Method and apparatus for synchronizing data transfer rate from a cathode ray tube video monitor to a portable information device
First Claim
1. A method for synchronizing the data transfer rate for downloading data from a cathode ray tube (CRT) adapted for transmission of serial data bits as light pulses appearing as spaced lines on the CRT at a selectable pulse repetition rate to a portable information device having a photosensor responsive to said light pulses with means adapted to receive and store binary coded data corresponding to said light pulses at least one fixed pulse reception rate comprising:
- (a) providing calibration output signal means in said portable information device,(b) storing a calibration character comprising a block of binary coded data in said portable information device,(c) transmitting a block of serial data bits corresponding to said calibration character in the form of light pulses appearing as spaced lines on the CRT,(d) receiving said block of serial data bits via said photosensor on said portable information device,(e) comparing said received serial data bits with said stored calibration character,(f) activating said calibration output signal means after receiving at least one match of the received data bits with the stored calibration character, and(g) selecting a new pulse repetition rate by changing the line spacing of said spaced lines corresponding to said calibration character on the CRT and repeating steps (c) through (e) in the absence of a signal from said calibration output signal means, until said new repetition rate of the CRT data transmission may be received at the fixed pulse reception rate of the portable information device.
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Accused Products
Abstract
Method and apparatus for synchronizing the data transfer rate for downloading data from a cathode ray tube (CRT) adapted for transmission of serial data bits as light pulses appearing as spaced lines on the CRT to a portable information device having a photosensor which receives and stores binary coded data corresponding to the light pulses at a fixed pulse reception rate. The CRT displays a calibration pattern of spaced horizontal lines, which is transmitted to the portable information device where it is repetitively compared to a stored calibration character. An acceptable error free transmission is signaled by a preselected number of matches. An audible signal indicates that the transmission rate is acceptable. The CRT pattern line spacing is adjusted until the audible signal is heard. The selectable pulse repetition rate may be automatically changed in increments by periodically changing the separation between lines on the CRT until an audible output signal is heard and providing for an operator to halt the automatic process. Alternatively, the pulse repetition rate may be manually changed in increments by an operator, until an audible output signal is heard.
86 Citations
11 Claims
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1. A method for synchronizing the data transfer rate for downloading data from a cathode ray tube (CRT) adapted for transmission of serial data bits as light pulses appearing as spaced lines on the CRT at a selectable pulse repetition rate to a portable information device having a photosensor responsive to said light pulses with means adapted to receive and store binary coded data corresponding to said light pulses at least one fixed pulse reception rate comprising:
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(a) providing calibration output signal means in said portable information device, (b) storing a calibration character comprising a block of binary coded data in said portable information device, (c) transmitting a block of serial data bits corresponding to said calibration character in the form of light pulses appearing as spaced lines on the CRT, (d) receiving said block of serial data bits via said photosensor on said portable information device, (e) comparing said received serial data bits with said stored calibration character, (f) activating said calibration output signal means after receiving at least one match of the received data bits with the stored calibration character, and (g) selecting a new pulse repetition rate by changing the line spacing of said spaced lines corresponding to said calibration character on the CRT and repeating steps (c) through (e) in the absence of a signal from said calibration output signal means, until said new repetition rate of the CRT data transmission may be received at the fixed pulse reception rate of the portable information device. - View Dependent Claims (2, 3, 4)
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5. Apparatus for synchronizing the data transfer rate for downloading data, comprising:
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a cathode ray tube (CRT) with means adapted to transmit serial data bits as light pulses appearing as spaced lines on the CRT at a selectable pulse repetition rate, a portable information device having a photosensor responsive to said light pulses with means adapted to receive and store binary coded data corresponding to said light pulses at least one fixed pulse reception rate, calibration output signal means in said personal information device, means for storing a calibration character comprising a block of binary coded data in said personal information device, means for transmitting a block serial data bits corresponding to said calibration character in the form of light pulses appearing as spaced lines on the CRT, means in said person information device for receiving said block of serial data bits, means for comparing said received serial data bits with said stored calibration character, means for activating said calibration output signal means after receiving at least one match of the received data bits with the stored calibration character, and means for selecting a new pulse repetition rate by changing the line spacing of said spaced lines corresponding to said calibration character on the CRT in the absence of a signal from said calibration output signal means, until said new pulse repetition rate of the CRT data transmission may be received at the fixed pulse reception rate of the portable information device. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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Specification