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Car Forum / Driving, Maintenance, Tuning / Car Audio / April 2004Self-adjusting equalizers?
Does anyone make an equalizer that will automatically adjust its settings when connected to a real-time analyzer? I was looking at the AudioControl SA-3055 analyzer, and it has the capability to convert your car's frequency response curve to an IASCA score. If you could design an analyzer that would provide feedback to an equalizer, you could program the final response curve you want, then have the RTA analyze your current response curve and automatically send control signals to the EQ to change its settings until your in-car response matches the curve you specified, or at least as closely as possible within the limitations of the EQ. Using this method, EQ adjustments would take a matter of seconds to complete, and would be extremely nice if you had a particular response curve you wanted to match, such as the IASCA grading criteria. Scott Gardner Yeah, that would provide a real nice starting point, and wouldn't be terribly difficult to implement. (not to mention that the manufacturer would then be touting two pieces of equipment for sale instead of one). Then again, if you're running everything through a car PC and you're handy at programming...  SignatureMark remove "remove" and "spam" to reply > Does anyone make an equalizer that will automatically adjust its > settings when connected to a real-time analyzer? I was looking at the [quoted text clipped - 11 lines] > > Scott Gardner Yep, and it seems like AudioControl is only one small step away from being able to do this if they wish. Since their RTA can "grade" a response curve compared to the IASCA rules, it must have some kind of curve-fitting comparison routine built into it already, and their new digital equalizers already have a flashable EEPROM to store different EQ curves, so all that's left to add to the equalizer is a way to change the flash settings via an external connection from the RTA instead of just manual operator entries. They'd have to program the RTA with a routine to progressively change the EQ settings until the proper curve is found, but that's relatively minor. As to using a PC to do all this, I've written curve-fitting programs in the past, and the coding wouldn't be that hard. Adding an I/O box to "press" the buttons on the EQ would be tedious, but not difficult. The hardest part would be getting the RTA to output its data to the parallel port constantly, not just when you press the "print" button. The PC could handle all of the curve-fitting routines and calculate the necessary adjustments, so you wouldn't have to reprogram the RTA software except for the constant parallel port output feature. I imagine there wouldn't be a large end-user market for the RTA, but AudioControl could market it to shop owners - "Hey, you need an RTA for your shop anyway, why not buy ours that automatically adjusts our EQs?" Once the shop has the RTA, it would become very attractive for them to recommend the compatible equalizers when building a system for a customer. Scott Gardner >Yeah, that would provide a real nice starting point, and wouldn't be >terribly difficult to implement. (not to mention that the manufacturer [quoted text clipped - 18 lines] >> >> Scott Gardner > As to using a PC to do all this, I've written curve-fitting programs > in the past, and the coding wouldn't be that hard. Adding an I/O box [quoted text clipped - 4 lines] > the necessary adjustments, so you wouldn't have to reprogram the RTA > software except for the constant parallel port output feature. I was thinking more along the lines of a winamp plugin. The RTA interfaace wouldn't need to be parallel port either, and it wouldn't need to be continuously upgraded either. Just when the "test"/"adjust" phase was needed. > Does anyone make an equalizer that will automatically adjust its > settings when connected to a real-time analyzer? I was looking at the [quoted text clipped - 11 lines] > > Scott Gardner Adjust for a sound source or for the sound system? Blaupunkt and probably some other brands have self-adjusting EQs. They play tones and listen for the response on the mic. The HU I have now will even record multiple entries to represent the proper EQ setting for different seats in the car. Mic not included, of course. >> Does anyone make an equalizer that will automatically adjust its >> settings when connected to a real-time analyzer? I was looking at the [quoted text clipped - 18 lines] >will even record multiple entries to represent the proper EQ setting for >different seats in the car. Mic not included, of course. That actually sounds like what I was describing. That's cool that they basically put the RTA circuitry in the head unit, so all you have to provide is the microphone. Does it adjust the curve to some preset "ideal" response curve, or do you have some say in what the final result is? Scott Gardner > >> Does anyone make an equalizer that will automatically adjust its > >> settings when connected to a real-time analyzer? I was looking at the [quoted text clipped - 26 lines] > > Scott Gardner I'd answer if I had the mic. It only takes it a few seconds to figure out that it's missing then it aborts the configuration. I thought some of the newer Bose stock systems did this as well? SignatureMark remove "remove" and "spam" to reply > > Does anyone make an equalizer that will automatically adjust its > > settings when connected to a real-time analyzer? I was looking at the [quoted text clipped - 18 lines] > will even record multiple entries to represent the proper EQ setting for > different seats in the car. Mic not included, of course. Pioneer's 9400 and 9600 head units do this. Sends out test tones, records level, shows the analyzer. Then you can manually adjust the bands with included 13 band equalizer. Carsyn > I thought some of the newer Bose stock systems did this as well? > [quoted text clipped - 20 lines] > > will even record multiple entries to represent the proper EQ setting for > > different seats in the car. Mic not included, of course. Pioneer used to make a full din control head with a seperate "brain" that would do this. Can't recall the model number at present. > Pioneer's 9400 and 9600 head units do this. Sends out test tones, > records level, shows the analyzer. Then you can manually adjust the [quoted text clipped - 26 lines] > > > will even record multiple entries to represent the proper EQ setting for > > > different seats in the car. Mic not included, of course. > Does anyone make an equalizer that will automatically adjust its > settings when connected to a real-time analyzer? I was looking at the [quoted text clipped - 11 lines] > > Scott Gardner the old Pioneer 9200 had this feature. |
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