600 results about "Gain setting" patented technology

An audio system installed in a listening space may include a signal processor and a plurality of loudspeakers. The audio system may be tuned with an automated audio tuning system to optimize the sound output of the loudspeakers within the listening space. The automated audio tuning system may provide automated processing to determine at least one of a plurality of settings, such as channel equalization settings, delay settings, gain settings, crossover settings, bass optimization settings and group equalization settings. The settings may be generated by the automated audio tuning system based on an audio response produced by the loudspeakers in the audio system. The automated tuning system may generate simulations of the application of settings to the audio response to optimize tuning.

A speech processing system that performs adaptations based upon non-sound external input, such as weather input. In the system, an acoustic environment can include a microphone and speaker. The microphone/speaker can receive/produce speech input/output to/from a speech processing system. An external input processor can receive non-sound input relating to the acoustic environment and to match the received input to a related profile. A setting adjustor can automatically adjust settings of the speech processing system based upon a profile based upon input processed by the external input processor. For example, the settings can include customized noise filtering algorithms, recognition confidence thresholds, output energy levels, and/or transducer gain settings.

A multi-dimensional imaging device and method for automated exposure control that implement two distinct modules to control the exposure and gain settings in the imager so that processing can occur in a multi-tasking single CPU environment. The first module, referred to herein as the imager control module, controls the exposure and gain settings in the imager. The first module is typically implemented in a high priority routine, such as an interrupt service routine, to insure that module is executed on every captured frame. The second module, referred to herein as the histogram processing module, calculates a target contrast (the product of the targeted exposure and gain settings) based on feedback data from the first module and image data from memory. The second module is typically implemented in a low priority routine, such as a task level routine, to allow for the routine to be executed systematically in accordance with priority.

A radar system is described for use in vehicular applications. The radar system is particularly suited to backup warning systems and lane-change warning systems. The radar minimizes many of the problems found in the prior art by providing programmable delays and programmable gain. The radar uses a range search algorithm to detect and sort targets at various ranges within the field of view of the radar. Each target range corresponds to a particular delay and gain setting. The radar searches for targets at the various ranges by running a target search algorithm. For each target range, the search algorithm causes the proper time delay and gain setting. Targets within the selected range are detected and catalogued. Speed of the targets is obtained through Doppler processing. A display is used to warn the driver of the vehicle of the presence of targets at the various ranges. The warning may be visual and/or audible. When used in a lane-change system, issuance of an audible warning is based on the speed of the vehicle.

A method of controlling operation of a wireless device configured in a zero intermediate frequency architecture including a DC loop and a gain loop. The method includes processing energy in a wireless medium to generate a corresponding receive signal, monitoring the receive signal via a predetermined measurement window, detecting a changed condition in the channel, holding the gain feedback control loop at a constant gain level, and operating the DC loop in an attempt to search a stable DC value for the receive signal while the gain loop is held constant. A first case is DC saturation, where the gain is held constant until DC is controlled. A second case is clear channel assessment, where a prior stored gain setting is applied to the gain loop after detecting the end of the packet. A third case is preparation for receiving an expected acknowledgement packet after transmitting a packet, where again a prior stored gain setting is applied to the gain loop and DC is searched.

A disk drive is disclosed comprising a disk including a plurality of servo sectors, a head actuated over the disk, the head for generating a read signal, and a gain control circuit for adjusting a gain of the read signal in response to a gain setting. A bias setting is initialized for the head, and the gain setting for the read signal is initialized. The read signal is processed to detect at least one of the servo sectors, and when at least one of the servo sectors is not detected, the gain setting is adjusted. The read signal is processed with the adjusted gain setting to detect at least one of the servo sectors, and when at least one of the servo sectors is not detected with the adjusted gain setting, the bias setting is adjusted in response to the adjusted gain setting.

A system and method provides virtual ripple signal generation for use in voltage regulation applications. Some switch-mode power converters or voltage regulators use output signal ripple to effect voltage regulation. A virtual ripple generator provides this type of voltage regulator with a virtual ripple signal comprising an offset component responsive to actual load voltage, but with a generated AC ripple component of arbitrary magnitude that is independent of actual output signal ripple. Unlike the actual output ripple signal, the generated AC ripple component is not dependent on implementation specifics, such as circuit board layout or output capacitor ESR, and may have its gain set independent of the offset component. The generated AC ripple component is synchronized to the inductor switching actions of the voltage regulator and thus reflects actual inductor phase switching in single and multi-phase regulation applications. Virtual ripple signal generation can include output (load) voltage droop compensation.

An imaging apparatus capable of preventing photographing sensitivity from being increased more than necessary, reducing image quality degradation caused by camera shake or object shake and easily photographing images in good image quality. Digital camera 1 includes image shake correcting selection 16 that corrects shake of an optical image of a photographing object formed by the imaging optical system L, digital signal amplification section 110 that amplifies an image signal with a gain set by digital signal gain setting section 111, face detection section 120 that detects a face of a fast-moving specific photographing object such as a child or pet, and motion detection section 100 that detects motion of the face of the specific photographing object based on an output of face detection section 120, wherein when a fast-moving specific photographing object such as a child or pet or the face of the specific photographing object is detected, microcomputer 3 increases the gain of a photographing sensitivity changing function compared with when no specific photographing object such as a child or pet is detected, increases ISO sensitivity, increases a shutter speed and shortens exposure time.

A system and method for canceling DC offset for Mobile Station Modems having direct conversion architectures. The present invention is a fast acquiring DC offset cancellation block that provides rapid and accurate DC offset estimates and cancellation techniques to support direct conversion architectures. The fast acquiring DC offset cancellation block combines four mechanisms to rapidly acquire and remove a DC offset estimate after power up, temperature changes, receiver frequency changes, and gain setting changes by increasing high pass loop bandwidth and adjusting DC offset levels at baseband. After removing the DC offset in large portions, the high pass loop bandwidth is decreased to fine tune the previous estimate and to remove any small variation in DC offset due to receiver self-mixing products.

A method of initializing a spectral Doppler mode of operation for an ultrasonic system includes acquiring ultrasound-based data during a two-dimensional mode of operation for a particular examination session and includes automatically establishing settings for the Doppler mode operation parameters based upon the ultrasound-based data. That is, the ultrasound-based data is processed during the session to select spectral Doppler mode settings that are specific to the ongoing session. The session-specific settings are invoked when the system is switched to the spectral Doppler mode. If the two-dimensional mode is a colorflow mode, the Doppler sample volume can be based upon detecting the location of maximum velocity in the colorflow image, the angle correct setting can be based upon maximum velocities in colorflow vectors, the pulse repetition frequency setting can be based upon the maximum frequency shift detected in the colorflow data, and the gain setting can be based upon the amplitude of colorflow data. On the other hand, if the two-dimensional mode is a power mode, the Doppler sample volume is based upon detecting the region of the power mode image having the strongest signals, the angle correct setting can be based upon detecting the direction of flow, the Doppler pulse repetition frequency can be based upon a scale setting for the power mode data acquisition, and a gain setting can be based upon the amplitude of power mode data. Lastly, if the two-dimensional mode is the grey-scale imaging mode, the selection of a Doppler sample volume can be based upon identifying a dark region near the center of the grey-scale image, the angle correct setting can be based upon the orientation of the boundaries of the identified dark region, and the gain setting can be based upon the amplitude of image data.

A black clamp circuit for an image sensor utilizes a differential programmable gain amplifier and a feed-back loop to adjust a black level based on comparison to a reference black level. The gain (and therefore step size and range) of the feed-back loop constant for all programmable gain amplifier gain settings. The gain of the fee-back loop is kept constant by adjusting the values of programmable capacitors in the circuit.

A direct current (DC) offset correction system for a direct conversion receiver and corresponding receiver and methods facilitate reduction of DC offsets in such receivers. One method includes calibrating a DC offset correction system in a closed loop configuration over each of a plurality of gain settings to provide a plurality of offset data for an operating mode of the direct conversion receiver; selecting one of the plurality of offset data based on a current gain setting of the direct conversion receiver as supplied, e.g., by an AGC system; and operating the DC offset correction system in an open loop configuration using the one of the plurality of offset data to correct for a DC offset in the direct conversion receiver.

The invention relates to a method for calibrating sensitivity of a microphone, comprising the following steps: receiving a power supply voltage signal and a sound input signal; judging whether the power supply voltage signal meets a preset condition or not, if so, entering a calibrating mode to continue, and otherwise, stopping; restoring a clock signal from a sound signal; restoring a data signal from the power supply voltage signal; and regulating the amplifier gain and/or microphone bias voltage according to the clock signal and the data signal. A microphone calibrating circuit applying the method comprises a clock restoring module, a data signal restoring module, a gain regulating and controlling and register interface module and a storage, wherein the clock restoring module is used for restoring the clock signal from an output signal of a sound/electricity switching assembly; the data signal restoring module is used for restoring the data signal from the power supply voltage signal, the gain regulating and controlling and register interface module is used for writing amplifier gain regulating data into the storage according to the output of the clock restoring module and the data signal restoring module, and the storage is used for receiving the amplifier gain regulating data from the gain regulating and controlling and register interface module and is used as the grain arrangement when an amplifier normally operates.

A temperature sensor circuit and system providing accurate readings using a temperature diode whose ideality factor may fall within a determined range. In one set of embodiments a change in diode junction voltage (ΔV_BE) proportional to the temperature of the diode is captured and provided to an ADC, which may perform required signal conditioning functions on ΔV_BE, and provide a numeric value output corresponding to the temperature of the diode. Errors in the measured temperature that might result from using diodes with ideality factors that differ from an expected ideality factor may be eliminated by programming the system to account for differing ideality factors. The gain of the temperature sensor may be matched to the ideality factor of the temperature diode by using an accurate, highly temperature stable reference voltage of the ADC to set the gain of the temperature measurement system. The reference voltage may have a trim capability to change the gain setting voltage by a digital address comprising a determined number of bits, with the programmable range for the reference voltage corresponding to a determined range of ideality factors.

A method and apparatus normalizes the playback loudness of stored sound recordings to avoid objectionable variations in perceived loudness between different sound recordings at the same volume setting. In an exemplary processing method, a stored sound recording is processed to determine its loudness. That loudness, or some value derived from it, is then used to set the playback gain used for playing back the sound recording. Thus, for a given volume setting, the playback gain can be set lower for louder recordings, and higher for quieter recordings. In one or more exemplary embodiments, sound recordings are processed as received, or at least some time in advance of their first playback, so that a loudness-based gain compensation parameter can be calculated and stored for them. The corresponding stored gain control parameter can then be selected and used responsive to selecting a particular sound recording for playback.

A mobile communication device (102) receives information in a broadcast control channel (108) including a page message (108). The mobile communication device measures certain parameters (210) of the control channel, such as received signal strength, channel quality, and the present automatic gain setting. These parameters are scored and weighted (300) to produce a signal quality metric (314) to determine the duration of time the mobile communication device can remain in a low power state to conserve battery charge before checking for page alert message in the broadcast control channel next.

An image pickup apparatus includes a color component acquiring unit that acquires picked-up-image color-component signals representing color components of a picked-up image, a face detecting unit that detects a face, a skin-color-region color-component acquiring unit that, when the picked-up image includes a face, acquires skin-color-region color-component signals based on a face detection result, a skin-color-eliminated-component-signal-information creating unit that creates skin-color-eliminated component-signal information obtained by eliminating the skin-color-region color-component signals, obtained by the skin-color-region color-component acquiring unit, from the picked-up-image color-component signals obtained by the color component acquiring unit, a white-balance-gain setting unit that sets a white balance gain by using the skin-color-eliminated component-signal information, and a white balance control unit that performs white balance adjustment of the color components of the picked-up image by using the white balance gain.

A movement stabilizing control ECU 25 includes a differential unit 25a, a cycle calculation unit 25b, a time constant/gain setting portion 25c, a first-order lag processing unit 25d, a pendulum movement detection unit 25e, a control amount calculation portion 25f and a control amount output unit 25g. The time constant/gain setting portion 25c sets a time constant τ and a gain K used at the time of subjecting a yaw acceleration ω′ which is a time-differential value of a yaw rate ω to the first-order lag processing at the first-order lag processing unit 25d, with reference to a function or data of a look-up table, for example, depending on the cycle or the frequency of the yaw acceleration ω′ due to the pendulum movement. The control amount calculation portion 25f multiplies the amplitude of a yaw acceleration ω_d′ outputted from the first-order lag processing unit 25d by a predetermined constant to calculate a yaw control amount with a phase in opposite to that of the yaw acceleration ω_d′ and outputs the yaw control amount to the control amount output unit 25g.