Browse Prior Art Database

Programmable Computer Stereo System for Multi-Media Systems

IP.com Disclosure Number: IPCOM000108616D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 4 page(s) / 154K

Publishing Venue

IBM

Related People

Kerins, TM: AUTHOR [+2]

Abstract

Described is a programmable computer stereo system (CSS) designed to integrate an internal high fidelity stereo speaker system to a personal computer (PC) so as to function in multi-media applications.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Programmable Computer Stereo System for Multi-Media Systems

       Described is a programmable computer stereo system (CSS)
designed to integrate an internal high fidelity stereo speaker system
to a personal computer (PC) so as to function in multi-media
applications.

      The programmable CSS is capable of receiving digital and/or
analog input signals and to process, mix and steer the signals to
appropriate stereo speakers.  Functions, such as volume control,
balance, dynamic equalization, re-verberation, three-dimensional
quadrophonics (quad), and other special effects, can be programmed
and controlled by way of the small computer system integrated (SCSI)
interface.  Various sound decompression algorithms can be supported
as well as various modes of operation, such as monophonic, stereo,
single channel only and mute.

      Typically, multi-media computer systems utilize direct access
storage devices (DASD), such as compact disc read-only memory
(CD-ROM) devices, and optional circuitry to provide various methods
for digitally processing sound and/or converting the signals to
analog audio for outputting to external power amplifier/speaker
systems.  The internal speaker system, generally installed in PC
systems, does not provide stereo capability and does not have the
power or quality needed to reproduce the high fidelity sound required
for multi-media applications.

      The concept described herein provides an implementation for
integrating a high fidelity stereo speaker system internal to the
computer.  This eliminates the need for external amplifiers, cables
and speakers and reduces space requirements since the system is fully
self- contained.  The system is designed to conform to any available
DASD form factor, such as 5.25" full height, 5.25" half height, and
3.5" compact size, and can be used on any system which has an
available SCSI DASD slot in the PC system unit.  Also, it can be used
in conjunction with multi-media options, such as CDROM, audio
capture/playback and other devices.

      So as to match and complement multi-media capabilities, the
concept avoids any duplication of function by providing several
versions.  Some of the versions are as follows:
       .  Analog sound only, manual control only
       .  Analog sound input only, software and manual control
       .  Analog and digital sound input, basic sound control using
software
       .  Analog and digital sound input, full capability sound
control and enhancement by way of digital signal processing

      Fig. 1 shows a block diagram of a functional CSS.  The three
basic CSS blocks are described as follows:
      1) SCSI interface - A standard SCSI interface is provided using
standard commands where possible and user unique co...