By Neil Hughes

Published: 08:29 AM EST (05:29 AM PST)

Apple has shown interest in building a clip-on iPod with the same wearable form factor as the current iPod nano or iPod shuffle, but with a new integrated speaker built directly into the rear clip.

The interesting concept was revealed this week in a new patent application published by the U.S. Patent and Trademark Office. Discovered by AppleInsider, the filing is simply entitled, "Speaker Clip."

The text of the proposed invention makes no specific mention of the iPod nano, or even the similarly shaped iPod shuffle. In fact, it doesn't even include Apple's iPod brand name. But the accompanying images show a device that looks like the current clip-on iPod nano and iPod shuffle, only with the new inclusion of an integrated speaker.

The new iPod would feature the same clip on the back that is found on the current wearable models, but that new clip would have a cavity in the middle. Filling that hole would be an "acoustical device," or speaker.

That speaker could simply be used for user-interface feedback, providing simple sounds such as clicks to create a more intuitive experience for users when utilizing the multi-touch screen on the front of an iPod nano. Or it could also be used as a more full-featured -- albeit tiny -- speaker to listen to music tracks, or perhaps even do something new, like play games.

The speaker located on the attachment clip would be wired back to the main housing of the device through a "conduit" in the spring-loaded hinge that attaches the clip to the device. The speaker could also be protected by a cover that could shield the speaker from the elements, but also allow sound to pass through.



The filing notes that any kind of acoustic speaker could be used in this device, but one example given is a piezoelectric speaker. The conduit that connects the speaker to the main housing and processor could be a coaxial cable, flex microstrip, or fine gauge wire.

The protective cover layer could be a solid surface with numerous perforations, allowing sound to pass through. A mesh layer atop the speaker, woven from either plastic, metal or natural fibers, could be attached with an adhesive to the protective cover layer.



The iPod nano gained its touchscreen-driven design in September 2010 with its sixth-generation hardware revision. The small, wearable device is 46 percent smaller and 42 percent lighter than its predecessor, yet it still manages to include up to 16GB of storage, a 30-pin dock connector, hardware volume buttons and a lock button, an FM radio, and even Nike+ integration with a pedometer.

There has been some previous evidence that Apple plans to expand the functionality of its diminutive iPod nano even further while retaining its current form factor. One alleged prototype reveled in a picture this May claimed to show a rear-facing camera placed on the device. But this week's filing is the first suggestion of an integrated speaker.

The proposed invention, made public this week, was first filed with the USPTO in May of 2010. It is credited to John Benjamin Filson, Eugene Whang, and Matthew Rohrbach.