I've never heard any Japanese programming (though a few words obviously) on the NHK channels on 58W. Every time I've looked, all 4 channels have had identical programming in English. One exception, I do remember seeing a show that taught Japanese, so both English and Japanese were spoken during that show. Everything else I've come across has had English on the channel that scans in as Japanese. Like FTA4PA says, no other choice of audio track.
A long time ago there use to be two analog video channels, one NTSC, and one PAL, but even then, they were both in English, iirc.