Card-sized portable audio player using high quality audio coding technology Twin VQ

Tetsuya Takahashi, Takashi Morita, Toshiaki Shimoda, Takao Kaneko, Takehiro Moriya

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This paper presents a new implementation of the solid state audio player equipped with Twin VQ decoder. Twin VQ is an advanced high quality coding technology, and its basic algorithm is utilized in MPEG-4/Audio standardized by ISO (International Standardization Organization). Using Twin VQ coding, 44.1 kHz sampled audio data can be compressed at a very low bitrate of 40 kbit/s/ch with better sound quality than conventional coding methods as MPEG-1/Audio layer-3. Another feature of the player is that it is extremely compact, business-card-sized, 10 mm thick, including battery as a result of the efficient design. Decoding algorithms are optimized and implemented into 16 bit fixed-point DSP, and a very thin rechargeable lithium polymer battery is contained integral with the player. As a result, the new player has very practical performance with low power consumption, and 6 hours of 44 kHz stereo audio can be continuously played when the battery is fully charged.

Original languageEnglish
Pages (from-to)907-913
Number of pages7
JournalIEEE Transactions on Consumer Electronics
Volume46
Issue number3
DOIs
Publication statusPublished - 2000 Aug
Externally publishedYes

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Standardization
Decoding
Electric power utilization
Acoustic waves
Industry
Lithium-ion batteries

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications

Cite this

Card-sized portable audio player using high quality audio coding technology Twin VQ. / Takahashi, Tetsuya; Morita, Takashi; Shimoda, Toshiaki; Kaneko, Takao; Moriya, Takehiro.

In: IEEE Transactions on Consumer Electronics, Vol. 46, No. 3, 08.2000, p. 907-913.

Research output: Contribution to journalArticle

Takahashi, Tetsuya ; Morita, Takashi ; Shimoda, Toshiaki ; Kaneko, Takao ; Moriya, Takehiro. / Card-sized portable audio player using high quality audio coding technology Twin VQ. In: IEEE Transactions on Consumer Electronics. 2000 ; Vol. 46, No. 3. pp. 907-913.
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