urn;

                        let inputData = e.inputBuffer.getChannelData(0); // Float32Array

                        // 先降采样到16kHz
                        let downsampledBuffer = this.downsampleBuffer(inputData, this.audioContext.sampleRate, this.outputSampleRate);

                        // 转16bit PCM
                        let int16Buffer = this.floatTo16BitPCM(downsampledBuffer);

                        // 发送二进制数据
                        if (this.websocket && this.websocke