Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What was the aspect ratio if the vertical pixel is 480 and pixel aspect ratio is 1:1?

### Inputs:
table_name: table, columns: ['Vertical', 'Horizontal', 'Aspect ratio', 'Pixel aspect ratio', 'Scanning', 'Frame rate ( Hz )']

### Response:
SELECT Aspect ratio FROM table WHERE Vertical = 480 AND Pixel aspect ratio = 1:1