special topic - ipod - 1

7/26/2019 Special Topic - iPod - 1

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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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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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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.

special topic - ipod - 1

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