Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Using Low Cost Audio-CD Drive for the PC Sound Source Device

IP.com Disclosure Number: IPCOM000113313D
Original Publication Date: 1994-Aug-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Funatogawa, K: AUTHOR [+2]

Abstract

This article describes the method of quick sound operation by using the low cost Audio-CD drive and the sound (generation) chip.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Using Low Cost Audio-CD Drive for the PC Sound Source Device

      This article describes the method of quick sound operation by
using the low cost Audio-CD drive and the sound (generation) chip.

      The access speed of the Audio-CD drive is very slow.  It is
necessary 1 o r 2 second to start a sound after select the sound
track.  Therefore, the Audio-CD drive can not be used for the PC
sound source device generally.

      This article propose two examples of filling up the above blank
period by utilizing the sound chip, synchronization and switching
mechanism as follows.  The sound chip have to generate the
corresponding sound to the synchronization point until coming the
sound from the Audio-CD drive.

Fig. 1 shows the synchronization by using an INDEX DATA from the
Audio-CD Drive

    Select the sound track in Audio-CD and start the sound from the
    sound chip (Switch : connect to the sound chip line)

switch to the Audio-CD drive line when the INDEX Data comes from
    the Audio-CD

Fig. 2 shows the synchronization by using an analog integrate
circuit.

1.  Select the sound track in Audio-CD and start the sound from the
    sound chip (Switch : connect to the sound chip line)

2.  Switch to the Audio-CD drive line when the analog integrated
    value exceeds a threshold

Both of the Audio-CD drive and the sound chip are controlled by a
series of a software.