US1469561A - Signal recording and transcribing method and apparatus - Google Patents

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M. R. HUTCHISON SIGNAL REcoRDING AND TRANSGRIBING METHOD AND APPARATUS Original yFiled Jan. 21

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Patented Oct. 2, 1923.

"UNrrED, [STATES PATENT OFFICE.

MILLERdBEESE HUTCISGN, 0F WEST ORANGE, NEW JERSEY.

passation nica xanaaryai, i920, smal No. 352,921.

Y Be Vit. knownY Vthat MILLER Raices Hrrromsoiv, a Acitizen ofi Vthe United States, and-residentof Vest Orange, inV the county 'of Essex and State` of New Jersey, have invented certain new and useful Improvements in SignalV Recording and lTranscribing Methods and Apparatus, of which the following isa specification.A Y Y Y Y l present invention relates more ,particularl. to the recordingand transcribing of wire ess telegraph messages, although, it may be nseully einployedY Vtor-e other signals sent .by'other methofils.V Y

According Vto present day practice, it is Ecommon to have Vthe wireless transmitting apparatus generate YosciIl-ations andv radiate waves of high fr uency, .say 36,000 cycles er second. Such requencies are above the imit of practical audibility and it isccmmonto have the waves generated intermittently inrapidy succeeding groups of wave trains One meansfofedoing'this is Yto have a rotary;Y electrode .for the Yspark gap so :that dischargeV of; theV oscillatory circuit is precipitatedwat EAthe desiredI rate,: say 320 times per second. Each oscillatory discharge gives rise to a train .ofA sayV 7d or 80 Waves of the` 36,000 fresia@1.163?,Y So that reach Wave train lasts about Ytvvo=thirds of the interval between discharges.vv These trains; following eachother at y:therate of 320 perfsccende are translated@ therewiting apparatnsin such vmanner Ythat' they are heardfas notes havin Yaz'pfitch of 320 per second, continuing a s ort time Jfor the dots and a longer time for the dashes.

4liirelessK sendingY stations are VYnow Y able through improvements in the sending apparatus, to transmit at a rate much faster than ythe receiving operator can transcribe. Consequently, :it hasbeengproposed to record the notes con:dirai-tingV -receivedsignala on record, rotated at ashigh a rateoffspe'ed .as *will permit oigood recording, and then transcribe themrrfrom said record when vrotating it in the reproducer at as low avrfspeed, encheres will give' good reproduced sounds.Y Y

i There Yis:ino;lmfrticnilarYdifficulty in such by the slow @ing good audibilit Say SIGNAL RECORDING AND TBANSCRIBING METHOD AND APPARATUS.

Renewed vAugust 7, 1923.

cuit that ordinarily connects with the head setof the operator is merely connected toa magnet which actuates the recording jewel of' a cylinder phonograph which is revolving at a rate of say 125 revolutions per minute, therebyrecording the intermittent 320 pitch note which represents the dots and dashes. Nor is thereV any great diiculty in reproducing and transcribing from such record at a considerably lower speed.

It has been found, however, that ifthe messages Yare sentat a very high rate say V100. Words per minute, Vwhich is possible with the improved sending apparatus now available, the speed of theA reproducing phonograph would have to ,be` reduced to say 30 revolutions per minute in order to reach the desired transcribing speed of 25 Words perminuta.` The result is not satisfactory because such reduction in speed reduces the pitch of the note to 80 vibrations per second With the result that the signal sounds as a `gutteral grunt, easily confused With the Yinherent phonograph scratches and with the noises due to static or atmospheric disturbances which are recorded with the signals.

In order to meet thesevconditions and to enable the phonographic method of recording and transcribing to be practiced at such high rates of signalingas the sending station may be capable of transmitting, my 1nvvention contemplatesv employing means at the receiving station to break up each of the received Vvvave trains l.into much smaller lengths, so that the note in the receiving Y,

instrument will be of much higher pitch. This pitch will be proportioned to the speed of .sending and to the desired rate VVof transcribing so that, after recording Vat a speed not too highfor good recording and after the pitch of the ngte has been reduced speed requlred for eifective res producingand transcrlbing, the note in the reproducer will still rbe, of a frequency givtwo to three hundred per second. or instance, if 100 Words per minute are being sent and ii Lheoperator Vcan transcribe at 25 words per mlnute, the interruptions may be such as to produce inthe recorder,

a note of say 1000.0r

the indicating instrument a note, the pitch of which is the same multlple of a good audible pitch, that the word-per-minute of the sending station is multiple of a pra/ctical transcribing rate.

Any known or desired means may be used for generating, transmitting and receiving the signal impulses; any desired means may be employed for sending the signals at the desired high words-perminute rate; and any desired means may be employed for breaking up the battery uctuations into the required shorter, higher-pitch fluctuations.

I claim:

In the art of signalling by electromagnetic waves, the method which consists 1n radiating` trains of waves broken by and in accordance with the dots and dashes of the signal to be sent, said dots and dashes representing the signal being transmitted at a rate several times the rate at which they can be transcribed by an operator at the `receiving station; intercepting said waves at a receiving station and interrupting the received wave trains representing the dots and dashes to produce shorter signal elements corresponding to a. note of predetermined pitch at least three times as high as re uired for phonographic reproduction; uti izing the thus broken wave trains to produce fluctuations in a battery current corresponding to long and short notes of a frequenc equal to that of said breaks; utilizing said uctuations to cut undulations in a phonograph record; and reproducing the long and short notes representing the dots `and dashes, at speeds approximately one-third the recordin speed.

gned at New York city, in the county of New York and State of New York, this 20th day of January, A. D. 1920.

MILLER REESE HUTCHISON.

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