The trans-demodulative process

Some speculations concerning the trans-demodulative (TDM) process during an EVP recording

At first we can completely omit the possibility that TDM might occur merely in the electronical part (amplifier) of a tape-recorder. If so would be the case, so it would be possible to get an immediate response of the incoming signal by monitoring the output signal from the recording amp. Thus we have to take a look to the other processes concerning the tape itself. The magnetic tape is coated with a thin layer of very small magnetic crystals (ferro-magnetic dipoles) which on an empty (not recorded) tape are randomly oriented. When listening to such an empty tape, we can hear only a hissing noise (white noise = random noise).

During the recording process there are two signals present (without any external input signal in this idle mode) at the recording head:
1. the pre magnetizing biasing signal in the RF range (ca. 100 kHz)
2. the weak noise originating in the rec. amplifier (1/f, current-, voltage- and thermal noises)
As we now can see, there seems to be much randomity within the recording event and it is already known that randomness is a psi-sensitive property! (micro PK )

By now we still do not know what exactly happens in the TDM, but at least we now are in some amount able to point out the rather obvious detail (rec.head and tape) where this process takes place.

There is one possibility to get almost immediate signal response by using double heads: one for recording and the other for play-back. There are tape recorders with this property. The delay between input and output signals may at the best be only some milli seconds. This possibility should be strongly pondered!

Please, let me hear your comments!
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Martti Walden
[martti.walden@luukku.com]
26.6. 2001 Turku - Finland