Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Patent
1994-04-20
1995-08-01
MacDonald, Allen R.
Electrical audio signal processing systems and devices
Hearing aids, electrical
Specified casing or housing
395 235, 395 239, 381 29, G10L 302
Patent
active
054386438
ABSTRACT:
Apparatus for recording an information signal as bit-compressed digital data. The apparatus comprises a bit compressor and a recording system. The bit compressor receives the information signal as digital data. The digital data include bits, and the bits include redundant bits. The bit compressor compresses the digital data by removing only the redundant bits from the digital data to generate the bit-compressed digital data at a variable bit rate. The redundant bits are bits that result in a quantizing noise level lower than an allowed noise level at which the quantizing noise is imperceptible to a human auditory sense. The allowable noise level is determined by a masking threshold and a minimum audibility limit. The recording system receives the bit-compressed digital data from the bit compressor and records the bit-compressed data on a recording medium.
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Akagiri Kenzo
Oikawa Yoshiaki
Tsutsui Kyoya
Hafiz Tariq
Hardcastle Ian
MacDonald Allen R.
Sony Corporation
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