The PC speaker is normally meant to reproduce a square wave via only 2 levels of output (the speaker is driven by only two voltage levels, typically 0 V and 5 V).
For example, if your payments for March and July 2010 were each one month late, the report may continue to show (for seven years from the date after each payment was due) that you were 30 days late twice in 2010, even though the tradeline for that account also shows your payments for the rest of 2010 were made on time.
1 If your payment is more than 30 days late, the three major credit bureaus are usually notified, meaning the late payment will show up on your credit reports. 2  A late payment on your credit report could stay on your credit report for seven years. 3  It might decrease your credit score. A late payment on your credit report could stay on your credit report for seven years. 2  It might decrease your credit score. 3  Payment history information typically accounts for nearly 35% of your credit score, making it one of the single most important factors in calculating your score.