fig1 shows a molded transparent plastic sphere 1 mounted on a molded opaque plastic base 2 which possesses three integral feet 3 , only one of which is shown . at the bottom of the sphere is a silvered platform 4 having at its center asilvered holographic photograph 5 . the photograph shown in fig1 is an eight point compass star but any circularly symmetric hologram or picture will do as the picture serves in a decorative function . at the center of the compass star in fig1 is located a half - silvered mirror film 6 which functions as a port for the entrance of light into thebase of the toy and onto a photodiode positioned just under the half - silvered mirrored film . fig2 shows the same view of the crystal ball toy as fig1 but with a portion of the base cut away . it is seen that a circuit board 7 is locatedunder the platform 4 . mounted on the circuit board 7 is shown a main component of this circuit , a texas instruments tsp50c41 speech synthesizerchip 10 or its equivalent . also shown mounted on the circuit board 7 are two of the resistors 11 and 12 that are part of this circuit . below the circuit board 7 are shown two of the four 1 . 5 v batteries 8 that power this circuit . the batteries 8 are hooked together in series and to the circuit board by insulated wire 14 . the batteries 8 are physically held in place by standard 1 . 5 v battery holders 13 arranged quadrangularlyaround the circuit board 7 which is circular . the battery holders 13 , in turn are mounted on a floor 15 of the base . alsomounted to the base floor 15 is an electrical speaker 9 . the floor 15 is made of masonite and has holes drilled through it to allow sound emission from the speaker 9 . fig3 shows a schematic diagram for the optoelectronic circuit of this talking crystal ball toy . the circuit is powered by four 1 . 5 v aa batteries 8 . ground is indicated by the standard symbol 31 . the photodiode16 functions as a photosensor switch for the circuit . the photodiode 16 is normally in an illuminated state thereby causing a 2n3906 ( pnp type ) transistor 17 to be saturated , thereby causing a 47k ohmresistor 18 to have a high voltage . this keeps the dp30 terminal of a texasintruments tsp50c41 speech synthesizer chip 10 in a high voltage state . thenormally illuminated condition also causes the init terminal of the chip tohave a high voltage and the dp10 terminal of the chip to have a low voltagebecause of a in4148 diode 20 . upon interruption of light to photodiode 16 , the transistor 17 is turned off , causing the resistor 18 to go to ground . this in turn pulls the init terminal voltage low . the first time the init circuit goes low causes the dp10 terminal to go high . at this time the internal microprocessor of the chip 10 is running , but no speech has resulted . no speech will result until the incident light is again interrupted . the second light interruption must take place within approximately three seconds or the internal microprocessor will again shutdown and require a double pass initiation . if the incident light is interrupted within the three second period , then terminal dp30 is caused to go low the second time , which initiates the internal speech synthesis program and hardware to emit at random one of twenty four pre - recorded verbal responses that have been digitally stored in the chip 10 . at the termination of the verbal response via a speaker 9 , the dp10 terminal automatically returns to a low state , and the process has to be repeated in order to initiate a second verbal response . the tsp50c41 chip is programmed to randomly select just one verbal phrase each time the speech synthesizer facility is initiated . normally the arrayof responses are all pre - programmed on the tsp50c41 chip 10 . however , this circuit allows an option to put additional messages on an optional external program 27 utilizing a texas instruments 60c20 rom chip 28 , or its equivalent . the rom chip 28 can be programmed in a foreign language , for example japanese . when it is desired to use the optional responses from the rom chip 28 in lieu of the on - board responses from the main chip 10 , then the dp31 terminal on the main chip must be changed from a grounded connection 25 to a plus connection 26 , as shown in the optional switch circuit 24 . the speed at which the voice response of the chip 10 is synthesized is controlled by the frequency of an external oscillator at terminals 32 and 33 comprised of a 3 . 07 mhz crystal 21 and two 33 pf capacitors 22 and 23 . the external oscillator frequency affects the tonal quality of the voice response . the tsp50c41 chip 10 shown in fig3 has enough audio output power through terminals 34 and 35 to drive directly a 50 ohm speaker 9 . if more power isdesired , an optional amplifier 29 can be installed , and the 50 ohm speaker changed to an 8 ohm speaker . for the 50 ohm speaker , a 1 uf capacitor 30 is connected across the speaker leads . the power source for this circuit , four 1 . 5 v batteries in series , gives a nominal voltage range of between 4 to 6 volts dc for a nominal voltage of 5 volts as depicted in fig3 . in the present embodiment of this invention , the voice responses which are digitally recorded in the tsp50c41 chip are as follows : the circuit in fig3 is shown to also contain a 0 . 22 uf capacitor 19 and an in4148 diode 20 . resistor 11 has a value of 100 k ohms and resistor 12 has a value of 10 k ohms . the terminal pins of the texas instruments tsp50c41 chip 10 possess the following functions . the init pin initializes input . when this pin is low , the chip is initialized and goes into a low power mode . vss is a ground pin . the irt pin is a ready for data output . the dp10 , dp30 , dp31 , and dp20 through dp27 pins are data bus points . the irt goes high as data in the data register of the chp 10 is read on the data bus dp pins . vco is the positive voltage pin . the various functions of the texas instruments 60c20 rom chip be found in data manuals for such component . the photosensor in the circuit disclosed in fig3 is comprised of an arrayof four amorphous silicon photovoltaic cells of about 2 . 4 v total output inseries in which the array of photovoltaic cells is acting as a photodiode . in an unilluminated condition , a silicon cell does not conduct electric current , whereas in an illuminated condition , a photovoltaic cell does conduct current but only in one direction . thus , when an independent voltage is applied across a photovoltaic cell , the photovoltaic cell becomes a photodiode . in fig3 the photovoltaic cell acts as a photodiode light switch . the transistor in fig3 functions as a voltage - change switch . together the photovoltaic cell - photodiode and the transistor function as a light activated voltage switch . the texas instruments tsp50c41 chip 10 is a 64k bit speech synthesis computer integrated on a single chip . the texas instruments tsp60c20 rom is a 256k bit read - only - memory capable of approximately 100 total voice responses and can digitally store foreign language or alternate / additionalenglish voice responses .
a talking crystal ball toy which is activated by a double pass of the operator &# 39 ; s hands over a photosensor to give a randomly selected verbal response to a question asked by the operator .