A day with out RCA cables....bluetooth

[adam71 5,000+ posts]

http://www.gizmodo.com/archives/bt-redcare-bluetooth-car-alarm-022413.php thats the only thing Ive found so far.

I would have to pass on that one. That looks like something that could be used to violate someone's privacy. thats why I will never buy a car with OnStar.

 

[MrBlack 10+ year member]

Guys, a single speed CD's data is read at 150 kb/s. That's how much data is contained in a second of 44khz, 16 bit, stereo uncompressed audio. To prove my point, look at an 80 minute cd which is appx. ~700 mb's.

At 150 kb/s: 150(kb)*60(sec) = 9000 kb (1 minute of music)

9000(kb)*80(min)/1024(# of kb's in an mb) = 703.125 (size of an 80 mb cd)

1411 kb/s is something you see Microsoft Windows reference as the playback bandwidth of wav files, and to be honest I don't know where they came up with figure. IF your data was being read at 1411 kb/s, an audio CD would need to be over 6600 mb's!

The same mystery figure goes for mp3's and streaming music. Think about it. How many times in the past have you guys listened to an audio stream off the net claiming 48 kb/s quality or higher on a dialup connection? We all know that dialup cannot sustain speeds of more than 4.5 kb/s on a good day, so what gives. Sure streaming music and mp3's are heavily compressed, but an audio CD is not, so where does the inflated number come from in that instance? I've gone onto tech forums asking this same question and never really got a good explanation, so anyone who feels they can elaborate further, please do.

As for quality of mp3's, yes the higher bitrate the better, but you have to know that even your 320 kb mp3's are taking something away from the music, if they didn't the size of the file wouldn't be so drastically reduced. And regardless of the bitrate, during playback in your car or on your home stereo it still has to be converted back to the native bitrate of your playback source, which ends up to be 44 khz 16 bit stereo audio with a 150 kb/s bitrate.

 

[nikosbuddy 5,000+ posts]

i just thought about this what if you and your buddys were driving...and ya got to close and you started picking up there frequecys like a wireless fm transmitter, driving by someone who was to cheap to get a nice deck with aux in, lol

man that would **** talk about screwed and chopped.

 

[djman37 5,000+ posts]

i just thought about this what if you and your buddys were driving...and ya got to close and you started picking up there frequecys like a wireless fm transmitter, driving by someone who was to cheap to get a nice deck with aux in, lolman that would **** talk about screwed and chopped.

I've always wanted to mod a 'mr. microphone' with a different FM transmitter that could transmit over the entire FM range, just to f with people. Mind you, this was back before CD players in cars were standard and OTA didn't ****.

 

[AVSTANG02]

**** bluetooth.

I would never go wireless.

 

[MrBlack 10+ year member]

Originally posted by Jack Frost Don't think you quite understand...CD's are encoded with .WAV files

I'd like to clarify. Wav files store PCM data, which if sampled at 44khz, in stereo and 16 bit, then yes the data contained within the Wav file would be identical to that of a cd, minus all the header info of course. But the Wav format can be sampled at multiple frequencies and bandwidths so just because it says *.wav doesn't necessarily mean that it's going to be CD audio quality.

Originally posted by Jack Frost DVD-A and SACD will hand regular CD's their *** for SQ...alas, it's tough to find compatible players, especially for car audio.

Originally posted by adam71If that ever happened I would be a happy *** camper......but it won't.

I'd be happy if there was a way to get these recording engineers today to make use of the CD's actual capabilities instead of compressing all of the sound into the upper 1/3 dynamic range for the added loudness factor. Alot of people don't realize how good a well recorded CD can sound, and the way things are going, that's not going to change anytime in the near future. //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

 

[adam71 5,000+ posts]

Guys, a single speed CD's data is read at 150 kb/s. That's how much data is contained in a second of 44khz, 16 bit, stereo uncompressed audio. To prove my point, look at an 80 minute cd which is appx. ~700 mb's. At 150 kb/s: 150(kb)*60(sec) = 9000 kb (1 minute of music)

9000(kb)*80(min)/1024(# of kb's in an mb) = 703.125 (size of an 80 mb cd)

1411 kb/s is something you see Microsoft Windows reference as the playback bandwidth of wav files, and to be honest I don't know where they came up with figure. IF your data was being read at 1411 kb/s, an audio CD would need to be over 6600 mb's!

Now are you factoring in that the kbps is kilobits per second??

 

[adam71 5,000+ posts]

I'd like to clarify. Wav files store PCM data, which if sampled at 44khz, in stereo and 16 bit, then yes the data contained within the Wav file would be identical to that of a cd, minus all the header info of course. But the Wav format can be sampled at multiple frequencies and bandwidths so just because it says *.wav doesn't necessarily mean that it's going to be CD audio quality

I was unaware of that. Thanx for the enlightenment. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

I'd be happy if there was a way to get these recording engineers today to make use of the CD's actual capabilities instead of compressing all of the sound into the upper 1/3 dynamic range for the added loudness factor.

They have but not in the mainstream. Ever heard of XRCD?? Very nice quality.

 

[AVSTANG02]

The great thing for car audio would be fiberoptic cables.

but they are pretty fragile.. wouldnt wanna be twisting and forcing them around my car..

The cool thing is a lot of these multimedia headunits come with brains that can be mounted in close proximity to an amp so a fiberoptic cable could have a short easy run...

 

[djman37 5,000+ posts]

The great thing for car audio would be fiberoptic cables.
but they are pretty fragile.. wouldnt wanna be twisting and forcing them around my car..

The cool thing is a lot of these multimedia headunits come with brains that can be mounted in close proximity to an amp so a fiberoptic cable could have a short easy run...

I've found some fiber optic test kits, like on velleman.com, but they don't have the freq range, nor are they stereo. The stuff of stereo quality seems to be much more expensive, but I really don't know much about audio over fiber.

 

[adam71 5,000+ posts]

1411 kb/s is something you see Microsoft Windows reference as the playback bandwidth of wav files, and to be honest I don't know where they came up with figure. IF your data was being read at 1411 kb/s, an audio CD would need to be over 6600 mb's!

The number 1,411 is not a Windows reference of wav files it is the ACTUAL bit rate of a cd. Only thing is its 1,411 kilobits per second and NOT kilobytes per second.

http://www.jhepple.com/AudioCD/redbook.htm

This website explains better than I can but it basically says that one second of cd audio contains 176,400 bytes of data and there are 8 bits for one byte so multiply 176,400 by 8 and you get the magic rate of 1,411 kbps.

Remember that data rate is most often measured in BITS and physical size is measured in BYTES.

 

[MrBlack 10+ year member]

Thanks for clarifying, makes much more sense now. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[jester73440 10+ year member]

wow there is a lot about data storage that I'm still in the dark about. Someone posted about what if your driving and pick up someone elses signal I'm not 100% on this but with bluetooth once it is paired it won't pick up anything else I've talked on my head set in the car with someone else on theirs, with no problems

 

[AVSTANG02]

guys.. bluetooth is garbage.. hahaha

it is the last technology you would want to use in a car audio setup especially when you guys get into sq...

Ok im done repeating myself.