摘要:
An audio playback device having a function for adjusting a playback speed, and a method thereof includes, in the audio playback device, stored audio data is decoded and converted into an audio stream in a PCM format, and the audio stream is divided into a high frequency band and a low frequency band at cut-off frequency. The audio stream of the high frequency band is signal-processed using an overlap add (OLA) algorithm, and the audio stream of the low frequency band is down-sampled and signal-processed using a synchronized overlap and add (SOLA) algorithm. Accordingly, calculation time of the stream processor 130 is minimized so that a TSM function is efficiently implemented.
摘要:
A charge/discharge control circuit for controlling current through an input/output audio device includes a first voltage reference; a second voltage reference and a waveform generation circuit responsive to the first and second voltage references for generating a multi-stage waveform profile which is approximately an inaudible waveform for suppressing audible artifacts in the input/output device.
摘要:
A single universal audio processing system intelligently and transparently processes audio streams in real-time. The system receives audio input from one or more sources, determines how the streams should be processed, and automatically processes them in real-time for delivery to an output system. The processing happens without any intervention from the output system, which is oblivious to this processing. A set of audio processing algorithms to accomplish acoustic echo cancellation (AEC), resampling, format conversion, channel mixing or any other desired audio processing function can be supported by a universal processing system, providing a universal solution to audio processing regardless of source or sink. In one embodiment, processing functionality is implemented in an upper filter driver created using a “framework” or software architecture that implements a conventional WDM filter and a dedicated environment for audio processing.
摘要:
When an MFP receives an e-mail to which audio data is attached, an audio data storing unit and a control information storing unit in the MFP respectively store the audio data and control information related to the audio data. When the MFP receives a playback instruction of the audio data through an operation panel unit, a security processing unit compares a security level of the MFP stored in an environment information storing unit with a security level indicated by the control information. When the security level of the MFP is higher, a speaker unit in the MFP normally plays back the audio data. When the security level of the MFP is lower, the audio data is played back in accordance with an alternative playback method indicated by the control information.
摘要:
A method of determining characteristics of a signal and an apparatus using the method. The apparatus for determining characteristics of a signal includes: a level detector receiving sample values of a radio frequency (RF) signal and binary data obtained by binarizing the RF signal, generating selection signals based on the binary data, classifying each of the sample values of the RF signal into one of a plurality of levels using the selection signals, and outputting average values of sample values of each level; and a signal characteristics determiner determining a characteristics value that indicates the characteristics of the RF signal using the average values of the sample values belonging to each level.
摘要:
An audio signal processor is composed of a data path unit, a mode register and a state machine unit. The data path unit applies one or more arithmetical operation to an audio signal for performing signal processing of the audio signal. The mode register stores mode information specifying the signal processing to be performed by the data path unit. The state machine unit sequentially feeds control signals according to the mode information for enabling the data path unit to apply one or more arithmetical operation to the audio signal so as to perform the signal processing. The performed signal processing is composed of the one or more arithmetical operations, and is specified by the mode information stored in the mode register.
摘要:
Methods of processing audio to convey auxiliary information therein without audible evidence of data alteration. Various arrangements are disclosed. One receives plural bit auxiliary data in which the auxiliary information is included, and modulates a carrier signal with the auxiliary data to yield intermediate data. The intermediate data is then summed with the original audio to produce the encoded audio. The carrier signal can be tailored to enhance performance, and the intermediate data can be scaled in amplitude so as to better hide the auxiliary data within the audio. One application of the technology is in monitoring, where the auxiliary information can be used to track usage of audio or audio-visual content.
摘要:
The adage “photos don't lie” is no longer reliable. The advent of digital editing tools makes it relatively easy to move, add, or delete features from photographs. Audio content is similarly susceptible to alteration. This problem is at least partially overcome by providing the content with supplemental data that is below a threshold of human perception. If a version of the content is thereafter encountered with the supplemental data missing or attenuated, it is known to have been altered. By reference to such supplemental data, it is often possible to identify particular portions of the content that have been altered.
摘要:
A noise model is applied to digital signals, such as digital image and audio signals, to determine a tolerable noise level for embedding an auxiliary data carrying signal into the digital signals.
摘要:
Media content, such as imagery (including video) and audio, can be encoded to convey hidden information (steganographic encoding) for a variety of purposes, including communication of auxiliary information (e.g., copyright data), authentication, tamper detection, forensic tracking, etc. The reading (decoding) of the hidden information from the media content is complicated if the content has been corrupted in some manner. One example of corruption is the lossy compression/decompression associated with JPEG processing of digital imagery. In some cases, the corruption introduces errors in the decoding. In other cases, the corruption prevents the hidden information from being decoded at all. In accordance with a preferred embodiment of the invention, reliable decoding of steganographically encoded information is enhanced by processing the corrupted media content so as to counteract some of the corruption. In accordance with another embodiment, the reading proceeds from the corrupted media content, but the results are processed in accordance with the corruption to which the content has been subjected.