No hands voice instruction for EEG telemetering system

• US 3,886,314 A
• Filed: 09/20/1973
• Issued: 05/27/1975
• Est. Priority Date: 09/20/1973
• Status: Expired due to Term

• Current Assignee: John R. Pori
• Original Assignee: John R. Pori
• Inventors: Pori, John R.
• Primary Examiner(s): Claffy, Kathleen H.
• Assistant Examiner(s): D'Amico, Thomas
• Application Number:
  US05/399,241
• Time in Patent Office: 614 Days
• Field of Search: 179/1C,2A,2C,2DP,6R 178/58R,59
• US Class Current: 379/106.02
• CPC Class Codes: A61B 5/0006 ECG or EEG signals
• CPC Class Codes: H04M 11/002 with telemetering systems telemetering in general G08C
• CPC Class Codes: Y10S 128/904 Telephone telemetry

Abstract

A no hands voice instruction system for specific use in an EEG telemetering system in which the EEG signal is FM modulated on several carrier frequencies and where a voice instruction signal is transmitted from the receiving end to a loudspeaker at the transmitting end of the system. The frequency modulated data information is prevented from being reproduced by the loudspeaker by means of a nulling arrangement in which the FM data channel signal is applied to both inverting and noninverting inputs of an operational amplifier one side of which is coupled to a telephone line pair over which the voice instructions are transmitted from the receiving end of the system. The loudspeaker is connected to the output of the operational amplifier.

Claims

1. A telemetering system for transmitting multi-channel data over a transmission medium whIch is a single voice quality communications channel and where said multi-channel data frequency modulates a unique carrier frequency for each data channel for providing a frequency modulated signal for transmission over said communications channel said system including receiving means coupled to said voice channel for demodulating said frequency modulated signal and displaying such multi-channel data for interpretation the improvement in said system comprising:

transmitter means for coupling said frequency modulated (FM) signal to said voice communications channel and including first amplifier means for coupling said FM signal to said voice channel and having a gain for amplifying such signal to a predetermined level suitable for transmission over said voice channel;

operational amplifier means having an inverting input and a noninverting input;

means for coupling voice instruction signals transmitted from said receiving means over said voice channel to one of said inputs;

second amplifier means for coupling said FM signal to the other input of said operational amplifier means and having substantially the same gain as said first amplifier means for matching said predetermined level; and

loudspeaker means coupled to the output of said operational amplifier for receiving said voice instruction signals said inverting and noninverting inputs nulling out said FM signal.

2. A system as in claim 1 including an adjustable attenuator coupled between said second amplifier and said other input.

3. A system as in claim 1 where said receiving means includes a telephone headset with exclusion key for transmitting said voice instruction signals to said loudspeaker.