Subject: Re: Upper/lower freq bounds for speech M/F/children ?? From: Bob Masta <audio(at)DAQARTA.COM> Date: Wed, 7 Sep 2005 09:19:01 -0400Traditionally, telephone line response has been limited to 300-3000 Hz. On the low end, the voice fundamental is cut off (at least for most males) but we don't notice it because the harmonics are there for a good "missing fundamental" effect. On the high end you only lose a bit from the sibilants, in exchange for removing a lot of background noise. Best regards, ----------------------------------------------------- On 7 Sep 2005 at 9:59, Richard H. wrote: > Hi, > > Hearing aids can boost frequencies up to about 8KHz. > > However very low frequencies and higher frequencies do not need to be boosted because they are outside the main speech areas. > > However can anyone suggest a pragmatic lower & upper bound "cutoff" frequency where we don't really need to boost speech sounds? > > The upper speech frequency of very young, female speakers I assume would be the upper limit ... does anyone know this frequency? > > How about the lower end? What low frequencies do we not need to boost? I assume this would correspond to the lowest freq edge of a deep adult male voice. > > Thanks! > > Richard > Bob Masta audioATdaqartaDOTcom