Title: Voice controlled disappearing audio delay line

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Claims: What is claimed is:

1. A voice-controlled disappearing audio delay apparatus for use with a voice scrambler transmitter, the combination comprising:

a. input means for receiving voice generated signals;

b. first means coupled to said input means for delaying the incoming voice signal for a predetermined time duration equal to the time required for a scrambler preamble to be transmitted,

c. second means coupled to said input means and to said first means for incrementally removing the delay of the voice signal in response to pauses of predetermined time durations in said voice generated signals.

2. The apparatus of claim 1 and further comprising digitizing means coupled to said input means and to said second means for digitizing the voice generated signals before being coupled to said first means.

3. The apparatus of claim 2 wherein said first means comprises a plurality of delay means to form at least one delay line.

4. The apparatus of claim 3 wherein said second means comprises circuit means responsive to pauses of a predetermind time duration in a voice signal message to remove a portion of said delay line each time a pause occurs.

5. The apparatus of claim 3 wherein said delay line comprises a plurality of shift registers each controlled by a gate circuit and being connected so that every gate in the delay line is a possible feedpoint for the delay line and only one gate is opened for passing a signal at any time.

6. The apparatus of claim 5 wherein said second means includes multiplexer circuit means having a plurality of outputs corresponding to the number of gate circuits and said multiplexer providing a plurality of gate pulses in response to succeeding pauses in the voice signal to successively feed the voice signal to one less shift register until the nth shift register is the feedpoint and the voice signal is fed without delay to the output.

7. The apparatus of claim 6 wherein said second means includes a signal sorter circuit responsive to a pause in the voice signal of a predetermined time duration for providing a shift pulse to said multiplexer.

8. A voice-controlled disappearing audio delay apparatus for use with a voice scrambler transmitter, the combination comprising:

a. an input terminal for receiving voice generated signals,

b. a voice signal activated switch connected to said input for providing first and second output signals,

c. an analog to digital converter connected to said input terminal for providing a plurality of digital outputs,

d. a digital-to-analog converter having a plurality of inputs equal to the number of outputs of said analog-to-digital converter,

e. a plurality of delay lines connecting the outputs of said analog to digital converter to the inputs of said digital-to-analog converter for delaying each bit from said analog-to-digital converter the same,

f. a pulse sorter connected to said voice controlled switch for generating an output pulse when the output signal from said switch is below a predetermined value for a predetermined time duration,

g. each of said delay lines comprising a plurality of gate circuits having their data inputs connected in parallel to one of the outputs of said analog-to-digital converter,

h. a shift register associated with each of said gate circuits, said shift register being serially connected so that any of said gate circuits can be a feedpoint from the outputs of said analog-to-digital converter.

9. The apparatus of claim 8 and further comprising a multiplexer circuit having an input connected to said pulse sorter circuit and a plurality of outputs, each of which is connected, respectively, to one of said gate circuits for providing output pulses in response to an output from said pulse sorter to shift the feedpoint to said shift registers.

Other info:

Inventors: Johnson, George B. (La Jolla, CA, US)

Application Number: 581060
Filing Date: 1975-05-27
Publication_date: 1976-07-20
Assignee: The United States of America as represented by the Secretary of the Navy (Washington, DC)
Primary Class(es): 380/31 380/35, 380/275
Other Classes:
US Patent Ref:

2539556	Jan, 1951	Steinberg	179/1.
3694757	Sep, 1972	Hughes	178/22.
3813493	May, 1974	Hughes	179/1.

Other Refs:
Primary Examiner: Claffy, Kathleen H.
Assistant Examiner: Kemeny, E. Matt
Attorney: Sciascia; R. S., Rubens; G. J., Phillips; T. M.