This unit uses special circuitry to read PCM (Pulse Code Modulation) signals with very high accuracy. With the NTSC mode VCR, it is possible to perform PCM recording and playback in the "Extended Play Mode", delivering quality PCM recording no different from "Standard Mode" PCM recording/playback. Thus, when PCM recording/playback is performed over a long period of time, the tape running cost-effectiveness is greatly improved.
FRONT PANEL INFORMATION:
REAR PANEL INFORMATION:
NOTES REGARDING CONNECTION:
CONNECTION WITH VCR
Connection between the Neuro-Corder and the VCR should be made as follows:
| CONNECTION TABLE | |
| DR-484 Connection | VCR Connection |
| Video-Out | Video-In |
| Video-In | Video-Out |
| Audio-Out | Audio-In |
| Audio-In | Audio-Out |
In the same way as when performing picture playback, if there is a VCR tracking error, good NEURO-CORDER playback cannot be achieved. When the same VCR is used for recording and playback, there is generally little problem, but in other cases, dropout, etc., may be increased. In order to achieve the best possible NEURO-CORDER playback, perform VCR tracking adjustment in the following steps:
TRIGGER OPERATION:
External (NORMAL) and MANUAL TRIGGER input can be selected by toggle switch. When trigger signal is received, the LED lamp bs and 5 volt positive going pulse comes out from the TRIGGER OUT BNC terminal.
(EXTERNAL) TRIGGER IN accepts a 3 - 20 volt positive going pulse for the trigger signal.
Between TRIGGER IN and OUT timing, there might be some delay time depending on when the trigger signal arrives. During recording, the trigger signals are digitized and always stored in the channel one data information. Therefore during four channel mode operation, the worst trigger in/out delay time should be about 46 usec (1/22kHz).
| CHANNEL MODE | TRIGGER IN/OUT DELAY |
| 2 Channel | 0-23 usec |
| 4 Channel | 0-46 usec |
In order to match the recorded data and stimulation (etc.) timing, use the TRIGGER OUT to synchronize your stimulator (etc.).
TRIGGER MARKING:
Incoming triggers are marked
sequentially. You can set starting trigger number with
TRIGGER NUMBER INPUT KEYS:
CLEAR - Reset numbers.
UP - Increment number.
DOWN - Decrement number.
FAST & UP or FAST & DOWN - Increase
speed of increment or decrement of number setting.
Set number is displayed on TRIGGER MARKER NUMBER window.
MEMORY CONTROL:
The MEMORY CONTROL is a unique function of this digitizing unit. During RECORD mode, this serves as the WAVE SAVER or the DIGITAL OSCILLOSCOPE function.
When it is on PLAYBACK mode, this memory accepts playback data information followed by the recorded trigger or external/manual trigger.
Total memory is 16K samples.
Two channel mode 8K/channel
Four channel mode 4K/channel
VIEW toggle switch selects viewing of MEMORY output and direct TAPE output.
MEMORY STORAGE TIME BIN CONTROL (STORE EVERY) switch: By setting to one, you can STORE EVERY sampled time bin. By setting to two, you can store every other sampled time bin, and so on.
| CHANNELS | STORE EVERY | SAMPLING FREQ (kHz) |
| 2 | 1 | 44 |
| 2 | 22 | |
| 4 | 11 | |
| 8 | 5.5 | |
| 4 | 1 | 22 |
| 2 | 11 | |
| 4 | 5.5 | |
| 8 | 2.75 |
DATA memory storage starts after the recorded or external trigger information is received. Trigger source can be selected by toggle switch. INTERNAL means recorded trigger.
The memory can be written only one time or rewritten every time a trigger is received. For single frame grabbing, push reset switch (ENABLE light will come on.) and wait until triggered. Any trigger number which is read back from the tape will display on the TRIGGER MARKER NUMBER window.
AUDIO MONITOR:
During recording if you experience microphone oscillation, please turn down speaker volume.
Mailing Address: |
 All pages contained within are Copyright of Cygnus Technology, 1997 Last Modified 02/19/97 |