Showing posts with label CD quality. Show all posts
Showing posts with label CD quality. Show all posts

Saturday, March 3, 2012

How Vinyl and iPods Ganged Up to Kill the Audio CD

NPR reported that CD sales tanked in 2010, particularly among younger buyers. The trend has continued until now and suggests that vinyl and iPods are sinking the audio CD into the so-called "fidelity belly," where mediocre products go to die.

[Image: Race to Obsolesence, David Lane.]

In his book Trade-Off, journalist Kevin Maney wote that a truly successful product provides either the richest user experience (fidelity) or the greatest convenience. Less successful products fall into what he labeled the fidelity belly, "the no-man's-land of consumer experience," characterized by commercial apathy, insufficient fidelity and insufficient convenience. (See diagram below right.)

Apple succeeds in the consumer computer market by providing the richest pre-sales experience in its retail stores. Dell and HP succeed by providing an ultra-convenient pre-sales experience online. Who is in the belly? Everyone else.

Sinking into the fidelity belly is essentially the fast track to obsolescence. Staying out of the belly is never assured, because customer expectations for fidelity and convenience constantly evolve.

While it may seem that the audio CD thrived for more than 20 years because of high fidelity, what it really offered over its fraternal twin on vinyl was convenience better robustness, more portability, multi-disc changers, in-vehicle players, random/repeat play, remote control.

In the last decade the iPod arrived to match all the conveniences of the CD, adding small (and ever smaller) player size, ubiquitous portability, invisible storage, and greater (and ever greater) capacity. Nothing can match the convenience of weightless digital audio, now available in a variety of formats at both lower and higher resolution than CD quality (choice is convenient, too).

On several online forums catering to vinyl aficianados, I posed the question, "what is it about playing an LP that appeals to you?" After all, the fundamentals of record playback haven't significantly changed in 100 years. It isn't necessarily sound quality (except among self-described audiophiles). Almost unanimously, the response came back that the real appeal of vinyl stems from interaction with an LP as a satisfying physical object large format album art, liner notes, even having to flip sides. Respondents were quite eloquent about it.

When was the last time you ever heard anyone wax rhapsodic about interacting with a CD? Has anyone ever considered a CD collectible for its nostalgia value or status as an art object? The audience for vinyl will keep it out of the belly by uniquely defining fidelity for themselves, establishing a multi-sense standard no other physical medium is likely to meet.

Thus the CD has been forced back along the convenience axis by dematerialized digital audio, forced down along the fidelity axis by vinyl, and ultimately swallowed up in the fidelity belly. It is now or will be soon become obsolete. (What to do with obsolete CDs? Here is one idea.) At least one study concluded that less than 10%  of listeners will be buying physical media in 2-4 years; that population will likely consist almost entirely of vinyl buyers, not CD buyers.

Way out in fidelity/convenience space is Maney's "fidelity mirage," a product that can deliver both super-high convenience and super-high fidelity. It is virtually impossible to do this in the commercial marketplace. Companies that attempt to reach the mirage usually fail and sink back into the belly.

But consider a high-resolution digital transfer of an LP, taken on the owner's own equipment, calibrated to his exact specifications, and restored in software to the best possible sound quality. The dematerialized result delivers super-high convenience, the original physical object retains its super-high fidelity. Is the fidelity mirage real?


            Vinyl-to-Digital Restoration #24           

Title: Social Studies
Artist: Carla Bley
Genre: Jazz
Year: 1981



Carla Bley (b. 1936) has composed and performed in a wide range of styles over her long career, including free jazz, jazz opera, political jazz with Charlie Haden's Liberation Music Orchestra, and one of most beautiful Christmas records ever. But the music that resonates most with me comes from the large ensemble with the ever-shifting lineup known as The Carla Bley Band. Social Studies is a fine example of their work. But, of all my Carla Bley LPs, I really chose to highlight this one here for its cover art still life of endangered physical media.


© 2012 Thomas G. Dennehy. All rights reserved.


Monday, January 9, 2012

A Xerox of a Poloroid of a Photo of a Painting

What format and bit rate should you choose for ephemeralizing your LPs?

While it may be popular, lossy compressed audio has its detractors. In an interview, Grammy-winning producer T. Bone Burnett likened its fidelity to the sonic equivalent of "a xerox of a poloroid of a photo of a painting."

[Image: low-res Beatles Sgt. Pepper album cover.]


Nonetheless, the 256 KBit/sec MP3 has become the de facto standard for purchasing and streaming music in the cloud.

Like WMA and AAC, MP3 is a lossy compressed format. (The three formats are interchangeable for the purpose of this discussion.) You can't uncompress an MP3 and get back the original audio. Some information is thrown away in the compression process to gain additional compaction over lossless compressed formats.

Lossless uncompressed formats incorporating linear pulse-code modulation (LPCM) capture a direct digital representation of an analog wave. "CD-quality" uses 16-bit samples taken at 44.1 KHz. The equivalent bit rate of 1411.2 KBit/sec transmits more than 5x the information in MP3 audio, with no loss due to compression. (See figure at right.)

Even a CD-quality copy introduces downsampling from the original. Most digital studio recordings are made with 24-bit samples taken at 96 KHz. The equivalent bit rate of 4608 KBit/sec transmits 18x the information in MP3 audio and more than 3x the information in CD audio.

It is possible to make 24-bit/96KHz recordings at home, 18x richer than a "good" MP3. Gigahertz computer clocks facilitate high sampling rates. Near-zero cost of storage makes compression unnecessary.  But is it worth generating and storing all those bits? Can anyone really hear the difference?

My Harman colleague Dr. Sean Olive, Director of Acoustic Research, is actively seeking a scientific answer to that latter question. My answer is simple: I don't care.

When it comes to information, more is always better. The digital transfer pipeline is software-driven. You may or may not be able to "hear" the difference, but your software tools can "see" the difference and work better when they have more to chew on. I'll use use the next couple posts to try to convince you to seek and preserve as many bits as possible when recording and processing, even if you ultimately choose a compressed format in which to store and enjoy your end products.


              Analog-to-Digital Restoration #8             

Title: Diamonds and Pearls
Artist: Prince & the New Power Generation
Genre: Soul and R&B
Year: 1991



Everything we've said regarding digital transfer of LPs applies identically to other analog source material. If you still have the equipment to play something, you can usher it into the digital future. I recently bought a like-new Denon DRS-810 at an estate sale for $25—a real find—to add to my recording station. My wife's equally like-new cassette copy of this Prince title is now ephemeralized.


© 2012 Thomas G. Dennehy. All rights reserved.