Digital Audio that is Good Enough
Another airplane flight, another blog post. This one is about the “new modes” of audio delivery. As many of my readers know I work in the audio industry, I do not often blog about it as I am concerned about the impact my comments could have. Not that I would get in trouble with my employer, heck I was looking for a job when I got this one; but more that people would take my comments and opinions as if I was speaking for my employer. So let my blog, my domain, my opinions, written in my nonworking hours and me unequivocally state that these are my personal thoughts and opinions.
The new mode of delivery I am thinking of is digital distribution of audio products. I purchase music as a digital format less often than most people think. The reason is that most delivery methods are compressed. I believe that compression should be applied judiciously. Not all compression is bad, as I sit listening to music on my iPod on a plane. I decided the quality of music is the item I want for this application.
That is the key; the application is that I want to travel with a large selection of music. It does not have to be pristine as the listening environment is less than pristine. I do however want for airplane flights and time in hotels to be able to have music. I do not always know what kind of music I am going to want to listen to three days from now. I would rather have the selection at a compression ratio that I find appropriate.
I am purposefully omitting numbers, as too often when numbers are listed it becomes a contest by numbers, such as one saying that they will only listen to music at 96kHz sample rate. When I ask why, the answer is often well it is a higher number it must be better. I wonder if that person would be able to tell the difference between 48kHz and 96kHz recordings in the listening conditions I am currently in; a tin can traveling through the air at 300mph with an internal ambient noise of 70dB SPL A weighted through noise canceling ear buds. Probably not so easily, I am not going to say it is impossible; I am going to say it is improbable. I believe and can hear that there is a difference between sample rates in other environments.
At the same time, other listening environments that are acceptable applications for compressed audio for some people are not for me. In my car I have CDs loaded in the changer and a smaller election of non-compressed audio files on the attached iPod. In that environment I can hear a difference between the full quality and the compressed audio. I do not listen to satellite radio music channels in the car often as that compression annoys me and I can hear it. For other people they do not find it objectionable.
The key is that I am deciding. I can control how much compression and the amount of data that is important and acceptable to me. Often buying audio products as digital downloads that decision is someone else’s and I might not agree with it. Paying 99 cents for a compressed piece of music that is just for “fun” can make sense. Paying $15 for a digital download of a CD that is compressed as 11 separate songs versus buying the CD for $15 is something I will not do.
Why you may ask? I have done it, and I have regretted spending the money. The digital download has some audio artifacts that the CD does not. I then can also decide if I want to compress the audio to put it in another format. Not only that, I get to decide the compression protocol as MPEG3 is not always the best. If more people had uncompressed delivery methods I would buy more audio via digital distribution.
The key is to use the best test equipment that we have, our ears, to make the decision for yourself. The way I approach it, is your source should be as ideal as possible and then you have the control to decide what is acceptable compression tradeoffs.
Also please remember that one answer is not the right answer for everyone. The amount of compression that I find objectionable might be perfectly acceptable to someone else. So don’t turn your nose up and ruin other people’s enjoyment just because it doesn’t meet your standards. If people are having fun or the message is getting across isn’t the most important parts of audio being accomplished.
And yes my photographer friends the same thing can be said about JPEG compression. I start with RAW and then I decide how to impact the image as I process it to JPEG or other formats.