PC
Audio isn't dead - it just smells funny
Mission: Improve PC audio
New opportunities exist as consumers are increasingly using PC for audio
throughout the home. However this is causing more audio challenges for
OEMs. Reliability, upsell strategies and user experiences must be improved
and new consumer electronics (CE) standards must be accommodated. There
are specific issues that can be addressed by members of BBQ to improve
PC audio for both OEMs and consumers.
The industry cannot tolerate the audio problem support calls and is proceeding
to take radical measures to control this exposure. This has the potential
to limit upgradability and improvements in the audio subsystem. We hope
to avoid this situation by providing a better path for audio on the platform.
To accommodate new CE connectivity and compatibility, the proposed solution
is a new audio bus. This can be incorporated in core-logic or exist as
a discrete controller. This bus can be utilized by an industry standard
riser that advances PC audio, addresses the OEM's upsell need, and gives
the user a better audio experience.
Compatibility and connectivity
with the CE world
PCs don't exist in isolation and must be able to share data with CE
devices. For the PC to succeed in the living room, it must provide audio
features equivalent to popular consumer electronics gear and be able
to play any optical content.
No practical support for CE related specs
Problem Owner: OS Vendors, Core Logic vendors, Consortiums
Multichannel output has
no way of getting to the speakers
Connector schemes don't follow the familiar consumer implementations.
How do you connect the rear surround speakers? Multichannel audio has
limited ways to reach the speakers.
Problem Owner: OS Vendors, Speaker Manufacturers
High degree of difficulty
in connecting portable devices
USB doesn't solve all the problems.
Problem Owner: OS Vendors, Device Manufacturers
Business Constraints
PCI cards do not provide a performance benefit over integrated audio
but are perceived as the "right way"
Problem Owner: Us
Upgrading the audio has
run out of streamRisers Have Not Provided Viable Audio Upgrade Strategies
- Riser card formats are not solving the PCI upgrade problem
- Risers upsell strategies for audio have not been accepted by the
OEM.
- Riser upgrades are not available to the end userNo upsell opportunity
for the OEM
Problem Owner: Riser standards groups
- No reasonable upgrade opportunity for the end user
Problem Owner: Audio up sell vendors, Riser standards groups
- Pricing constraints limit innovation and excitement
Problem Owner: Tier 1 OEMs, Audio Solution Vendors, Greenspan
- The support costs are attracting significantly more attention
Problem Owner: Greenspan, Tier 1 OEMs, OS Vendors
Music Where and When you
Want it
Even audio professionals have a hard time deciphering the multiple
audio paths, both soft and hard, and the numerous control points, all
of which interact in often unintuitive ways. This has lead to a "The
PC is hard to use" mentality.
- User cannot understand the audio flow
- Multiplicity and mutability of volume control panels
Problem Owner: OS Vendor, Audio Solution Provider, Audio Application
Vendor
- Need to boot machine laptop to play a CD
Problem Owner: Audio Solution Provider, Industry Standards Group
Audio transports are becoming
fractured
The advent of new busses carrying audio content such as USB, 1394,
Bluetooth, Ethernet, etc., has led to an environment where it is difficult
to configure and use the various audio peripherals that may be attached
or available to the PC.
- Synchronization issues between different transports
- The latency is too high, unknown, and poorly defined.
Problem Owner: Audio Solution Provider, OS Vendor, Communications
Solutions Provider (e.g. speakerphone), Audio Standards Group
Digital Rights Management
issues constrain user's ability to play music they purchased
Digital Rights Management imposes policies on PC Audio playback and
record that can prohibit a user from accessing legally obtained content.
This can make the PC an undesirable audio platform
Problem Owner: Recording Industry, OS Vendors, Audio Solutions Providers,
Tier 1 OEMs
- DRM as currently defined breaks existing S/P-DIF connections
Problem Owner: Recording Industry, OS Vendors, Audio Solutions Providers,
Tier 1 OEMs
- No way to export interactive multichannel audio over same cable
as DVD audio
Problem Owner: Core Logic Vendor, Industry Standards Group, OS Vendors
Opportunities
There are many new opportunities in the PC audio space that have come
onto the roadmap recently.
- Portable PC is being looked at as living room on the road
- Copying CDs is a huge new activity driving PC Audio awareness
- PC is gateway to portable music devices
- PC as media server
What we chose to tackle
Out of the many problems enumerated above, we chose to focus on two
primary problems, which we felt that the group could influence and potentially
solve. These issues are:
- Supporting DVD-A in the box without compromise
- Recommendations for Risers
Riser Recommendations
- DVD-A
- Competing with CE
- Continuing upgrade path
How to solve DVD-A inside
the box:
To be able to provide a good DVD-A solution inside the box, it is necessary
to provide a new bus in the PC. It was decided to name the bus the "IncuBus"
in the absence of anything better to call it at the time.
Design Criteria for new
bus
Functional Criteria
- Fully isochronous
- Audio only
- Adding other functionality (modem) greatly complicates things
- Up to 8 inputs and 8 output streams
- Have the capability to handle multiple independent audio activities
- Must have bandwidth to handle 192kHz, 32 bits
- Handle today's and tomorrow's audio formats
- No encryption in codec - for cost reasons
- Encryption dependent on rights management issues
- Flexible control mechanism
- Flexible, extensible, but well defined and behaved
- Plug and Play
- Hot plug and docking support
- Suitability for desktop, mobile, palmtop, embedded, etc.
- Must have interrupt mechanism and GPIO capability
- Docking, PnP, power management
Electrical Criteria
- Clock source driven by controller
- Subsystem needs to work as master and slave to allow for multiple
8x8 modules
- Allows extendibility for pro-sumer
- Bi-directional communications
- Needs to work with current silicon technology
- Necessary for acceptance in PC world
Next Steps
- Have a conference call on or around December 1st
- Goal: form a working group
- Bring in other parties (attendees)
- Commitment to share results with employers in trip report
- The proposed bus will require a new riser standard, which must be
industry wide
section 6 |