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Class 235/462.26 - Amplitude control (e.g., automatic gain control)


Subclass of Class 235 - Registers
Definition: Subject matter including a circuit element to control the
No. of patents: 74
Last issue date: 10/04/2011


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NumberTitleIssue Date
8028917Adaptive optimizations for signal processing in imaging readers
An imaging reader includes an illuminating light assembly, an illuminating control operative to control either the intensity or the duration of the illumination light projected by the illuminating light assembly, and a solid-state imager. The solid-state imager incl...
10/04/2011
7832644Barcode scanner with linear automatic gain control (AGC), modulation transfer function detector, and selectable noise filter
According to embodiments of the present invention, a barcode scanner platform is provided in which the gain of an analog signal representative of a barcode is controlled using a control loop. In embodiments, an MTF detector generates a value (e.g., DC) representativ...
11/16/2010
7743993Barcode scanner with linear automatic gain control (AGC), modulation transfer function detector, and selectable noise filter
According to embodiments of the present invention, a barcode scanner platform is provided in which the gain of an analog signal representative of a barcode is controlled using a control loop. In embodiments, an MTF detector generates a value (e.g., DC) representativ...
06/29/2010
7690575Imaging reader with adaptive illumination and adaptive resolution
Infrared light having a wavelength in a range from about 700 nm to about 760 nm, which is non-readily visible, illuminates indicia to be electro-optically read by default. Blue visible light having a wavelength in a range from about 430 nm to about 505 nm illuminate...
04/06/2010
7380721Low-cost compact bar code sensor
A barcode sensor package has an optical emitter circuit and an optical detector circuit which are formed as one or more integrated optical circuits disposed in a housing which has a reading surface and one or more apertures located between the optical emitter and de...
06/03/2008
7366489Mobile communication apparatus
A transceiver suitable for larger scale of integration employs direct conversion reception for reducing the number of filters. Also, the number of VCOs is reduced by utilizing dividers to supply a receiver and a transmitter with locally oscillated signals at an RF b...
04/29/2008
7331523Adaptive optical image reader
There is described in one embodiment a method for use by an apparatus that can acquire an image. According to a described method, parameters for utilization by the apparatus are provided. According to a described method, a method can include acquiring an image and c...
02/19/2008
7306154Barcode scanning system with a compensation circuit
A barcode scanning system is provided, which comprises an amplitude compensation circuit to change the amplitude of signals corresponding to each location on the barcode such that all the signals have the same amplitude. The changing of the amplitude may be determin...
12/11/2007
7304969Automatic gain control and low power start-of-packet detection for a wireless LAN receiver
A digital AGC system for burst operation, particularly suited for receiving packets in a wireless local area network. One embodiment includes a log detector that provides a signal strength measure, called the received signal strength indication (RSSI) over a wide dy...
12/04/2007
7278577Image input system
An image input system includes a solid state image pickup device and a preprocessor for performing correlated double sampling amplification on an output of the image pickup device and outputting a video signal. The preprocessor has a correlated double sampling ampli...
10/09/2007
7264165Method for reading a graphic pattern and acquiring its image
A method for reading a graphic pattern by illuminating the graphic pattern with at least two groups of light sources, each of the at least two groups of light sources having at least one light source operating according to an illumination cycle that comprises an ill...
09/04/2007
7227117High speed auto-exposure control
An imager with a two dimensional array of sensors processes illumination data from a subset of the sensors located within a selected region of the image to determine imager settings prior to acting upon a full frame of data. In this manner imager settings can be qui...
06/05/2007
7216811Barcode scanner with linear automatic gain control (AGC), modulation transfer function detector, and selectable noise filter
According to embodiments of the present invention, a barcode scanner platform is provided in which the gain of an analog signal representative of a barcode is controlled using a control loop. In embodiments, an MTF detector generates a value (e.g., DC) representativ...
05/15/2007
7215239Non-contact smart card interrogator, wherein across a transmission line from an antenna to a receiver the signal modulation varies between amplitude modulation and phase modulation
In a non-contacting smart card interrogator (1) a first end (A) of an eighth-wave transmission line (13) is connected to a terminal connecting a first receiver (16) to a transmission line (14), and to a second end (B) of the transmission ...
05/08/2007
7204422System, circuit, and method for edge detection in a binary optical code
Systems process an input signal, derived from a binary optical code, having a series of multiple successive local peaks of the same given polarity. The circuit comprises a peak detector, a node in the peak detector, and a set-reset flip-flop. The peak detector has a...
04/17/2007
7172125Gain control system and method for use in electro-optical readers
An intelligent gain selection circuit replaces the gain set by an automatic gain control circuit in an electro-optical reader for reading indicia, such as bar code symbols, with a larger gain where specular reflections, high contrast edges, or other noise operative ...
02/06/2007
7158057Circuitry and methods for high speed data encoding
An unpartitioned high-speed 8B/10B encoder and corresponding methods use only one edge or level of the clock signal per clock cycle to encode a set of 8B to a corresponding set of 10B data, and thus is not limited to a 50% clock duty cycle. The encoder includes an u...
01/02/2007
7152800Preamplifier system having programmable resistance
A biasing scheme is disclosed that helps reduce current noise in an associated device, such as, for example, a magneto-resistive device. The biasing scheme provides for setting a resistance path in a preamplifier, which is operative to energize the associated device...
12/26/2006
7151759Automatic gain control and low power start-of-packet detection for a wireless LAN receiver
A digital AGC system for burst operation, particularly suited for receiving packets in a wireless local area network. One embodiment includes a log detector that provides a signal strength measure, called the received signal strength indication (RSSI) over a wide dy...
12/19/2006
7143948Reading method of the two-dimensional bar code
A two-dimensional bar code printed on a piece of paper is photographed by the area sensor. A reading method of this bar code includes a process for correcting the distortion of the image of the two-dimensional bar code obtained from the area sensor by the projection...
12/05/2006
7140545Optical reading device and portable communication equipment having the optical reading device
An optical reading device optically reads information on a surface. The optical reading device includes a contact detection unit, a reading unit, and a signal processing unit. The contact detection unit provides a signal when the optical reading device is within a t...
11/28/2006
7133178Image forming apparatus and image forming method
A printer has a laser emitter for emitting a laser beam to irradiate a surface of a photosensitive member; a reflector for reflecting the laser beam to a target position on the photosensitive member; a driver for moving the reflector; a resolution changeover designa...
11/07/2006
7123671Automatic gain control method for digital subscriber line modems
The present invention provides automatic gain control (AGC) for a wide variety of conditions encountered in DSL scenarios. In particular, the proposed AGC approach addresses the problem of analog front end saturation in which a plurality of gain stages (i.e., progra...
10/17/2006
7077323Bar code recognizing method and decoding apparatus for bar code recognition
A bar code is scanned and a line of image data is extracted in a process. The line of extracted image is divided into patterns forming characters in a process. The divided patterns are converted into characters in a process. In the process, a pattern is divided by t...
07/18/2006
7042285RF power amplifier with load insensitive indirect forward power detector
A power amplifier circuit includes an adjustable gain power amplifier for amplifying an RF input signal. An isolated node in the adjustable gain power amplifier is isolated from the output load by a gain stage of the adjustable gain power amplifier. The power level ...
05/09/2006
7035351Automatic gain control loop apparatus
A DC offset cancelling circuit with multiple feedback loops suppresses DC offset voltages within an automatic gain control loop apparatus. The apparatus includes a plurality of gain stages connected in series that receive and amplify an input RF signal. Each gain st...
04/25/2006
7025273Miniature auto focus voice coil actuator system
Actuator systems are provided for automatically focusing an optical image reader. Techniques are also provided which are applicable to the design of imaging engines and imaging lens systems associated with image readers of various types. More specifically, the prese...
04/11/2006
7025267Method for reading a graphic pattern and acquiring its image
A method for reading a graphic pattern by illuminating the graphic pattern with at least two groups of light sources, each of the at least two groups of light sources having at least one light source operating according to an illumination cycle that comprises an ill...
04/11/2006
7021546Bar-code reader and method of reading bar-code
In a bar-code generally number of modules corresponding to each character is seven. However, if the number of modules judged from the data obtained by reading a bar code is, for example, six, the character is demodulated using a demodulation-pattern table correspond...
04/04/2006
6969003Method and apparatus for extending operating range of bar code scanner
Briefly stated, the operating depth of field for a bar code scanner, preferably a laser scanner, is increased by placing a cubic phase mask (CPM) in the scanning beam. The masked beam is then scanned and reflected off a bar code and received by a photodetector. The ...
11/29/2005
6948662Two-dimensional optical code scanner with scanning pattern having region of greater apparent brightness for assisting alignment of scanning pattern
An alignment indication is provided in an optical scanner for reading a two-dimensional optical code by varying the scanning beam to provide a region of apparent greater brightness. In the case of a PDF417 bar code symbol, an elongated brighter region may be oriente...
09/27/2005
6871785Method and device for compensating undesired variations in an electrical signal generated by an optical code reader
The method for compensating undesired variations in an electrical signal generated by a sensor of an optical code reader comprises the steps of generating an envelope signal starting from the electrical signal generated by the sensor and normalizing the electrical s...
03/29/2005
6866198Imaging bar code reader with moving beam simulation
The operating environment of a moving laser beam in a flying spot, electro-optical reader is simulated in a solid-state, sensor-based imaging reader by turning a visible line produced by a light emitting diode on and off prior to capturing a two-dimensional image of...
03/15/2005
6811087Barcode scanner
A barcode scanner comprising a laser driving circuit to drive a laser by a pulse signal generated by an oscillator, a preamplifier to amplify a voltage of a barcode signal from a photodetector corresponding to a reflected light from a barcode scanned by a light outp...
11/02/2004
6607129Optical scanner and image forming apparatus
An optical scanner to be used for an image forming apparatus such as a digital copying machine includes a light source, such as a semiconductor laser, for emitting a light beam; a deflection element, such as a rotary polygon mirror, for deflecting the emi...
08/19/2003
6607131Reading method and reader for an optical code
Reading method for an optical code using a reader which comprises photoemitters, photoreceivers and a processor circuit, in which the following steps are carried out: emitting radiation toward the exterior of the reader; detecting the presence of at least...
08/19/2003
6601767Ambient light sensing apparatus and method for a produce data collector
An ambient light sensing apparatus and method for a produce data collector which minimize false triggering of produce data collection. The apparatus includes an image capture device which has a first receiving angle for incident light through an aperture ...
08/05/2003
6547139Method and apparatus for extending operating range of bar code scanner
The operating depth of field for a bar code scanner, preferably a laser scanner, is increased by placing a cubic phase mask (CPM) in the scanning beam. The masked beam is then scanned and reflected off a bar code and received by a photodetector. The recei...
04/15/2003
6505778Optical reader with selectable processing characteristics for reading data in multiple formats
A multi-function optical reader comprises an photosensor, such as a charge-device (CCD), and signal conditioning and processing circuitry including separate channels for handling data in different formats. A bar code processing channel digitizes the scan ...
01/14/2003
6502751Methods and apparatus for dual thresholding in processing of barcode signals
A system for dual thresholding digital barcode processing. A light reflected from a barcode is captured by a photodetector to produce a photocurrent. The photocurrent is converted to a voltage, amplified and filtered to produce a photovoltage. The photovo...
01/07/2003
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