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(Topic ID: 79721)

Are new Stern pins in Stereo or not?


By Part_3

6 years ago



Topic Stats

  • 115 posts
  • 35 Pinsiders participating
  • Latest reply 3 years ago by kermit24
  • Topic is favorited by 2 Pinsiders

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    #68 6 years ago
    Quoted from Crash:

    SAM games use 24KHz ADPCM

    Some tracks are using a proprietary ADPCM format. This format has a fixed 4x compression rate.

    #75 6 years ago
    Quoted from Part_3:

    I've heard people grumbling about Stern's pinball audio not being in stereo, but when I look back at Data East pins from the early 90's they claim to have stereo sound. Surely, Stern didn't downgrade to mono over the years?

    In fact, Stern pinballs that are based on SAM boards ARE stereo :
    - The audio DAC is a PCM1755 and it supports stereo
    - The SAM pcb has 2 channels on the J10 connector; each one is driving a different speaker
    See schematics below.

    So, I guess we could enable stereo... it's just a question of software.
    Do you think it would be interesting to add this feature with Pinball Browser ?

    AudioSch.png
    AudioPanel.png

    #105 6 years ago
    Quoted from malcor:

    The schematic of the speaker panel assy shows the speakers being wired as mono. So the two channels on connector J10 are probably used to separately drive the cabinet and back box speakers.

    You are right.
    One channel for the 2 front speakers, and one for the bottom speaker :

    AudioSch2.png

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