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SPECIAL TOPIC - IPOD
Team Members: 1PI14TE001 Aamir Hasan
1PI14TE002 Aishwarya V
1PI14TE004 Amogh Manjunath
1PI14TE013 Haripriya N.S.
1PI14TE037 Rahul Kishen D
1PI14TE046 Srinidhi Bharadwaj K.S.
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What is an Audio Player?
AnAudio Player is any hardware device that is
capable of handling audio playback in digital form.
In recent times, Audio Players are commonly
referred to as MP3 Players or portable music
players.
It usually consists of a microcontroller and
other peripheral devices such as a Speaker, LED
Screen, Memory to provide the major functions.
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History of Audio Players
The road that leads us from Edison's tin-foil cylinder to today's IPOD is a fascinating avenue cramme
inventions and innovations. Our past accomplishments contribute to what we are today, and signpost the future a
push the envelope of what is possible in the audio world.
A Brief Timeline .
1877 : Thomas Alva Edison, working in his lab, succeeds in recovering Mary's Little Lamb from a strip of
spinning cylinder.
1887 :Emile Berliner is granted a patent on a flat-disc gramophone, making the production of multiple
copies practical.
1888 : Edison introduces an electric motor-driven phonograph.
1895 : Marconi successfully experiments with his wireless telegraphy system in Italy, leading to the first
transatlantic signals.
1898 :Valdemar Poulsen patents his "Telegraphone, recording magnetically on steel wire.
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History of Audio Players (Contd)1925 : Bell Labs develops a moving armature lateral cutting system for electrical recording on disk. The first
rpm disks appear.
1933 : Magnetic recording on steel wire is developed commercially. Snow, Fletcher, and Steinberg at Bell Labs
city stereo audio program.
1943 : Altec develops their Model 604 coaxial loudspeaker.
1954 : I.D.E.A. released the very first portable transistor radio. The Regency TR-1 radio measured
3 x 5 x 1.25 and featured an analog AM tuner. In a strange prediction of things to come, the
Regency came out in a variety of colors over the years, ranging from a simple bone white to
pearlescent lavender and lime colors(much like the ipod).
1962 : Henry Kloss develops the first portable stereo.The Model 11 was the first transistorized
stereo system, and featured a record player, amplifier and two speakers which all folded neatly into a
suitcase for easy transportation. While the stereo only ran on A/C power, not batteries, it still was a
milestone in the development of portable music players.
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History Of Audio Players (Contd)1965 : Philips Compact Cassette and the Norelco Carry-Corder 150 : Philips released the first
ever compact cassette tape. Originally designed for recording dictations and other boring stuff, the
cassette recorded up 45 minutes of sound on single 1/8-inch tape. To compliment their innovation inrecording media, they released the battery-powered Carry-Corder 150 cassette recorder.
1980 : Sony Walkman TPS-L :Sony created the Walkman. Its real innovation was its size, measuring
only slightly larger than a cassette tape itself(much like the Japanese-small and powerful). Featuring a pair
of portable, lightweight headphones and operating on AA batteries, it ushered in a new era of portability.
As cds overtook cassette tapes in both sound quality and popularity, sony saw the need to update popular
walkman line for a new gen. Sony introduced their D-50 portable CD player, the first ever portable digital
music player.
2001 : Apple, looking at what other companies were doing wrong and to vastly improve upon their
mistakes, released their iPod, combined a 5GB hard drive with a rechargeable battery pack and a
groundbreaking user interface. The iPod wasn't that different under the hood from other MP3 players, but it
had a sleek design, a unique and simple navigational system, and the Apple brand name to back it all up.
Only time will tell how portable media players will evolve. With innovations like touchscreens, high
definition video playback, wireless streaming, low cost solid state memory and more on the horizon, the
first 50 years were just the beginning.
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Description of Our Audio Player
The components used in the Audio Player designed are:
Microcontroller - IC ATmega162
USBASP - ATmega8A
Display - Nokia 5110 LCD
Decoder - IC VS1011B
Switches - Push button switches
SD Card Reader
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Description of Our Audio Player (Contd)
1. Microcontroller - IC ATmega162: CMOS 8-bit Microcontroller with RISC
and Harvard architecture.
32 general purpose registers, 16kB flash
memory, total 44 pins, operating
frequency- 16Mhz, word size - 8 bit, 3
external interrupts.
EEPROM-512 Bytes,1 Kbyte of SRAM.
35 general purpose I/O lines.
4 timers, 6 PWM channels.
It has 5 ports.
Industrial temperature range - -400C to
85
0
C
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Description of Our Audio Player (Contd)
2. USBASP: USBASP is a USB in-circuit programmer for
Atmel AVR controllers. It simply consists of an ATMega8 and
few passive components. The programmer uses a firmware-only
USB driver, no special USB controller is needed.
3. Nokia 5110 LCD Display: It is a basic graph
screen. It is a 48 x 84 pixel monochrome LCD co
runs on 3.3V power supply.
Fun fact: This LCD display was also used for the
earlier nokia mobile phones.
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Description of Our Audio Player (Contd)
4. Decoder:
Contains working memory, 5 KiB instruction RAM and 5 KiB
4 general purpose I/O pins.
A high-quality variable-sample-rate stereo DAC, followed by an
amplifier and a ground buffer.
5. Switches: Four push button switches each with various functions, su
pause, stop etc.
6. SD Card Reader: It supports 3.3 V input and has a maximum data ca
above which it will fail to function efficiently.
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Schematics
DECODER: SWITCHES AND SD CARD:
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Progress Achieved
Installed drivers for USBasp anduploaded .hex code onto
microcontroller.
Interfaced LCD to the
microcontroller. Interfaced SD card and switches.
Interfaced Decoder.
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Conclusion
The Microcontroller has been interfaced with a
Decoder, Switches and SD Card Reader
functionalities are to be added and tested.