My new Headphone Hat

While I appreciate all of the Christmas presents I got this year, I was particularly taken by the usefulness of a present of a Bluetooth Headphone Hat.This is a regular knitted hat which has two small speakers hidden in the seam which allow it to act as a Bluetooth Headset.

.My initial impression was that this was a fun gimmick - an impression reinforced by the fact that the brand name is Techfun. However, I now realise it is a really useful and practical gadget.

I normally wear a Bluetooth Headset while running so that I can listen to podcasts. However, the action of running tends to shake many headsets off my head - which means that I need to choose a headset that wraps around my ears and can be quite uncomfortable to wear for extended periods. The headphone hat is quite comfortable to wear and while the sound quality is not great, it is certainly good enough for my needs. In addition I would need to wear a hat like this anyway while running at this time of year, this means that I can reduce my number of pieces of equipment by combining a set of headphones with a hat.

Bluetooth devices don't always admit all of their capabilities

The Bluetooth protocol is used to communicate between all manner of diverse types of device. In order to ensure that you don't try to do something silly like play music on your heart rate monitor, devices must declare which of the various profiles it supports. Of course it is becoming increasingly common for devices to be capable of multiple different functions and so the standard allows them to declare support for more than one profile.

The most common type of Bluetooth device, is a hands-free unit which allows you to make phone calls while driving your car without taking your hands off the wheel. These devices implement the Hands-Free Profile. These devices must be capable of outputting sound, so it should in theory be possible to use this device for listening to the music stored on your phone.

Unfortunately, many of these devices don't declare that they implement the A2DP profile. Perhaps this is  because the A2DP standard states that devices implementing this profile should be capable of outputting high quality audio and many hands free units have poor quality - but high quality is a subjective judgement which should be left to the user to decide.

If you have such a device, don't panic because  there is an android application called BT Mono which can solve the problem for you. It works by fooling your hands free unit into thinking there is a call in progress and then whatever sound you play on your phone will be directed to the hands-free unit.

Playing podcasts of music through a Bluetooth Headset on Android

I like to listen to many podcasts on my Android phone. When running or on my bike I tend to listen through headphones. However, it feels strange to plug in headphones while driving in my car. I bought a lead which allows me to connect my phone to the sound system in my car via a cable plugged into the headphone socket on my phone.

This arrangement worked reasonably well until recently when the cable connection started to get loose and crackly. Rather than buy a replacement cable I thought it should be easier to use the Bluetooth hands-free unit to connect  my phone to the car's sound system, but I searched in vain to find a system setting on my phone which would allow me to direct the Bluetooth connection.

After a bit of searching on Google, I found the BTmono application which adds this simple feature. This application is very simple, but effective. When the application is running audio which is normally directed to the headphones (e.g. music or podcasts) is instead sent to the connected Bluetooth device. This means that I can now listen to my podcasts in the car via the sound system or even use a Bluetooth   headset to entertain me while running.

I think this is a clear example of why the Android open model is better than the close system run by Apple for their iPhones. I am guessing that this application would probably not have been allowed into the Apple AppStore.