 Flextensional metal-ceramic composite transducer |
| OF THE INVENTION Referring to FIG. 1, a first embodiment of the transducer of the invention ... |
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| Electroacoustic transducers comprising vibrating panels |
| OF THE INVENTION Referring to FIGS. 1 and 2, the first embodiment of electro-acoustic transducer ... |
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| Video data transmitting system |
| It is an object of the present invention to solve the problems mentioned above. Another object of ... |
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| Electroacoustic network |
| I claim: 1. A co-axial pair of high and low frequency electroacoustic drivers wherein the high ... |
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| Muffler mechanism for a piano |
| It is the object of the present invention to provide a muffler mechanism of a simple construction ... |
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| Opto-electronic sensing method and device for an acoustic piano |
| It is, therefore, a principal object of the present invention to provide for a displacement or ... |
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| Interface for coupling audio and video equipment to computer |
| OF THE INVENTION FIG. 3 illustrates the basic concept of the present invention. A personal ... |
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| Electromagnetic shutter |
| I claim: 1. Strip module extending in a longitudinal direction, in combination with a plurality of ... |
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| Speech processing apparatus and methods |
| It is an object of the present invention to provide improved speech processing apparatus and ... |
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| Reverberation tone generating apparatus |
| Accordingly, it is an object of this invention to provide a novel reverberation tone generating ... |
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Control unit for controlling modem used in receiver
| Details |
Inventors: Uchiyama, Hiroki;
Assignee: Ricoh Company, Ltd. (Tokyo, JP)
Primary Examiner: Chin; Stephen
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt
A control unit for controlling a modem used in a receiver demodulates a received signal by use of an adaptive equalizer, and a recovery circuit includes a timing recovery function and a carrier recovery function. States regarding operations in the adaptive equalizer and the recovery circuit are updated based on the received signal. The modem includes a determination unit for determining whether or not the modem is operating unusually based on a signal processed in the modem, a buffer for storing state data at a predetermined timing when the determination unit determines that the modem is not operating unusually, and a controller for controlling the adaptive equalizer and the recovery circuit so that the adaptive equalizer and the recovery circuit operate based on the state data which has been stored in the buffer when the determination unit determines that the modem is operating unusually. |
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DETAILED DESCRIPTION Accordingly, a general object of the present invention is to provide a novel and useful control unit for a modem in which the disadvantages of the aforementioned prior art are eliminated.
A more specific object of the present invention is to provide a modem in which, even if the disturbances are added to communication paths, coefficients in an adaptive equalizer can be prevented from being diverged, so that malfunctions in which the modem hangs up or the like can be prevented from occurring.
Another object of the present invention is to provide a control unit for a modem in which a received signal can return to a steady state for a short time after the disturbances are added to the communication paths.
The above objects of the present invention are achieved by a control unit for a modem used in a receiver for demodulating a received signal by use of adaptive equalizer means for equalizing the received signal, timing recovery means for generating a synchronous signal based on the received signal, and carrier recovery means for presuming a phase of a carrier in the received signal, states regarding operations in the adaptive equalizer means, the timing recovery means, and the carrier recovery means being updated based on the received signal, the control unit comprising: determination means for determining whether or not the modem is operating unusually based on a signal processed in the modem; storage means, coupled to the determination means, for storing state data at a predetermined timing when the determination means determines that the modem is not operating unusually, the state data representing states regarding operations in the modem; and control means, coupled to the determination means and the storage means, for controlling at least one of the adaptive equalizer means, the timing recovery means and the carrier recovery means so that the at least one of the adaptive equalizer means, the timing recovery means and the carrier recovery means operate based on the state data which has been stored in the storage means when the determination means determines that the modem is operating unusually
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Audio Signal Processing 
