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为了测试我正在尝试使用 gnuradio 中的 python 块开发自己的 SineWave 生成​​器

块在这里

"""
Embedded Python Blocks:

Each time this file is saved, GRC will instantiate the first class it finds
to get ports and parameters of your block. The arguments to __init__  will
be the parameters. All of them are required to have default values!
"""

import numpy as np
from gnuradio import gr


class blk(gr.sync_block):  # other base classes are basic_block, decim_block, interp_block
    """Embedded Python Block example - a simple multiply const"""

    def __init__(self, sample_rate=192e3, frequency=1e3, amplitude=1):  # only default arguments here
        """arguments to this function show up as parameters in GRC"""
        gr.sync_block.__init__(
            self,
            name='SineWave Generator',   # will show up in GRC
            in_sig=[np.float32],
            #in_sig=None,
            out_sig=[np.float32]
        )
        # if an attribute with the same name as a parameter is found,
        # a callback is registered (properties work, too).
        self.sample_rate = sample_rate
        self.frequency = frequency
        self.amplitude = amplitude
        

    def work(self, input_items, output_items):
        """example: multiply with constant"""
        print "length of input =",  len(input_items[0])
        print "length of output =",  len(output_items[0])
        
        for i in range(0, len(output_items[0])): #8192
            output_items[0][i] = np.sin(2 * np.pi * self.frequency * (i / self.sample_rate)) * self.amplitude 
        
        
        
        return len(output_items[0])

并像这样在我的流程图中使用 https://imgur.com/28kE1Sj

这个块产生正弦波，但音频真的很不稳定，就像我不能足够快地产生正弦波或其他东西（sample_rate 应该不是问题，因为如果我用信号源替换我的块，相同的流程图可以正常工作）

我也在使用 Null 源（因为我还没有弄清楚如何创建一个没有任何源的 python 块（一旦我设置 in_sig=None 就没有音频从我的块中出来，所以我不确定信号源在没有任何源连接到其输入的情况下生成音频）

感谢您的回复和最诚挚的问候

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