speaking microcontroller for deaf dumb
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Hi am anju i would like to get details on speaking microcontroller for deaf dumb
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#2

SPEAKING MICROCONTROLLER FOR DEAF AND DUMB
INTRODUCTION

In today’s world, there is a continuous need for automatic appliances with the increase in standard of living; there is a sense of urgency for developing circuits that would ease the complexity of life. This project is designed and developed to help the deaf and dumb people in their needs. Speaking microcontroller make the aware about the needs of disabled. The person should the corresponding control buttons. When the control buttons are pressed the voice IC will give out the sound signal corresponding to the control buttons. Speaking micro controller has leads to indicate which patient is in need
PROPOSED SYSTEM FEATURES

· Voice recorder IC to store the commands and to produce the sound signal.
· Reset buttons for the nurse to reset once the voice is heard.
· Bicolour LEDs to indicate that a patient is in need.
· Easy to set up.

· Economical and reliable.
CIRCUIT OPERATION
The first part of the circuit is the microcontroller.8 switches are connected to port1 in which switches connected to pins one to four represents patient2 and pins five to eight represent patient 1.
Crystal oscillator circuit is connected to pins 18 and 19.Eight LEDs corresponding to the eight control buttons is connected to port 3. Port 2 represents the output of the microcontroller. Two control buttons and two LEDs is connected to pins 16, 17, 10 and 13 respectively. When a patient press the control button corresponding led connected port3 blinks, which informs the nurse that the patient is in need. The microcontroller interfaced with APR voice IC produces the corresponding commands stored in it. The switches connected to 89C52 is used for resetting all the LEDs and this done by the nurse.
The voice recorder IC playbacks the stored commands when the patient presses the control button. APR9600 is used in the random access mode in which 8 commands can be stored .The APR IC is designed in such a way that it playbacks message up to 60seconds.
The circuit diagram contains two parts. the first part is the microcontroller part and the other is the voice IC part.
MICROCONTROLLER
The microcontroller is the main part of the circuit and controls all the actions of the circuit. The control buttons, voice IC and the LEDs are connected to the microcontroller. The eight control buttons are connected to the port one of the microcontroller. Each patient contains four switches hence total eight switches for the two patients. LEDs are connected to the port zero which blinks when the corresponding command is pressed by the patient. The reset buttons for the nurse is provided at the port three of the microcontroller. The eight pins of port two of the microcontroller is connected to the voice IC through parallel connection. Since there is no external access the external access control pin is connected to VCC.
The circuit operation can be clearly explained through the following example. Consider that patient one has pressed the control button for water. The corresponding LED for patient one will glow at the nurse’s room and the APR will playback the voice command ‘water’ until the nurse has pressed the reset button. Once the reset button is pressed, all the control buttons are resetted.
APR VOICE IC SECTION
The APR voice IC is a 28 pin IC which has high levels of storage capability with its advanced non-volatile flash memory where each memory cell can store 256 voltage levels. The voice IC contain inbuilt AGC, anti-aliasing filter, amplifier, internal oscillator etc. The APR9600 samples incoming voice signals and stores the instantaneous voltage samples in non-volatile FLASH memory cells. Each memory cell can support voltage ranges from 0 to 256 levels. These 256 discrete voltage levels are the equivalent of 8-bit (28=256) binary encoded values. During playback the stored signals are retrieved from memory, smoothed to form a continuous signal, and then amplified before being fed to an external speaker. The APR9600 automatically filters its input, based on the selected sampling frequency, to eliminate the aliasing errors. Higher sampling rates increase the bandwidth and hence the voice quality, but they also use more memory cells for the same length of recording time. Lower sampling rates use fewer memory cells and effectively increase the duration capabilities of the device, but they also reduce incoming signal bandwidth. The APR9600 accommodates sampling rates as high as 8 kHz and as low a 4 kHz. We can control the quality/duration trade off by controlling the sampling frequency. An internal oscillator provides the APR9600 sampling clock. Oscillator frequency can be changed by changing the resistance from the OscR pin to GND.
Playback and record operations are managed by on-chip circuitry. There are mainly three modes of operations ie. random access mode, auto rewind mode and tape mode. Here we use random access mode for random access of message commands. The first seven pins and the 9th pin of the IC is the message trigger pins where we store the commands.
On power up, the device is ready to record or playback in any of the enabled message segments. To record, /CE must be set low to enable the device and /RE must be set low to enable recording. The recording can be initiated by applying a low level on the corresponding message trigger pin. On power up, the device is ready to record or playback in any of the enabled message segments. To playback, /CE must be set low to enable the device and /RE must be set high to disable recording and enable playback. The playback can be initiated by applying a high to low edge on the corresponding message trigger pin.
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