US1818006A - Method of making and playing phonograph or sound records - Google Patents

Description

H. OHAGEN Aug. 11, 1931.

Filed April 2. 1928 rammed Aug. 11, 1931 UNITED STA TES- HEINRICH OHAGEN, OF BRESLAU, GERMANY METHOD Oi MAKING AND PLAYING PHONOGRAPH OB SOUND RECORDS Application filed April 2, 1928, Serial No.-266,747, and in Germany April 6, 1927.

The new method has for its object to make inaudible all intraneous noises which are transmitted onto the diaphragm by the slidmg of the sound-box needle over the sound plate.

p In the commonly used talking-machines intraneous noises are produced by the needle sliding on the sound-plate, which reach the ear in part directly and which are in part 19 transmitted by the diaphragm.

'The intraneous noises reaching the ear directly may be made inaudible by covering the apparatus, but not those transmitted by the diaphragm.

- These intraneous noises are very disturbing at soft tones and at the softest piano and also i( luring the intervals in the musical composiion.

The disturbing intraneous noises of the 0 needle dlsappear for the hearing at loud tones of the composition. By the new method all disturbing intraneous noises of the needle transmitted by the diaphragm are made to disappear even at the soft tones, at the Softm a muslcal com osition.

The disappearing of the intraneous noises cal tones free from disturbance and of the needle-noise still existing in the intervals of the musical composition, is deadened on the talking-machine by suitable deadenino measures, and in order to ensure the full final cffeet deadened at least so far that also the est piano and during the intervals of silence free needle-noise not covered, by any musical tones and still existing in the intervals in. the musical composition, the sound-strength of which is below the tone strength of the musical composition, becomes inaudible.

Fig. l is a diagram showing the usual relation of the volume of sound of intraneous noises to the volume of sound of a musical composition. p

Fig. 2 shows this relation according to the present invention. f

At the recording of a musical composition in a tone-strength as described above the engraving stylus oscillates sometimes so much in lateral directions that the sound-grooves merge the one in the other. This inconvenience is obviated by making the spiral-lines engraved by the stylus at a greater distance the one from the other. The reproduction of'a musical composition or the like without any disturbing noises of the sound-box needle is consequently obtained. By further deadening the musical composition, which is now clean, can be brought to the normal or any desired tone-strength agreeable for the ear.

In the accompanying drawings two diagrams are shown, of which that in r Fig. 1 shows the sound strength curves 0 the intraneous noises caused by the needle of the sound-box' and further the tone strength curve of the musical composition with the 1 intervals in said musical composition. and the deadening curve below which tones or noises are not heard anymore, and how these curves are relatively situated according to the pres ent methods, whilst the diagram shown in Fig. 2 represents the mutual position of these three tone or souiid-strengthsand deadeningeurves according to the new method.

Tn Fig. 1 A A is the curve of the strength of the sound produced by the sound-boxneedle through the intermediary of the diaphragm and a b, c (l c and f, g are the tonestrength curves of the musical composition,

b and 6 f representing the intervals in the musical composition. he is the deadening curve below which sounds and noises are not audible anymore.

On the stretch a b, c d, which corresponds to the softest piano or to a soft tone, the tonestrength of the musical composition is below the strength of the needle-noise and on these stretches as well as on the stretches b 0 and f which represent the intervals in the musical composition, the intraneous noises are disagreeably audible. On the stretches (Z c and f g the tone-strength of the musical composition is above the sound-strength of the intraneous noises of the needle and these intraneous noises disappear for the ear.

The deadening curve h i comes in this case When the musical composition has been recorded in such tone-strength that at the play ing of the sound-plate the tone-strength of the finest tones of the musical composition is greater than the continually equal soundstrength of the intraneous noises of the needle, the tone-strength-curve a b, c d e f g turbance Fig. 2 a 6, 0d 6, f g, the needlenoise is audible only in the intervals in the musical composition, Fig. 2 Z2 c and e f is deadened in any convenient manner to normal tone-strength or to a tone-strength agreeable to the ear, at least however to slightly above the sound-curve A A Fig. 2 of the sound-box-needle, the needle-noise becomes also inaudible in the intervals of the musical composition, Fig. 2 b 0 e, and f whilst the I sound-strength curves of the needle-noise and the tone-strength curve of the musical com-- position preserve their mutual positions.

At the clean souncl-eiiect of the musical composition there is no longer audible any disturbing needle-noise.

I claim I 1. A methodfor eliminating intraneous noises from the reproduction of sounds on talking machines, consisting in the production of the record at a higher tone volume so that the softest piano of the composition rendered is louder than the intraneous noises, and in damping the volume of sound when producing a second record so that the intraneous noises become inaudible.

2. A method for eliminating intraneous noises from the reproduction of sounds on talking machines, consistin' in the production of the record at a hi er tone volume so that the softest piano 0 the composition rendered is louder than the intraneous noises, and in damping the volume of sound when using the record directly on the record untll an agreeable intensity of sound is obtained and the intraneous noises are inaudible.

In testimonywhereof I afiix my signature.

HEINRICH OHAGEN.

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