US2804500A

US2804500A - Color interpretation system

Info

Publication number: US2804500A
Application number: US383480A
Authority: US
Inventors: Lawrence J Giacoletto
Original assignee: RCA Corp
Current assignee: RCA Corp
Priority date: 1953-10-01
Filing date: 1953-10-01
Publication date: 1957-08-27
Anticipated expiration: 1974-08-27

Description

Aug. 27, 1957 L.. J. GlAcoLETTo 2,804,500

coLoR INTERPRETATION SYSTEM Filed oct. 1, 195s 2 sheets-sheet 1 USR. w S mm ,auf E J. w a NQ i .w BMIIIIJHL N o mmf D NN UQ. L: T m -d 5mm@ ,WN N N .Qylm \L *www IIi-- INN N w Im @www N. \\\V\\ A TTOR NE Y Aug. 27, 1957 L. J. GxAcoLETTo coLoR INTERPRETATION SYSTEM 2 Sheets-Sheet 2 Filed 001'.. l, 1953 k NLS IN VEN TOR.

TTORNEY Unite States listen Patented Ang. 27, 1957 assess@ Cerca mrnnrnnrarron srsrnrvr Lawrence J. Giacoletto, Princeton Junction, N. J., assigner to Radio Corporation of America, a c-orporatmn et Delaware Application October 1, 1953, Serial No. SSSASG il Ciaims. (Cl. 179-14@ My invention relates to a system for the visual portrayal and interpretation of sound and in particular to a system for converting music into colored geometric patterns.

Systems have been devised for interpreting sound, especially music in terms of color. The development of such systems has been a natural result of a long standing recognition that sounds are peculiarly susceptible to portrayal and interpretation by the many known shades and tones of color. Thus, for example, footlights and spotlights consisting of multifarious colors have been used in dramatic and musical productions for many years. This fact, of course, is a recognition that the artistic eliect of such productions is considerably enhanced by the changing color compositions of the scenes. As a result of this recognition, systems have been proposed to coordinate the two effects into an audible and visual unit, the two effects combined serving to complement and augment each other producing a unified response which is superior and more eiective than either effect alone.

The systems proposed in the past for correlating light and sound usually resolve themselves into devices whereby the sounds of a phonograph or any other sound reproducer are coordinated with a bank of many colored lights. The lamps are usually selected and controlled in accordance with either the frequency or amplitude characteristics of the sound energy from the reproducer, or both. Thus different colored lights may be selected in accordance with the sound frequency and the intensity of those selected may be varied in accordance with the sound intensity.

Such a system is disclosed and claimed in a patent to E. B. Patterson, No. 1,977,997. In accordance with the Patterson invention, sound from any suitable source is converted into an electric current which is amplified and then separated into distinct bands of frequency by a series of electrical frequency selective filters. The filtered currents are used to control the intensity of a plurality of banks of colored lights, each bank being of a different color.

Heretofore, when it was desired to change the geometric pattern of any illuminated area, it has been the practice to use revolving masks or diffusing crystals placed between the illuminated area and the light source. A very pleasing effect may be obtained if the color pattern is directly related to the audio content of the source, and wherein the patterns produced follow, in rapid sequence, the changes in the sound.

It is, therefore, an object of my invention to provide means for interpreting sound, and more particularly, music, in terms of a rapidly changing color pattern whose eometrical form and content are intimately related to the sound input.

Also, it is an aim of my invention to provide means, in a system for visually interpreting sound, whereby a color pattern is directly related to the audio content of the source and in which the pattern produced will follow the rapid changes in audio content.

A further purpose of my invention is to provide an improved system of the general type described in which moving mechanical parts are eliminated.

A still further object of my invention is to provide a novel system of the type under consideration which may be incorporated easily into a standard color television set.

In accordance with my invention means are provided whereby electric currents representing sound waves, are divided into frequency bands by means of suitable filtering devices. The currents representative of each band of frequencies are fed into separate paths and individually applied to the control electrodes of separate color cathode ray tubes or the different control electrodes of a single tri-color tube. Switching means are provided to change the input, which may be either video, audio, or rectified audio, to the various control electrodes in accordance with the wishes of the observer. In this manner, for programs consisting of both sound and pictures, where the picture may not be of interest, the viewer can switch from picture reception to a changing color portrayal or interpretation of the sound.

The above, and other objects, aims, and purposes of my invention are accomplished by the structures and arrangements set forth in the following detailed description of my invention when taken in connection with the accompanying drawings, in which:

Fig. l is a schematic representation of one embodiment of my invention;

Figs. 2, 3 and 4 are approximate representations of the picture on the face of the kinescope as used with the arrangement of Fig. l for diiterent input sound conditions;

Fig. 5 is an approximate representation of the picture on the face of the kinescope or on an image screen for a condition wherein the geometric pattern is present; and

Fig. 6 is a schematic representation of another embodiment of my invention.

Referring in detail to the drawings, and in particular to Fig. l, a simplified representation of one type of tricolor kinescope is indicated by the numeral 1. A tricolor kinescope 1 suitable for employment in the practice of this invention has been well shown and described in an article entitled A three-gun shadow-mask color kinescope appearing in Part II of the RCA Review for September 1951 at page 466, et seq. The kinescope l has three cathodes 2, 3 and 4 and three corresponding control electrodes 5, 6 and 7. The electrodes 2, 3 and 4 control the intensity of the three electron beams produced by the respective cathodes and the electron gun structures. As the potential on these control electrodes 2, 3 and 4 becomes more negative, fewer electrons will be drawn from the space charge adjacent to the cathodes.

The beams are defiected by any known method such as electrostatic or magnetic means. In Figure l a set of magnetic defiecting coils 9 and 1t) is illustrated. The coils 9 and 1t? exert a magnetic force on the electron beams so that when they emerge from the magnetic field, they have been deflected from their original direction. Each of the three electron beams may have its intensity controlled in accordance with signals from a transducer which converts the intensity of a particular color into corresponding voltage variations.

For the purposes of this invention, any colors may be used but red, blue and green will be chosen as examples. Thus, in Figure l, the cathode corresponding to the red beam is indicated by the numeral 2, the cathode for the green beam by the numeral 3 and the cathode for the blue beam by the numeral 4 The beams strike a cathodoluminescent phosphor screen i2. composed of a regular array of red, green and biue emitting phosphor dots or 3 strips which are placed on the interior surface of the transparent plate 8 of the kinescope 1.

If the dot form of target or screen is employed, the dots on the glass plate 8 are closely spaced in groups of three so that the center of a dot of each of the three colors is located at each apex or corner of an equilateral triangle. A perforated metal. sheet 13 commonly known as a shadow mask is located in front of the phosphor screen 12 for partially masking the electron beams. The shadow mask 13 is so spaced with respect to the gun and the phosphor dots, and has such geometrical properties that the electron beam corresponding to the red components strikes only those phosphor dots which are red emitting. The shadow mask 13 also insures that the electronbeams for green and blue strike only green and bluephosphors respectively. Thus the shadow mask in fact provides means whereby each electron beam has accessonly to one of' three separate areas of a particular type ofphosphor, these areas being physically interlaced to permit the production of a line raster by an electron beam which produces an area of illumination when it strikes the target. The line raster is therefore made up of a plurality of adjacent elemental areas of illumination in effect-controllable as to color and intensity. Sinceeach of the beams is capable of exciting only one ofthe primary colors, appropriate modulation of the beams with color intelligence will reproduce a picture in full color on the face of the kinescope 1. It should be understood that theA details of the kinescope 1 in themselves form no part of my invention, and are given by way of explanation only.

Switch arms 15, 16 and 17 are provided for changing the signals which are applied to the control grids 5, 6 and 7 of the kinescope 1. A three position switch 19 is also provided to change the frequency of the horizontal deflection voltage.

Since the switch arms 15, 16 and 17 are gang-connected,l all switches will be in the upper, middle or lower position at the same time. These switches are also ganged to the switch arm 19 which is associated with the hori-Y zontal deflection circuit. Thus, as the input to the con trol grids 5, 6 and 7 of the kinescope 1 isvchanged from video to audio or to a rectified audio, byrmoving the switch arms 15, 16 and 17 respectively to the upper, middle and 'lower positions the horizontal deflection switch arm 19 will' simultaneously be moved to change the frequency of the horizontal deflection voltage. The source of horizontal frequency, it should be understood, may be a single source which can be varied within the desired' limits. A v

' The video signal appliedy at 14 is passed to the control grids 5,V 6 and 7 when switch arms. 15, 16v and 17 are in the upper position. In this position of the switch contacts the tri-colored kinescope tube is operating normally, i. e., in the presence of a video signal the electron beams will be modulated in accordance with colored picture information, and a designin full color will be reproduced on the plate 8 of the kinescope. i Also, in this switch posi'- tion the horizontal deflecting frequency supplied from source 18 will be the television horizontaldeffection frequency standard of 15.75 kilocyclesper second. The vertical deflecting frequency is maintained approximately at the television vertical deflection standard of- 60 cycles per second.

When the switch arms 15, 16 and 17 are in the middle position as shown in Fig. l, the switch arm 19 will also-- be in the middle position. In this setting the control grids 5, 6 and 7 of the kinescope 1 are connected to receive the audio input signal.V At the movement'of the circuit of any commercially available television set. It should be understood, however, that an audio signal from any source, such as a phonograph reproducer, may be used. For normal operation the audio signal will be present at the same time the changing colored pattern appears on the face of the tube. By tapping off the audio signal at some point in the system in advance of the place where the volume control unit of the audio stage of the set is located, the heard audio signal may be switched on and off in accordance with the wishes of the observerV so that the changing colored pattern may be present without the sound.

The audio or music spectrum will be filtered into appropriate frequency bands by

filters

24, 25 and 26, and the output from the low-pass filter will be approximately in the range of frequencies from 30 to 500 cycles per second, the bandpass filter 25 will reject all frequencies except those in the 500 to 2500 cycles per secondhand, and those frequencies in the 2500 to 15,000 persecond band will be passed by the high pass filter 26'. When the switch arm 19 is moved to its lower'positi'orr, the

arm 15, 16 and 17 will be simultaneously moved to theirI bands by means of

filters

24, 25 and 26 which may be any of the well known types. By way of example filter 24, may pass frequencies in the 30 to 500 cycle range and reject all others. In the same manner filter 25 may pass frequencies in a band extending fromI 500 to 2500 cycles per second, and filter 26 may reject all' frequenciesexcept thosefalling within the 2500 to 15,000y cycles per second. These values are typical when the three primary colors are used in the kinescope. It is obvious, of cou-rse, that the filters may be changed according to either the selected colors or the wishes of the individual, and the values given by way of example, therefore, are not the onlyy possibilities.

The output currents from the low-pass filter 24, the

bandpass filter 25 and the high-pass filter 26 are im-Y pressed respectively on the inlputs of the

diode rectifiers

20, 21 and 22 which may be of any conventional type. The direct currentsin the outputs of the rectifiers will be representative of' the audio input to each both in its amplitude and in the rate at which it fluctuates inamplitude. In this manner the envelopes of the filteredv outputs are obtained. The rectified currents are then used to drive the control grids 5, 6 and 7' of the kinescope. Sincethe envelopefof the filtered and rectified input energy VchangesY relatively slowly with respect to time the picture onl the face of the kinescope will be, somewhat similar in appearance and effect to that obtained by thel other systems using a bank of colored lights. The face of the tube at any given moment, under these conditions, will substantially be one color which will cover almost the entire plate 8` of the kinescope, and the multi-coloredl geometric .pattern effect on. the face of the kinescope will be absent. However, since the scanning-process takes a finite amount oftime,y the picture will not be entirely one color. The circuit operation forthe lower switch positionis approximately the same, therefore, as the. systems heretofore-inuse. In contrast tothe previous systems, however, a

fast changing colored light is available onthe kinescope face which has practically no .time lag. The fast changing characterV of the pattern is kaleidoscopic in nature and is due to the random relation ofthe soundl signals to the relatively fixed horizontal and' vertical defiection fre- The fit

Referring to Figure 2, the picture on the plate 8 of the kinescope is illustrated for a low frequency condition, i. e., in the approximate range between and 500 cycles per second. Under these conditions low frequencies will produce horizontal bands of red when the three primary colors, red, blue and green, are used. The number of bands will increase as the frequency of the signal is increased within the low frequency range. Thus for a particular choice of low frequency audio input to the grid 5 of the tube, a picture containing a series of red horizontal bands will appear on the face of the kinescope as indicated in Figure 2.

Medium frequencies, on the other hand, will produce either many horizontal bands of green or a few vertical bands of green depending upon the exact frequency of the signal. In Fig. 3 the particular frequency of the signal applied to grid 6 is somewhere between the two extremes, i. e., horizontal hands and vertical bands. The result is a series of diagonal bands of green. The particular pattern will, of course, be dependent on the exact frequency,

and will vary in accordance with the frequency of the' incoming signal.

Fig. 4 indicates the picture on the face of the kinescope for a single particular high frequency condition. It has been observed that high frequency input in the 2.5 to l5 kilocycles per second band produces vertical bands of blue on the phosphor screen. In a manner similar to low frequency conditions, the bands will increase in number as the frequency increases. Thus for a given choice of high frequency audio input to the grid 7 of the kinescope, a picture containing a series of blue vertical bands will appear on the face of the kinescopes as indicated in Fig. 4.

With a complex signal such as music in the audio input to the grids of the kinescope, the bands will not be seen as such, but a complex, changing, geometrical pattern will be produced on the plate S of the tube as illustrated in Fig. 5 of the drawing. The resulting picture somewhat resembles that of a kaleidoscope, except of course, that the geometry of the pattern is determined by the music. Fig. 5 then represents a typical tube picture fora general audio input with the geometric pattern and color content of the pattern shifting instantaneously in response to the audio content of the complex signal.

Referring now to 6, a schematic representation of another embodiment of my invention is shown. In the example illustrated three

kinescopes

28, 29 and 30 are employed and the images on

faceplates

3l, 32 and 33 respectively, are reflected by means of a suitable optical system and superimposed on an image screen 35. For

purposes of illustration, the kinescope 28 is shown as the red kinescope, the kinescope Z9 as the blue kinescope, and the kinescope 39 as the green kinescope. Viewed as a complete unit, the optical system for projecting the images on the faceplates of

kinescopes

28, 29 and 30 to the image screen consists of a pair of crossed dichroic selective reflectors 37 and 38, and a 45 degree plane mirror 34. The relative positions of the optical components in the entire assembly are illustrated in Fig. 6. Other optical systems such as the one illustrated in a patent to D. W. Epstein, No. 2,590,240 may alternatively be used.

Light appearing on the faceplates 31 and 32 of the red and blue kinescopes 28 and Z9 is reected by means of the dichroic reflectors 38 and 3'7 respectively on screen 35 by means of plane mirror 34. Light from faceplate 33 of kinescope 3'@ passes through reflectors 37 and 38 and is reflected by mirror 34 on screen 35 so that a single, registered, multi-colored configuration is produced.

The remaining portions of the circuitry as illustrated in Figure 6 are similar to that used and illustrated in Figure l and heretofore explained. The switching arrangement for connecting control grids 39, 40 and 41 of the kinescopes 23, 29 and 30 to a video signal, an audio input, or a rectiiied audio input, is similar to that shown in the embodiment of the invention illustrated in Figure l. rhus, the horizontal deflection switch arm 19 is gang content and is intimately related thereto.

connected to input switch arms 1S', 16' and 17'. By moving these switches to any one of the three positions illustrated, similar results are obtained as for the case when a single kinescope is employed. In this manner the images appearing on the

faces

31, 32 and 33 of

kinescopes

28, 29 and 30 for the intermediate switch position will appear approximately as shown in Figs. 2, 3 and 4 respectively. Thus the image superimposed by means of reflectors 37 and 38, and plane mirror 34, on the image screen 35, will be similar to the pattern illustrated in Fig. 5 of the drawings.

As illustrated also in Fig. 6 of the drawings three

lters

24', 25 and 26 having low pass, bandpass and high pass characteristics, respectively, are serially connected to the control grids 39, 41 and 40 of the kinescopes. It should be understood that these lters have characteristics similar to their counter-parts as shown in Fig. 1 and described above. Similarly the diode rectitiers 20', 21 and 22' are similar to the three input rectitiers as shown in Fig. l, and are incorporated in the circuitry for identical reasons. Thus it is apparent that with the exception of the use of three kinescopes and an optical system for superimposing the images appearing on the kinescope faces, the embodiment of my invention as illustrated in Fig. 6 is identi-cal to the embodiment illustrated in Fig. l and the numbers of corresponding elements are primed.

ln this manner, the viewer may switch from the video input to the audio input if he becomes tired or bored with the picture. The particular utility of my invention will perhaps be realized to its best advantage for musical programs where the picture is of little interest, or in those situations where the viewer prefers not to concentrate on the picture and is interested in obtaining a soothing and attractive colored picture which changes with the musical By means of my invention this result is achieved in a simple manner and the two effects, music and color, are combined into an effective unitary interpretation.

Although the invention has been described in terms of an audio input to the filters, it is evident that any signals, video or even random, may alternatively be applied.

It should be understood that my invention, as disclosed, is not confined to any particular television system, being equally adaptable to any one desired.

It is to be noted that other systems for combining optically the separate images appearing on the faceplate of each kinescope may alternatively be used without departing from the essence of this invention.

What I claim and desire to secure by Letters Patent is:

l. A system for displaying colored configurations representative of sound which has been converted into corresponding electrical variations comprising in combination, a low pass filter, a high pass filter and a bandpass filter, said iilters adapted to receive and separate said variations into a plurality of different frequency bands, means coupled to said filters for detecting the envelopes of said frequency bands, a tri-color kinescope having a plurality of input circuits, switching means having a plurality of contact settings coupled to said plurality of input circuits, said switching means being adapted to apply each of said filtered frequency bands to each of said input circuits respectively in one contact setting, said switching means adapted to apply the detected envelopes of each of said filtered frequency bands to each of said input circuits respectively in another of said contact settings, and means coupled to said kinescope for controlling the horizontal deflection frequency thereof, said last-named means being coupled to said switching means so as to provide a different horizontal deflection rate when said switching means applies said detected envelopes to said input circuits than when said switching means applies said filtered frequency bands to said input circuits.

2. The invention according to claim Yl wherein said means for controlling the horizontal deiiection frequency provides a slower rate when said switching means applies said detected envelopes to said input circuits. than-when said switching means applies said filtered frequency bands to said input-circuits. v Y, c

3. The invention according to claim 2 wherein the slower horizontal deflection frequency is approximately 1000 cycles per second when said switching means applies said detected'envelopes to said input circuits.

4. They invention according to claimV 2 wherein said slower horizontal deiiection frequency is approximately 1000 cycles per second and wherein the'horizontal deiiection 4rate when said filtered frequency bands are appliedtov said input circuits is 15.75 kc.V y

v5. A system for displaying colored configurations representative of sound which has'been converted into corresponding. electrical variations comprising in combinatiorna low pass filter, a high pass filter and a bandpass filter, said filters adapted to receive and separate said variations into a plurality of different frequency bands, apluralityof means each of which is coupled to one of said filters for detecting the envelopes of each of said frequency bands respectively, first, second and third kinescopes each having meansfor controlling the intensity of the electron beam therein, switching means having a'plurality of contact settings coupled to each of said controlling means, said switching means being adapted in one of said contact positions to apply each. of said filtered frequency bands to one. of said-controlling meansy respectively, said switching means further adapted in another of said contact settings to apply the detected envelopes of each of said ltered frequency bands to each of said controlling means respectivelymeans coupled to each of said kinescopes for controlling the frequency of the horizontal deflection thereof, said last-named means also being coupled to said switchingmeans so as to provide a different horizontal deflection rate when said switching means applies said detected envelopes to said controlling mean-s than when said switching means applies said ltered frequency bands to said controlling means.

6. The invention as described in claim 5 wherein the horizontal deflection rate is slower when said switching means applies said detected envelopes to said controlling means than when said switching means applies said filtered frequency bands to said control means.

: 7. The invention .as described in claim 5 characterized by another contact setting for said switching means, said switching means adapted to apply video signals to said controlling means in said last-mentioned'contact setting, said means for controlling the horizontal deflection frequency being adapted` to provide a horizontal deflection rate of 15.75 mc. when said video signals are applied to said controlling means.

8. An entertainment device for the aesthetic interpretation of sound in continuously varying kaleidoscopic patterns of light changing in color, shape and design'as a function of changes in the amplitude of sound. energy fallingl in predetermined ranges of the sound frequency spectrum, comprising in combination: a source of electrical sound signal; means for dividing said sound signal into at least first, second and third frequency ranges to produce respective first, second and third control signals; means for producing an optical light raster comprised of apredetermined number of spaced lines, said line `raster bfeing formed by the simultaneous scansion of an element of illumination in both horizontal and vertical directions over the area of said raster atpredetermined fixed scansion frequencies randomly related to the frequencies falling in said first, second `and third sound signal'f'requency ranges; signal responsive means operatively associated with said raster producing means and having at least first, second and third control signal input terminals for changing the color and`intensity of light. emitted by said element of illumination at any given elemental position in said raster; and means coupling said first, .second and thirdcontrol signa-ls to said first,

second, and Vthird color control signalinput terminals for l and'vertical directions `over the area of said raster at predetermined fixed scansion frequencies, the intensity and color of light emitted by said element of illumination being controlled at each elemental position in said line raster, an.y entertainment system for interpreting-sound information in continuously changing kaleidoscopic patterns of color and brightness variations comprising in combination: signal responsive means adapted to receive color control signals for vcontrolling the intensity and color of' light emitted' by saidV element of illumination' at eachelemental positionin said'line raster; a source of electrical sound signals embracing a predetermined Vfrequency range, all frequency components in said sound signals being randomly relatedto both said vertical and horizontal scansion' frequencies; Vfilter means coupled with said signal source for 'dividing said sound signals into a plurality of frequency ranges the signals in each range being designated ascolorcontrol signals; and means coupling said filter means to said lcolor control means to apply said color control signalsY to said color control means for altering the intensity and color of said element of illumination as it defines said line raster.

10. In a colorY television receiver a system for the aesthetick interpretation of sound signals comprising in combination: a source ofy color television video signals; a source ofsound signals; means for producing-an optical light raster. comprised of a predetermined number of spaced lines, said line raster being formed by the simultaneous scansion of an elementof illumination in both horizontal and vertical directions over the area of said raster at predetermined fixed scansion frequencies randomly related in frequency to the signal frequencies comprising said sound signals; means coupled with said sound signal source for dividing said sound signal into low, medium and high frequency ranges to produce respective first, second and third color control signals; signal responsive means. operatively associated with said raster producing means and having a first, second and third control signal input terminals for changing a respective and different aspectof the color and intensity of light emitted by said element of illumination at any given elemental position in said raster; and switching means connected with said source of color video signals, said dividing means and said signal responsive means for selectively applying either said video signals or said first, second and third control signals to said signal responsive means for controlling the color and intensity of each element of said line raster as it is formed by the deflection of said element of illumination.

1l. In a color television system for producing optical images in color on a color kinescope reproducing means capable ofproducinga cathodoluminescent light image comprised of light from areas of at least a first, second and third type of cathodoluminescent material, each material type emitting a different color of light when excited by an electron beam, said kinescope reproducing means including an` electron beam producing means and means continuously deflecting said beam in horizontal and vertical directions at fixed deflection frequencies to form a rectangular raster of lines, an entertainment apparatus for the aestheticv interpretation of sound signals comprising in combination: signals responsive input means for independently controlling the intensity of light emitted by each type of cathodoluminsecent'material during deflection; a sourceof electrical variation representing sound signals, `sai'delectrical variations embracing the sound f requencyspectrumuand randomly related to the horizontal and vertical cathode ray beam deection frequencies; color control signal producing means including filter means connected with said source of electrical variations dividing said variations into low, medium and high frequency ranges to produce a first, second and third color control signals respectively corresponding in intensity to the amplitude of electrical variations falling in said low, medium and high frequency ranges; and means coupled with said color control signal producing means and said signal responsive input means for controlling the intensity of light emitted by said first, second and third types of cathodoluminescent materials by said rst, second and third color control signals respectively.

References Cited in the le of this patent UNITED STATES PATENTS Goldsmith Nov. 23, Schott Sept. 6, Ross Mar. 28, Sheldon Apr. 22, Sziklai Oct. 28, Potter Feb. 24,