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Tape bias is the term for two techniques, AC bias and DC bias, that improve the fidelity of analogue tape recorders. DC bias is the addition of direct current to the audio signal that is being recorded. AC bias is the addition of an inaudible high-frequency signal (generally from 40 to 150 kHz) to the audio signal. Most contemporary tape ...
By 1976, ferricobalt formulations took over the video tape market, [60] and eventually they became the dominant high-performance tape for audio cassette. [51] Chromium dioxide disappeared from the Japanese domestic market, [51] although chrome remained the tape of choice for high fidelity cassette duplication among the music labels. In consumer ...
The Compact Cassette, also commonly called a cassette tape, [2] audio cassette, or simply tape or cassette, is an analog magnetic tape recording format for audio recording and playback. Invented by Lou Ottens and his team at the Dutch company Philips , the Compact Cassette was released in August 1963.
In 1989 JVC increased the run time to 30 minutes by using thinner tape. [3] Later, JVC offered 45-minute and 60-minute cassettes. For comparison, 120-minute 8-mm cassettes became available in the late 1985 and quickly became the norm. Later, 150-minute and 180-minute 8-mm cassettes were offered as well.
The frequency of the bias signal in consumer cassette decks is usually fixed at between 80 and 100 kHz. The quality of the bias signal is critical because noise, hum and direct current in the bias severely degrade audio fidelity. [4] The level of the bias signal defines the slope and shape of the resulting magnetization curve. [5]
Some analog tape manufacturers specify frequency responses up to 20 kHz, but these measurements may have been made at lower signal levels. [16] Compact Cassettes may have a response extending up to 15 kHz at full (0 dB) recording level. [17] At lower levels (−10 dB), cassettes are typically limited to 20 kHz due to self-erasure of the tape media.
typically 15–25 minutes per side (30 minutes per side for classical & spoken word), although 45 minutes is possible with tight groove spacing and no spacing between tracks. Audio cassette: Analog usually 30 (C-60) or 45 (C-90) minutes per side, 60 (C-120) minutes per side have also been sold although the tape is more prone to stretching or ...
Additionally, dirt on the tape of record head that lifted the tape away from the record head pushed it closer to the bias head, re-introducing the self-erasure problem. For proper results, cross-field recording needed high quality tapes, to ensure the oxide layer was thick enough to allow the bias signal to imprint on the deeper levels of the ...
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