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As a long time (from late 2002) member of the Apple® Made for iPod (MFi) and Works with iPhone (WWi) programs, Engineered Audio has developed the technology to be uniquely positioned to provide complete design services for iPod® and iPhone™ 3rd party accessory product development.

We also offer iPhone GSM/TDMA pre-certification testing (Total Radiated Power, Effective Isotropic Sensitivity, GSM/TDMA audbile noise) through the use of our own test facility and GSM Base Station Emulator.

Additionally, for very complex problems, Engineered Audio has a very close relationship with and proximity to the Missouri University of Science and Technology ElectroMagnetic Compatibility Laboratory | link |; with its EMC consortium | link | link |, it is considered to be a world leader for EMC investigation.

Engineered Audio offers these design services:
- Conceptualization and development
- Mechanical / Industrial Design
- Component selection
- Schematic generation
- PCB Layout
- Prototype buildup
- Transfer to production support

Our Capabilities:
- PCB Layout - Rigid, Flex, double sided, multi-layer, etc.
- 3D / Solid modeling to STEP or STL
- RF / Wireless - IR to 5.8Ghz, custom or standards based, data, audio
- Custom antenna design and testing - wire monopole, embedded, spiral, IFA, chip, etc.
- Embedded hardware design - 4 to 32 bits
- Embedded firmware design - Assembly, C, C++
- DSP hardware/firmware development - 16 to 32Bit, Filtering, Convolution, FFT
- Analog and digital interface development - I2C, SPI, SCI, I2S, S/PDIF, Digital/Video, DAC, ADC, etc.
- FCC pre-certification testing

GSM / TDMA EMC Articles (TDMA Audible Noise Susceptibility) - These articles might be of interest to those doing 3rd party accessory product development for the Apple® iPhone™.

'Reducing audio buzz in GSM cell phones', Bill Poole, Freescale | link | pdf |
'Eliminating the Audible Buzz in GSM Phones', Nicholas Holland, Mike Score, TI | link | pdf |
'Noise, TDMA Noise, and Suppression Techniques', Allan Soriano, National | link | pdf |
'Real-Time Bayesian GSM Buzz Removal', Han Lin, Simon Godsil, Cambridge | link | pdf |
'Reduce the Buzz in Cellular Phones', Nicholas Holland, Mike Score, Electronic Design | link | pdf |
'RFI: Keeping Noise out of your designs', Paul Rako, EDN | link | pdf |
'Reduce RF noise effects in headphone amplifier', Adrian Rolufs, EETimes | link | pdf |
'Minimizing RF Susceptibility in Cell-Phone Headphone Amplifiers', Maxim-IC | link | pdf |
'Managing Noise in Cell-Phone Handsets', Maxim-IC | link | pdf |
'Guidelines for Improving the RF Immunity of Audio Amplifiers', Kymberly Schmidt, Maxim-IC | link | pdf |

* Apple, iPod, iPhone, Made for iPod (Logo), Works with iPhone (Logo) are all trademarks or registered trademarks of Apple Inc. No endorsement of Engineered Audio by Apple is implied, expressed, or to be construed.