 Smoke and heat detector alarm |
| This invention relates generally to the field of alarm systems, and more particularly, is directed ... |
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| Door alarm system |
| OF THE INVENTION The door alarm system of the invention is for a door 1 (FIGS. 1 to 4) rotatably ... |
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| Armour-piercing high-explosive projectile with cartridge |
| I claim: 1. An armour-piercing high-explosive projectile comprising a body portion attached to a ... |
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| Contoured dental posts |
| Accordingly, it is an object of the present invention to provide an improved dental post. A further ... |
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| Process and apparatus for treating teeth |
| OF THE PREFERRED EMBODIMENT Referring now to the drawing, FIG. 1 shows a tooth 1 the volume of ... |
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| High performance acoustical cleaning apparatus for teeth |
| What is claimed is: 1. A dental hygiene device for cleaning teeth and interdental and gingival ... |
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| Dental prosthesis |
| Accordingly, it is an object of the present invention to provide a dental prosthesis having a ... |
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| Externally synchronized timebase |
| The invention consists in a multi-generator externally synchronized timebase, with majority ... |
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Radio receiver for locating the strongest signal carrying a selected program
| Details |
Inventors: Koyama, Kazuo;
Assignee: Clarion Co., Ltd. (Tokyo, JP)
Primary Examiner: Urban; Edward F.
Assistant Examiner: Faile; Andrew
Attorney, Agent or Firm: Koda and Androlia
A receiver has a random counter, which outputs a timer signal to a control circuit. A zero-cross point detection circuit generates a detection signal which is input to the control circuit. When the random counter outputs a timer signal and the zero-cross detection circuit detects a zero-cross point, a muting function is activated. Simultaneously, different frequencies are scanned for broadcasts containing the same program and having higher field strengths. If on re-checking zero-cross point detection, a zero-cross point is found or a predetermined interval has expired, then the muting function is deactivated. The frequency with the greater field strength is selected. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG.
1, a frequency modulation (FM) receiver 1 connected to an antenna la reproduces an audio frequency (AF) signal incorporated into a broadcast transmission signal.
A microprocessor-based controller 4 controls the tuning of FM receiver 1 and the volume of a demodulated AF signal.
The demodulated AF signal is volume controlled by an electronic volume controller 5.
The volume controlled AF signal is applied to an amplifier 6.
An amplified output from amplifier 6 is applied to a speaker (not shown).
The AF signal from FM receiver 1 also contains a RDS signal.
The RDS signal is band-pass filtered in a band-pass filter circuit 2 to select the portion of the AF signal containing the RDS content and to remove unwanted frequencies, such as audible frequencies containing program material.
An output of band-pass filter circuit 2 is applied to an RDS signal decoder/error correction circuit 3 which decodes and outputs the digital RDS data for application to controller 4.
Controller 4 controls the tuning of FM receiver 1 and the volume of the demodulated AF signal produced by electronic volume controller 5.
Controller 4 contains an RDS data processing circuit 40, a central processing unit (CPU) 41, a random access memory (RAM) 42, a random counter 43 and a key processing circuit 44.
Controller 4 sends suitable display data to a display unit 7.
For example, display data may be a band, a frequency, RDS data, a signal strength or a time.
A key matrix 8 is used by an operator to input instructions (key data) to key matrix 8, which supplies the key data to controller 4.
For example, key matrix 8 can be incorporated in a front panel of the RDS receiver to permit user control of the operations of the RDS receiver.
In response to the key data from key matrix 8, controller 4 can apply a tuning control signal to FM receiver 1, change the volume control data applied to electronic volume controller 5, or change the display data shown by display unit 7
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Telecommunications 
