Data processing: speech signal processing – linguistics – language – Speech signal processing – Application
Patent
1996-06-13
1998-11-17
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
Application
704210, 704215, 704233, 704246, G10L 300, G10L 302, G10L 506, G10L 900
Patent
active
058391100
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a transmitting and receiving apparatus for speech signals employing a radio telephone network, such as a car telephone set or a portable telephone set. More particularly, it relates to a transmitting and receiving apparatus conveniently applied to a telephone set for a digital radio telephone network configured for transmission and reception of digital data.
BACKGROUND ART
As a telephone for communication during movement utilizing a radio telephone network, a variety of car telephone or portable telephone sets have been developed. The car telephone and portable telephone sets are managed at the outset by a communication system utilizing analog communication. This communication system, which scrambles signals by various signal processing techniques such as frequency interchanging, suffers from problems in connection with confidentiality in communication since radio signals may be easily intercepted by simple signal processing. Thus the producers have developed a telephone set by digital radio network which effects communication by radio transmission of digital data.
On the other hand, a variety of so-called automatically answering telephone sets, having a recording/reproducing unit built therein for recording/reproducing the contents of conversations, have been developed. With the automatic answering telephone set, a tape recorder is built in the telephone set. With the tape recorder enclosed in the telephone unit, the function of the unit is improved, since the message from the remote party is recorded in the absence of the telephone set owner or the message desired to be imparted may be pre-recorded and imparted to the remote party.
There has also been developed a telephone set of the so-called solid state recording system in which speech parameters compressed from the speech signals are directly recorded or in which the speech parameters are variable-length encoded and recorded on a small-sized semiconductor memory.
With the above-described semiconductor memory, having a limited storage capacity, it is only possible to records a conversation continuing for only a pre-set time duration even using speech parameters compressed from the speech signals.
However, the present state of the art is such that, when recording the speech signals from the remote responding party or the transmitting party, the silent period, during which none of the parties is talking, is also recorded. For effective recording of the conversation with the limited storage capacity, it becomes necessary to make more effective recording during bidirectional or unidirectional communication such as by lowering the recording rate during such silent period.
In particular, during the double talk, that is the state in which, on reproducing the signals transmitted from an up-link and a down-link, signals from the up-link and those from the down-link co-exist in superposition on reproduction, recording needs to be made in both directions, so that recording needs to be performed in a more effective manner.
In view of the foregoing, it is an object of the present invention to provide an apparatus for transmission and reception of speech signals whereby the pre-set recording capacity may be efficiently utilized in the bidirectional/unidirectional communication without increasing the circuit construction.
DISCLOSURE OF THE INVENTION
According to the present invention, there is provided a speech signal transmitting/receiving apparatus having compressing and encoding means, such as a speech encoder, for compressing and encoding an input speech signal, transmitting means for transmission processing an output signal of the compressing and encoding means, receiving means for reception processing a received signal, expansion decoding means for expanding and decoding an output signal of the receiving means for outputting a speech signal, storage means for storing a signal from the compressing encoding means and/or a signal to the expanding and decoding means, and control means for controlling writing of the s
REFERENCES:
patent: 5111501 (1992-05-01), Shimanuki
patent: 5157728 (1992-10-01), Schorman et al.
patent: 5553190 (1996-09-01), Ohya
Maeda Yuji
Nishiguchi Masayuki
Odaka Kentaro
Hudspeth David R.
Maioli Jay H.
Sax Robert Louis
Sony Corporation
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