Radio Shack VoxBox TRS-80 Service Manual Download Page 19 | Manualshive

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Summary of Contents for VoxBox TRS-80

Page 1: ...I 1 m m i i i I i TRS 80 TM RECOGNITION Catalog Number 26 1181 tZcMIlO fitick tws so VOXBQX p II Mll Mll lM li i wi 4 ilifllfifo i wss CUSTOM MANUFACTURED FOR RADIO SHACK A DIVISION OF TANDY CORPORATION ...

Page 2: ......

Page 3: ...by the speech recognition hardware The hardware itself simply extracts four bits of information from the speech waveform and presents it to the computer The recognition program samples this data approximately every 10 ms In addition two BASIC test programs are available to help debug the board The first program tests the board by training and recognizing the ten digits zero through nine The second...

Page 4: ...cond BASIC test program Test 2 PROGRAM 2 Run the second program and say the word six loudly and clearly You should see roughly the same shaped plots as shown in Figure 1 If any of these lines are constant across the screen with no variation at all then the corresponding area of the circuitry is at fault The top line is a plot of low band energy which corresponds to the rectifier averager output fr...

Page 5: ...VOXBOX BOARD IN BOX TOP COVER REMOVED FIGURE 1 3 ...

Page 6: ...L AMPLITUDES FREQUENCIES TYPICAL PLOT OF WORD 6 AS SEEN ON TRS 80 VIDEO DISPLAY FIGURE 2 4 ...

Page 7: ...FOR TR 0 TO 10 350 PRINT SAY W TR 360 GOSUB 1000 REM TRAIN 370 NEXT TR 400 REM GET VOICE INPUT 410 POKE 16 5 26 3 420 POKE 16527 AD 430 PRINT SPEAK 440 X USR 0 REM CALL RECOGNITION 450 W PEEK TX 460 IF W 31 THEN GOTO 500 470 PRINT YOU SAID W W 480 GOSUB 900 REM DELAY 490 GOTO 400 500 REM ERROR 510 PRINT PLEASE REPEAT THAT 520 GOSUB 900 REM DELAY 530 GOTO 400 900 REM DELAY FOR BETTER USER INTERACTI...

Page 8: ...28673 12 THEN 80 40 PRINT ERROR VOX BOX SOFTWARE NOI1 LOADED 50 3ND 60 R1 240 B1 3078 L1 2411 B2 3041 GOTO 90 70 1 176 Bl 19 46 2 L1 18795 132 19425 GOTO 80 R1 112 B1 29690 L1 303 57 B2 29727 GOTO 90 90 ls 100 PRINT 3 50 SPEAK 110 POKE B1 0 120 POKE 16526 0 130 POKE 16527 Rl 140 X USR 0 150 CLS 160 L PEEK L1 165 PRINTS 114 LEN L 170 B B2 180 FOR 1 10 TO L 10 190 IF PEEK B 0 THEN X l ELSE X 0 200 S...

Page 9: ...rom a zener diode dropping network on the 12V supply In particular the 12V supply should be free from noise in the 0 10 KHz band Microphone Preamp Insert the microphone into its mating connector Close the push to talk switch speak into the microphone and observe the preamp output IC6 Pin 7 The output should swing above and below the resting level of 6V If no signal is present test for output at th...

Page 10: ...lightly Less Than 6 Volt Reference at IC5 5 Square Waves to 5V Sine Waves Swinging Above Below 6V DC Voltage Slightly Less Than 6 Volt Reference at IC6 12 None Random Square Waves 6 VDC Same as above Random Square Waves 6 VDC Same as above Rectifier Averagers The comparator outputs should sit at volts with no signal and go to 5 volts with signal into the system The amplifier outputs should sit at ...

Page 11: ...ld be seen at 1C2 pins 1 and 13 and at IC3 pins 1 4 8 and 13 I sing the VI memor till function ot I BUG choose a memory area and enter the following program Address DB AF C3 Address For example if the program is chosen to reside at 7000 H the steps would be M7000 DB AF C3 00 70 To execute the program at 7000H type J7000 jg 3 J Assembly Procedure Place the board component side up into the bottom ha...

Page 12: ...The second stage of the microphone preamp provides additional gain The microphone preamp amplifies the 10 40 millivolt microphone signal and produces a signal of 1 to 10 volts peak to peak output Since all the analog cir cuitry operates from a single 1 2 V supply the output of the microphone preamp is biased for a no signal output of about 6V and swings above and below this rest level This amplifi...

Page 13: ...KE PREAMP ADDRESS BUS AMPLITUDE DETECTION ZERO CROSSING DETECTOR BUS DRIVERS LOW BAND AVERAGER AMPLITUDE DETECTION FILTER ZERO CROSSING DETECTOR 1 ADDRESS DECODING BUS DRIVERS DATA IN BUS VOXBOX BLOCK DIAGRAM FIGURE 3 11 ...

Page 14: ... The higher the amplitude of the input the closer the output is to ground The output of the rectifier averager stage is applied to the negative input of a voltage comparator whose positive input is a fixed voltage just slightly less than the 6 volt reference The normal comparator output is thus zero volts When a small amount of speech energy is amplified filtered and rectified the out put of the r...

Page 15: ... sec of continuous speech End of word identified by first interval of silence at least 0 1 sec which follows detection of beginning of word TRS 80 with Level II Basic and at least 16K RAM May be used with other peripherals and more capable versions of TRS 80 system 4096 bytes RAM reserved at the high end of user memory I O PORT AF HEX 175 DEC 120 VAC 50 60 Hz 0 1 Amp via separate 15 VDC power pack...

Page 16: ...wo ZLU Old UJ3S CCOWl Z Q3XO OUJflOlUO 14 ...

Page 17: ... 80 20 RESISTORS R1 Carbon Comp 1 K 1 4W 5 R2 Carbon Comp 510K 1 4W 5 R3 Carbon Comp 100K 1 4W 5 R4 Carbon Comp 8 2K 1 4W 5 R5 Carbon Comp 5 1K 1 4W 5 R6 Carbon Comp 300K 1 4W 5 R7 Carbon Comp 360 K 1 4W 5 R8 Carbon Comp 360 K 1 4W 5 R9 Carbon Comp 75 K 1 4W 5 R10 Carbon Comp 240K 1 4W 5 R11 Carbon Comp 18K 1 4W 5 R12 Carbon Comp 300 K 1 4W 5 R13 Carbon Comp 300K 1 4W 5 R14 Carbon Comp 30 K 1 4W 5...

Page 18: ...gic 74126 IC4 Integrated Circuit LM339 IC5 Integrated Circuit LM324 IC6 Integrated Circuit LM324 IC7 Power Regulator Circuit 78M05 IC8 Integrated Circuit 78L12 CR1 Diode IN752 CR2 Diode IN4148 CR3 Diode IN4148 CR4 Diode IN4148 MISCELLANEOUS J1 Subminiature Phone Jack Imtronics HCY250 J2 DIN plug Microphone Input SMKSI 3354 J3 Cable Assy SI Power Switch Centralab 2KAB010000 132 T1 Power Unit 15V LA...

Page 19: ...3CR3 R14 e Qcio f R15 R16 _ i u CD O CD Hw R12 Wftsi R9 R8 f j R21 H R24 h R23 f I R20 ft Y HjllG R18 CR2i fe R17 N Vllf C12 C13 C11 17 ...

Page 20: ...TES WITH THREE STATE OUTPUTS 74126 positive logic Y A Output is off disabled when C is low VCC C 4A 4Y 3C 3A 3Y See page 6 33 1C 1A 1Y 2C 2A 2Y GND SN54126U W SN74126 J N SN54LS126 J W SN74LS126 J N LM339 schematic and connection diagrams _L 3 5 A 5 lOO A JJ S A INPUT O W i M TK sv 1 05 I I 06 i dt Dual ln Line and Flat Package OUTPUT 3 OUTPUT 4 GND INPUT 4 INPUT 4 INPUT 3 INPUT 3 13 112 D L r t 2...

Page 21: ...gram schematic diagram Each Amplifier Dual ln Line and Flat Package OUTPUT 4 iNPLM 1 INPUT 4 GND INPUT 3 INPUT V OUTPUT 3 14 13 12 11 OUTPUT 1 INPUT r INPUT 1 V f INPUT 2 INPUT Ou TOP VIEW 78L12 r 1 I I 03 K Pi AVV M 01 I 4 VW f ne LM78LXX 19 ...

Page 22: ...ematic and connection diagrams n 7 RI 1 1 01 1 J S 9 Hj 1 a D3 i 1 i VW 1 14k O V N f 1 Q 6 Plastic Package GND rRONT VIEW Order N umbers LM341P5 0 LM341P 12 LM341P6 0 LM341P 15 LM341P8 0 LM341P 18 LM341P 10 LM341P 24 See NS Package P03A 20 ...

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