초록 ▼

Method and apparatus for aiding hearing are disclosed comprising an automatic gain control unit which includes a first section for increasing the amplitude of input signal segments that are below a threshold level, and a second section for reducing the amplitude of input signal segments that are abo

Method and apparatus for aiding hearing are disclosed comprising an automatic gain control unit which includes a first section for increasing the amplitude of input signal segments that are below a threshold level, and a second section for reducing the amplitude of input signal segments that are above said threshold level. Both sections have short attack and long release time constants. A long attack short release time constant noise suppressor unit responsive to the output from the second section and having a threshold level of operation below that of the threshold level of the automatic gain control units passes speech signals and squelches background noise signals between speech signal segments for improved understandability of speech signals.

대표청구항 ▼

A method of aiding hearing by reducing the level of background noise signals between speech signal segments of an input signal, comprising reducing the long-time average intensity level of input signal segments that are above a predetermined long-time average level with substantially linear gain ove

A method of aiding hearing by reducing the level of background noise signals between speech signal segments of an input signal, comprising reducing the long-time average intensity level of input signal segments that are above a predetermined long-time average level with substantially linear gain over a predetermined range of short-time averaged level segments of the input signal, amplifying those long-time averaged segments of the input signal that are not reduced in level to increase the long-time averaged level thereof to said predetermined long-time averaged level, following the above adjustments to temporal segments of the input signal, reducing the signal level when the long-timed averaged level segments thereof exceed a predetermined level below said predetermined long-time average level for reducing the level of background noise signals between speech signal segments.