| SP0256 Speech Processor: |
| The General Instruments SP0256 Speech Processor is an IC that can make any of the speach sounds in the English language. Though there are many other speech processor chips out there, it was the one i had on hand so i decided to use it . The SP0256 does not have a memory for external use so i added one as can be seen in the schematic below. It is recommended by General Instruments to run this chip from a computer with a simple Basic program via a parallel port such as a one for a printer. But this circuit does not require the use of a computer the BCD code is manually installed into a 6116 2K x 8 SRAM via a simple 16 pin DIP Switch (8 switches). Without this memory IC the SP0256 would have to be permanently connected to a computer if it is going to do any thing, so the addition of a memory IC is of great value. |
| Circuit Operation: |
| Though this circuit uses DIP switches to manually input the BCD code, it is quite easy to do . The chosen code must of course be written down on paper and then the DIP switches (8 of them) used to input this code into memory one byte at a time. Every time a byte is set up on the DIP switches the R/W push-button (Read/Write) must be depressed to enter it into the 6116 SRAM via its Data pins ( 9,10,11,13,14,15). It must also be noticed that a different address has to be opened for each data entry, this is accmplished by the BCD counters. This is not shown in the schematic below for size , check back to schematic scrapbook under SRAM Programmer and contact bounce suppressor circuits. |
| Schematic SP0256 Speech Processor: |
| Parts List: |
| R1 10 Ohm 1/4 Watt Resistor R2 100 K 1/4 Watt Resistor R3,R4 33 k 1/4 Watt Resistors R5 10 K Potentiometer R6 1 k 1/4 Watt Resistor C1 250 UF Electrolytic Capacitor C2 ,C3,C4 0.1 UF Capacitors C5 100 UF Capacitor C6 10 UF Capacitor C7 1 UF Capacitor C8 0.022 UF Capacitor C9 5 to 30 pF Trimmer Capacitor C10 10 pF ceramic Capacitor XTAL 3.12 Mhz Crystal ( Or use 3.579 Mhz colorburst crystal) 1 LM386 Op-Amp IC 1 SP0256-AL2 IC 1 16 Pin DIP switch ( 8 Switches) 2 7493 BCD Counter ICs 1 7400 Quad Nand Gate 1 DB25 Connector ( Optional) |
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