N900 FM radio receiver
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The FM radio is part of the [[N900 Hardware Bluetooth|Bluetooth chip]]. It receives FM radio signals using the headset or earphones plugged into the 3.5 mm socket as an antenna (actually arbitrary headset/headphones, or any other cable, for this purpose). | The FM radio is part of the [[N900 Hardware Bluetooth|Bluetooth chip]]. It receives FM radio signals using the headset or earphones plugged into the 3.5 mm socket as an antenna (actually arbitrary headset/headphones, or any other cable, for this purpose). | ||
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| + | The audio output of the FM radio is connected to the audio codec chip. | ||
| + | This can be routed directly to the headphones - but possibly not the speaker due to concerns about speaker damage due to the speakers not being able to handle bass. | ||
| + | |||
| + | The existing software that uses the radio passes the audio through the CPU, implementing a software filter for speaker protection when the speakers are enabled. | ||
==Software== | ==Software== | ||
Revision as of 23:34, 2 August 2010
The N900 FM receiver allows the reception of broadcast FM radio signals using the headset/headphones as an antenna.
Hardware
The FM radio is part of the Bluetooth chip. It receives FM radio signals using the headset or earphones plugged into the 3.5 mm socket as an antenna (actually arbitrary headset/headphones, or any other cable, for this purpose).
The audio output of the FM radio is connected to the audio codec chip. This can be routed directly to the headphones - but possibly not the speaker due to concerns about speaker damage due to the speakers not being able to handle bass.
The existing software that uses the radio passes the audio through the CPU, implementing a software filter for speaker protection when the speakers are enabled.
Software
The FM receiver is implemented as a video4linux radio device.
The only (?) userspace application that uses the FM receiver is FMRadio.