Dolby Noise Reduction Unit (1973)
The Lafayette DNR-50 is a noise reduction unit employing the patented Dolby B type Noise Reduction System for encode and decode functions. It is designed for use with any high quality tape deck to provide superior recordings and playback, relatively free of tape hiss and noise.
The Dolby system operates by encoding the signal as it is fed to your tape recorder during recording. This encoding process consists of a special pre-emphasis technique which boosts low-level signals in the mid and high-frequency audio range, while maintaining the high-level signals at their existing levels.
During playback of an encoded signal, a complimentary action takes place, so that signals which were previously emphasized are now de-emphasized and returned to their original levels.
During this decoding process, tape noise in the treated range in substantially reduced without affecting the audio response of the program itself.
Input sensitivity: 100mV
Output level: 1.2V
Noise reduction system: dolby
S/N improvement: 10dB (dolby)
Frequency response: 20Hz to 20kHz
Signal to noise ratio: 65dB
Total harmonic distortion: 0.5%
Channel separation: 50dB
Dimensions: 9 x 7-3/8 x 3-1/8 inches
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