Playing stereo_44100.wav too slow and without RDS

[andimik]

I am using a RPI3B and could build PiFmAdv without any problem.

But when I want to test it with the stereo_44100.wav I hear a male voice but this is very very slow. I can even not understand what the voice is saying.

$ sudo ./pi_fm_adv -a stereo_44100.wav -f 87.9
Carrier: 87.90 Mhz, VCO: 966.9 MHz, Multiplier: 50.359375, Divider: 11
Allocating physical memory: size = 4354048, mem_ref = 8, bus_addr = fe40e000, virt_addr = 0x767ca000
Master PLLA Locked
PPM correction is 0.0000, divider is 2120.3947 (2120 + 1616*2^-12).
Using audio file: stereo_44100.wav
Input: 44100 Hz, upsampling factor: 5.17
2 channels, generating stereo multiplex.
Created preemphasis with cutoff at 3185 Hz
Created low-pass FIR filter for audio channels, with cutoff at 15000 Hz
RDS Options:
RDS: 1, PI: 1234, PS: "PiFmAdv", PTY: 15
RT: "PiFmAdv: Advanced FM transmitter for the Raspberry Pi"
Starting to transmit on 87.9 MHz.
^CTerminating: cleanly deactivated the DMA engine and killed the carrier.

I've added gpu_freq=250 to /boot/config.txt

$ cat /proc/cpuinfo
processor   : 0
model name  : ARMv7 Processor rev 4 (v7l)
BogoMIPS    : 38.40
Features    : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32 
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part    : 0xd03
CPU revision    : 4

processor   : 1
model name  : ARMv7 Processor rev 4 (v7l)
BogoMIPS    : 38.40
Features    : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32 
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part    : 0xd03
CPU revision    : 4

processor   : 2
model name  : ARMv7 Processor rev 4 (v7l)
BogoMIPS    : 38.40
Features    : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32 
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part    : 0xd03
CPU revision    : 4

processor   : 3
model name  : ARMv7 Processor rev 4 (v7l)
BogoMIPS    : 38.40
Features    : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32 
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part    : 0xd03
CPU revision    : 4

Hardware    : BCM2835
Revision    : 2a02082
Serial      : 00000000b5d9d67a
Model       : Raspberry Pi 3 Model B Rev 1.2

This is the audio file

gqrx_20201223_200613_87900000.zip

The Pilot is NOT at 19 kHz and RDS is not on 57 kHz.

[evertverduin]

There is no support, at least, no one of the devs responds. Edited 02-01-2021:

My solution was to erase raspberry os! install Raspbian Jesse lite, and install gpu_freq=250 in config.txt

DON'T USE MODERN RASPBERRY PI-OS!

Symptoms are: Baseband signal is at half of it's sampling rate. Audio to slow, pilot on 9.5 khz and rds at rds/2.

Solution -> install Raspbian Jesse. with gpu_freq=250 in config.txt

And IT Will work!

BR

Evert

[andimik]

I solved it by using https://github.com/mundeeplamport/PiFM instead. This fork allows option -p (which does not work in PiFmAdv, only in PiFmRds and PiFM)

No need to reinstall OS.