https://github.com/logandhillon/audp

AUDP broadcasts digital data by encoding to analog data and unicastly streams it to other devices.
https://github.com/logandhillon/audp

audio mathematics networking python

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AUDP broadcasts digital data by encoding to analog data and unicastly streams it to other devices.

• Host: GitHub
• URL: https://github.com/logandhillon/audp
• Owner: logandhillon
• License: gpl-3.0
• Created: 2024-07-06T22:20:02.000Z (5 months ago)
• Default Branch: main
• Last Pushed: 2024-11-12T21:01:30.000Z (8 days ago)
• Last Synced: 2024-11-12T22:18:24.289Z (8 days ago)
• Topics: audio, mathematics, networking, python
• Language: Python
• Homepage: https://pypi.org/project/audp/
• Size: 35.2 KB
• Stars: 0
• Watchers: 1
• Forks: 1
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Analog Unicast Data Protocol (AUDP)

AUDP broadcasts digital data by encoding to analog data and unicastly streams it to other devices.

## Versions

### AUDP/1.0

Stores one **byte** per frame. This results in much smaller (about 8x smaller than the v0 modem) packets, but the chance of data loss is slightly higher.

Not to be used in highly noisy areas, where sonic data may be lost. The tolerance for this modem is ~35 Hz.

CTRL bytes (ASCII 0-31) has the **CTRL OFFSET** added to it's output frequency.

Because of this, frequencies less than the **CTRL CUTOFF** should be ignored.

| SPEC         | VALUE          |

| ------------ | -------------- |

| FACTOR       | 70 Hz          |

| CTRL OFFSET  | 17,920 Hz      |

| CTRL CUTOFF  | 2,170 Hz       |

| TOLERANCE    | ± 35 Hz        |

| FRAME LENGTH | 20 ms (882 Hz) |

| SAMPLE RATE  | 44,100 Hz      |

#### Example: byte `'A'` (ASCII 65)

1. Mulitply the decimal value of the byte (65) by the **FACTOR** (70 Hz) to get the output frequency of 4,550 Hz.

#### Example: CTRL byte `[SOH]` (ASCII 1)

1. Mulitply the decimal value of the byte (1) by the **FACTOR** (70 Hz) to get the output frequency of 70 Hz.

2. Add the **CTRL OFFSET** to get a final output frequency of 17,990 Hz.

### AUDP/0.9

Stores one **bit** per frame. This results in larger, longer packets, but has practically no chance of data loss.

There can be up to **~0.98 kHz** of interference, and this modem will still be able to get a clean signal.

| SIGNAL    | FREQUENCY |

| --------- | --------- |

| LOW (0)   | 6 kHz     |

| HIGH (1)  | 4 kHz     |

| END CHUNK | 2 kHz     |

| SPEC         | VALUE          |

| ------------ | -------------- |

| TOLERANCE    | ± 975 Hz       |

| FRAME LENGTH | 20 ms (882 Hz) |

| SAMPLE RATE  | 44.1 kHz       |