There is a problem with the sound quality in the node environment

[TDL-sys]

`
async function getBase64() {
const result = await axios.get(request.params.arrbu, { responseType: 'arraybuffer' });
return result.data
}
let arrayBuffer = await getBase64()
console.log(arrayBuffer)
var samples = new Uint16Array(arrayBuffer);
encodeMono(1, 32000, samples);

function encodeMono(channelNum, sampleRate, samples) {

    var buffer = [];
    var mp3enc = new lamejs.Mp3Encoder(channelNum, sampleRate, 192);
    var remaining = samples.length;
    var maxSamples = 1152;
    for (var i = 0; remaining >= maxSamples; i += maxSamples) {
        var mono = samples.subarray(i, i + maxSamples);
        var mp3buf = mp3enc.encodeBuffer(mono);
        if (mp3buf.length > 0) {
            buffer.push(new Uint8Array(mp3buf));
        }
        remaining -= maxSamples;
    }
    var flushData = mp3enc.flush();
    if (flushData.length > 0) {
        buffer.push(new Uint8Array(flushData));
    }
    const buf3 = Buffer.concat(buffer);
    
}

`

The sound quality in node environment is not good. How can I improve it