The document discusses using an ADSP processor to generate 3D images. It describes how the generated image can be rotated in three axes using the processor's assembly instruction set flexibility. X, Y coordinates of the image are input and used to generate deflection signals that control DACs and produce the image on a CRT. The system loads a program from boot memory on reset to execute the image generation program.

1. 3D IMAGE GENERATION USING ADSP
The DSP processors are commonly used to handle the image
data, where the image has to be processed digitally and
accurately, such as the application like scanning systems in Bio-
medial Field.
The processor has powerful instruction sets and most of the
instructions are one cycle execution. So that the result can be
obtained much faster and efficient, which is required for Analog
signal processing.
In this project, we are generating a 3D image using ADSP (DSP)
processor. The generated Image can be rotated in 3-axis (X,Y &
Z) using flexibility of the assembly instruction set of the processor.
Initially we draw the Image in a graph sheet and take X,Y co-
ordinates of the image. This data will be input to our systems
This can be obtained from the sensor used for scanning in Real
time
The Software is developed such that it can take these data and
generates the X & Y deflection signal.
The hardware has a DSP with Boot memory. The developed
firmware will be loaded in EPROM and it will be configured as
Boot memory for DSP.
On reset the Processor loads the data (program) from the Boot
memory to its internal Program memory and starts executing the
Program.
Two DACs (Digital to Analog Converter) are used to control the X
& Y deflection of CRT. So the software controls these two DACs
and generates the Image in CRT.
We can also use a CRO as CRT in X-Y mode. The signal given to
the Channel1 of CRO may deflect the dot X-direction and
Channel2 for Y-direction.

2. ADSP
Adaptive Digital Signal Processing; exclusive to SGC, a DSP
technology which processes the signal to eliminate unwanted
noise and improve incoming signal
DSP
DSP stands for Digital Signal Processor. DSP chips are widely
used in sound cards, fax machines, modems, cellular phones,
high-capacity hard disks and digital TVs
DSP chips are used in sound cards for recording and playback
and speech synthesis. Other audio uses are amplifiers that
simulate concert halls and surround-sound effects for music and
home theater
Digital Signal Processing uses mathmatics to operate on a digital
signal (such as a digital audio stream) to generate some type of
altered output. DSP is used heavily in software and hardware
effects processing.
DSP chips are found on an increasing number of sound cards to
provide extra audio processing power and help relieve the
computers CPU of this type of work, much like a 3D graphics
accelerator would for rendering 3D graphics

3. 3D IMAGE GENERATION USING ADSP
BLOCK DIAGRAM
DAC 1 TO CRO
BOOT 8Bit CH1
MEMORY
PROCESSOR
ADSP
TO CRO
DAC 2 CH2
DATA
8Bit
MEMORY

4. ADAPTIVE FILTER IMPLEMENTATION
The aim of the project is to develop a digital system to perform adaptive
filtering of analog signals.
Adaptive filters are used to accomplish a variety of applications,
including
1. Echo cancellation in Voice or Data signals.
2. Noise cancellation in Speech, Audio and Biomedical signal
processing.
3. Channel equalizations in Data communication to minimize the effect
of intersymbol interference
BASICS OF ADAPTIVE DIGITAL FILTERS
Adaptive filter can be implemented from the FIR filters. Normally, in FIR
filters, the filter coefficients are constant. But in the adaptive FIR filters,
the filter coefficients are adjusted to minimize the errors.
Thus when we employ adaptive filter for echo cancellation, the FIR filter
coefficients are adjusted in every cycle to remove the echo from the
input. Adaptive filters can be implemented using the least Mean-square
(LMS) algorithm.
HARDWARE
The block diagram of ADSP system used for adaptive filtering is shown
in Fig.1. The system consists of ADSP as CPU, CODEC, EPROM,
RAM, Amplifier circuits, MIC and speaker. The CODEC has been used
for analog input and output.
The CODEC has been interfaced to ADSP through its serial port. The
optional hardware includes PC interfacing circuit consisting of serial
Input port and RS 232 level converter. The additional serial Input port
have been developed using buffer.
FUNCTIONING
The analog input signal from MIC are amplified and fed to CODEC. The
CODEC converts the analog signal into digital data and transfer the
data to DSP microprocessor.
The processor adds echo to the input and it will output the signal with
echo to the speaker.

5. The signal with echo can be stored in memory and then adaptive filter
can be introduced so as to remove the echo from the input signal.
After introducing the adaptive filter, we can hear that the echo is slowly
removed.
The adaptive filter coefficients are also output to CODEC which
converts the digital filter coefficients to analog and they can be viewed
on the CRO.
APPLICATIONS OF ADAPTIVE FILTER
Digital Audio
Digital Graphical Equalizer
Noise removal
High Speed Modems
Noise removal in ECG signals
ADSP
Adaptive Digital Signal Processing; exclusive to SGC, a DSP
technology which processes the signal to eliminate unwanted noise
and improve incoming signal
DSP
DSP stands for Digital Signal Processor. DSP chips are widely used in
sound cards, fax machines, modems, cellular phones, high-capacity
hard disks and digital TVs
DSP chips are used in sound cards for recording and playback and
speech synthesis. Other audio uses are amplifiers that simulate
concert halls and surround-sound effects for music and home theater
Digital Signal Processing uses mathmatics to operate on a digital
signal (such as a digital audio stream) to generate some type of
altered output. DSP is used heavily in software and hardware effects
processing.
DSP chips are found on an increasing number of sound cards to
provide extra audio processing power and help relieve the computers
CPU of this type of work, much like a 3D graphics accelerator would
for rendering 3D graphics

6. Fig 1. Block diagram of ADSP -2105 system used for adaptive filtering
Optional
Hardware
Power Amp
Speaker
PC
ADSP SERIALINPUT RS 232c
CODEC
PORT LEVEL
-2105
CONVERTER
Mike
Pre Amp
SYSTEM BUS
EPROM B FFE
U R DAC CRO
RAM AMP

7. DTMF GENERATION AND
DETECTION
The aim of the project is to develop a digital system for generation and
detection of DTMF tones. The DTMF (Dual Tone Multifrequency) are used
in Modern push button telephones.
The push button telephones are replacing the conventional dial-pulse
signaling in telephone networks worldwide.
PRINCIPLE
The DTMF tones are sinusoid signals of standard frequencies defined by
CCITT (Consultative Committee for International Telephones and
Telegraphy).
In push-button telephones, for each digit, two tones are assigned. One
tone is chosen out of 4 Row tones and the other is chosen out of 4 column
tones.
By this combination, 16 different DTMF digits can be formed as
shown in figure below.
The DTMF tones can be easily generated or detected using DSP
microprocessor based system.
DTMF tones can be generated using function generation programs and
DTMF tones can be detected by performing FFT analysis of the signals.

8. The FFT of a signal will give the frequency components of the signal and
from the knowledge of frequency component, the DTMF digit can be
identified.
HARDWARE
BLOCK DIAGRAM OF ADSP
DTMF GENERATION AND DETECTION
The system consists of ADSP-2105 as CPU, CODEC, EPROM, RAM,
Amplifier circuits, MIC and speaker. The CODEC has been used for
analog input and output, the CODEC has been interfaced to ADSP-2105
through its serial port.
The optional hardware includes PC interfacing circuit consisting of serial
Input port and RS 232 level converter. The additional serial Input port
have been developed using buffer.
FUNCTIONING
1. Generation
The generation program can be permanently stored on EPROM. The
program can be executed using the INTERRUPT key and on pressing
the interrupt key each time, the tones of different frequencies are
generated one by one.
For generation of each tone, the processor determines the digital
signal using function approximation technique and output to CODEC.
The CODEC converts the digital signal to analog signal, which is
amplified, and output to the speaker.

9. 2. Detection
For detection of DTMF tones, the DTMF detection program is
permanently stored in another EPROM. The tone to be detected is
input to the system through CODEC.
The CODEC digitizes the analog signal and send the digital signal to
ADSP-2105. The processor performs FFT operation on the signal to
determine the frequency spectrum of the signal.
The spectrum is output to CRO through DAC and viewed on the screen
of CRO. From the knowledge of frequency spectrum, the input DTMF
tone can be identified.
APPLICATIONS
DTMF is popular in interactive control applications like
1. Telephone banking
2. Electronic Mail system
3. Interactive Telephone Answering systems
4. Railway Reservation system.
ADSP
Adaptive Digital Signal Processing; exclusive to SGC, a DSP technology
which processes the signal to eliminate unwanted noise and improve
incoming signal
DSP
DSP stands for Digital Signal Processor. DSP chips are widely used in sound
cards, fax machines, modems, cellular phones, high-capacity hard disks and
digital TVs. DSP chips are used in sound cards for recording and playback and
speech synthesis. Other audio uses are amplifiers that simulate concert halls
and surround-sound effects for music and home theater
Digital Signal Processing uses mathmatics to operate on a digital signal
(such as a digital audio stream) to generate some type of altered output.
DSP is used heavily in software and hardware effects processing.
DSP chips are found on an increasing number of sound cards to provide
extra audio processing power and help relieve the computers CPU of this
type of work, much like a 3D graphics accelerator would for rendering 3D
graphics

10. FFT/ SPECTRUM ANALYSER/
HARMONIC ANALYSER / FREQUENCY
MEASUREMENT
The aim of the project is to develop a low cost spectrum analyser
using the DSP processor ADSP. The spectrum can be viewed on the
CRO.
Principle
Any analog signal is a mixture of a number of sinusoidal signals of various
frequencies. The various sinusoidal component frequencies of a signal is
called a spectrum.
A sinusoidal signal is a complex quantity and so it has magnitude and
phase. Hence frequency spectrum consists of magnitude plot and phase
plot. In order to detect the presence of a frequency component, it is
sufficient if we obtain the magnitude spectrum alone.
Hence it is decided to compute the magnitude spectrum using ADSP
processor. The processor performs a FFT operation using radix - 4 FFT
algorithm to determine the magnitude spectrum of the signal.
DSP
DSP stands for Digital Signal Processor. DSP chips are widely used in sound
cards, fax machines, modems, cellular phones, high-capacity hard disks and
digital TVs.
DSP chips are used in sound cards for recording and playback and speech
synthesis. Other audio uses are amplifiers that simulate concert halls and
surround-sound effects for music and home theater
Digital Signal Processing uses mathmatics to operate on a digital signal
(such as a digital audio stream) to generate some type of altered output.
DSP is used heavily in software and hardware effects processing.
DSP chips are found on an increasing number of sound cards to provide
extra audio processing power and help relieve the computers CPU of this
type of work, much like a 3D graphics accelerator would for rendering 3D
graphics

11. Hardware
The spectrum analyser system consists of ADSP as CPU, EPROM, RAM,
CODEC and AMPLIFIER. The optional hardware includes serial Input port
and RS 232 level converter for interfacing with PC. Another optional
hardware includes 8031 based waveform generator.
The PC interface can be used to download the object codes of the
program from the PC. The analog signal whose spectrum has to be
estimated is fed to CODEC through MIC or a function generator
(Oscillator).
The CODEC digitize the analog signal and send to ADSP which performs
FFT on the digital signal. The processor output the result of FFT to
CODEC which converts the digital signal to analog. The analog signal is
amplified and displayed on the CRO. The block diagram of the system is
shown in fig.1.
The system can access the analog signal in the frequency range of 0 to
3kHz. The spectrums can be viewed as a voltage spike on the CRO
screen.
For measuring the frequency, a calibration pulse is output by ADSP which
indicates the start of the frequency scale. The divisions on the CRO
screen can be calibrated using a known single frequency signal.

12. FIR FILTER DESIGN USING ADSP
AIM
The aim of this project is to design FIR filter and to implement the
algorithm using ADSP Processor. The system has four selectable
band pass filters, which is used to modify the voice/music.
HARDWARE
The FIR filter system consists of a DSP microprocessor ADSP
CODEC, EPROM, RAM, Amplifier, Mic and speaker.
The CODEC has been interfaced to ADSP processor through its
serial port.
In this system additional serial port has been developed using buffer
and latch to provide serial communication with PC serial port.
The TTL logic levels of serial port are converted to RS-232 level
using level converter, so that the system can directly communicate
with the standard serial port (com1/com2) of Personal Computer
(PC).
SOFTWARE
The system software and filter algorithm are developed in ADSP
assembly language using PC.
The assembly language programs are compiled using ASM21
assembler and converted to machine code which are either
permanently stored in EPROM or downloaded to the ADSP system
through PC serial interface.
FUNCTIONING
The analog input from the microphone is fed to CODEC. The ADSP
reads the digital signal from CODEC, performs filtering operation,
and then output the processed signal back to CODEC.
The CODEC converts the digital signal back to analog and this
analog signal is fed to the speaker. The desired band pass filter can
be selected by using the interrupt key.

13. APPLICATIONS
We can implement the following operations on the voice input
1. Filtering the voice on various bands
2. Changing the nature of voice using filtering
ADSP
Adaptive Digital Signal Processing; exclusive to SGC, a DSP
technology which processes the signal to eliminate unwanted noise
and improve incoming signal
DSP
DSP stands for Digital Signal Processor. DSP chips are widely used
in sound cards, fax machines, modems, cellular phones, high-
capacity hard disks and digital TVs
DSP chips are used in sound cards for recording and playback and
speech synthesis. Other audio uses are amplifiers that simulate
concert halls and surround-sound effects for music and home theater
Digital Signal Processing uses mathmatics to operate on a digital
signal (such as a digital audio stream) to generate some type of
altered output. DSP is used heavily in software and hardware effects
processing.
DSP chips are found on an increasing number of sound cards to
provide extra audio processing power and help relieve the computers
CPU of this type of work, much like a 3D graphics accelerator would
for rendering 3D graphics

14. FIR FILTER DESIGN USING ADSP

15. FUNCTION GENERATOR
The aim of the project is to develop a high precision, function generator
using DSP processor ADSP. The DSP processors are capable of
generating high precision waveforms.
In digital means of generation there is no drift in the generated
waveforms but the drift is inherent in analog systems due to
temperature coefficient of the components.
ADSP
Adaptive Digital Signal Processing; exclusive to SGC, a DSP
technology which processes the signal to eliminate unwanted noise and
improve incoming signal
DSP
DSP stands for Digital Signal Processor. DSP chips are widely used in
sound cards, fax machines, modems, cellular phones, high-capacity
hard disks and digital TVs
DSP chips are used in sound cards for recording and playback and
speech synthesis. Other audio uses are amplifiers that simulate concert
halls and surround-sound effects for music and home theater
Digital Signal Processing uses mathmatics to operate on a digital signal
(such as a digital audio stream) to generate some type of altered output.
DSP is used heavily in software and hardware effects processing.
DSP chips are found on an increasing number of sound cards to provide
extra audio processing power and help relieve the computers CPU of
this type of work, much like a 3D graphics accelerator would for
rendering 3D graphics
PRINCIPLE
Any signal to be generated can be represented by a mathematical
equation and it will be a function of the frequency of the desired signal.
For a given frequency, the function can be evaluated at finite number of
points and the signal can be represented as a set of data. These data
can be output to a DAC to generate the required analog signal.

16. The digital function generator using ADSP has the following
advantages.
1. Precise waveform output.
2. No drift in output due to temperature variations of the
component.
3. Any special type of waveform can be implemented.
HARDWARE
The digital function generator consists of ADSP as CPU, EPROM, RAM,
DAC and Amplifiers. The optional hardware includes PC interface using
serial Input port and level converter. The Input port is implemented
using the buffer
If PC interface is provided, the program for generation of waveform can
be downloaded from PC. When PC interface is not available, the
program can be permanently stored in EPROM.
The program can be executed using the INTERRUPT key. When
interrupt key is pressed the ADSP starts generating the digital waveform
which is output to DAC to convert the digital signal to analog signal.
The analog signal can then be viewed on the CRO.

17. GRAPHICS ENGINE DESIGN ADSP
ADSP
Adaptive Digital Signal Processing; exclusive to SGC, a DSP
technology which processes the signal to eliminate unwanted noise
and improve incoming signal
DSP
DSP stands for Digital Signal Processor. DSP chips are widely used
in sound cards, fax machines, modems, cellular phones, high-
capacity hard disks and digital TVs
DSP chips are used in sound cards for recording and playback and
speech synthesis. Other audio uses are amplifiers that simulate
concert halls and surround-sound effects for music and home
theater
Digital Signal Processing uses mathmatics to operate on a digital
signal (such as a digital audio stream) to generate some type of
altered output. DSP is used heavily in software and hardware effects
processing.
DSP chips are found on an increasing number of sound cards to
provide extra audio processing power and help relieve the
computers CPU of this type of work, much like a 3D graphics
accelerator would for rendering 3D graphics
The objective of this project is to develop a microcomputer system to
generate various complex geometric models, symbols, images etc.
using line drawings. The system is proposed to be developed using the
DSP microcomputer ADSP.
Any complex symbol or image can be constructed using dots and lines
or curves joining the dots. This forms the basic principle of graphics
generation.
For creation or generation of any object, the object has to be defined by
dots and lines joining the dots in a three-dimensional space consisting of
x, y and z axes. These line data, point data (reference data) are used by
the assembly language program developed using ADSP instruction set
to generate the required object.

18. HARDWARE
The graphics engine has been designed in this project using ADSP as
CPU. The system consists of ADSP, EPROM, RAM, PC interface,
Buffer, DAC and amplifiers.
The PC interface has been developed using Serial I/O port and RS232
level converter. The output of DACS can be sent to 2 channels of CRO
to view the generated image on the CRO Screen.
FUNCTIONING
The line data and source data is downloaded from the PC to the ADSP
processor.
On pressing the IRQ2 switch on the kit the object that is created using
line data and source data can be viewed in various mode of rotation. The
zoomed object can also be viewed.
Applications
The concept can be used for
1. Video games
2. Ray tracking
3. Three - dimensional animation
4. Shadow casting
5. Hidden line elimination

19. GRAPHICS ENGINE DESIGN ADSP

20. IMAGE PROCESSING SYSTEM ADSP
TWO DIMENSIONAL FILTERS
BASICS
Image processing is a visual task. An image consists of two-dimensional
array of numbers. Image processing often involves computation on large
matrices that represents digitized images.
Each element of the array represents a pixel of the image; its location in
the array corresponds to its location in the image and its value
determines the shading of the pixel.
Image processing involves processing or altering an existing image in an
desired manner.
The first step is obtaining an image with image data this is achieved
through a stand-alone application program with CIPS. (C image
processing system).
ADSP
Adaptive Digital Signal Processing; exclusive to SGC, a DSP
technology which processes the signal to eliminate unwanted noise
and improve incoming signal
DSP
DSP stands for Digital Signal Processor. DSP chips are widely used
in sound cards, fax machines, modems, cellular phones, high-
capacity hard disks and digital TVs
DSP chips are used in sound cards for recording and playback and
speech synthesis. Other audio uses are amplifiers that simulate
concert halls and surround-sound effects for music and home
theater
Digital Signal Processing uses mathmatics to operate on a digital
signal (such as a digital audio stream) to generate some type of
altered output. DSP is used heavily in software and hardware effects
processing.

21. DSP chips are found on an increasing number of sound cards to
provide extra audio processing power and help relieve the
computers CPU of this type of work, much like a 3D graphics
accelerator would for rendering 3D graphics
HARDWARE
This project is proposed to develop an efficient hardware to implement
the “Image Processing” algorithm.
The hardware required for image processing system have been
implemented using powerful DSP processor ADSP.
The image processing systems consists of ADSP, CODEC, EPROM,
RAM serial port and one level converter.
FUNCTIONING
The image data of the image to be processed is downloaded from the
PC to the ADSP.
The image data from the PC is processed in the ADSP processor (either
filtering or edge detection process) and than the kit on reset, the
processed image can be viewed on the VDU.
APPLICATIONS
Image processing is popular in applications like
1. Remote sensing via satellites
2. Radar
3. Sonar

22. IMAGE PROCESSING SYSTEM ADSP
TWO DIMENSIONAL FILTERS

23. NOISE/ ECHO CANCELLOR
AIM
The aim of the project is to develop an adaptive filter to eliminate
echo/noise .The adaptive filter is implemented in ADSP based system.
THEORY
Normally, in FIR filter, the filter coefficients are constant. But in the
adaptive FIR filters, the filter coefficients will be adjusted or adapt itself
to minimize the errors.
Thus when we employ adaptive filter for echo/noise cancellation, the
FIR filter coefficients are adjusted in every cycle to remove the
echo/noise from the input. In this project Least Mean Square (LMS)
algorithm is used for adaptive filter.
HARDWARE
The physical system consists of a DSP microprocessor ADSP, CODEC,
EPROM, RAM, Amplifiers, Mic, and Speaker. The CODEC has been
interfaced to ADSP processor through its serial port.
In this system additional serial port has been developed using the buffer
and latch to provide serial communication with PC serial port.
The TTL logic levels of serial port are converted to RS-232 logic levels
using converters so that the system can directly communicate with the
standard serial port (com1/com2) of the Personal Computer (PC).
SOFTWARE
The system software and the adaptive filter LMS algorithm are
developed in ADSP assembly language using PC.
The Assembly language programs are compiled using ASM21
Assembler and converted to machine code which are either
permanently stored in EPROM or downloaded to the ADSP system
through PC serial interface.

24. FUNCTIONING
The analog input signal from the mic are amplified and fed to the
CODEC. The CODEC converts the analog signal into digital and
transfers the data to DSP microprocessor.
In order to demonstrate echo/noise cancellation, first processor
generates an echo/noise and mix with the input signal and the resultant
signal is output to speaker.
Then using the interrupt adaptive filter algorithm is enabled and the
combined signal is processed by the adaptive filter and the filtered
signal is output through speaker. We can observe the gradual
elimination of echo/noise.
APPLICATIONS
The Adaptive filter is widely used in applications like
1. Digital audio
2. Digital graphical equalizer
3. Noise removal in transmission channels
4. High speed modem
5. Echo cancellation in transmission channels.
ADSP
Adaptive Digital Signal Processing; exclusive to SGC, a DSP technology
which processes the signal to eliminate unwanted noise and improve
incoming signal
DSP
DSP stands for Digital Signal Processor. DSP chips are widely used in sound
cards, fax machines, modems, cellular phones, high-capacity hard disks and
digital TVs. DSP chips are used in sound cards for recording and playback
and speech synthesis. Other audio uses are amplifiers that simulate concert
halls and surround-sound effects for music and home theater
Digital Signal Processing uses mathmatics to operate on a digital signal (such
as a digital audio stream) to generate some type of altered output. DSP is
used heavily in software and hardware effects processing.
DSP chips are found on an increasing number of sound cards to provide extra
audio processing power and help relieve the computers CPU of this type of
work, much like a 3D graphics accelerator would for rendering 3D graphics

25. NOISE/ ECHO CANCELLOR

26. SPEECH COMPRESSION AND
DECOMPRESSION USING ADPCM
TECHNIQUE
BASICS
Speech coding may be defined as a digital representation of the
speech signal that provides efficient storage, transmission, recovery
and faithful reconstruction of the original speech.
The speech compression is achieved by representing each sample of
digitized data by lesser number of bits. For maintaining the voice
quality the speech sample has to be represented by 13 to 16 bits.
In compression techniques the 13 to 16 bits data is represented by
an equivalent 4 or 8 bit data. In decompression techniques the
compressed data is converted back to original data. One of the
important requirement in these techniques is that the voice quality
has to be maintained.
HARDWARE
This project is proposed to develop an efficient hardware to
implement the powerful and versatile ADPCM speech compression
and decompression algorithm.
The hardware required for speech compression and decompression
have been developed using powerful DSP processor ADSP-2105.
The speech processing system consists of ADSP - 2105, CODEC,
EPROM, RAM, Amplifier sections, mike and speakers.
FUNCTIONING
The system is ready to accept speech signal once it is reset. The
speech segment to be compressed is fed as input through
microphone. The analog speech signal is digitized by CODEC,
compressed by ADSP-2105 and stored in RAM.
The decompression process can be started by interrupting the
processor.

27. When the processor is interrupted, the information in memory is
fetched by the processor and decompressed and is then fed to
CODEC. The CODEC converts the digital signal to analog signal.
The analog signal is amplified and output through the speaker.
FEATURES
The speech compression and decompression techniques are
implemented in cellular phones, voice mail transmission systems and
speech recognition system.
What is ADPCM
Adaptive delta pulse code modulation. An audio compression
algorithm for digital audio based on describing level differences
between adjacent samples
Adaptive Differential Pulse Code Modulation is an audio encoding
compression technique that encodes the difference between the
predicted value of the signal instead of the absolute value of the
original waveform so that the compression efficiency is improved.
This difference is usually small and can thus be encoded in fewer bits
than the sample itself. ADPCM is used in PC sound cards, on CD-i
and CD-ROM XA discs
CODEC
Codec is an abbreviation for Coder-Decoder. It's an analog-to-digital
(A/D) and digital-to-analog (D/A) converter for translating the signals
from the outside world to digital, and back again
ADSP
Adaptive Digital Signal Processing; exclusive to SGC, a DSP
technology which processes the signal to eliminate unwanted noise
and improve incoming signal

28. DSP
DSP stands for Digital Signal Processor. DSP chips are widely used
in sound cards, fax machines, modems, cellular phones, high-
capacity hard disks and digital TVs
DSP chips are used in sound cards for recording and playback and
speech synthesis. Other audio uses are amplifiers that simulate
concert halls and surround-sound effects for music and home theater
Digital Signal Processing uses mathmatics to operate on a digital
signal (such as a digital audio stream) to generate some type of
altered output. DSP is used heavily in software and hardware effects
processing.
DSP chips are found on an increasing number of sound cards to
provide extra audio processing power and help relieve the computers
CPU of this type of work, much like a 3D graphics accelerator would
for rendering 3D graphics

29. VOICE COMPERSION USING ADSP
What is Voice Compression
The conversion of an analog voice signal into a digital signal using minimum
bandwidth, Process by which the high statistical correlation between
consecutive voice samples is used to create a variable quantizing scale.
ADPCM can encode analog voice samples into high - toll - quality digital
signals
DSP Processor are widely used for analog signal processing such as
filtering, compression of voice signal and image processing. The processor
has powerful instruction sets and most of the instructions are one cycle
execution. So that the result can be obtained much faster and efficient,
which is required for Analog signal processing.
In this project, we are using ADSP (DSP) processor for voice
compression and retrieving.
This voice signal is picked up by microphone and it is amplified by the Pre-
Amplifier to 0-5V level. The amplified signal fed to CODEC. The CODEC has
an ADC (Analog Digital Converter), which receives the signal from pre-amp
and converts it in to Digital data.
The Converted digital data is encoded in serial format and transmitted to
DSP processor by the CODEC. The CODEC and DSP processor are linked
by synchronized serial port.
The processor has two memory blocks externally, Data memory and Boot
memory. On power on reset the program from the Boot memory (which is
developed and stored in EPROM) is loaded to the internal Program memory
of the processor. After the completing loading sequence it starts executing.
The program is developed such that to receive the data from CODEC and
compress it using Linear Predictive Coding (LPC).
The compressed data are stored in external data memory (DM). When the
IRQ pin is asserted the data from DM is read and expanded. The expanded
data is transmitted to the serial Port (to CODEC)
The CODEC receives the data and decodes it. The decoded data is fed to
DAC (which is build-in CODEC). And the DAC reproduces the exact analog
signal and amplified by the Audio Power Amplifier

30. What is ADPCM
Adaptive delta pulse code modulation. An audio compression algorithm for
digital audio based on describing level differences between adjacent
samples
Adaptive Differential Pulse Code Modulation is an audio encoding
compression technique that encodes the difference between the predicted
value of the signal instead of the absolute value of the original waveform so
that the compression efficiency is improved.
This difference is usually small and can thus be encoded in fewer bits than
the sample itself. ADPCM is used in PC sound cards, on CD-i and CD-ROM
XA discs
CODEC
Codec is an abbreviation for Coder-Decoder. It's an analog-to-digital (A/D)
and digital-to-analog (D/A) converter for translating the signals from the
outside world to digital, and back again
ADSP
Adaptive Digital Signal Processing; exclusive to SGC, a DSP technology
which processes the signal to eliminate unwanted noise and improve
incoming signal
DSP
DSP stands for Digital Signal Processor. DSP chips are widely used in
sound cards, fax machines, modems, cellular phones, high-capacity hard
disks and digital TVs
DSP chips are used in sound cards for recording and playback and speech
synthesis. Other audio uses are amplifiers that simulate concert halls and
surround-sound effects for music and home theater
Digital Signal Processing uses mathmatics to operate on a digital signal
(such as a digital audio stream) to generate some type of altered output.
DSP is used heavily in software and hardware effects processing.
DSP chips are found on an increasing number of sound cards to provide
extra audio processing power and help relieve the computers CPU of this
type of work, much like a 3D graphics accelerator would for rendering 3D
graphics

31. The block diagram is shown below.
MIC
PRE
DATA ADSP AMP
MEMORY 2105
DSP
CODEC
BOOT SPK
MEMORY
PWR
AMP