公开(公告)号：US4511767A

公开(公告)日：1985-04-16

申请号：US487299

申请日：1983-04-21

申请人： David L. Wetzel ,  Mahesh Shah

发明人： David L. Wetzel ,  Mahesh Shah

IPC分类号： H04M9/00 ,  H04M1/72

CPC分类号： H04M9/003

摘要： A key telephone system having a plurality of telephone station sets for selective connection to first or second telephone lines. The system includes a control unit which detects the presence of on-hook conditions on the lines, and transmits control signals in selected time slots to each of the station sets over a single control line to indicate the off-hook/on-hook status of the lines. The system may include circuitry at each station set for transmitting additional control signals in other selected time slots over the single control line to identify privacy release of the telephone line connected thereto.

摘要翻译： 一种密钥电话系统，具有用于选择性地连接到第一或第二电话线路的多个电话台组。 该系统包括一个控制单元，该控制单元检测线路上是否存在挂机状态，并且通过单个控制线路将选定时隙中的控制信号发送到每个站组，以指示摘机/挂机状态 线条。 该系统可以包括在每个站设置用于通过单个控制线路在其他选定的时隙中发送附加控制信号的电路，以识别与其连接的电话线路的隐私释放。

公开(公告)号：US4883963A

公开(公告)日：1989-11-28

申请号：US856289

申请日：1986-04-28

申请人： Gabor J. Kemeny ,  David L. Wetzel

发明人： Gabor J. Kemeny ,  David L. Wetzel

IPC分类号： G01N21/27 ,  B21B37/30 ,  G01J1/44 ,  G01J3/12 ,  G01J4/00 ,  G01N21/35 ,  G01N21/47

CPC分类号： G01N21/85 ,  G01J3/1256 ,  G01N21/4738 ,  G01J2001/4242 ,  G01J4/00 ,  G01N2021/1742 ,  G01N2021/4742 ,  G01N21/3563 ,  G01N21/4785 ,  G01N2201/065 ,  Y10S359/90

摘要： The optical reflectance or transmittance concentration analyzer includes an acousto-optical tunable filter (AOTF). The AOTF is tuned by a computer controlled digital-to-analog converter through a tunable sweep oscillator. Tuned beams can be selected according to their direction of propagation or according to their polarization behavior. Therefore, if desired, a pair of crossed polarizers can be used to select one of the tuned monochomatic light beams that pass from a light source through the AOTF. To obtain rapid wavelength change along with electronic chopping or wavelength modulation, the digital-to-analog converter output is combined with the output of a high speed signal generator. The modulated light is conducted directly or through a fiber optic cable to the location of the optical measurement and impinges upon the sample where it is reflected or transmitted. The emerging light is collected onto detector(s). The measurement time interval can be distributed among the required wavelengths or wavelength pairs according to an unequal scheme to decrease the error of the result in a calibration equation. The apparatus is particularly adaptable for use as an on-line concentration monitor in industrial process control because of its stability, efficiency and ability to perform quick analyses.

公开(公告)号：US4499338A

公开(公告)日：1985-02-12

申请号：US487295

申请日：1983-04-21

申请人： David L. Wetzel

发明人： David L. Wetzel

IPC分类号： H04M9/00 ,  H04M1/72 ,  H04M1/68

CPC分类号： H04M9/003

摘要： A key telephone system having a plurality of telephone station sets for selective connection to a plurality of telephone lines. At least one set having circuitry for transmitting in a selected time slot on a control line, a signal requesting a hold state on the telephone line connected to the set. The system includes a control unit which upon detecting the signal requesting the hold state places a hold network on the telephone line and continues to transmit the signal in the selected time slot. Each of the telephone sets includes circuitry which is responsive to the signal in the selected time slot for indicating the hold status of the telephone line.

摘要翻译： 一种具有多个电话台组的密钥电话系统，用于选择性地连接到多个电话线路。 至少一组具有用于在控制线上的选定时隙中发送的电路，该信号请求在连接到该组的电话线上的保持状态。 该系统包括控制单元，其在检测到请求保持状态的信号时将保持网络放置在电话线路上，并且在所选择的时隙中继续发送信号。 每个电话机包括响应所选择的时隙中的信号以指示电话线的保持状态的电路。