Audio Precision

Australia

Audio Precision

Australia
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News Article | June 28, 2017
Site: www.prnewswire.com

The Headphone Test Fixture is shipped fully-assembled and ready to use upon arrival, with occluded ear simulators (microphones with acoustic couplers) and preamplifiers installed and connected to BNC-terminated coaxial cables. The microphone/preamplifier pairs are TEDS-compliant, CCP-powered and calibrated. TEDS—Transducer Electronic Data Sheet—programming allows microphone identification and calibration information to be read by a connected instrument, such as the Audio Precision APx1701 Transducer Test Interface. Two sets of pinnae (hardness Shore OO-35 and A-25 respectively) are provided with the unit. The pinnae are symmetric, which offers convenience when testing stereo headphones and earphones. The AECM206 is also delivered with an adapter for the CAL250 sound level calibrator (optional), product documentation and disassembly tools. Calibrated Instrumentation and Accessories From the lab to the production line, confidence in measurement results is integral to confidence in prototype or product performance. Calibration provides documented and traceable verification that instruments and accessories meet or exceed all of their published specifications. Each AECM206 ships with calibration certificates for its integrated occluded ear simulators and preamplifiers, enabling a complete, calibrated test set-up when paired with an APx Series analyzer and APx1701 Transducer Test Interface. "The increasing complexity of audio devices—Bluetooth™ headphones with ANC, for example—is creating ever-more complicated test scenarios," said Dave Schmoldt, Audio Precision Chief Executive Officer. "AP continues to help engineers reduce that complexity by providing test solutions that support analog, digital and electro-acoustic measurement. We're thrilled to now have the AECM206 as part of that test solution." The AECM206 retails for US$11,024, or US$11,232 in an optional hard-shell roller case. About Audio Precision Audio Precision is the recognized standard in audio test. Since 1984, AP has offered high-performance audio analyzer instruments and applications to help engineers worldwide to design and manufacture consumer, professional and industrial audio products. For more information, visit http://www.ap.com/. To view the original version on PR Newswire, visit:http://www.prnewswire.com/news-releases/audio-precision-unveils-binaural-headphone-test-fixture-300480920.html


News Article | September 26, 2017
Site: www.prnewswire.com

Bluetooth Specifications and Profiles APx Bluetooth Duo incorporates the audio features mandated within the Bluetooth 4.2 core specification and supports the Handsfree Profile (HFP v1.7), Headset Profile (HSP v1.2), Audio-Video Remote Control Profile (AVRCP v1.4) and Advanced Audio Distribution Profile (A2DP v1.3). With dedicated source and sink radios, AP's Duo module easily switches between the roles of A2DP source and sink (including AAC), HFP/HSP audio gateway and handsfree, and AVRCP target and controller. A2DP Codecs The introduction of AP's Duo module expands the list of A2DP codecs available to Bluetooth-equipped APx Series audio analyzers to AAC, aptX, aptX-HD, aptX-LL and SBC. APx Bluetooth Duo can act as either source or sink for each of the supported A2DP codecs. Integrated Audio Test As an APx module, Bluetooth Duo is part of an integrated audio test solution, leveraging the power and flexibility of the APx system. Bluetooth Duo can share analog, digital, chip-level I2S and TDM protocols, PDM or HDMI interface capabilities installed in an APx555, APx52x Series or APx58x Series analyzer. Intuitive and powerful, APx500 measurement software provides access to a long list of Bluetooth settings and parameters, while allowing easy automation of connection, pairing and settings commands in a stepped sequence for production test applications. "Whether in the home, office or car, wireless audio—both voice and music—is rapidly becoming an integral part of modern life," said Dave Schmoldt, Audio Precision CEO. "Enhancing the Bluetooth capabilities of our APx analyzers—expanded selection of A2DP codecs, faster pairing time, new measurement features—helps our users maximize the performance of their next-generation wireless audio products." The APx Bluetooth Duo (APX-BT-DUO) retails for US$4,995 when ordered with a new APx555, APx52x Series or APx58x Series analyzer. The module is available to order now, with shipment commencing in October 2017. About Audio Precision Audio Precision is a recognized world leader in electronic audio and electro-acoustic test instrumentation. Since 1984, AP has offered high-performance audio analyzer instruments and applications to help engineers worldwide to design and manufacture innovative solutions ranging from semiconductor devices to consumer, automotive, and professional audio products. For more information, visit http://www.ap.com/. The APx Bluetooth Duo module is proprietary to Audio Precision, patents pending, and is specifically designed for use with APx Series audio analyzers. APx Duo is a trademark of Audio Precision. The Bluetooth® word mark and logos are registered trademarks owned by the Bluetooth SIG, Inc. and any use of such marks by Audio Precision is under license. Qualcomm aptX is a product of Qualcomm Technologies International, Ltd. Qualcomm is a trademark of Qualcomm Incorporated, registered in the United States and other countries, used with permission. aptX is a trademark of Qualcomm Technologies International, Ltd., registered in the United States and other countries, used with permission. Other trademarks and trade names are those of their respective owners.


Mathew D.,Audio Precision
Electronics World | Year: 2010

Dave Mathew, Audio Precision (AP), addresses the issue of earthling in testing and measurement setups, including analyzers and device under test (DUT). He suggests some optimal configurations and means of providing additional grounding where required. Best practice suggests that the chassis ground of each device needs to be directly connected to the ground of the test instrument via wires having low impedance to prevent such problems. The most effective grounding arrangement for multiple devices is 'star grounding' where each device in the systems connected to the measurement instrument ground via a separate grounding wire. A combination star or bus grounding configuration can simplify connections, while providing good grounding performance, by keeping serial links very short. Some companies also provide the parts required to create star or combination star or bus connections to several devices, including grounding cables designed to connect test switches to an analyzer.


Begin J.,Audio Precision
Electronics World | Year: 2012

Constant voltage method was used to accurately test impedance using the constant voltage method. Two analyzer inputs were used to make the measurements, channel measures voltage across the sensing resistor and the other measures voltage across the speaker. To make the connections easier, a measurement test jig that contains a 0.1ω 50W current sense resistor was constructed. In addition to offering more convenient connections, the 4-wire Kelvin configuration provides more accurate sensing measurements. The impedance is derived from the level result in the acoustic response measurement. The input channels are re-labeled in signal path set-up. A multiplication by 0.1 is equivalent to an offset of -20dB.


Knighten D.,Audio Precision
Electronics World | Year: 2010

A five minute guide to chip level audio test is discussed. The 12S, or Inter-IC Sound is a relatively simple serial data protocol which originated with early CD players as the connection between the optical transport and the digital analogue converters inside the device. It is important to monitor the clock and data lines through a buffered output. Match the timing diagram for the part to the actual timing displayed by the oscilloscope. Using phase offset signals one can also verify the absence of distortion crossover. Troubleshooting connection issues can be rapidly expedited by monitoring the digital signals with an oscilloscope. The unmarked side of double row pin headers is often ground but it is not always safe to assume that. Observe static protection measures to prevent failures.


Begin J.,Audio Precision | Liberman A.,Audio Precision
Electronics World | Year: 2010

The multiplex and RDS encoding for FM broadcast transmission is discussed. Audio recorders and processors are typically connected directly to the inputs and outputs of an audio analyzer. But an FM receiver accepts its audio input over the airwaves as a multiplex encoded FM radio signal. Frequency modulation (FM) was invented in 1933 by Edwin H. Armstrong and FM radio was first used for monaural broadcasting in the 1940s, and FM stereo was introduced in the 1960s. One of the key requirements or stereo FM broadcasting was to maintain backward compatibility with the large existing base of monophonic FM receivers. The RDS message (a) first passes through a differential encode which is the equivalent of a logical exclusive OR (b). Testing an EM receiver requires an EM transmitter or exciter; these are small transmitters that are typically used to drive an RE power amplifier to create a more powerful signal.


Liberman A.,Audio Precision
EE: Evaluation Engineering | Year: 2010

The testing of FM radio receivers equipped with radio data system (RDS) requires an FM transmitter or exciter, a small transmitter that is used to drive an RF power amplifier to create a more powerful signal. The transmitter takes the monaural or multiplexed stereo signal with or without RDS and modulates an RF frequency within the FM band. The audio quality of the transmitter must be better than the receiver under test or the measurements will reflect the transmitter's limitations and not the receiver's. The RDS signal must be added to the audio signal after the FM multiplex stage for testing. Audio Precision offers an RDS encoder utility for use with APx Series Audio Analyzers. The utility creates sine wave test signals and multiplexes and combines them with RDS messages. All frequency response measurements taken from an FM receiver show a sharp high-end roll-off just before 19 kHz due to the FM multiplex filter.


Mathew D.,Audio Precision
Electronics World | Year: 2010

Some recommendations that need to be followed to write the engineering specifications, is discussed. The characteristics of the device that are important enough to be included in the specification have to be decided appropriately. The specifications of an audio device usually include the results of four core categories of measurements including level, expressed in volts (V), watts (W), or sound pressure level (SPL), frequency response, expressed as a statement or graph, and noise. Stating ranges and conditions is absolutely essential and every level measurement is made at some frequency or range of frequencies. Every frequency measurement is made at some level or range of levels. Simply decoding the units chosen for the specification and comparing them to a similar specification stated in different units is a challenge that need to be addressed. Lastly, the specification has to be expressed graphically when appropriate.


News Article | December 13, 2016
Site: www.prnewswire.com

BEAVERTON, Ore., Dec. 13, 2016 /PRNewswire/ -- Audio Precision, the recognized standard in audio test, today announced the expansion of its electro-acoustic test offering with the introduction of a series of calibrated measurement microphones. The microphones are free-field, pre-polarized...

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