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US5572555A
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Serial code format optimized for remote control applications over noisy communications channel
Assignee: Texas Instruments Inc
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Filing: 1994-06-15
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Granted: 1996-11-05
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Expires: 2014-06-15
Abstract
Abstract A transmitted data stream in a remote control system is a serial data stream having a synchronization sequence and a data sequence. The data sequence is encoded into a symbol comprised of a series of data bits wherein a 110 may represent a logic 1 and a 011 may represent a logic 0. A self adaptive filter adjusts its gain and offset to determine the duration of one bit. Providing a serial code format wherein the synchronization sequence has a smiller duty cycle as the duty cycle of a symbol aids the self adaptive filter to set its threshold switching level accurately and quickly, thus aiding the receiver to decode the transmitted data stream.
Inventors
- 👤 Eric G. Soenen
- 👤 Gregory B. Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:02
CPC Classifications
G; G07; G07C; G07C9/00; G07C9/00174; G07C9/00182; H; H04; H04L; H04L1/00; H04L1/24; H04L1/245; H04L1/246; H04L25/00; H04L25/02; H04L25/06; H04L25/069; H04L25/38; H04L25/40; H04L25/49; H04L25/4906; H04L25/4908; H04L7/00; H04L7/04; H04L7/041; H04L7/044; G07C2009/00753; G07C2009/00769; G07C2009/00793; G07C2209/00; G07C2209/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
149 words
A method of decoding a data transmission in a remote control access system of a serial data stream comprising the steps of: transmitting the serial data stream having a synchronization sequence and a data sequence, the synchronization sequence comprised of a plurality of high pulses and low pulses of about equal time length, the data sequence comprised of a plurality of high data pulses of time length L1 and low data pulses of time length L0, encoded into data symbols by three data pulses having a total time length L where L=L1+L0; and decoding the serial data stream by: recognizing said synchronization sequence when eight pair of consecutive high/low pulses are received for which 3/8 L≦L1≦5/8 L; assigning a unit value UL to the time length of one high/low synchronization pulse of said synchronization sequence; and recognizing a data symbol of said data sequence according to 11/8 UL≦L≦13/8 UL.
Claim 2
Independent Claim
149 words
A method of decoding a data transmission in a remote control access system of a serial data stream comprising the steps of: transmitting the serial data stream having a synchronization sequence and a data sequence, the synchronization sequence comprised of a plurality of high pulses and low pulses of about equal time length, the data sequence comprised of a plurality of high data pulses of time length L1 and low data pulses of time length L0, encoded into data symbols by three data pulses having a total time length L where L=L1+L0; and decoding the serial data stream by: recognizing said synchronization sequence when eight pair of consecutive high/low pulses are received for which 3/8 L≦L1≦5/8 L; assigning a unit value UL to the time length of one high/low synchronization pulse of said synchronization sequence; and recognizing a data symbol of said data sequence according to 11/8 UL≦L≦13/8 UL.
Claim 3
Dependent Claim
45 words
The method of claim 1 further comprising the step of: recognizing a data symbol of said data sequence having a logical "1" according to 7/8 UL≦L1≦9/8 UL; and recognizing a data symbol of said data sequence having a logical "0" according to 3/8 UL≦L0≦5/8 UL.
Claim 4
Dependent Claim
44 words
The method of claim 1 further comprising the step of: recognizing a data symbol of said data sequence having a logical "1" according to 3/8 UL≦L1-L0≦5/8 UL; recognizing a data symbol of said data sequence having a logical "0" according to 3/8 UL≦L0-L1≦5/8 UL.
References Cited (Backward Citations)
US3903504A
Cited
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| 3.5 Years (Year 4) | 1999-11-05 | 2000-05-06 | 2000-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-05 | 2004-05-06 | 2004-11-05 | $3760.00 | Window Closed / Lapsed |
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