1 / 14

PHADDAR

PHADDAR. ( P ortable HA rd D isk D igital A udio R ecorder).

yuki
Download Presentation

PHADDAR

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. PHADDAR

  2. (Portable HArd Disk Digital Audio Recorder) phaddar (fad är’) noun. 1. A small electronic component that interfaces a dynamic microphone with a standard IDE hard disk. This system has the ability to record at least an hour of CD quality audio data (16 bits of resolution and a 44.1 kHz sampling rate). The data that is stored on the hard disk can be downloaded to a PC over the serial port at a later time. Advantages to the system include scalability, portability and low cost. 2. Indian word for “worthless”

  3. System Diagram

  4. System Architecture

  5. Schematic Put that here

  6. Major Components • IDE Hard Disk • Microcontroller - Microchip PIC 16HC64 • Analog to Digital Converter - Cirrus CS5331 • XLR Connectors • Serial Connector

  7. Software Architecture Recording Mode Downloading Mode

  8. Order of events for microcontroller chip in recording mode • Spin up drive • Wait for drive ready • Write LBA address to hard disk • Output recording status to LED • Send command for start sector recording • Wait for LRCK signal from A/D to go low • Send data to sector • Update end data address • Check for stop recording command from user button • Check for disk full • Loop to “Send command for start sector recording”

  9. Order of events for microcontroller in downloading mode • Setup for serial communication to computer • Wait for signal from PC to begin downloading • Send size of data string to PC (three byte LBA address of last recorded sector) • Wait for confirmation or error signal from PC • Send data stream to PC until last used sector is transmitted

  10. Objective Obtain high quality audio samples for engineering analysis at a reasonable cost.

  11. Problems With Analog Solution • Interference between consecutive recordings over the same physical portion of tape. • Loss of audio fidelity with time, as the tape wears out. • Tape Media limits true frequency response.

  12. Problems With Conventional Digital Solution • Costly • Often Requires Proprietary Interface Card • Very Limited Storage Capacity

  13. Sample Interface Timing

  14. Analog to Digital Conversion

More Related