Abstract: Described are techniques and systems for providing authentication credentials associated with a user. The user is authenticated using one or more techniques, such as multi-factor authentication using one or more biometric characteristics, biomedical data, passwords, and so forth, to generate authentication data. The authentication data may be used in conjunction with information about a wearable device (“wearable”), such as a wristband. Authentication may be confirmed upon an indication that the wearable has not been removed, tampered with, and so forth. In some implementations the wearable device may store and distribute the authentication credentials to requesting devices so long as the wearable has not been removed, tampered with, and so forth.

Abstract: A wearable computing device, such as a wearable credit card type device or a wearable identification type device, that provides for location based authentication to verify that a user currently in possession of the wearable computing device is indeed the authorized user. In this aspect, the wearable computing device may detect wireless network signals in range of the wearable computing device, and transmit authentication data and the detected wireless network signals to an authentication service. The wearable computing device may then be authenticated when the authentication data corresponds to the user and the detected wireless network signals correspond to a pre-authorized location for authentication.

Abstract: A wearable computing device, such as a wearable credit card type device or a wearable identification type device, that provides for deferred re-authentication that a user currently in possession of the wearable computing device is indeed the authorized user. In this aspect, the wearable computing device may store authentication data input by the user when network connection is unavailable, and transmit the authentication data when the network becomes available. For increased security, location information may also be incorporated so that the re-authentication may only occur within a limited number of geographic locations.

Abstract: In a data acquisition system that captures signal data from one or more input channels, the signal data are compressed prior to transfer or storage. Compression allows the data acquisition system to effectively store more captured signal data in a given amount of memory. The data transfer interface of the data acquisition system requires less bandwidth for transfer of compressed data than for uncompressed data. The compression operations may be performed in real time. The data acquisition system may include one or more analog-to-digital converters to sample analog signals received over the input channels to produce the sampled data for compression. The compressed data are transferred to a processor where they are decompressed prior processing or analysis. This abstract does not limit the scope of the invention as described in the claims.

Abstract: A compressor for waveforms having at least two waveform states separates the waveform samples into waveform state sample vectors for each waveform state. Waveform state encoders encode the waveform state sample vectors separately to provide compressed waveform data. The waveform state encoder selects waveform state pattern vector and associated codes to represent the waveform state sample vectors. The differences between samples of the waveform state sample vector and waveform state pattern vector are calculated and encoded. Encoding can be lossless or lossy. The waveform state pattern vectors and other parameters for compression are determined during a training period. The waveform state encoders detect features in the waveform state sample vectors and waveform state pattern vectors that are useful for common oscilloscope measurements. Typical waveform states include level states and edge states.

Abstract: An enhancement that reduces the digital interface rate of analog-to-digital (A/D) and digital-to-analog (D/A) converters through the use of compression and decompression is described for implementation as a single integrated circuit. Improved A/D converters compressing a sampled version of an A/D converter's analog input signal in real time, thereby significantly decreasing the required bit rate of the A/D converter's digital interface. Similarly, improved D/A converters decrease the required bit rate of the D/A converter's digital interface. D/A converters include a decompressor that decompresses the D/A converter's compressed digital input in real time, prior to conversion to an analog output signal.

Abstract: An enhancement that reduces the digital interface rate of analog-to-digital (A/D) and digital-to-analog (D/A) converters through the use of compression and decompression is described. The present invention improves A/D converters by compressing the sampled version of the A/D converter's analog input signal in real time, thereby significantly decreasing the required bit rate of the A/D converter's digital interface. Similarly, the present invention improves D/A converters by decreasing the required bit rate of the D/A converter's digital interface. D/A converters enhanced by the present invention include a decompressor that decompresses the D/A converter's compressed digital input in real time, prior to conversion to an analog output signal. The present invention's simplicity and its ability to be implemented using multiple compression and decompression elements allow its use in A/D and D/A converters with arbitrarily high sampling rates.

Abstract: An enhancement that improves the performance of test and measurement equipment such as digital oscilloscopes and arbitrary waveform generators through the use of compression and decompression is described. The present invention is particularly effective for compressing and decompressing high-speed, bandlimited analog signals that are not appropriately or cannot effectively be compressed by prior art speech, audio, image, and video compression algorithms due to various limitations of such prior art compression solutions. The present invention improves digital oscilloscopes by compressing the sampled version of an analog waveform under observation in real time, allowing a significantly longer duration of the waveform to be stored in the oscilloscope's capture memory, when compared with the duration of the same signal's uncompressed waveform stored in the same memory.

Abstract: An efficient method for compressing audio and other sampled data signals without loss, or with a controlled amount of loss, is described. The compression apparatus contains a subset selector, an approximator, an adder, two derivative encoders, a header encoder, and a compressed block formatter. The decompression apparatus contains a compressed block parser, a header decoder, two integration decoders, an approximator, and an adder. The compressor first divides each block of input samples into a first subset and a second subset. The approximator uses the first subset samples to approximate the second subset samples. An error signal is created by subtracting the approximated second subset samples from the actual second subset samples. The first subset samples and error signal are separately encoded by the derivative encoders, which select the signal's derivative that requires the least amount of storage for a block floating point representation.