iMn Multi-Function Interface
The iM5, iM7, iM8, iM9, iM14, and iM15 have specialized I/O functions,
including advanced audio processing critical for auditory behavioral experiments.
- Drive a speaker (e.g. MF1) directly up to 4W via an RCA connection.
- Record cage sounds via an embedded microphone amplifier.
- Connect with many common cage elements (e.g. touch sensors) via BNC ADC inputs and DAC outputs.
- Generate AM and FM stimulation (excludes iM10)
* The +28 V logic includes four output bits and four input bits.
See the Hardware Manual for information on iMn technical specifications.
iMn Options
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| iM8 Interface |
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| iM15 Interface |
The Mic/Spk Amp setting lets you optionally enable the ⅛" jack to use for Analog Inputs 1 and 2 (if available). It also adds 56.6 dB, 66.6 dB, or 76.6 dB gain to the input, and set Attack/Release ratios of 1:500, 1:2000, or 1:4000.
Important
Do not connect anything to the BNC ADC input(s) when the microphone amp is enabled.
The Biasing setting lets you optionally adjust the input impedance and bias voltage on Analog Inputs 1 and 2 (if available).
The Medusa setting (iM7 and iM8 only) sets the number of channels to read from the Medusa preamplifier port (0-4).
The iM14 and iM15 modules have a DB15 port that connects to an iHm manifold. There are four +28 V outputs (HvOut1-HvOut4) that map to 1-4 on the manifold and four +28 V inputs (HvIn1-HvIn4) that map to 5-8 on the manifold.
All iMn inputs go through an input processor. Analog signals are first converted into TTL logic signals using the methods described below, and then pass through a logic processor. See iMn Input Processor for more details and a diagram of the complete process for the iMn analog inputs.
Analog Inputs
Logic
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| iM5 Logic Input Options |
Input signal above ~1.5 V triggers the logic input.
Example
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| iM5 Raw Input Signal and Logic Threshold Crossing |
Signals above ~1.5 V trigger the Micn epoc store. As with all iCon input epoc events,
a value of 3 is saved on the Rising edge and a value of 4 is saved on the Falling
edge.
The rest of the processing is handled by the Logic Input Processor.
Simple
Use the Simple option if you want to add gain to the analog input signal and manually set a threshold.
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| iM15 Simple Input Options |
Note
These settings are adjustable in the run-time interface
If threshold is positive, the lower threshold is (Thresh % - Hyst %).
Example
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| iM15 Raw Input Signal and Simple Threshold Crossing |
Thresh is 20% and Hyst is 15%. The input logic is true when the signal crosses above 20% of the input range (20% of 5 V = 1 V) and false when the signal goes below 5% of the input range (0.25 V).
If threshold is negative, the lower threshold is (Thresh + Hyst).
Example
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| iM15 Raw Input Signal and Simple Threshold Crossing |
Thresh is -20% and Hyst is 15%. The input logic is true when the signal crosses below -20% of the input range (-20% of 5 V = -1 V) and false when the signal goes above -5% of the input range (-0.25 V).
The rest of the processing is handled by the Logic Input Processor.
Complex
The iMn processor runs at 400 kHz, independent of the RZ / iConZ sampling rate. Use the Complex options to significantly increase fidelity in the frequency range you are interested in by reducing the input bandwidth. You can also apply non-linear operations such as absolute value, square, flip the signal sign, or add smoothing.
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| iM15 Complex Input Options |
Note
All settings except for Frequency Range and Operation are adjustable in the
run-time interface.
See Simple processing options for a description of the rest of the settings and thresholding examples.
The rest of the processing is handled by the Logic Input Processor.
Clip Detect
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| iM15 Clip Detect Input Options |
Triggers when signal is within ~3% of the 5 V input range (signal is greater than approximately ±4.8 V).
The rest of the processing is handled by the Logic Input Processor.
Touch Inputs
Touch sensor inputs are available on the iM8, iM9, and iM15 only. All touch sensor inputs are handled by the Logic Input Processor.
Analog Outputs
All iMn outputs first go through a logical output processor that controls when the output is presented. See Logic Output Processor for more details.
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| iM9 Output Options |
^ For audio applications, set Freq Resolution to 10 Hz or 100 Hz only for best results.
+ For precision control applications, use PWM instead