Harold E Walker

US Patent:

6445737, Sep 3, 2002

Filed:

Jan 31, 2002

Appl. No.:

10/062030

Inventors:

Harold Walker - Edison NJ 08820

International Classification:

H03K 704

US Classification:

375239, 332112

Abstract:

A wireless digital transmission and receiving method combines phase reversal keying with pulse position modulation. Modulation of a transmitted signal implements pulses that are of extremely short duration to indicate ones and zeros. These pulses can be as narrow as one cycle of the carrier frequency. As such, they often appear as missing cycles or pulses in a sequence of carrier cycles. The method synthesizes a sideband with no carrier or other sidebands from the carrier of an input signal. This synthesized sideband is represented by a broad sinx/x spectrum with a principal power peak at the modulated frequency and numerous weaker peaks of varying frequencies and peak levels. The time duration of these smaller peaks is such that they have negligible mean power levels. Thus, the synthesized signal can withstand the degradation caused by multipath interference and fading. The weaker peaks also do not cause measurable interference with other communications devices.

US Patent:

6748022, Jun 8, 2004

Filed:

Jul 5, 2000

Appl. No.:

09/612520

Inventors:

Harold R. Walker - Edison NJ 08820

International Classification:

H04L 2504

US Classification:

375289

Abstract:

A method of modulating a phase reversing pulse train including a plurality of signal pulses each having an associated period of a given temporal duration to encode a multiplicity of input data bits each having a data state, and prevent losses of clock timing. The method includes the steps of: identifying select ones of the input data bits which repeat the data state of a respectively preceding one of the input data bits; identifying select ones of the pulses which correspond to the select bits; and, alternately shortening and lengthening the periods associated with the select ones of the pulses.

US Patent:

7424065, Sep 9, 2008

Filed:

Oct 21, 2003

Appl. No.:

10/689911

Inventors:

Harold R. Walker - Edison NJ, US

International Classification:

H04L 27/20

US Classification:

375308

Abstract:

A wireless digital transmitting and receiving method and apparatus combining abrupt phase change modulation with an ultra narrow band filter to remove the sidebands, resulting in a single frequency being transmitted to carry the data. The method examines and detects the changes in the carrier product only, after filtering to remove or reduce all sidebands, to obtain a usable signal. Only a single frequency with phase changes is transmitted. An ultra narrow band filter, having a rapid rise time and near zero group delay, passes the near instantaneous modulation changes of phase in the carrier.

US Patent:

7268638, Sep 11, 2007

Filed:

Apr 22, 2003

Appl. No.:

10/420124

Inventors:

Harold R. Walker - Edison NJ, US

International Classification:

H03K 7/00

US Classification:

332106, 332109, 332112, 375239

Abstract:

The invention is a method for pulse position modulating signals which are synchronized to clocked bit periods using a clock comprising the steps of generating two, three or n signals to mark the presence of digital ones during corresponding n time slots occurring during the same bit period. The two, three or n signals are combined into a single data channel to utilize abrupt phase changes of pulses in a carrier signal at a carrier frequency, the phase changes having a very short duration to mark the presence of digital ones only. The combination of the n signals into a single data channel comprises gating each of the n signals in a sequence of serially delayed time slots corresponding to each of the n signals during a portion of the same bit period in the single data channel during time positions reserved for unexpressed zeroes.

US Patent:

20030012301, Jan 16, 2003

Filed:

Jul 18, 2002

Appl. No.:

10/181510

Inventors:

Harold Walker - Edison NJ, US

International Classification:

H04L027/12

US Classification:

375/305000

Abstract:

The invention is a method whereby a digital data bearing signal, comprising a single frequency generated by encoding a nonreturn-to-zero (NRZ) signal so as to cause it to have no frequency spread, is added to the signals presently being transmitted over cellular telephone systems. The signal to be added is comprised of a single frequency, which alternates in phase at coded time intervals. The channels () presently in use have bandwidth limits specified by regulatory authorities, which have a small guard space () between them. The single frequency signal, which carries data at high data rates, can be added between these channels in a way that will not interfere with the channels in use. Frequency-hopping spread-spectrum is used to further reduce any interaction between channels.

US Patent:

20070237218, Oct 11, 2007

Filed:

May 24, 2007

Appl. No.:

11/807077

Inventors:

Harold Walker - Edison NJ, US

International Classification:

H03H 7/38
H04L 27/20

US Classification:

375229000, 375308000

Abstract:

A method and apparatus for transmitting information combining abrupt phase change modulation with an ultra narrow band filter to remove unnecessary Fourier sidebands, resulting in a single frequency being transmitted to carry data. The method examines and detects the changes in the carrier phase only, after filtering to remove or reduce all sidebands, to obtain a usable signal. Only a single frequency with phase changes is transmitted. An ultra narrow band filter, having a rapid rise time and near zero group delay, passes the near instantaneous modulation changes of phase in the carrier.

US Patent:

46420703, Feb 10, 1987

Filed:

Sep 19, 1985

Appl. No.:

6/777908

Inventors:

Harold L. Walker - Dunedin FL

International Classification:

B62M 908

US Classification:

474 57

Abstract:

A multi speed transmission mechanism for use on a bicycle, for example, wherein pressure on the pedal by the operator decreases or increases the diameter of the driver sprocket wheel to alter the gear ratio correspondingly. The sprocket is provided with opposed segments which are linked to both the sprocket wheel and an inner control disc. The segments move radially outwardly or inwardly in unison responsive to limited rotation of the control disc independently of rotation of the sprocket. Such rotation is foot controlled by the operator. Pressure on the foot pedal by the operator increases or decreases the working length of the bicycle sprocket chain by making the effective diameter of the sprocket smaller or larger. This alters the gear ratio correspondingly. The gear ratio may be maintained without change by a locking device on the sprocket wheel in contact with the control disc.

US Patent:

51857650, Feb 9, 1993

Filed:

Jul 23, 1990

Appl. No.:

7/557322

Inventors:

Harold R. Walker - Edison NJ

International Classification:

H04L 2549

US Classification:

375 22

Abstract:

An improved binary data communication system employs an improved VPSK encoding procedure wherein each input data bit has a bit period of M clock periods, and the data bit polarity changes are phase shift key coded with waveform widths of M/M, M+1/M, and M+2/M bit periods wherein M is an even integer greater than 3. Each of the data bits (except the last one in an encoding cycle) is encoded in an encoding signal which switches back and forth between "1" and "0" polarities and has assigned widths representing whether or not the polarity of the data bit is changed from that of the previous data bit, and whether it is the last (M-1th) polarity change in the encoding cycle. At the receiving end, a complementary procedure is used to decode the encoded signal. For transmission, the encoded signal is filtered for higher order harmonics and integrated in order to provide a sine wave output shifted 90 degrees in phase. Upon reception, the received signal is differentiated and a zero crossover detector is used to regenerate the encoded signal for decoding.

Author:

Harold Walker

ISBN #:

0926557122

Author:

Harold Blake Walker

ISBN #:

0528818643