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Embedded MP3 Encoder Card


Bahr Management, Inc.

The MP3 encoder has the following specifications:

Input characteristics

  • Number of channels is 2 but can be multiplexed to 1
  • encoder channel (2 with “joint stereo” only)
  • Full-scale input voltage 3.2Vpp (gain at –3dB)
  • Input resistance 110k
  • Gain -3dB…..+19.5dB (steps of 1.5dB)

    Encoder characteristics

  • Format MPEG 1/2 Layer 3
  • Sampling Frequencies
  • MPEG1 Layer3: 44.1kHz; 48kHz; 32kHz MPEG2 Layer3: 22.05kHz; 24kHz; 16kHz
  • Quality settings 0 (lowest bit rate/quality)…..7(highest bit rate/quality)
  • Average bit rates examples
  • Fs = 44.1kHz, mono: 65kbit/s (quality settings = 0)
  • Fs = 44.1kHz, mono: 80kbit/s (quality settings = 3)
  • Fs = 44.1kHz, mono: 140kbit/s (quality settings = 7)
  • Fs = 22.05kHz, mono: 35kbit/s (quality settings = 0)
  • Fs = 22.05kHz, mono: 45kbit/s (quality settings = 3)
  • Fs = 22.05kHz, mono: 90kbit/s (quality settings = 7)

    Serial interface characteristics

  • RS232-voltage +/- 6V
  • TTL-voltage 0V; 3.2V
  • Speed 115200 baud
  • Format 1 start bit, 1 stop bits, no handshake, no parity

    Power supply

  • Voltage 4Vmin….10Vmax
  • Power consumption Standby (no encoding): 50mA / 5V
  • Encoding: 100mA / 5V

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