The processor identifies positive frequency peaks of t... | 11/15/2005 |
| 6954709 | Signal processing circuit outputting a signal representing the number of times an input signal rises in a predetermined period as a signal corresponding to a quality of the input signal A signal processing circuit outputs a signal corresponding to a quality of a digitized input signal. An edge counter of the signal processing circuit counts the number of times the input signal rises and/or falls in a predetermined period. An output unit of the sign... | 10/11/2005 |
| 6917191 | Frequency measurement circuit A frequency measurement circuit measures a frequency of an input signal. The frequency measurement circuit includes a frequency measurement unit for counting a reference clock during a counting period having a predetermined number of waves of the input signal. The f... | 07/12/2005 |
| 6811291 | Detector for signals with harmonically related components A processor that utilizes the presence of harmonic components in a noisy signal environment to enhance the desired frequency spectrum of the signal. Received signal and noise are filtered to separate the harmonic components of the signal. These harmonic components a... | 11/02/2004 |
| 6771061 | High speed tester with narrow output pulses A tester that is well suited for operation at high speeds or with narrow pulses. The tester includes a state based pulse shaping circuit that combines edge signals into a pulsed output signal. The circuit combines groups of set and reset signals. The edge signals de... | 08/03/2004 |
| 6759838 | Phase-locked loop with dual-mode phase/frequency detection A phase-locked loop with dual-mode phase/frequency detection is provided. The phase-locked loop circuit includes a dual-mode phase/frequency detector, a loop filter, a voltage-controlled oscillator, and a frequency converter. In addition, the dual-mode phase/frequen... | 07/06/2004 |
| 6624623 | Method and apparatus for digitally measuring the frequency of a signal by integration of its signal phase In a method and apparatus for measuring the frequency of a signal by integration of its signal phase, a phase accumulator integrates the signal phase of the signal, at predetermined time intervals. A first intermediate memory reads in a first output value... | 09/23/2003 |
| 6574168 | Time measuring device and testing apparatus A time measuring device includes: an input signal detecting unit for detecting three or more edges in an input signal and to output three or more detection signals in parallel, the three or more detection signals changing based on the three or more edges,... | 06/03/2003 |
| 6486805 | Frequency to digital converter According to an embodiment of the present invention, an input signal is provided to an oscillator, which creates a count signal with a greater frequency than the input signal. The input signal triggers the oscillator to oscillate depending on the value of... | 11/26/2002 |
| 6448757 | Precise digital frequency detection A digital frequency detector (10) and method for digitally detecting arbitrarily small phase changes between a signal waveform and a reference waveform. Both the reference waveform and the signal waveform are sampled at a rate related to the clock frequen... | 09/10/2002 |
| 6426634 | Circuit breaker with integrated self-test enhancements A circuit switching device or circuit breaker with integrated self-test enhancements is disclosed having separable contacts operable under processor control to control power to a circuit responsive to at least one of a plurality of fault conditions and op... | 07/30/2002 |
| 6291981 | Automatic test equipment with narrow output pulses Automatic test equipment suitable for testing high speed semiconductor devices. The test equipment includes a formatter circuit with a flip flop that produces an output in the desired format even if the edge signals that control the setting and resetting ... | 09/18/2001 |
| 6233529 | Frequency spectrum analyzer having time domain analysis function A spectrum analyzer is provided with a continuous period measurement function which continuously measures time periods of each and every cycle of an IF signal to analyze changes in frequency and time period of an input signal in a time domain. The frequen... | 05/15/2001 |
| 6115675 | Double interpolation anti-skew compensation of sampled analog data points in a protective relay A protective relay system comprises current and voltage transducers 10, filters 12, and a multiplexor 14, the latter outputting an interleaved stream of analog phase current and voltage signal samples, as well as neutral current samples. The analog multip... | 09/05/2000 |
| 6026418 | Frequency measurement method and associated apparatus The frequency measurement method and associated apparatus accurately determines the frequency of a periodic signal even if the frequency exceeds the nyquist frequency, typically established by the analog to digital ("A/D") converter used to sample the sig... | 02/15/2000 |
| 5845232 | Apparatus and method for detecting splice overlaps or splice gaps in a tire An apparatus and related method for detecting splice gaps and splice overlaps includes a processor having a memory and a plurality of logic tables, wherein the processor is connected to an input/output terminal, a probe, an encoder and a motor which rotat... | 12/01/1998 |
| 5832413 | Generator protection system and method for phasor estimation and frequency tracking during frequency ramping A method for estimating phasors and tracking the frequency of a signal during frequency ramping is provided. The method uses a variable N-point DFT periodically to compute one or more phasors based on data acquired from one or more sampled signals. The pe... | 11/03/1998 |
| 5832414 | Generator protection system and method of compensating for errors in phasor estimation due to oscillations in discrete Fourier transform A new method of compensating for errors in phasor estimation due to oscillations caused by discrete fourier transforms used to estimate signal frequency is provided. The method uses a variable N-point DFT to compute one or more phasors based on data acqui... | 11/03/1998 |
| 5808895 | Method and apparatus for low signal to noise ratio instantaneous phase measurement The system and method of the present invention generates high resolution phase measurements without the high processing and memory overhead requirements found in prior art circuits and methods. Each signal sample (of N samples) is divided further into J s... | 09/15/1998 |
| 5471133 | Digital device for measuring the frequency of an electrical signal In order to permit rapid, high-resolution measurement of the frequency of an electrical signal using a digital device, the electrical signal is fed to two linear-phase non-recursive digital filters (3, 20) with symmetrically distributed filter coefficient... | 11/28/1995 |
| 5440228 | Simultaneous signals IFM receiver using plural delay line correlators A simultaneous signals frequency measurement receiver comprising a number n of delay line correlators, with a complete set of n, delays, a number 2n of digitizers, computational means to define an m×m matrix R, to calculate the mathematically defined eig... | 08/08/1995 |
| 5420501 | Frequency spectrum analyzer A frequency spectrum analyzer wherein an input signal is subjected to A/D conversion, and the converted data is multiplied by a window function; and the thus processed signal is subjected to Discrete Fourier Transform; when a user specifies a desired freq... | 05/30/1995 |
| 5359533 | Method for determining a frequency/time profile of hits, and device for carrying out the method In a method for determining a frequency/time profile of hit sequences and the corresponding device, a measuring window is opened after an external starting signal has been locked. As long as the measuring window is open, the clock periods are counted. If ... | 10/25/1994 |
| 5357196 | Circuit for converting a frequency of an input signal so a signal having a digital value corresponding to the frequency A measuring circuit with a simple circuit configuration is capable of correcting dispersion of a characteristic of a display apparatus and of displaying the measurement result. The measuring circuit comprises an edge detecting circuit, for outputting an e... | 10/18/1994 |
| 5329468 | Actual operating time indicator An actual operating time indicator includes: a lifting motor for lifting a load up/down; a power detection unit for detecting an input power based on a current and a voltage supplied to the motor, and converting the input power into a first voltage propor... | 07/12/1994 |
| 5325049 | Frequency deviation measuring apparatus Based on a desired center frequency and a frequency resolution for a signal to be measured which are entered via an operator section, a micro-CPU calculates the frequency dividing number, a preset value and a center value for the signal to be measured. Th... | 06/28/1994 |
| 5245311 | Logical comparison circuit for an IC tester In the case of setting one comparison timing in one operation period, a select signal is set to the "0" level, by which first, second and third counters are each put in the state of operation of a 1-to-4 frequency dividing counter which produces four freq... | 09/14/1993 |
| 5235287 | Frequency measurement receiver with bandwidth improvement through phase shifted sampling of real signals using sampling rate selection This is a technique for extending the frequency range which employs a power divider having two outputs, one output being supplied to a first A/D converter, and the other output being supplied via a delay device to a second A/D converter. A processor recei... | 08/10/1993 |
