Saving files in Red Book Format

I have a couple of mp3 files that I want to edit and write to a CD ROM for my car audio system. How do I save them in the correct format for my car stereo ? I have selected the 16 bit PCM according to the docs, but when I burn using Windows Media Player(with volume normalization disabled) I still get choppy audio.

What am I doing wrong ? Any way I can save the files in LPCM format and not PCM since CD Audio demands LPCM and not PCM.

Note the files I am working on are mp3 files before being saved as WAV by Audacity.

What am I doing wrong ?

I am on Windows 8.1x64 with the latest OS updates. I obtained Audacity from its site.

After editing in Audacity, export as “WAV (Microsoft) signed 16-bit PCM”.

In you CD burning application, ensure that you select “Audio CD” (not “data CD”).

Check that the files play correctly before you make the CD. If the CD has playback problems but the WAV files played correctly, then the problem is probably due to either the CD media, or write errors when burning the CD or read errors when playing the CD.

See here for more information:

Yeah I checked all that. So LPCM and PCM have no difference right ?

LPCM is related to PCM but is not the same. LPCM is generally used for low bit-rate/low quality audio.
Standard audio CDs use PCM, not LPCM.

Further information:

That differs from these references:

though confuses the picture by referring to CD with the generic term “PCM” at the top of the article.

So who is correct here? :confused:


Well I’m guilty of adding to the confusion :mrgreen:

No. That’s wrong. I’d not had my second cup of tea of the day.

“PCM” is an abbreviation for “Pulse-code modulation”.
There are many different types of “pulse-code modulation”, including “linear” PCM, A-Law, u-Law (that should actually be a lower case “mu” character), and others,

Strictly speaking “LPCM” is a specific type of “PCM”, but the term “PCM” is frequently used to refer to LPCM. If the “type” of PCM encoding is not stated, then it is probably “linear” (LPCM) that is being referred to.

Yes, Redbook standard CDs use LPCM, though it is usually referred to simply as “PCM”.
The export format referred to in Audacity as “WAV (Microsoft) signed 16-bit PCM” is “LPCM”.

Good. I thought it was. :wink:

I “think” so too from what I have seen buried in libsndfile.


I have selected the 16 bit PCM according to the docs, but when I burn using Windows Media Player(with volume normalization disabled) I still get choppy audio.

“Choppy audio” probably isn’t a format problem…

Is the audio OK when you play the PCM (WAV?) file on the computer, before burning the CD?

If the PCM/WAV file on the hard drive is OK, how does the CD sound when played on the computer.

BTW - I don’t use Windows Media Player for burning CD’s (I use ImgBurn), but most CD burning applications can do the conversion and make a “Redbook” audio CD from MP3 files or other audio formats. So, if you’re not doing any editing, you don’t need Audacity. The trick is to configure the software for “audio CD”, rather than simply burning the MP3 files as “data” or as a “CD ROM”.

Definitely is - I’m awake now :wink:

I agree.

As above. In general, you can dump whatever you have into the Audio CD Authoring and Burning program and it will figure out everything else. If you find yourself worrying about exotic formats and data variations, you are totally doing it wrong.

Many of us find that letting the program have its head and burn as fast as it can is a terrible idea. That can give stuttering and skipping CDs. Try slower burning speeds (they usually give you burn speeds options).

I have another trick. I have a very old portable CD player that won’t play anything. If I can make it past that player, the disk will play anywhere on earth.

This problem got a lot worse after the Fukushima disaster. That took out one of the high quality CD manufacturers leaving us with only second tier makers.