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71results about "Reversible analogue/digital convertors" patented technology

Integrated circuit for conditioning and conversion of bi-directional discrete and analog signals

An integrated circuit chip for interfacing a digital computer to sensors and controlled devices can be configured to accept and provide a variety of analog and discrete input and output signals. The circuit includes a plurality of signal conditioning cells, a plurality of signal conversion cells, and input and output signal multiplexors.
Owner:HONEYWELL INT INC

Low-current sample rate converter

A low power sample rate converter adapted for use with a telecommunications system transceiver. The sample rate converter includes a first circuit that provides an input signal characterized by a first sample rate and a delayed version of the input signal. A second circuit periodically multiplies, at a second sample rate, samples in the input signal by a first predetermined coefficient in accordance with a predetermined transfer function and provides a first signal in response thereto. A third circuit periodically multiplies, at the second sample rate, samples in the delayed version of the input signal by a second predetermined coefficient in accordance with the predetermined transfer function and provides a second signal in response thereto. A fourth circuit combines the first signal and second signal providing a rate-converted version of the input signal as an output signal in response thereto. In a specific embodiment, the delayed version of the input signal is delayed by one sample with respect to the input signal. The sample rate converter further includes a counter that is clocked by a first periodic signal. The first periodic signal has a frequency related to the first sample rate by a predetermined fraction. The counter is cleared by a second periodic signal having a second frequency equivalent to the first sample rate. The counter produces a counter output at the first frequency. In the preferred embodiment, the predetermined fraction is ⅓ and the first predetermined coefficient is equivalent to the sum of 1 and the counter output. The second predetermined coefficient is equivalent to the difference of 2 and the counter output. The fourth circuit includes an adder for adding the first signal and the second signal and providing the output signal in response thereto. The predetermined transfer function is represented by the following coefficient sequence: [1 2 3 2 1].
Owner:QUALCOMM INC

Analog to digital converter that services voice communications

An Analog-to-Digital-Converter (ADC) converts an analog signal to digital data. The ADC includes a modulator, a decimation filter, and a time dither clock reduction circuit. The modulator receives the analog signal and a feedback signal and, based there upon, produces a modulated signal at a modulator clock rate. The decimation filter couples to the modulator, receives the modulated signal, and decimates and filters the modulated signal to produce the digital data. The time dither clock reduction circuit receives the modulated signal and provides the feedback signal to the modulator. The time dither clock reduction circuit applies both clock reduction and time dithering to the modulated signal to produce the feedback signal. At each modulator clock cycle, the time dithering clock reduction circuit considers modulated signals for a dithering factor, N, previous modulator clock cycles and a modulated signal for a current modulator clock cycle. If at least one constraint is satisfied for the N previous modulator clock cycles, the time dithering clock reduction circuit is allowed to transition the feedback signal with the modulated signal. If not, the time dithering clock reduction circuit holds the prior value of the feedback signal. After a transition, a new dithering factor may be determined. The ADC may be contained in a wireless local area network (WLAN) transceiving integrated circuit that services voice communications in a WLAN with at least one other WLAN device.
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE

Signal converting apparatus for integrating analog-to-digital converter and digital-to-analog converter and integration unit

A signal converting apparatus for integrating an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC) and an integration unit thereof are provided. The present invention integrates ADC and DAC, that do not operate simultaneously, into a signal converting apparatus (SCA), wherein a control signal decides whether an analog-to-digital mode or a digital-to-analog mode is selected. By sharing the operational amplifiers and other components in the SCA, the chip area and the cost are significantly reduced. In addition, in the integration unit, by switching a plurality of capacitor sets with various capacitances, the capacitance coefficients required for switching ADC and DAC are obtained.
Owner:ITE TECH INC

Arithmetic code decoding method and apparatus

According to the present invention, there is provided a arithmetic code decoding apparatus for generating a decoded symbol by decoding an input bitstream generated by encoding information, and outputting a value of a syntax element corresponding to the decoded symbol, comprising: a context index predictor which receives the syntax element indicating a type of the information included in the bitstream, predicts a context index required to decode the bitstream, and outputs the predicted context index; a pipeline arithmetic code decoder which has a plurality of stages of pipelines, receives the predicted context index and the bitstream, executes a decoding process of the bitstream using the predicted context index, and generates and outputs a decoded symbol based on prediction; a context index generator which includes a storage unit that receives and holds previous decoded symbols output before a decoded symbol at the present timing of the decoded symbols output from said pipeline arithmetic code decoder, receives the previous decoded symbols, the syntax element, and context information of the bitstream, and generates a correct context index required for decoding at the present timing; a binarization table searcher which receives the syntax element, externally acquires a predetermined binarization table corresponding to a type of the syntax element, receives the decoded symbol at the present timing output from said pipeline arithmetic code decoder, searches the binarization table using the decoded symbol for a value of the syntax element, and outputs the value of the syntax element; and a prediction failure detector which receives the correct context index output from said context index generator and the predicted context index output from said context index predictor, compares the two context indices, and outputs a prediction failure signal when the two context indices do not match, wherein when the prediction failure signal is output, said pipeline arithmetic code decoder flashes the decoding process executed using the predicted context index, re-executes a decoding process using the correct context index, and outputs a correct decoded symbol.
Owner:KK TOSHIBA

Method and apparatus for playing analog audio to multiple codec outputs

A method and apparatus for playing analog audio in an electronic audio system having multiple audio codecs, only one of which has a direct hardware connection to the analog audio source (e.g., a CD-ROM drive). First analog audio data is received from the analog audio source at a first audio codec, and is converted to digital audio data using the first audio codec. The digital audio data is stored in a memory device, and read back from the memory device, and transferred to a second audio codec. The digital audio data is then converted to second analog audio data using the second audio codec, and output from the second audio codec. An audio controller may be used to store the digital audio data in a loopback buffer within the memory device, and to read the digital audio data from the loopback buffer. The audio controller can also mix the digital audio data with other digital audio data from the memory device. The method can be applied to a system having more than two codecs, i.e., the digital audio data may additionally be transferred to a third audio codec where the digital audio data is converted to third analog audio data, and the third analog audio data is output from the third audio codec. In a particularly advantageous implementation, the first audio codec is part of a portable computing system (e.g., notebook computer), and the second codec is integrated into a docking station which is adapted to operably receive the portable computing system. The audio controller may further be programmed to operate in at least three different states including a prepare loopback state, a loopback running state, and a recording state.
Owner:CIRRUS LOGIC INC

Analog interface for digital instrumentation

Nuclear spectroscopy systems have improved over the course of time especially with the advent of digital pulse processing. One disadvantage of digital processing, however, is that it has eliminated the older, universally compatible interface standard of analog signals. Digital component interfaces are often defined by computer software, protected by copyright and unique to a single manufacturer. Consequently, all components of an entire spectroscopy system must be from a single manufacturer. This not only dictates system wide component replacement, but also impedes optimization that would otherwise occur were component compatibility the rule rather than the exception. The present innovation describes a method and apparatus to relieve the present incompatibility between digital components of a nuclear spectroscopy system that are supplied by more than one manufacturer.
Owner:BEYERLE ALBERT G

Interface adaptation method and circuit used for airborne collision avoidance system

The invention discloses an interface adaptation method and a circuit used for an airborne collision avoidance system, relates to an air collision avoidance technology, and aims to provide a data conversion method and a circuit based on an aerialcarrier platform. The technical note of the circuit provided by the invention is as follows: the circuit comprises an atmosphere height acquiring and coding module, a radio altitude acquiring and coding module, and a fly parameter data conversion module, wherein the atmosphere height acquiring and coding module is used for acquiring current atmosphere height value, and the atmosphere height value is changed into an ARINC 429 data format so as to be finally output to the airborne collision avoidance system; the radio altitude acquiring and coding module is used for acquiring current radio altitude value, and the radio altitude value is changed into the ARINC429 data format so as to be finally output to the airborne collision avoidance system; and the fly parameter data conversion module is used for collecting alarm information generated by the airborne collision avoidance system, the alarm information is subjected to digital-analog conversion so as to be finally output to an airplane reference record instrument. By using the method and the circuit provided by the invention, a compatible problem of the existing airplane and digital airborne collision avoidance system following a Russian-made protocol can be solved.
Owner:四川九洲空管科技有限责任公司

Data converter system capable of avoiding interleave images and distortion products

The invention relates to a data converter system capable of avoiding interleave images and distortion products. The data converter system supplies an output signal with low stray single frequency by making a converted input signal 'step over' or 'get rid of' the stray single frequency by limiting the input signal in an appointed frequency band and performing over-sampling; the stray single frequency can be filtered out; and therefore, compared with the conventional data converter, the data converter system can supply a much more cleaned output signal without a stray dynamic range. For example, according to the embodiment, the interleave data converter system converts the input signal which is limited in a second Nyquist region interleaved into a data converter into an interleave signal, so that a filter with a passband for transmitting a converted input frequency and a stop band for attenuating the stray single frequency is used for filtering the interleave signal; and the obtained output signal is provided with the bandwidth which is the same as that of the output signal obtained by the single data converter, but the obtained output signal is not influenced by the interleave images or some distortion products.
Owner:TEKTRONIX INC
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