具有双频的 Pygame 声音输出？

如何解决具有双频的 Pygame 声音输出？

我的声纳需要测试扫描发生器。 我使用带有 HiFiDac 的 RaspBerry Pi。 帮我看看为什么输出频率是设置的两倍。 我使用了图书馆的声音设备。输出信号正确。 也许 pygame 不知道如何使用如此高的采样率。 :(

#################################
# Sweep Generator
#################################
import pygame
import numpy as np
from scipy.signal import chirp
sweep = 0
Run = False
Brush = True
samplerate = 192000.0
# samplerate = 41100.0
# samplerate = 96000.0
blocksize = 1024 * 4
# amplitude = 0.525
g_amplitude = 18550  # 18550 - 3.3V P2P
chirp_x = 0
chirp_y = []
start_idx = 0
sweeps = {
    0: [18000,34000,0.004],1: [7000,17000,2: [12000,24000,3: [4000,10000,4: [48000,78000,}
#sweep
def sweep_gen():
    global chirp_x,chirp_y,g_amplitude
    T = sweeps[sweep][2]
    chirp_x = np.arange(0,int(T * samplerate)) / samplerate
    chirp_y = chirp(
        chirp_x,f0=sweeps[sweep][0],f1=sweeps[sweep][1],t1=T,method="linear"
    )
    chirp_y = chirp_y * g_amplitude
    chirp_y = chirp_y.astype(np.int16)
    # return chirp_y
#sin
def sin_gen(frequency):
    # sample_rate = pygame.mixer.get_init()[0]
    sample_rate = int(samplerate)
    period = int(round(sample_rate / frequency))
    amplitude = 2 ** (abs(pygame.mixer.get_init()[1]) - 1) - 1

    def frame_value(i):
        return amplitude * np.sin(2.0 * np.pi * frequency * i / sample_rate)
        # return g_amplitude * np.sin(2.0 * np.pi * frequency * i / sample_rate)

    return np.array([frame_value(x) for x in range(0,period)]).astype(np.int16)
#pygame init
pygame.mixer.pre_init(frequency=int(samplerate),size=-16,channels=2,buffer=blocksize)
pygame.init()
#start output
sweep_gen()
buffer = sin_gen(220)
sound = pygame.mixer.sound(buffer=buffer)
# sound = pygame.mixer.sound(buffer=chirp_y)
while True:
    sound.play(-1)
##########################################
# end 
########################################## 

感谢您的帮助。 安德鲁