Professional Audio & Video Solutions

SoundWireSM Audio Testing with APx and LnK

SoundWireSM Audio Testing with APx and LnK

Testing semiconductor audio devices with a SoundWire interface using an Audio Precision APx audio analyzer is conceptually straightforward; the test strategy and implementation is no different than with any other IC device.

The challenge is the connection to the SoundWire interface, and configuring the SoundWire device. We can with APx and LNK interface!

    What is SoundWire?

  • SoundWire is a digital audio bus standard developed for the mobile electronics industry by the MIPI Alliance (see Resources at the end of this document). Members of the alliance have developed semiconductor devices that implement the SoundWire specification for audio peripheral devices such as codecs, MEMS microphones, power amplifiers, and wireless interfaces. These IC devices are typically used in smartphones, tablets, and wearable devices.

  • The APx-LnK SoundWire Audio Test System

  • Figure illustrates the interconnections between an APx555 audio analyzer, the LnK SoundWire Protocol Analyzer, and a SoundWire codec evaluation board. In the figure below, analog audio signals are connected between the codec evaluation board headphone jack and the APx555 unbalanced outputs and inputs.

  • Main Advantages

    One System
  • Runs with APx software
  • With interface to SoundWire

Related Solutions

  • Audio Precision Adds STI (STIPA) Measurement Capability to APx500 Software

    Quantifying the Intelligibility of Speech

    Developed as a method for quantifying the intelligibility of speech with respect to a transmission medium—for example a room, an intercom system, a radio link—STI is an objective measure that provides a single rating between 0 and 1 that predicts the likelihood of syllables, words and sentences being comprehended within the intended medium. The rating is broken down into qualification bands ranging from “bad” (0 to 0.36), to “excellent” (0.75 to 1.0).

  • Lip-Sync The time alignment of the audio relative to the video

    I think you know the problems when audio and video are not in sync, what to do?

    We can give you the figure when you are out of sync to get it back easy.

    In both professional and consumer television and A/V systems, divergent audio and video signal paths and the delay inherent in digital processing provide many opportunities for the program sound and picture to fall out of synchronization

Supplier

  • Audio Precision

    Measurement solutions for all things audio.

    Audio measurement- and audio analysis instruments.

Related Blog messages

  • What is new in APx software 4-4

    The latest release of APx500 audio measurement software, version 4.4, is available for download at AP.com.

    The release includes minor feature improvements, including regulation enhancements and the option to maintain Bluetooth® connection even when Bluetooth is not selected as output or input.

    APx500 Measurement Software
    (Must be a registered user of AP.com
    and logged in to download)

  • Perceptual audio analyse met APx 525

    PERCEPTUAL AUDIO TESTING (PESQ) OPTION

    APx500 v3.0 now supports a PESQ (Perceptual Evaluation of Speech Quality) option for use with APx audio analyzers. Obtain MOS results directly in APx projects,

  • PDM option for APx

    Pulse Density Modulation (PDM) is a one-bit, high rate data stream that conveys a signal by modulating the density of the pulses. A typical application for PDM is the Micro-Electrical-Mechanical System (MEMS) microphone found on smartphones.

    The APx PDM option provides direct connectivity for audio devices that have a PDM output (such as a MEMS microphone) or input (such as the decimator on a smartphone chip). In addition to all the standard audio measurements, APx provides variable DC voltage, variable sample rate, and a PSR (power supply rejection) measurement to test the device’s full operating parameters. No other analyzer combines direct PDM connectivity with APx’s best in class speed, ease-of-use, and performance.