Re: Please keep out the OT crap! [was Re: How I would like to change the digital cell phone industry.]

#1 (**permalink**) 07-21-2007, 09:11 PM

aint it a groove?
On Jul 21, 1:07 pm, Radium <gluceg...@gmail.com> wrote:
> Please keep out the OT crap! I had to start a new thread because some
> jerks decided to post irrelevant nonsense.
>
> On Jul 19, 12:06 am, Jeff Liebermann <je...@cruzio.com> wrote inhttp://groups.google.com/group/sci.electronics.basics/msg/4b14d9c79e6...
> :
>
> > Radium <gluceg...@gmail.com> hath wroth:
> > >On Jul 1, 7:24 am, shawn.cormi...@gmail.com wrote in
> > >http://groups.google.com/group/sci.e...sg/696d6abf90c...
> > >> how would u like to change the cell phone industry?
> > >Digital cell phones should stop using the compression they use and
> > >start using monaural WMA compression with a CBR of 20 kbps or less and
> > >a sample rate of at least 44.1 KHz.
> > Very roughly, the current 8Kbits/sec encoding rate,
> > compared to your 44Kbit/sec, will only handle about 1/5th the number
> > of users.
>
> Who said anything about 44Kbit/sec?
>
> The bit-rate of my WMA CBR is 20Kbit/sec or less.
>
> > >1. In its uncompressed form, the audio must have a bit-resolution of
> > >at least 16-bit
> > The encoding resolution is not changed by compression. If you encode
> > something with 16 bit resolution, and compress it, you still have 16
> > bit data coming out. It's the data rate or thruput that changes with
> > compression.
>
> Okay.
>
> > >2. The sample-rate of the compressed and the uncompressed version of
> > >the audio must be the same.
> > Not possible. If the rate in and rate out are identical, then there's
> > no compression happening.
>
> Yes it is possible and it is compression. The uncompressed audio is a
> monaural linear PCM at 44.1-KHz-sample-rate with a 16-bit-resolution
> -- this audio has a bit-rate of 705.6 kbps. The compressed audio is a
> monaural CBR WMA at 44.1-KHz-sample-rate with a bit-rate of 20 kbps or
> less.
>
> Where/when is there any change in sample-rate?????????
>
> There is definitely a change in bit-rate. However, that is totally
> different from the sample-rate. Totally.
>
> BIT-rate and SAMPLE-rate are two completely different things.
>
> In linear PCM audio:
>
> BIT-rate = SAMPLE-rate X bit-resolution X number of channels
>
> Stereo has two channels. Mono has one channel.
>
> 44,100 Hz X 16-bit X 1 channel = 705,600 bps

Re: Please keep out the OT crap! [was Re: How I would like to change the *digital* cell phone industry.]

Re: Please keep out the OT crap! [was Re: How I would like to change the digital cell phone industry.]