Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1982-07-19
1985-06-04
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455186, 340799, H04B 116
Patent
active
045219141
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a circuit arrangement for indicating the names of broadcasting stations in radio or TV receivers.
2. Description of the Prior Art
In order to tune the receiving oscillator in a radio device, the capacity of a condenser in the frequence determining oscillation range is changed. The condenser is coupled with a scale on which the frequences and/or the broadcasting stations are listed. However, the names of all receiving broadcasting stations cannot be entered on this scale. If only frequency values are listed on this scale, the name of the respective broadcasting stations must be determined by means of a broadcasting station table. The latter is also the case for digital tuning after frequency synthesis.
German Application No. 28 13 727 describes a circuit arrangement with a memory arrangement which contains information corresponding with the names of broadcasting stations with their carrier frequencies. A continuous comparison of all broadcasting frequencies with the currently set receiving frequency takes place. A drawback of this approach is that this comparison requires a certain time, particularly if there is a large number of broadcasting stations in the memory so that the indication cannot take place immediately as the respective frequency on the broadcasting station scale is passed. The described principle is applicable only if the number of broadcasting stations stored of the memory is in an order of magnitude which can be set directly by push buttons. Another drawback is that the complete frequency information for every station name to be stored must be retained in a memory.
SUMMARY OF THE INVENTION
The purpose of this invention is to provide a circuit arrangement for indicating station names in radio or TV receivers which may contain as many station names as desired without incurring a significant time loss in finding and indicating the set station. In particular, the memory expenditure required for retaining the station names should be kept at a lower level.
In accordance with this invention the required expenditure for the automatic station indication is greatly reduced by an addressing system derived from the receiving frequency (and/or the corresponding oscillator frequency) by division and/or addition and/or substraction. By addressing the broadcasting station memory--in the simplest case--directly by the divided set receiving frequency and/or the corresponding oscillator frequency, an automatic indication of the set stations is achieved in the simplest manner.
In an advantageous further development of the invention, the required memory for the broadcasting station names, addressed by data derived from the receiving frequency--compared with the current state of the art--is greatly reduced even if an additional memory is planned which correlates the received frequencies with the addresses in the memory containing the names of the stations.
Compared with known arrangements, it is not necessary to have a complete frequency value in the memory for every received station, but it is only necessary to have information which is sufficient for addressing the memory location containing the station designation. If multiple station or program designations exist, additional memory space can be saved by multiple addressing of the same designation.
Frequency tolerances, for example, can be equalized in an advantageous manner by identical addresses in the memory for the station names being contained in an additional memory for individual adjacent frequencies.
The memory for the station names can thus be structured essentially free of redundancy. Memories with storage locations of various sizes are planned in which in each case station names with the same or similar length are retained, and the names for the various programs of the broadcasting companies which are reflected by station chains must only exist once as "station names" and can be addressed by various frequencies implemented by the additional memory. This arrangement
REFERENCES:
patent: 4122395 (1978-10-01), Schotz et al.
patent: 4228541 (1980-10-01), Snedkerud et al.
patent: 4314375 (1982-02-01), Belisomi
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