Here is a pretty good link which talks about the intercommunication of baseband and AP
http://www.embedded.com/columns/technicalinsights/187203124?_requestid=22 -- Roman Baumgaertner Sr. SW Engineer-OSDC ·T· · ·Mobile· stick together The views, opinions and statements in this email are those of the author solely in their individual capacity, and do not necessarily represent those of T-Mobile USA, Inc. On Nov 11, 12:06 pm, "Roman ( T-Mobile USA)" <roman.baumgaert...@t- mobile.com> wrote: > Hi Joachim, > > That's kind of correct. The so called baseband processor (which runs > the cellular low level stuff, RF, modem functionality, ...), has to > expose whatever would be needed from higher level. You might be able > to get some additional radio property information using AT commands > but getting a handle for the voice stream is much more complex. > > If you want to find out more about this google for interprocess > communication between application and baseband processors. > > -- > Roman Baumgaertner > Sr. SW Engineer-OSDC > ·T· · ·Mobile· stick together > The views, opinions and statements in this email are those of the > author solely in their individual capacity, and do not necessarily > represent those of T-Mobile USA, Inc. > > On Nov 10, 10:17 am, Joachim Neumann <[email protected]> wrote: > > > Hi Dianne, > > > I am also struggling with this issue and would like to understand the > > limitations in current Android hardware. > > > My present understanding is that in on current Android phones there is > > a GSM/3G chip that > > 1. receives the *analogue* GSM/3G antenna signal > > 2. receives modem-like AT commands from Android to initiate phone > > calls, send text messages, etc. > > 3. routes the *analog* audio signal from the GSM/3G antenna to the > > amplifier/speaker or bluetooth headset. > > > In such a setup, the audio signal of the phone call would exist in > > digital form within the GMS/3G chip, but it would be out of reach for > > the android OS. Outside the GMS/3G chip, the call signa would only > > exist in analog form - while being routed to the amplifier/speaker or > > to the bluetooth chip. > > > In this case, the only hope for software access to the audio signal > > during a phone call would be a completely new design that implements > > the mobile phone functionality in software. > > > Is that correct? > > > Dr. Joachim Neumann > > > P.S.: I would like to implement a hearing aid in software, > > seewww.amplicell.com > > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
