APPARATUS FOR QUALIFYING RECORDED TONE BURSTS

摘要

Apparatus for qualifying recorded tone bursts on tape recordings. The apparatus includes connection means for connecting the apparatus to a tape player containing a tape with recorded tone bursts thereon so that the bursts from the tape are received in sequence by the apparatus. Filter means connected to the connection means for facilitating the acceptance of the upper frequency response of each tone burst. Amplifier means in connection with the filter means to provide for the gain loss in the filter means and accommodate the lower frequency response specification of the tone burst. Detector means are connected to the amplifier means and include means for providing a voltage that is indicative of the envelope of the tone burst. A first timing means set to time out just short of a predetermined minimum burst duration to produce a pulse in response to information from the detector means. A counter connected to the first timing means and responsive to the pulse therefrom to advance one counting unit. Latch circuit means connected to the detector so that a pulse therefrom resets a latch circuit set up at the beginning of a burst. A second timing means connected to the latch circuit to be initiated by the latch circuit and set to time out in excess of a predetermined minimum burst specification time. Alarm means connected to said second timing means so that when the latch circuit is not reset and the first timing means times out, an audible alarm is triggered indicating an acceptable burst. Finally, a third timing means is connected to the detector and the alarm means to time out if the pulse exceeds a predetermined maximum duration specification.