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Class Information
Number: 341/54
Name: Coded data generation or conversion > Digital code to digital code converters > To or from particular bit symbol > Bit represented by discrete frequency
Description: Subject matter where different specific frequencies are used to represent the signal states of the digital signals.










Patents under this class:

Patent Number Title Of Patent Date Issued
8369972 Methods and apparatus to perform audio watermarking and watermark detection and extraction Feb. 5, 2013
8295416 Noise-canceling frequency-to-digital converters Oct. 23, 2012
8276038 Data storage systems Sep. 25, 2012
8237980 Serial interface device and image forming apparatus Aug. 7, 2012
8232902 Pulse modulation devices and methods Jul. 31, 2012
8138955 Pulse modulation devices and methods Mar. 20, 2012
8032362 Audio signal encoding/decoding method and apparatus Oct. 4, 2011
7656320 Difference coding adaptive context model using counting Feb. 2, 2010
7075434 Encoding and decoding method and system Jul. 11, 2006
6870492 Method of near-unity fractional sampling rate alteration for high fidelity digital audio Mar. 22, 2005
6583654 Clock synchronization device Jun. 24, 2003
6476735 Method of encoding bits using a plurality of frequencies Nov. 5, 2002
6404357 Digital/analogue communication system for increasing transfer efficiency of digital sample data Jun. 11, 2002
6204942 Demultiplexing with clocked optical receivers Mar. 20, 2001
6175316 Bin-to-bin differential encoding apparatus and method for a discrete multi-tone transmission system Jan. 16, 2001
6107945 Correlated sampled area detector Aug. 22, 2000
5754127 Information encoding method and apparatus, and information decoding method and apparatus May. 19, 1998
5548574 Apparatus for high-speed recording compressed digital audio data with two dimensional blocks and its compressing parameters Aug. 20, 1996
5454006 Method and apparatus for bandwidth limited binary signals Sep. 26, 1995
5119093 Apparatus for converting a signal of a first sample rate into a signal of a second sample rate Jun. 2, 1992
4990911 Sampling frequency converter Feb. 5, 1991
4816829 Method of and apparatus for converting digital data between data formats Mar. 28, 1989
4602131 Touch tone decoder Jul. 22, 1986
4503291 Repertory dialer with efficient data storage Mar. 5, 1985
4473820 Signal decoder for converting a co-directional 64 kbit/s interface signal into a binary information signal, a 64 KHZ clock and an 8 KHZ clock Sep. 25, 1984
4425666 Data encoding and decoding communication system for three frequency FSK modulation and method therefor Jan. 10, 1984
4042787 Output processing and output coupling circuit for a digital tone receiver Aug. 16, 1977
4028501 Method and apparatus for translating multiple frequency signalling Jun. 7, 1977
4025865 Frequency-signalling circuit for a telephone May. 24, 1977
4000371 Facsimile transmission method and system Dec. 28, 1976
3990071 Data transmission system using frequency permutation codes Nov. 2, 1976
3976996 Conversion of FSK to NRZ coding Aug. 24, 1976











 
 
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