
16: Hardware Electric Specification, USB Serial Adapter: Use with Camcorder Option The Transmitter The transmitter has one switch, an LED indicator light, a 1/8" mini jack output, a sensor jack, a wire antenna (white) connector, and a battery compartment. The switch must be set to "On" to transmit the brainwave data. The LED will blink when a signal is being sent. Set the switch to "Off" whenever you are not using the IBVA system to record brainwaves; this will save battery power. The antenna should be unobstructed when possible and treated with care. The battery compartment slides open and the + and - positions are marked inside. The mini jack output is for recording your brainwave data to a recordable device, such as a portable cassette recorder, MD or camcorder not directly connected to an A/C power source. Never connect the transmitter to a device that is directly plugged into an A/C plug. Only connect to a device that is powered from dry cell batteries. If you intend on connecting to an A/C power source, please consult with a professional electrician to ensure that you will be isolated from the A/C power source. The sensor jack connects to the headband or optional sensor equipment. A coherence modified transmitter is two transmitters connected together for internal clock synchronization. You can put a battery in one side only, or use batteries on both sides. If you put a battery on one side, then turn the switch ON for that side's switch only. If you put batteries in both sides, then turn the switch ON for both sides. Use the exact same two batteries. That means that both batteries should be the same kind of 9 volt battery, and the age of each battery should be the same: either both new or both batteries old. Be mindful of each battery's polarity. Make sure to place the + and - of each battery properly Sensor Jack Analog Side We used special balanced DC coupling op amp, total Gain = 50,000 to 50,458. Amplifier differential impedance is 10 T ohm, Input Bias current is ¬±1.2 PA .. ¬±2 PA. 10 M ohm to 100 M ohm resistance input coupling. 0.16 Hz to 35 Hz -6 dB, 50 Hz to 60 Hz cut off -40 to -60 dB. Common mode noise is up to 110 dB at 0..40 Hz. Input Noise Voltage noise fB = 10 Hz to 10 KHz -> 0.6 ¬µ Vrms .. 0.7 ¬µVrms fB = 0.1 Hz to 10 Hz -> 1.2 ¬µ Vp-p .. 1.6 ¬µVp-p Current noise: fo = 0.1 Hz to 20 KHz -> 0.6 fA/Hz .. 0.8 fA/Hz Input Noise that depend on source impedance at 10 Hz: 100 K ohm: 50n nV/*Hz, fB = 0.1 Hz .. 10 Hz -> 1.2¬µ Vp-p Digital side 8 bit AD convertor 120 sample par second. minimum input 0 micro V p-p generate number 0. max. input 100 micro V p-p generate number 255. minimum digital resolution is 100 micro V p-p / 256 = 0.390625 micro V p-p generate number 1. Radio Frequency ch 1 is 295 MHz. ch 2 is 315 MHz (Blue Laval) IBVA transmitter's radio power is very weak, like environment radio noise in the city. It s easy to get radio transmission errors if the same frequency is broadcasting from any other location, for any reason. When this happens, we need to adjust the radio frequency that to be different from the environment's radio noise. Adjustments to the radio frequency need to be made by an electric technician. Electrode Side There is good signaling even if skin and electrode impedance changes are between 0 to 100 K ohm then 0.4 micro V p-p out put noise. This mean we can use different electrodes easily. 1/8" mini jack output We can connect to 100 to 600 ohm microphone input and/or 10K to 100K ohm line input ( about 0.1V to 1V p-p for line input ) Usually a consumer product microphone input has auto gain control. Then 1 ch recording is not a problem; however, when in 2 ch recording mode, both channels will be effected by the auto gain control circuit. So we recommend using 2 ch recording is connect to line input. The audio frequency range of 500 Hz to 13 KHz, SN up to 40 dB is needed for recording brainwaves as sound tracks. Using a 4 track sound camcorder you can record 2 ch brain wave data, 2 ch sound into the sound track, and you can record the image. Then you can play back with 2 ch brain data, 2 ch sound and image. The transmitter's 1/8" output jack allows you to relay the data from the brainwave sensors to other equipment and eventually back to the receiver's 1/8" input jack for analysis. Professional music stores carry wireless equipment that lets you connect musical devices over long distances, 1,000 to 1,500 feet. You can connect the IBVA's transmitter to the professional wireless transmitter and the output of the professional receiver to the IBVA's receiver. This will give you all the wireless freedom you could ask for! Using portable audio cassettes or MD recorders allows you to be anywhere in the world doing just about anything while recording data from the brainwave sensors for later analysis. Simply connect the output jack of the transmitter to the recording input of the cassette or MD recorder. Keep recording levels the same as you would for standard audio recording. When using video camcorders you get the added benefit of synchronizing the recording of the brainwave data with the recording of the video. Simply connect the output jack of the transmitter to the audio or microphone input of the camcorder. Keep recording levels the same as you would for standard audio recording. To play back the brainwave data from the audio or video cassette player, plug the audio output into the IBVA receiver's input jack. Remember to set the receiver's input switch to " TAPE ". If the playback device has a output level control, set it to minimum and slowly raise the volume until the receivers LED begins to blink continuously. If the recording or playback device has an automatic gain control some problems may occur with the data, especially with two channels of data. If you find that playing back into the receiver is not working, try using a recording and playback device without automatic gain control. The recording frequency range of the equipment should be between 500 Hz - 13 KHz. The input impedance of the receiver is 47 Kohms, range 300 mV - 1 Volt peak to peak. Transmitter output impedance is 5 Kohms, range 300 mV - 400 mV peak to peak. Input mini jack takes a small casing. A good routine to use when beginning to record remotely is to move the eyes around for a minute. When you play back the data into the IBVA program you can adjust the audio playback levels so the eye movement appears on the screen at normal levels. Recorded brainwaves will have more noise within the signal, depending on the quality of the recording and playback equipment. If you are having trouble playing back the data, do a test while with the computer. Record the brainwave data to the recording device through the transmitter's output jack while viewing it on the computer from the wireless connection. Stop recording and play back the data into the receiver. Compare the data you where just viewing with the recorded data. Never connect the transmitter directly or indirectly to an A/C power source. Do not plug any electrical adapter into the transmitter. Do not connect the transmitter to a device such as a cassette recorder or camcorder that is directly connected to an A/C power source. Connect the transmitter only to equipment that is powered from a dry cell battery source. The only way to use the transmitter and connected devices with A/C current is to have a medical grade isolation transformer between the A/C source and the transmitter and connected devices. If you intend on connecting to an A/C power source please consult with a professional electrician to ensure that you will be isolated from the A/C power source.

16: Hardware Electric Specification, USB Serial Adapter: Use with Camcorder Option

The Transmitter

IBVA4 Transmitter

The transmitter has one switch, an LED indicator light, a 1/8" mini jack output, a sensor jack, a wire antenna (white) connector, and a battery compartment. The switch must be set to "On" to transmit the brainwave data. The LED will blink when a signal is being sent. Set the switch to "Off" whenever you are not using the IBVA system to record brainwaves; this will save battery power. The antenna should be unobstructed when possible and treated with care. The battery compartment slides open and the + and - positions are marked inside. The mini jack output is for recording your brainwave data to a recordable device, such as a portable cassette recorder, MD or camcorder not directly connected to an A/C power source. Never connect the transmitter to a device that is directly plugged into an A/C plug. Only connect to a device that is powered from dry cell batteries. If you intend on connecting to an A/C power source, please consult with a professional electrician to ensure that you will be isolated from the A/C power source. The sensor jack connects to the headband or optional sensor equipment.

A coherence modified transmitter is two transmitters connected together for internal clock synchronization. You can put a battery in one side only, or use batteries on both sides. If you put a battery on one side, then turn the switch ON for that side's switch only. If you put batteries in both sides, then turn the switch ON for both sides. Use the exact same two batteries. That means that both batteries should be the same kind of 9 volt battery, and the age of each battery should be the same: either both new or both batteries old. Be mindful of each battery's polarity. Make sure to place the + and - of each battery properly

Sensor Jack

Analog Side

We used special balanced DC coupling op amp, total Gain = 50,000 to 50,458.
Amplifier differential impedance is 10 T ohm,
Input Bias current is ¬±1.2 PA .. ¬±2 PA.
10 M ohm to 100 M ohm resistance input coupling.
0.16 Hz to 35 Hz -6 dB, 50 Hz to 60 Hz cut off -40 to -60 dB.
Common mode noise is up to 110 dB at 0..40 Hz.

Input Noise

Voltage noise

fB = 10 Hz to 10 KHz -> 0.6 ¬µ Vrms .. 0.7 ¬µVrms
fB = 0.1 Hz to 10 Hz -> 1.2 ¬µ Vp-p .. 1.6 ¬µVp-p
Current noise:
fo = 0.1 Hz to 20 KHz -> 0.6 fA/*Hz .. 0.8 fA/*Hz
Input Noise that depend on source impedance at 10 Hz:
100 K ohm: 50n nV/*Hz, fB = 0.1 Hz .. 10 Hz -> 1.2¬µ Vp-p

Digital side

8 bit AD convertor 120 sample par second.
minimum input 0 micro V p-p generate number 0.
max. input 100 micro V p-p generate number 255.
minimum digital resolution is 100 micro V p-p / 256 = 0.390625 micro V p-p generate number 1.

Radio Frequency

ch 1 is 295 MHz.
ch 2 is 315 MHz (Blue Laval)
IBVA transmitter's radio power is very weak, like environment radio noise in the city. It s easy to get radio transmission errors if the same frequency is broadcasting from any other location, for any reason. When this happens, we need to adjust the radio frequency that to be different from the environment's radio noise. Adjustments to the radio frequency need to be made by an electric technician.

Electrode Side

There is good signaling even if skin and electrode impedance changes are between 0 to 100 K ohm then 0.4 micro V p-p out put noise. This mean we can use different electrodes easily.

1/8" mini jack output

We can connect to 100 to 600 ohm microphone input and/or 10K to 100K ohm line input ( about 0.1V to 1V p-p for line input )
Usually a consumer product microphone input has auto gain control. Then 1 ch recording is not a problem; however, when in 2 ch recording mode, both channels will be effected by the auto gain control circuit. So we recommend using 2 ch recording is connect to line input.
The audio frequency range of 500 Hz to 13 KHz, SN up to 40 dB is needed for recording brainwaves as sound tracks.
Using a 4 track sound camcorder you can record 2 ch brain wave data, 2 ch sound into the sound track, and you can record the image.
Then you can play back with 2 ch brain data, 2 ch sound and image.
The transmitter's 1/8" output jack allows you to relay the data from the brainwave sensors to other equipment and eventually back to the receiver's 1/8" input jack for analysis.

Professional music stores carry wireless equipment that lets you connect musical devices over long distances, 1,000 to 1,500 feet. You can connect the IBVA's transmitter to the professional wireless transmitter and the output of the professional receiver to the IBVA's receiver. This will give you all the wireless freedom you could ask for!

Using portable audio cassettes or MD recorders allows you to be anywhere in the world doing just about anything while recording data from the brainwave sensors for later analysis. Simply connect the output jack of the transmitter to the recording input of the cassette or MD recorder. Keep recording levels the same as you would for standard audio recording.

When using video camcorders you get the added benefit of synchronizing the recording of the brainwave data with the recording of the video. Simply connect the output jack of the transmitter to the audio or microphone input of the camcorder. Keep recording levels the same as you would for standard audio recording.

To play back the brainwave data from the audio or video cassette player, plug the audio output into the IBVA receiver's input jack. Remember to set the receiver's input switch to " TAPE ". If the playback device has a output level control, set it to minimum and slowly raise the volume until the receivers LED begins to blink continuously. If the recording or playback device has an automatic gain control some problems may occur with the data, especially with two channels of data. If you find that playing back into the receiver is not working, try using a recording and playback device without automatic gain control. The recording frequency range of the equipment should be between 500 Hz - 13 KHz. The input impedance of the receiver is 47 Kohms, range 300 mV - 1 Volt peak to peak. Transmitter output impedance is 5 Kohms, range 300 mV - 400 mV peak to peak. Input mini jack takes a small casing.

A good routine to use when beginning to record remotely is to move the eyes around for a minute. When you play back the data into the IBVA program you can adjust the audio playback levels so the eye movement appears on the screen at normal levels.

Recorded brainwaves will have more noise within the signal, depending on the quality of the recording and playback equipment. If you are having trouble playing back the data, do a test while with the computer. Record the brainwave data to the recording device through the transmitter's output jack while viewing it on the computer from the wireless connection. Stop recording and play back the data into the receiver. Compare the data you where just viewing with the recorded data.

Never connect the transmitter directly or indirectly to an A/C power source. Do not plug any electrical adapter into the transmitter. Do not connect the transmitter to a device such as a cassette recorder or camcorder that is directly connected to an A/C power source. Connect the transmitter only to equipment that is powered from a dry cell battery source. The only way to use the transmitter and connected devices with A/C current is to have a medical grade isolation transformer between the A/C source and the transmitter and connected devices. If you intend on connecting to an A/C power source please consult with a professional electrician to ensure that you will be isolated from the A/C power source.