Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_63929 ( "Call sign" text, "Broadcast channel" real, "Digital PSIP" real, "Cable channel" real, "Network" text )

### Question ###
What is the Digital PSIP for channels over 15 with callsign CFTU-DT?

### Accurate SQL ###

SELECT "Digital PSIP" FROM table_63929 WHERE "Broadcast channel" > '15' AND "Call sign" = 'cftu-dt'