Abstract: A videoconferencing system uses an audio input unit including: two directional microphones disposed in directions with directivity being opposite to each other, the microphones forming a pair and a plurality of the pairs being located with directivity shifted from each other, cancellation elements for canceling sound components of the same phase from sounds inputted to the microphones of the pair, extraction elements for extracting sound components of voice band from sounds inputted to the microphones of the pair, a calculation element for calculating a difference between levels of the sound components of voice band extracted by the extraction elements to decide the microphone which has the larger level in the pair having the largest level difference, and selection elements for selecting sounds as input sound, in which the sound components with the same phase are canceled by the cancellation elements from sound inputted to the microphone decided by the calculation element.

Abstract: A videoconferencing system uses an audio input unit including: two directional microphones disposed in directions with directivity being opposite to each other, the microphones forming a pair and a plurality of the pairs being located with directivity shifted from each other, cancellation elements for canceling sound components of the same phase from sounds inputted to the microphones of the pair, extraction elements for extracting sound components of voice band from sounds inputted to the microphones of the pair, a calculation element for calculating a difference between levels of the sound components of voice band extracted by the extraction elements to decide the microphone which has the larger level in the pair having the largest level difference, and selection elements for selecting sounds as input sound, in which the sound components with the same phase are canceled by the cancellation elements from sound inputted to the microphone decided by the calculation element.

Abstract: A magnetic card handling apparatus has a rotatable capstan and a magnetic head spaced apart a distance exceeding the thickness of a magnetic card on appropriate sides of a card running groove until the presence of a magnetic card therebetween is detected. The distance between the capstan and the magnetic head is thereupon decreased whereby the magnetic card is pinched between the magnetic head and the capstan and is driven past the magnetic head for recording/or reproduction of signals. Separate card running grooves with associated reproduce and record heads and separate card detecting apparatus may be provided for reproduction and recording to permit dubbing signals reproduced from one magnetic card onto another magnetic card.