More about ultrasonic (93)

1-10-1976 | The current trend in the TV industry seems to be the proliferation of `gadgets` for use with the TV set, and the use of the TV screen to d...

1-07-1975 | The frequency response of the human ear is limited. The purpose of the ultra- sonic detector if to overcome this limitation by changing th...

1-07-1975 | The frequency response of the human ear is limited. The purpose of the ultra- sonic detector if to overcome this limitation by changing th...