nx_ns.nx

buildroot/runtime/_hdl_build/nx_ns.nx

9368 B159 linesdepth 2pulls 2 transitivereach 0 importersview sourcekind tool

docs dependencies structs consts functions

about

nx_ns.nx -- R4b: sovereign single-channel Noise Suppressor (the other reserved nx_ns slot). Integer 3-band Wiener-gain suppressor (NO-FLOAT). A moving-average filterbank splits the signal into low / mid / high subbands (perfect reconstruction: low+mid+high == input); a noise-only lead-in estimates per-band noise power; each frame attenuates a band by a Wiener gain g = max(floor, (band_power - noise_power)/band_power). Bands dominated by noise (e.g. broadband hiss in the high band where speech has little energy) collapse toward the floor; speech-bearing bands pass -> noise down, speech preserved -> SNR up. MEASURED metric = SNR improvement: distance of the OUTPUT to the clean reference vs distance of the NOISY INPUT to the clean reference. Negative control: gains forced to 1 (suppressor OFF) -> output == input -> no improvement (the gains are load-bearing). HONEST SCOPE: in-band noise under speech is NOT removed (single-channel limit -- same as the classic spectral-subtraction tradeoff); a perceptual/DNN suppressor + musical-noise control = deeper rung. main() is the SELF-VALIDATING GATE. Evidence -> knowledge/status/ns.log. license_tier: ORIGINAL

dependencies 1 imports · 0 importers

imports: nx_syscalls.nx

imported by: nobody (leaf or entry point)

call flow from main pre-order; caps 40 nodes / depth 6 declared; ↻ = already shown

structs

none

consts

18	const NS_MAGIC_6000: i64 = 6000
19	const NS_MAGIC_8000: i64 = 8000
20	const NS_MAGIC_1500: i64 = 1500
21	const NS_MAGIC_3000: i64 = 3000
22	const NS_MAGIC_99991: i64 = 99991
23	const NS_MAGIC_1103515245: i64 = 1103515245
24	const NS_MAGIC_12345: i64 = 12345
25	const NS_MAGIC_6001: i64 = 6001
27	const NS_LOG: *u8 = "knowledge/status/ns.log"
28	const QG: i64 = 12 // gain fixed-point (4096 = 1.0)
29	const GFLOOR: i64 = 256 // minimum gain ~0.0625 (residual-noise floor, avoids musical noise)
30	const FR: i64 = 256 // frame length

functions

32	func nw(fd: i64, s: *u8) -> i64 { var n: i64=0; while s[n]!=(0 as u8){n=n+1} sys_write(fd,s,n); return 0 } called by 1: main calls 1: sys_write
33	func nwn(fd: i64, v: i64) -> i64 { let bb: u8=sys_mmap(28); var m: i64=v; if m<0{m=0-m;sys_write(fd,"-" as u8,1)} let t: *u8=sys_mmap(28); var k: i64=0; if m==0{t[0]=48 as u8;k=1} while m>0{t[k]=(48+(m%10)) as u8;m=m/10;k=k+1} var i: i64=0; while i<k{bb[i]=t[k-1-i];i=i+1} sys_write(fd,bb,k); return 0 } called by 1: main calls 2: sys_mmap sys_write
36	func ma(x: i64, out: i64, N: i64, W: i64) -> i64 called by 1: ns_run
47	func powwin(a: i64, start: i64, n: i64) -> i64 { var s: i64=0; var i: i64=start; while i<start+n { s=s+a[i]a[i]; i=i+1 } return s } called by 1: main
48	func powdiff(a: i64, b: i64, start: i64, n: i64) -> i64 { var s: i64=0; var i: i64=start; while i<start+n { let d: i64=a[i]-b[i]; s=s+d*d; i=i+1 } return s } called by 1: main
49	func bandval(which: i64, L: i64, Lm: i64, xv: i64) -> i64 { if which==0 { return L } if which==1 { return Lm - L } return xv - Lm } called by 1: ns_run
52	func wiener(fp: i64, np: i64) -> i64 called by 1: ns_run
61	func ns_run(x: i64, y: i64, L: i64, Lm: i64, N: i64, P: i64, enable: i64) -> i64 called by 1: main calls 3: ma bandval wiener
87	func tri(i: i64) -> i64 { let ph: i64=i % 256; if ph>=128 { return NS_MAGIC_6000 - (ph-128)94 } return ph94 - NS_MAGIC_6000 } called by 1: main
89	func main() -> i64 calls 10: sys_mmap tri ns_run powwin powdiff nw+4