timeseries - duplicated data and problems trying to sychronize 2 timeseries with different frequencies

Dear all,

I'm quite new working with timeseries and I have two main problems:

1. Sometimes I have to work with 2 timeseries which both have data at a frequency of 1 sec. When I synchronize them, I get duplicated data for all the values (except those at the beginning). Now I'm deleting the duplicated values but I was wondering if there is a simple way to obtain directly non-duplicated results.

2. My second doubt is about how I could synchronize 2 timeseries which have different frequencies of data; one of them has data every 10 sec but the other one has data every 1 sec. So, I'd like to get synchronized timeseries with a 10 sec frequency.

I hope you can understand my questions. Otherwise, let me know and I'll try to give data examples.

Looking forward to hearing from you soon.

Thanks a lot.