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SoundEasy V28 released - ANSI-CTA-2034 automatic measurements

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  • #46
    Originally posted by Shonver View Post
    Thank you, George. I would recommend considering implementing a G-code option, as that would open up other options to the DIYer community due to the myriad of CNC-based accessories available these days.
    I am not familiar with G-code. As a matter of fact, I did not do any coding, and Bohdan basically sent the command codes in the ASCII format. So he just modified some of his existing RS233 code to get it working. I just figured out how to use off-the-shelf parts as much as possible to get things working. We did look at the ARTA design, but felt we could not figure out what kind of commands they used and how complicated the coding would be. So we used our own design approach.
    Last edited by soongsc; 06-25-2022, 12:37 AM.


    • #47
      I browsed through the G code set, it seems like an added layer of coding to decouple the machine from the application. However, it is designed for the complexity of CNC manufacturing. So the commands are not so direct. I am wondering whether such complexity is necessary in just turning a table incrementally. Do they actually transmit the ASCII code?


      • #48
        Originally posted by Shonver View Post
        bohdan will you make the RS232 communications specification available, or are you making it exclusive for Soong's turntable?
        Hi Shonver,

        A number of ASCII commands are sent via RS232 link. The commands are specific for Cool Muscle motor. Some of the commands control motor state and settings, and other commands control motor movements. As you can imagine, the whole thing gets a bit complex, because the program controls everything: the MLS measurements, turntable movements and all post-processing of collected data.

        George is planning to create dual-axis turntable device, and this would make things even more complex. This would allow to conduct balloon-style measurements, but the amount of data would be very large.
        Anyway, we'll cross that bridge when we get there.

        I hope I answered your question.

        Best Regards,


        • #49
          Just getting the final touches to the single axis rig. Should be finished by Tuesday. After posting the final version (minus a built in adjustable support), the second axis and fixtures start to go on. This is going to be a challenging part. Kind of figuring things out as we go along.


          • #50
            Here is the final design of the single axis rig. Notice a few things:
            1. Added knobs for convenient adjustment.
            2. Expanded base with roller ball feet for convenient moving around. (The whole unit is about 19Kg)
            3. Wires pulling the expansion legs. This prevents the legs from moving around too much.

            The PVC cap at the center of the table is not included, as it is for a different purpose which I will show in a later post.
            Last edited by soongsc; 06-28-2022, 07:12 AM.


            • #51
              Some detail on the top.

              Click image for larger version  Name:	77C5E5C2-D6BD-4F72-9AD4-B1D08EE217B9.jpeg Views:	0 Size:	797.8 KB ID:	1487808

              The yellow circled parts will be changed to thinner stainless steel parts with countersunk bolts.
              Also note the silicon strips used to prevent slipping of speaker.


              • #52
                Here is another possible application where we are inserting a mic into the ear, and measure the response at the canal entry to simulate where an earbud sound source will be. Using a flat frequency response speaker, we can see how the head and ear may effect the response, and so when calibrating earbud response we can accomplish a more accurate presentation of sound.


                • #53
                  With this post, we are looking at a major change in the single and dual axis rig. The base expansion has been taken out replaced is a caster wheel design. This change is because we discovered readily available wheelchair caster wheels could fit the purpose quite nicely, simplified the design, while also keeping the total cost about the same. Below is our new single axis rig design with adjustable support.