The PCM Encoder converts an analog input signal to a digitally-coded output signal (pulse to PAM, PWM, and PPM), since the PCM output is in binary code.

In PCM, an analog input signal is sampled and an 8-bit code is generated representing the input signal amplitude at each sample point. A bar graph indicator for the test bus shows the logic states of the 8-bit A/D converter output. Both parallel and serial PCM outputs are provided for experimental work.

Using the PCM Encoder, students become familiar with the basics of A/D conversion and PCM signal generation.  Other important concepts, such as quantization error and volume compression are studied as well.

Specifications

Power Requirements: Connection to the Enclosure / Supply Regulator, Model 9420 (not included)

Audio Input
Voltage: 2 V p-p
Impedance: 600 Ω
Frequency Range: 300 Hz to 5 kHz

Clock Input
Maximal Frequency: 40 kHz
Outputs: Serial-bit parallel end of conversion (A/D converter)
Output Voltage: TTL

Compression Modes

• 4 Bell μ-type laws
• 3 CCIT A-type laws
• Direct (no compression)

Fault-Insertion Switches: 8
Test Bus: 1

Physical Characteristics
Dimensions (H x W x D) 83 x 142 x 212 mm (3.3 x 5.6 x 8.3 in)
Net Weight 0.9 kg (2.0 lb)