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【多选题】
下列关于智能降噪技术的说法，正确的是A.
采用频谱法降噪技术的数字助听器能够分析环境信号的频谱
B.
采用频谱法降噪技术的数字助听器能够对频谱的变化进行跟踪，以确定噪声的频段和语音的频段，对噪声进行衰减，对语音放大
C.
不同品牌助听器采用不同的频谱跟踪分析算法
D.
频谱提升系统并不直接区分言语和噪声
E.
声音调制类型的降噪系统在非常嘈杂的环境中更有效，而频谱提升系统在安静或中等噪声环境中更有效
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