Patent application number | Description | Published |
20080298576 | Communication system, communication control unit, communication control method. communication control program and monitoring unit - A communication system | 12-04-2008 |
20090129584 | Echo Canceller - An echo canceller which can respond to a sudden change in echo characteristics in real time and does not require an alteration outside the echo canceller, includes a smoothed sending-speech signal calculation means for calculating a smoothed sending-speech signal from the sending-speech signal, the smoothed sending-speech signal being obtained by smoothing the sending-speech signal; a smoothed receiving-speech signal calculation means for calculating a smoothed receiving-speech signal from the receiving-speech signal, the smoothed receiving-speech signal being obtained by smoothing the receiving-speech signal; a delay time information generation means for obtaining delay time information reflecting delay characteristics of an echo path in accordance with a correlation between the smoothed sending-speech signal and the smoothed receiving-speech signal; and an update information generation means for obtaining update information indicating execution or suspension of updating of the tap coefficients of the adaptive filter, in accordance with the sending-speech signal, the receiving-speech signal, and the delay time information. | 05-21-2009 |
20110069847 | Sound collecting device, acoustic communication system, and computer-readable storage medium - There is provided a sound collecting device, including: an orientation direction forming section that forms an orientation direction of a microphone array; and a control section that, when a characteristic in a frequency band of a synthesized signal obtained by synthesizing the acoustic signals corresponds to a characteristic of an acoustic signal corresponding to a sound other than a target sound, controls the orientation direction forming section such that an orientation direction that is a direction that is different than an orientation direction of the microphone array at a present point in time is formed, and, when the characteristic in the frequency band of the synthesized signal does not correspond to a characteristic of an acoustic signal corresponding to a sound other than the target sound, controls the orientation direction forming section such that the orientation direction of the microphone array is maintained. | 03-24-2011 |
20120207182 | Encoding System and Encoding Apparatus - An encoding apparatus | 08-16-2012 |
20130089147 | Video Transfer System - A synchronization signal generator of a decoder adds a predetermined value to a time value, and outputs a synchronization signal when the added time value coincides with a reproducing time value in a frame. | 04-11-2013 |
Patent application number | Description | Published |
20090074177 | Echo canceler and echo canceling program - An echo canceler uses an adaptive filter to remove an echo of an incoming far-end signal from an outgoing near-end signal. Filter coefficients are calculated and updated while the far-end signal is active so as to minimize the residual echo. In addition, the far-end signal and near-end signal are sampled to generate simulated far-end and near-end signals, from which substitute filter coefficients are similarly calculated while the far-end signal is silent. When the far-end signal changes from silent to active, the substitute filter coefficients are swapped in as initial values for the filter coefficients, thereby speeding up subsequent convergence of the filter coefficients without significant added computational cost. | 03-19-2009 |
20090232297 | Echo canceler and echo canceling method - An echo canceler uses an adaptive filter to remove an echo of an incoming far-end signal from an outgoing near-end signal in the presence of ambient noise, updating the filter coefficients while the far-end signal is active and the near-end signal is inactive. The near-end and far-end signals are also sampled to obtain data vectors, which are averaged to generate simulated near-end and far-end signals, from which substitute filter coefficients are calculated and updated while the far-end signal is silent, the substitute filter coefficients being used when the far-end signal becomes active again. The number of data vectors averaged is varied according to the ratio of echo power to ambient near-end noise power, or according to the echo attenuation ratio, thereby speeding up convergence of the filter coefficients. Data sampled while the near-end and far-end signals are both active are excluded from the updating process. | 09-17-2009 |
20090257579 | Echo Canceller - An echo canceller is capable of reducing echo feeling in a conversation even if a tone signal is input. The echo canceller of this invention judges whether a far-end input signal is a calling control tone signal or not, and if that is the case, resets a coefficient of an adaptive filter. An echo canceller of another aspect judges whether a far-end input signal is a predetermined kind of a tone signal or not, and stops the update of the coefficient of the adaptive filter if the result is affirmative and an amount of echo cancellation is not larger than a threshold value. Further, when the tone signal ends, the echo canceller compares amounts of echo cancellation before and after the end of the tone signal, in accordance with a result of the comparison, restart the update of the coefficient of the adaptive filter after resetting the coefficient of the adaptive filter, or restarts the update of the coefficient of the adaptive filter without resetting the coefficient of the adaptive filter. Moreover, notch filters may be provided to eliminate a tone signal frequency component at input stages of the adaptive filter and the adder for echo cancellation. | 10-15-2009 |
20100086122 | Echo canceller and echo cancelling method and program - An echo canceler uses an adaptive filter to remove an echo of a far-end input signal from a near-end input signal. Filter coefficients are calculated and updated while the far-end signal is active. While the far-end signal is silent, substitute filter coefficients are similarly calculated to be swapped in as initial values for the filter coefficients when the far-end signal changes from silent to active. The substitute filter coefficients are generated from a simulated far-end signal and a simulated near-end signal obtained by combining corresponding samples in different intervals of the far-end and near-end input signals. To facilitate convergence of the substitute filter coefficients, use of the simulated far-end and near-end signals is disabled when the corresponding samples cancel out. | 04-08-2010 |
20100184488 | Sound signal adjuster adjusting the sound volume of a distal end voice signal responsively to proximal background noise - In a sound signal adjuster for use in telephone circuitry including a microphone capturing sound to produce a first sound signal and a loudspeaker, a second sound signal representative of a sound in a vicinity of the loudspeaker is obtained, and transitions are detected in the first and second sound signals to determine whether or not the sound in the vicinity of the loudspeaker is blocked. When the blocking is detected, a difference is calculated between a first frequency characteristic detected in response to the sound captured by the loudspeaker being determined as blocked and a second frequency characteristic detected in response to the sound captured by the loudspeaker not being determined as blocked. The difference calculated is used for suppressing a noise component included in the first sound signal. | 07-22-2010 |
20100226492 | Echo canceller canceling an echo according to timings of producing and detecting an identified frequency component signal - An echo canceller includes an initial delay estimator producing a reference signal containing an identified frequency component masked by means of frequency masking effect to output the reference signal on an echo path, and detecting, from a sending voice signal, an echo component of the identified frequency component derived from the reference signal. The estimator finds an initial delay amount on the echo path on the basis of a forming timing of the reference signal containing the identified frequency component and a detection timing of the echo component in the identified frequency component in the sending voice signal. The echo canceller includes a delay circuit for delaying a received voice signal by the initial delay amount on the echo path obtained from the estimator to supply a resulting signal to a pseudo echo generator. | 09-09-2010 |
20110058667 | ECHO CANCELLER HAVING ITS EFFECTIVE FILTER TAPS ADAPTIVELY CONTROLLED WITH ECHO CANCELLATION AMOUNT MONITORED - In an echo canceller including an ADF and a cancellation adder, an ACANC calculator finds an average value of the amount of echo cancellation for a predetermined period to update the average value of the amount of echo cancellation, and detects a convergence state of the ADF to find the amount of echo cancellation in the convergence state of the ADF. A coefficient selector, when receiving a detection signal of the convergence state from the ACANC calculator, finds a power ratio of the sum total of power of all tap coefficients and the partial total of power of tap coefficients not to be assigned to taps to determine the effective number of taps useful for suppressing an echo component on the basis of the amount of echo cancellation and the power ratio. The ADF updates only the effective number of taps to disable the remaining taps. | 03-10-2011 |
20110150067 | Echo canceller for eliminating echo without being affected by noise - In an echo canceller, a specific frequency component eliminator eliminates a specific frequency component of a specific frequency from a receiver signal to output a resultant signal to an echo path. A specific frequency component detector detects a frequency component of the same frequency as the specific frequency eliminated by the specific frequency component eliminator from the transmitter signal. A noise calculator finds noise power on the basis of power of the specific frequency component detected by the specific frequency component detector, and finds total power including noise and an echo component on the basis of power of a frequency component including the echo component. A control parameter calculator uses the noise power and the total power found by the noise calculator to find a control parameter of the echo canceller. | 06-23-2011 |
Patent application number | Description | Published |
20090254739 | INFORMATION PROCESSING DEVICE - An information processing device having a function for efficiently debugging a parallel processing program by controlling snoop operation is provided. The information processing device is so configured that the following is implemented: the setting for receiving a snoop request from a central processing unit can be set at a snoop controller that controls snoop operation; and as the result of reception of a snoop request, a debug controller can stop multiple central processing units. | 10-08-2009 |
20100082940 | INFORMATION PROCESSOR - An information processor controls accesses to a cache memory from application software programs differing in range of addresses, accesses to which are authorized. The cache memory blocks an access to an unauthorized address. In the information processor, an ID is assigned to each application software program, and the tag field of the cache memory is extended. Further, in performing “Cache Fill” (i.e. reading main memory data into the cache memory), the ID is recorded. At the time of making a cache hit judgment, the access control is performed by comparing the extended tag field with ID of an application software program group of an access requester. | 04-01-2010 |
20100251017 | Soft error processing for multiprocessor - The data processor having CPUs each capable of accessing memories enables the processing of a memory error according to the processing mode of the data processor. The CPUs have a memory, and each include a first storing unit capable of storing CPU-identifying information which enables identification of CPU having accessed the memory. At the time of occurrence of a soft error owing to access to the memory, the CPU, having the memory, stores the CPU-identifying information for identifying the CPU having accessed the corresponding memory in the first storing unit, and notifies the interrupt controller of occurrence of a soft error of the memory. After having received an interruption of the memory soft error from the interrupt controller, the CPU uses information stored in the first storing unit to identify the CPU having made the access, and performs the error processing. | 09-30-2010 |
20110055435 | DATA PROCESSOR - The data processor provides an access protection with higher reliability during data transfer control according to a transfer condition set by CPU. The data processor has: CPU; a memory management section operable to control data transfer by CPU; and a transfer controller operable to control data transfer. The transfer controller holds identification information which the memory management section uses for access protection. When producing an address for transfer according to the setting of CPU, the transfer controller starts data transfer on condition that the identification information corresponding to the address for transfer matches the identification information of CPU at the setting of a transfer condition, etc. | 03-03-2011 |
20130097451 | Computer and Data Saving Method - It is provided a computer comprising a nonvolatile memory for storing data, a control processor for controlling the saving of data into the nonvolatile memory, and a battery for supplying power to the computer in case of a failure of an external power supply, wherein the control processor checks a charge amount stored in the battery, calculates an amount of data which can be saved in the nonvolatile memory by the battery in case of a failure of the external power supply based on the checked charge amount, and saves data excluding the amount of data that can be saved, out of data which should be saved into the nonvolatile memory, into the nonvolatile memory in advance. | 04-18-2013 |
Patent application number | Description | Published |
20090304178 | Echo canceler - An echo canceller, in which an adder adds a pseudo echo generated by an adaptive filter to an echo, so that the echo and the pseudo echo are canceled to each other, includes: a subband filter ( | 12-10-2009 |
20100184487 | Sound signal adjustment apparatus and method, and telephone - A telephone with a speaker and a microphone uses the speaker both as an electric-to-acoustic transducer, to reproduce the far end party's voice, and an acoustic-to-electric transducer, to capture external sound in the vicinity of the near end party. From the captured sound signal and the signal picked up by the microphone, a decision unit decides whether or not the external sound is being blocked. When the external sound is blocked, a volume control unit increases the volume of the far end party's voice as reproduced by the speaker. The near end party can accordingly turn up the speaker volume by moving the part of the telephone including the speaker close to the user's ear to block external sound, without having to manipulate any manual controls. | 07-22-2010 |
20100272248 | Voice communications apparatus - Voice communications apparatus intervenes between a telephone set and a broad-band transmission path that has a communication band broader than a voice band limited by the transmitter and receiver characteristics of the telephone set. The voice communications apparatus includes a transmitter frequency characteristic corrector circuit for correcting the frequency characteristic of a signal input from the telephone set, and a receiver frequency characteristic corrector circuit for correcting the frequency characteristic of a signal to be input to the telephone set. | 10-28-2010 |