Cell phone Analog to Digital Converter
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ok, but analog-to-digital converters do exist for audio equipment: http://www.amabilidade2002.com/toslink2.htm just thought it would be possible that converters are made for cell phones as well Thanks, Nick
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oh,ok. Is it possible to have a more detailed explanation? The guy I'm researching this for is a global dept head. I'd like to be able to give him something substantial Thanks for the help Trollslayer, Nick
I'm not sure what the wiring consists of, but if it includes the antenna and cabling, the difference in frequency alone is enough to prevent it from working. Analog cell phones don't use the same band as modern digitals, and UHF/Microwave signals have very different requirements. The cables, in particular, for lower frequency analog networks are lossy at the higher digital network frequencies, and antenna geometries are different. If there's specialized control wiring built in for the unit, it's certain to be incompatible, and probably can't be changed economically.
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I'm not sure what the wiring consists of, but if it includes the antenna and cabling, the difference in frequency alone is enough to prevent it from working. Analog cell phones don't use the same band as modern digitals, and UHF/Microwave signals have very different requirements. The cables, in particular, for lower frequency analog networks are lossy at the higher digital network frequencies, and antenna geometries are different. If there's specialized control wiring built in for the unit, it's certain to be incompatible, and probably can't be changed economically.
"Welcome to Arizona!
Drive Nice - We're Armed..."
- Proposed Sign at CA/AZ BorderThe wiring does consist of antenna and cabling. Thanks for the insight on the frequency incompatiblity, it was very helpful. thanks, Nick
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oh,ok. Is it possible to have a more detailed explanation? The guy I'm researching this for is a global dept head. I'd like to be able to give him something substantial Thanks for the help Trollslayer, Nick
What Lauren said ! The two systems work on different frequencies, so the ariel on the car will be tuned for the analogue system. Ther are bound to be a host of other problems which are down to the phone model as well - all the audio and power supply interface levels too since it will be designed for Motorola's internal standard at the time. Elaine :rose: The tigress is here :-D
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What Lauren said ! The two systems work on different frequencies, so the ariel on the car will be tuned for the analogue system. Ther are bound to be a host of other problems which are down to the phone model as well - all the audio and power supply interface levels too since it will be designed for Motorola's internal standard at the time. Elaine :rose: The tigress is here :-D
Yeah, I read the one line analogy Laura wrote! Sorry if I wanted an explanation w/ more detail. Its not that I don't believe your explanations, but I still don't understand how you can have an analog-to-digital signal converter for audio equipment, but not for cell phones. The principal for converting a signal is the same, whether the end product is a cell phone or a stereo receiver, right? Thanks, Nick
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Yeah, I read the one line analogy Laura wrote! Sorry if I wanted an explanation w/ more detail. Its not that I don't believe your explanations, but I still don't understand how you can have an analog-to-digital signal converter for audio equipment, but not for cell phones. The principal for converting a signal is the same, whether the end product is a cell phone or a stereo receiver, right? Thanks, Nick
Aside from the frequency differences, analog and digital technologies are entirely different. The analog signal is a FM radio transmission - they are compressed, often scrambled, but FM still. The digital signal is an entirely different kind of beast. To start, the baseband signal is conditioned to optimize it for digitizing. Then it is sampled and digitized, then run through a compression algorithm to reduce data packet size, and finally modulated onto a carrier using a variety of complex modulation schemes. These steps result in a lower bandwidth, freeing up limited spectrum and permitting 10 channels to exist in the bandwidth required for one analog channel (well, 20 and 2 actually, since both support full duplex operation). At the receiving end, the analog system merely detects the incoming FM and reverses the scrambling and compression to restore the original baseband voice signal. In the digital system, demodulation is more complex, and the various signal processing steps used to compress and filter the original signal must be reversed. But at the same time, that digital signal may also contain non-voice packets - emails, text messages, web pages, etc - that must be stripped out of the data stream and processed separately. Assuming that you could somehow squeeze enough usable signal through the entirely inadequate antenna and cabling, you could theoretically build an interface to handle all these steps, but it might cost more than a new car equipped with a digital cell phone interface at the factory. The A/D-D/A functions performed in a modern digital cell phone are a far cry from the relatively trivial processing required to play back a CD.
"Welcome to Arizona!
Drive Nice - We're Armed..."
- Proposed Sign at CA/AZ Border -
Yeah, I read the one line analogy Laura wrote! Sorry if I wanted an explanation w/ more detail. Its not that I don't believe your explanations, but I still don't understand how you can have an analog-to-digital signal converter for audio equipment, but not for cell phones. The principal for converting a signal is the same, whether the end product is a cell phone or a stereo receiver, right? Thanks, Nick
The analogue and digital phone systems work on different frequencies, and the antenna on the car is set up for the analog system frequency band, its that simple. The car compatability is nothing to do with the way the signal coding is done. The tigress is here :-D
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Aside from the frequency differences, analog and digital technologies are entirely different. The analog signal is a FM radio transmission - they are compressed, often scrambled, but FM still. The digital signal is an entirely different kind of beast. To start, the baseband signal is conditioned to optimize it for digitizing. Then it is sampled and digitized, then run through a compression algorithm to reduce data packet size, and finally modulated onto a carrier using a variety of complex modulation schemes. These steps result in a lower bandwidth, freeing up limited spectrum and permitting 10 channels to exist in the bandwidth required for one analog channel (well, 20 and 2 actually, since both support full duplex operation). At the receiving end, the analog system merely detects the incoming FM and reverses the scrambling and compression to restore the original baseband voice signal. In the digital system, demodulation is more complex, and the various signal processing steps used to compress and filter the original signal must be reversed. But at the same time, that digital signal may also contain non-voice packets - emails, text messages, web pages, etc - that must be stripped out of the data stream and processed separately. Assuming that you could somehow squeeze enough usable signal through the entirely inadequate antenna and cabling, you could theoretically build an interface to handle all these steps, but it might cost more than a new car equipped with a digital cell phone interface at the factory. The A/D-D/A functions performed in a modern digital cell phone are a far cry from the relatively trivial processing required to play back a CD.
"Welcome to Arizona!
Drive Nice - We're Armed..."
- Proposed Sign at CA/AZ Bordergood stuff. I get it now, thanks again Roger Nick
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The analogue and digital phone systems work on different frequencies, and the antenna on the car is set up for the analog system frequency band, its that simple. The car compatability is nothing to do with the way the signal coding is done. The tigress is here :-D
oh,ok. thanks Nick
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Sorry, they are far too different :( The tigress is here :-D
I'm clueless is this area,too. My cell, however can run on both, I think. If I'm too far out of range for a digital signal, it will transfer to Analog. (at least I think it does :confused: ) Is that because my phone just happens to have a VHS and a DVD player? (to use an earlier analogy)
Time to reflect.
BW
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I'm clueless is this area,too. My cell, however can run on both, I think. If I'm too far out of range for a digital signal, it will transfer to Analog. (at least I think it does :confused: ) Is that because my phone just happens to have a VHS and a DVD player? (to use an earlier analogy)
Time to reflect.
BW
You have a dual-band set; tri-band units also exist. My SprintPCS phone is a dual, and can fall back to analog when it's out of range of a Sprint cell signal (nearly everywhere). The charges go sky high if I let that happen, so I keep it disabled. What a useless piece of junk, or at least the so-called service is worthless. Even in town where coverage is supposed to be total there are dead spots everywhere, and sitting in my living room the signal will suddenly drop from full scale to zero, and drop the call.
"Welcome to Arizona!
Drive Nice - We're Armed..."
- Proposed Sign at CA/AZ Border -
l a u r e n wrote: its kinda like saying "is there a converter that will allow me to play vhs cassettes in my dvd player?" You mean there isn't one! The salesman never told me that when I bought one of them new fangled gadgets. Michael Martin Australia "I personally love it because I can get as down and dirty as I want on the backend, while also being able to dabble with fun scripting and presentation games on the front end." - Chris Maunder 15/07/2002