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Audio Application Evaluation Kit (AEK)
Price: $250.00

The GainSpan Audio Application Evaluation Kit (AEK) is an evaluation version of the Audio ADK. The Audio Application Evaluation Kit (AEK) includes the application hardware and binary-only software and does not contain the source code as in the ADK.

The GainSpan Audio Application Development Kit (AEK) is a complete reference design that demonstrates an audio streaming application based on the GainSpan GS1011M Wi-Fi Module, audio application board and the associated embedded and mobile software suite. The GainSpan Audio AEK finds use in applications such as remote speaker/microphones, walkie-talkies and baby monitors. It supports a variety of use cases - streaming music from smartphones to a remote speaker or headphones, streaming voice audio data from the audio application board to the smartphone, or walkie-talkie mode to enable two-way audio communication.

The Audio AEK includes the Audio Application board, embedded software binaries and mobile applications for iOS based smartphones. 

The Audio embedded software includes the complete audio application software and Wi-Fi and networking stack including mDNS/DNS-SD based discovery methods to discover devices and services available on the wireless network. The Audio mobile reference applications provide customers a foundation to rapidly build custom features suited to their end application.

Benefits:

  • Complete Audio reference design that allows users to stream audio data between the Audio Application board and iOS based smartphones
  • Accelerated time-to-market for development of new wireless audio applications such as remote speaker/microphones, walkie-talkies and baby monitors.
  • Quick and easy way to integrate audio streaming services into end products using GainSpan Audio Application board and embedded/mobile software suite
  • Provides mobile platform APIs and reference source code to facilitate customized audio application development
  • mDNS/DNS-SD methods support discovery of devices and services available on the network without additional configuration

Features:

  • Audio ADK consists of the Audio application board, complete hardware design package, complete software suite including embedded software and mobile reference apps
  • Audio AEK consists of the Audio application board and an evaluation, binary-only version of the software and audio mobile app
  • The Audio embedded application operates in both Limited AP and Infrastructure client modes and use TCP or UDP to stream audio
  • The Audio application supports 3 use cases – streaming audio from smartphone to the audio board and vice-versa, and walkie-talkie mode
  • The Audio embedded application advertises itself and allows automatic discovery by clients using mDNS/DNS-SD discovery methods
  • The Audio Evaluation board features the GainSpan Wi-FI module, Audio codec, amplifier to drive an external speaker, microphone, PTT and WPS/provisioning buttons, and LEDs to indicate status and mode of operation
 

Application USE CASES

The GainSpan Audio ADK runs on the Audio application board, and supports Wi-Fi streaming to and from an iOS smartphone. On powering up the application board, the Wi-Fi module establishes itself as a Limited AP, and allows users to browse to the list of wireless networks and connect to the Audio ADK board. The mobile application leverages discovery exposed by the Audio embedded firmware application, to enable automatic discovery of available audio services.
After the Limited AP setup is complete, the embedded application software performs application specific initializations for both the GS1011 and audio codec. All communication between the GS1011 and audio codec chip occurs via SPI. The transport mechanism from the audio board to the smartphone used TCP or UDP.
Following initialization, the GS1011 will begin to function as one of the use case models below:

Wi-Fi Streaming Audio to Remote speaker

The GainSpan Wi-Fi streaming demo allows users to select music from their ITunes library or playlists and stream it over to an external speaker connected to the Audio board, using Wi-Fi. The Wi-Fi module receives streaming audio packets from the smartphone and buffers the packets. These packets are then sent to the audio codec chip for decoding, via SPI. This decoded audio stream is then sent to the external speaker. The mobile app has controls to select a song from your music library and play or stop the audio streaming. This application supports mp3 audio streaming at data rates of up to 320Kbps. In Phase 2 (Q1’13), support will be added for other commonly used audio formats such as AAC, WMA and ITunes default MPEG4 (.m4a), at data rates of up to 320Kbps.

Wi-Fi Remote microphone Application

In this use case, the user speaks into the microphone on the Audio application board and the voice data gets transmitted to the smartphone. The GS1011 Wi-Fi module continually reads encoded audio data from the encoder buffer and sends the encoded bytes to the GainSpan mobile application on the smartphone for playback. 

Walkie-talkie

This use case showcases two-way walkie-talkie operation, triggered using either the application “Push-to-Talk” (PTT) button on the Audio application board or a “soft” Push-to-Talk button on the Audio application on the smartphone. When the PTT button, located on the Audio ADK board, is pressed, the audio encoder starts to encode and stream audio data over to the smartphone for the duration of the button press. The smart phone application uses a software button as the PTT button, and follows the same behavior as the embedded application. With current implementation, audio transmission is half-duplex, i.e., one unit transmits and the other receives. 


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