Digital signal

About: Digital signal is a research topic. Over the lifetime, 44213 publications have been published within this topic receiving 345279 citations.

Synchronous digital signal to asynchronous digital signal desynchronizer

Abstract: Improved jitter performance is realized in a desynchronizer for obtaining an asynchronous digital signal, e.g., a DS3 signal, from a received synchronous digital signal, e.g., a SONET STS-1 signal. The improved jitter performance results from the use of a unique dynamic bit leaking arrangement in conjunction with a digital phase locked loop and desynchronizing elastic store. An optimum bit leak interval is obtained by controllably leaking a greater number of shorter interval STS-1 bits than the number of received pointer adjustment bits.Additionally, the affect of random pointer adjustments and the superposition of randomly received pointer adjustments on a periodic sequence of received pointeradjustments is minimized by employing a "static" queue of pointer adjustment bits to be leaked. The queue is dynamically maintained at its "static" count so that there are always bits in the queue to be leaked at the desired optimum bit leak interval even in the presence of randomly received pointer adjustments.

Characterization of GSM Non-Line-of-Sight Propagation Channels Generated in a Reverberating Chamber by Using Bit Error Rates

Abstract: In this paper, it is shown how a large mode-stirred reverberating chamber can be used to physically generate a set of non-line-of-sight propagation channels, which are naturally and objectively classified by means of the bit error rate (BER) norm. The experiments are accomplished at the mode-stirred reverberating chamber of the Universita di Napoli Parthenope (formerly Istituto Universitario Navale), and the electromagnetic input signal is a global system for mobile communications, one at 1.8 GHz. It is shown that it is possible to change the BER by means of the stirring process and/or the chamber loading. The proposed technique calls for fast measurements, and therefore, it is amenable to industrial use. The methodology is general and suitable to any digital electromagnetic signal, provided no distortion of modulation occurs.

Audio reproducing apparatus

Abstract: Even when both a digital audio signal and an analog audio signal are inputted, a type of inputted digital audio signal is identified, and an internal signal path is automatically switched based on the result of the identification operation and previously set content. A main storage of a host microcomputer 12 stores signal path information indicating a signal path to be selected for each type of digital audio signal inputted from each external AV apparatus. A DIR 3 identifies the type of digital audio signal inputted from a digital input terminal 1. The host microcomputer 12 switches an A/D switching selector 4 and an analog direct/DSP process switching selector 7 respectively so that a signal path corresponding to the type of signal shown in the result of an identification operation of the DIR 3 is selected, based on the signal path information.

Wave shaping for an implantable medical device

Abstract: In the embodiment of the invention, apparatus and method provide flexibility in generating a stimulation waveform (1901, 1903, 2101) (that comprises at least a stimulation pulse) to an electrode (2611, 2613, 2627, 2629) of an ImplantableNeuro Stimulator (INS). The waveform (1901, 1903) is synthesized for each rate period interval (1902). A portion of the rate period interval is identified, in which the portion comprises at least one phase (2109, 2111, 2113). During each phase, the stimulation waveform is synthesized by a waveform controller (1001) and a waveform generator (1003, 1005). The waveform controller utilizes waveform parameters, e.g. the initial value, final value, and step time duration (2405), to form a digital signal to the waveform generator. The waveform generator utilizes the digital signal to form the synthesized waveform (2101).