Digital audio recorder and digital audio recording and reproduci

Details Digital audio recorder and digital audio recording and reproduci Digital audio recorder and digital audio recording and reproduci

1995-09-29

1998-08-04

Hindi, Nabil

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369124, G11B 700

Patent

active

057904944

ABSTRACT:
A digital audio recorder and system efficiently increases a sampling frequency and a number of bits of a digital audio recording. The digital audio system has a frequency analyzer receives a first digital waveform data having a sampling frequency fs1 and N1 number of bits and determining a sampling frequency fs2 in accordance with a highest frequency component of the first digital waveform data. A delay device delays the first digital waveform data a time period equal to the time required for the frequency analyzer to determine the highest frequency component and then sends the first digitial waveform data to a frequency converter. The frequency converter converts the first digital waveform data to a second digital waveform data having the sampling frequency fs2 and a number of bits N2. A bit number converter converts the second digital waveform data to a third digital waveform data having a sampling frequency fs2 and a number of bits N3 determined in response to variation in the sampling frequency fs2 such that the product of fs2 and N3 is constant. A memory device stores the third digital waveform data.

REFERENCES:
patent: 4990848 (1991-02-01), So
patent: 5239598 (1993-08-01), Wight et al.

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