Pack K Bits: Difference between revisions
No edit summary |
|||
| (One intermediate revision by one other user not shown) | |||
| Line 1: | Line 1: | ||
[[Category:Block Docs]] | [[Category:Block Docs]] | ||
[[Category:Pages with no Example Flowgraph]] | |||
Converts a stream of bytes with 1 bit in the LSB to a byte with K relevant bits. It's the opposite of [[Unpack K Bits]] | Converts a stream of bytes with 1 bit in the LSB to a byte with K relevant bits. It's the opposite of [[Unpack K Bits]] | ||
| Line 27: | Line 28: | ||
; C++ files | ; C++ files | ||
: [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/lib/pack_k_bits_bb_impl.cc] | : [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/lib/pack_k_bits_bb_impl.cc Byte implementation] | ||
: [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/lib/pack_k_bits.cc] | : [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/lib/pack_k_bits.cc Base class] | ||
; Header files | ; Header files | ||
| Line 34: | Line 35: | ||
; Public header files | ; Public header files | ||
: [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/include/gnuradio/blocks/pack_k_bits_bb.h] | : [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/include/gnuradio/blocks/pack_k_bits_bb.h Byte implementation] | ||
: [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/include/gnuradio/blocks/pack_k_bits.h] | : [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/include/gnuradio/blocks/pack_k_bits.h Base class] | ||
; Block definition | ; Block definition | ||
: [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/grc/blocks_pack_k_bits_bb.block.yml] | : [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/grc/blocks_pack_k_bits_bb.block.yml] | ||
Latest revision as of 19:16, 1 April 2025
Converts a stream of bytes with 1 bit in the LSB to a byte with K relevant bits. It's the opposite of Unpack K Bits
In other words, it packs K unpacked bits (one bit per byte, since the byte is the smallest item size in GNU Radio) into a single packed byte containing K bits and 8 - K zeros.
This block takes in K bytes at a time, and uses the least significant bit to form a new byte.
Example:
K = 4
in = [0, 1, 0, 1, 0x81, 0x00, 0x00, 0x00]
out = [0x05, 0x08]
The first four bytes coming in get combined to form binary 0101 which is 0x05
The next four bytes get combined to form binary 1000 which is 0x08. Note that even though one of the input bytes was 0x81, all that mattered was the least significant bit, which was a 1, the rest of the bits in that byte got discarded.
Parameters
- K
- Number of bits to be packed.
Example Flowgraph
Source Files
- C++ files
- Byte implementation
- Base class
- Header files
- [1]
- Public header files
- Byte implementation
- Base class
- Block definition
- [2]