公开(公告)号：US5784436A

公开(公告)日：1998-07-21

申请号：US668023

申请日：1996-06-19

Applicant: Howard B. Rosen ,  Daniel S. Leitman

Inventor： Howard B. Rosen ,  Daniel S. Leitman

IPC: H04M1/654 ,  H04M1/656 ,  H04M3/42 ,  H04M1/64

CPC classification number: H04M1/656 ,  H04M1/654 ,  H04M3/42221

Abstract: An automatic telephone recorder includes a computer equipped with a sound signal handling feature and a digital recording medium such as a disk drive. The sound signal handling feature includes an audio input, an audio output and programmable means for selectively effecting digital recording on the recording medium of an audio signal applied to the sound signal handling means input. A line transformer is connected between a telephone line pair and the sound signal handling means audio input. The sound signal handling means is programmed to periodically test the sound signal handling means audio input to determine if audio or a predetermined transient signal, indicating that the telephone line has gone from an on-hook condition to an off-hook condition, is present. If the audio or transient signal is present, the sound signal handling means is programmed to institute recording of any audio signal present at the sound signal handling means audio input for as long as such audio remains. In one embodiment, a pulse stretcher circuit responds to sensing the presence of the pulse by generating a time-extended signal which the sound signal handling means can sample, thus relieving the computer from the necessity to continuously sample the transient signal source at a relatively high rate which ties up the central processor resources.

Abstract translation: 自动电话记录器包括配有声音信号处理功能的计算机和诸如磁盘驱动器的数字记录介质。 声音信号处理特征包括音频输入，音频输出和用于选择性地对应用于声音信号处理装置输入的音频信号在记录介质上进行数字记录的可编程装置。 线路变压器连接在电话线对和声音信号处理装置音频输入之间。 声音信号处理装置被编程为周期性地测试声音信号处理装置音频输入，以确定指示电话线是否已经从挂机状态到摘机状态的音频或预定瞬态信号。 如果存在音频或瞬态信号，则声音信号处理装置被编程为对存在于声音信号处理装置音频输入端的任何音频信号进行记录，只要这样的音频保留。 在一个实施例中，脉冲展宽电路响应于通过产生声音信号处理装置可以采样的时间延长信号来感测脉冲的存在，从而减轻计算机不必在较高的时间连续采样瞬态信号源 中央处理器资源的速率。