在这个示例中,adpcm_encode函数负责将PCM样本编码为ADPCM格式,而adpcm_decode函数则负责将ADPCM数据解码回PCM样本。ADPCMState结构体用于存储编码器和解码器的状态信息,如预测器、步长索引和上一个样本值等。
15-SlowADPCMDecode Finding15independentstreamisdifficult8-trackor4-trackrecordingscouldexploit15-Slowor16-SlowMajorityofthedataisoneinputstream15-Slowresultsin1/15efficiencyforthespatialimplementationAttemptedtoremovethe15-Slowbehaviour ResidualAccumulatorArchitecture Possibletoremovethecycleconstraintsiftheclamping...
15-SlowADPCMDecode Finding15independentstreamisdifficult8-trackor4-trackrecordingscouldexploit15-Slowor16-SlowMajorityofthedataisoneinputstream15-Slowresultsin1/15efficiencyforthespatialimplementationAttemptedtoremovethe15-Slowbehaviour 9 ResidualAccumulatorArchitecture Possibletoremovethecycleconstraintsiftheclamping...
ADPCMDecode ScottJ.Weber ReconfigurableComputing ADPCM AdaptiveDifferentialPulseCodeModulation 4:1Compression Quantizedifferencebetweenthespeechsignalandapredictionthathasbeenmadeofthespeechsignal Decodebyaddingthequantizeddifferencesignaltothepredictedsignaltoreconstructthespeechsignal ...
8384/* end of tables */8586typedefstructADPCMDecodeContext{87ADPCMChannelStatus status[14];88intvqa_version;/**< VQA version. Used for ADPCM_IMA_WS */89inthas_status;90} ADPCMDecodeContext;9192staticav_coldintadpcm_decode_init(AVCodecContext * avctx)93{94ADPCMDecodeContext *c = avctx->...
npm install ima-adpcm-decoder yarn add ima-adpcm-decoder Usage import{decodeImaAdpcm}from'ima-adpcm-decoder'; constplayAdpcm=async()=>{ constctx=newAudioContext(); constresponse=awaitfetch('./test.wav'); constbuffer=awaitresponse.arrayBuffer(); ...
PCM, Pulse Code Modulation, 脉冲编码调制 PCM 是声音模拟信号数字化的一种基础技术, 就是把时间连续取值连续的模拟信号变换成离散取值的数字信号, 熟悉ADC(模拟数字转换)的应该很好理解, 过程就是采样, 量化和编码. 1. 采样 用固定的频率, 对模拟信号提取样本值, 人耳能够感觉到的最高频率为20kHz, 根据奈奎斯...
上述示例代码中,ADPCMEncoder和ADPCMDecoder分别表示ADPCM编码器和解码器。ADPCMEncoder的encode方法用于进行ADPCM压缩,ADPCMDecoder的decode方法用于进行ADPCM解压缩。 关于计算相关的数学公式 在ADPCM算法中,涉及到了一些计算相关的数学公式。下面是其中两个重要的数学公式: ...
def adpcm_decode(encoded_data, step_size=16): # 初始化预测器状态和量化表 predictor = 0 index = 0 quantizer_step_size = np.power(2, step_size) quantizer_table = np.array([0, 1, 2, 3, 4, 5, 6, 7]) * (quantizer_step_size // 8) ...
PURPOSE: To decode a source sound faithfully by preventing an analog output from having large amplitude variation even when the value obtained by accumulating difference values exceeds the output range of a DA converter 8 when ADPCM codes are decoded. CONSTITUTION: The ADPCM code data in an L ...