i want a music system which comprise the facility to convert audio cassettes into audio cd/dvd.?

Question

to be specific, a cd/dvd player with cassette player having the facility to copy my old cassettes to cds.

Answer 1

No such thing exists.

You can either:
a) buy a CD burner with a hard drive and record from the cassettes, onto the hard drive, then onto CD, or
b) use your PC to do exactly the same thing.

Answer 2

There is such a thing as a CD recorder of course which will, in principle record your cassettes.
However, they require specialist audio CD's (expensive) and they are not very good at recording long tracks from an analogue source. We used one at church fro recording services (it was a decent Phillips one) but it often went haywire after 30 to 45 minutes losing all of the recording...
All-in-all not recommended (at least not by me and I have used one...)
Here though is your step-by-step guide to doing this on your PC...
Put simply, you will need to connect your cassette player to your PC soundcard, then play the cassette whilst recording on your PC. A step-by-step guide is available at:
http://www.cassette2cd.co.uk/DIY/index.php
(follow the link to ‘Cassette to CD‘)
The recording software is the key, there are some free software downloads available at:
http://www.cassette2cd.co.uk/downloads.php
I have used ‘Magix Audio Cleaning Lab’ and ‘Audacity’ – Audacity is particularly popular since it is free!
If you record to WAV format, expect file sizes of around 10MB per minute, or 1MB per minute for MP3 (at 128kbps).
Once you have your digital versions of the recording on your PC, simply burn them on to a CD (Nero burning software or similar..). If you use Magix Audio Cleaning, the software will burn an audio CD for you without needing additional software (assuming you have a CD writing drive of course!)
You will need the additional 'lame_enc.dll' file to export into MP3 - this can also be downloaded from the free software page.
You can also download a free PDF version of the step-by–step guide from the download page mentioned above, the guide is complete with diagrams and screen-shots.
Hope this helps (if you like the online guide, don't forget to 'DIGG' it....)